Journal articles: 'Anaerobic co-digestion'

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Primasari, Budhi, and Ansiha Nur. "Pengaruh Laju Pembebanan Organik terhadap Reduksi Padatan pada Proses Anaerobic Co-Digestion Sampah Sayuran dengan Lumpur SBR." Dampak 15, no. 2 (July 31, 2018): 88. http://dx.doi.org/10.25077/dampak.15.2.88-92.2018.

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Anaerobic digestion is to treat organic waste such as vegetable solid waste (VSW). Anaerobic co-digestion is the mixture of two or more different waste types with the aim to enhance the efficiency of the anaerobic digestion process. In this study, anaerobic digestion of vegetable solid waste (VSW) is compared to the anaerobic co-digestion of VSW and sequencing batch reactor (SBR) sludge. This investigation is focussed on the varying the organic loading rate (OLR) which is the mixing ratio of VSW to SBR sludge; and pH (6, 7 and 8) of the mixture. The mixtures were kept in serum bottles and placed in a shaker for 7 days at 150 rpm. Experiments with OLR 2:1, VSW composition of 1:2:1:1 and pH 6 produced the highest total biogas in anaerobic co-digestion. Thus, for anaerobic co-digestion, the optimum composition of VSW, OLR and pH are 1:2:1:1, 2:1 and 6 respectively. The range of % reduction in total solids (TS), total suspended solids (TSS) and total dissolve solids (TDS) in anaerobic co-digestion is 4-46, 0-43 and 0-64 respectively. In a comparison with single digestion, only 1 in 5 samples of co-digestion exceed that amount of biogas produced by single digestion and this shows that single anaerobic digestion resulted in higher biogas yield. The range of % reduction in TS, TSS and TDS in anaerobic digestion is 13-54, 15-66 and 9-58 respectively. Comparatively, single digestion performs better in solids removal than anaerobic co-digestion and thus, co-digestion method may not be suitable for all types of organic waste.

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Chow, Wei Ling, Siewhui Chong, Jun Wei Lim, Yi Jing Chan, Mei Fong Chong, Timm Joyce Tiong, Jit Kai Chin, and Guan-Ting Pan. "Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield." Processes 8, no. 1 (January 1, 2020): 39. http://dx.doi.org/10.3390/pr8010039.

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Anaerobic digestion has been widely employed in waste treatment for its ability to capture methane gas released as a product during the digestion. Certain wastes, however, cannot be easily digested due to their low nutrient level insufficient for anaerobic digestion, thus co-digestion is a viable option. Numerous studies have shown that using co-substrates in anaerobic digestion systems improve methane yields as positive synergisms are established in the digestion medium, and the supply of missing nutrients are introduced by the co-substrates. Nevertheless, large-scale implementation of co-digestion technology is limited by inherent process limitations and operational concerns. This review summarizes the results from numerous laboratory, pilot, and full-scale anaerobic co-digestion (ACD) studies of wastewater sludge with the co-substrates of organic fraction of municipal solid waste, food waste, crude glycerol, agricultural waste, and fat, oil and grease. The critical factors that influence the ACD operation are also discussed. The ultimate aim of this review is to identify the best potential co-substrate for wastewater sludge anaerobic co-digestion and provide a recommendation for future reference. By adding co-substrates, a gain ranging from 13 to 176% in the methane yield was accomplished compared to the mono-digestions.

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Aboudi, Kaoutar, Xiomara Gómez-Quiroga, Carlos José Álvarez-Gallego, and Luis Isidoro Romero-García. "Insights into Anaerobic Co-Digestion of Lignocellulosic Biomass (Sugar Beet By-Products) and Animal Manure in Long-Term Semi-Continuous Assays." Applied Sciences 10, no. 15 (July 26, 2020): 5126. http://dx.doi.org/10.3390/app10155126.

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Biogas production through anaerobic digestion has proven to be one of the most important pillars of the transition into the circular economy concept, a sustainable approach for biorefinery. This work aims to extend and improve knowledge in the anaerobic co-digestion of complementary substrates, given insights into wastes biodegradability and the influence of manure composition on the anaerobic process stability. Anaerobic co-digestion of sugar beet by-products with two kinds of animal manure (pig and cow) was investigated in semi-continuous assays, analyzing both common and non-classical parameters. Co-digestion with manure clearly mitigated the inhibitory effect of volatile fatty acids at high organic loading rates, leading to increases in methane production by 70% and 31% in comparison with individual digestion of sugar beet by-products, for co-digestion with pig and cow manure, respectively. Non-classical parameters could give more insight into the coupling/uncoupling of the anaerobic digestion phases and the involved microorganisms. Indirect parameters indicated that the process failure at the critical organic loading rates was mainly due to methanogenesis inhibition in the co-digestion with pig manure, while in co-digestion with cow manure or in individual digestion of sugar beet by-products, both hydrolysis–acidogenesis and methanogenesis phases were affected. Biomethanation degree refers to the maximum methane potential of organic wastes. Sugar beet by-products required a long digestion-time to reach high biodegradability. However, short digestion-times for co-digestion assays led to a high biomethanation degree.

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Cavalcanti, Ingrid Lélis Ricarte, Valderi Duarte Leite, and Roberto Alves de Oliveira. "Bibliometric analysis on the applicability of anaerobic digestion in organic solid waste." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 18 (May 31, 2023): 1–13. http://dx.doi.org/10.4136/ambi-agua.2891.

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Anaerobic biological treatment can comprise a viable route of CH4 production through the energy recovery of organic solid waste (OSW). This work therefore presented a bibliometric analysis of research trends on the theme "Applicability of biological treatment via Anaerobic Digestion in Organic Solid Waste", considering experimental articles published from 2018 to 2022 in the Web of Science database™; the analysis used VoSviewer software to define research trends, and found that the main terms addressed in the mapped scientific articles were anaerobic, waste, sludge, waste food, municipal waste, anaerobic co-digestion, sewage sludge, organic fraction, co-digestion and biogas. As a product of such mapping, an Interaction Network Diagram was constructed comprising the main terms in addition to a theoretical foundation on anaerobic digestion and biochemical and microbiological aspects about the process. Keywords: anaerobic co-digestion, clean energy, food waste, microbial intercropping.

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Rodríguez, L., J. Villaseñor, F. J. Fernández, and I. M. Buendía. "Anaerobic co-digestion of winery wastewater." Water Science and Technology 56, no. 2 (July 1, 2007): 49–54. http://dx.doi.org/10.2166/wst.2007.471.

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The operational performance of anaerobic batch reactors treating winery wastewater (WW) combined with waste activated sludge (WAS) in different proportions was investigated under mesophilic conditions. In these experiments it was shown that for anaerobic digestion of WW alone, methane production rate was lower than the rates achieved when WW and WAS were treated together. When WW was mixed with WAS at a concentration of 50% WW resulted in the highest methane production rates. A simplified anaerobic model was used to determine the main kinetic parameters; maximum COD reduction rate (qDA) and maximum methane generation rate (kmax). The maximum values of qDA and kmax were 16.50 kgCOD COD−1 d−1 and 14.34 kgCOD kgCOD−1 d−1, respectively.

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Esposito, G., L. Frunzo, A. Giordano, F. Liotta, A. Panico, and F. Pirozzi. "Anaerobic co-digestion of organic wastes." Reviews in Environmental Science and Bio/Technology 11, no. 4 (April 5, 2012): 325–41. http://dx.doi.org/10.1007/s11157-012-9277-8.

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Zhao, Ke, Qiang Wei, Mingxuan Bai, and Mengnan Shen. "Study on the Environmental Impact and Benefits of Incorporating Humus Composites in Anaerobic Co-Digestion Treatment." Toxics 12, no. 5 (May 13, 2024): 360. http://dx.doi.org/10.3390/toxics12050360.

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This study evaluated the environmental impact and overall benefits of incorporating humus composites in the anaerobic co-digestion of kitchen waste and residual sludge. The life cycle assessment method was used to quantitatively analyze the environmental impact of the entire anaerobic co-digestion treatment process of waste, including garbage collection, transportation, and final product utilization. Moreover, the comprehensive assessment of the environmental impact, energy-saving and emission-reduction abilities, and economic cost of using humus composites in the anaerobic co-digestion treatment process was conducted using a benefit analysis method. The results showed that the anaerobic co-digestion of kitchen waste and residual sludge significantly contributed to the mitigation of global warming potential (GWP), reaching −19.76 kgCO2-eq, but had the least impact on the mitigation of acidification potential (AP), reaching −0.10 kgSO2-eq. In addition, the addition of humus composites significantly increased the production of biogas. At a concentration of 5 g/L, the biogas yield of the anaerobic co-digestion process was 70.76 m3, which increased by 50.62% compared with the blank group. This amount of biogas replaces ~50.52 kg of standard coal, reducing CO2 emissions by 13.74 kg compared with burning the same amount of standard coal. Therefore, the anaerobic co-digestion treatment of kitchen waste and residual sludge brings considerable environmental benefits.

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Darwin, Novi Diana, Mardhotillah, and Atmadian Pratama. "Anaerobic Co-Digestion of Cow Manure and Palm Oil Mill Effluent (POME): Assessment of Methane Production and Biodegradation Efficiency." International Journal of Design & Nature and Ecodynamics 16, no. 6 (December 21, 2021): 671–76. http://dx.doi.org/10.18280/ijdne.160608.

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The performance of anaerobic co-digestion of cow manure and POME was evaluated. The anaerobic composting process was carried out by using semi-continuous reactors under the mesophilic condition (35 ± 1℃). The addition of POME to the on-going anaerobic composting of cow manure was applied stepwise within a cycle of HRT (20 days). Results showed that the anaerobic co-digestion reactor could produce methane at about six times higher (7.2 L CH4) than the control reactor (1.3 L CH4). An increasing of POME loaded to the on-going anaerobic composting cow manure culture (4% to 64%) did not affect pH of the culture in which pH was still stable between 7.11 and 7.5. Assessment of biodegradation efficiency revealed that nitrogen removal of the anaerobic co-digestion reactor was six times higher (21%) than the nitrogen removal of the control reactor (3.4%). This suggested that the anaerobic co-digestion reactor performed sufficiently well in which no organic acid as well as ammonia accumulated in the reactor that could be effective to decompose the organic matters.

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Navaneethan, N., P. Topczewski, S. Royer, and D. Zitomer. "Blending anaerobic co-digestates: synergism and economics." Water Science and Technology 63, no. 12 (June 1, 2011): 2916–22. http://dx.doi.org/10.2166/wst.2011.557.

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Co-digestion is the process in which wastes from various sources are treated together. Therefore, more organic carbon is added to make efficient use of existing digesters. The objectives of this study were to compare potential co-digestates, determine synergistic and antagonistic co-digestion outcomes and estimate economic benefits for preliminary screening. Over 80 wastes were identified from 54 facilities within 160 km of an existing municipal digester. Synergistic, antagonistic and neutral co-digestion outcomes were observed for the various wastes. A simple economic comparison resulted in the greatest potential benefits for four co-digestates: yeast flavorings production waste, meat production dissolved air flotation float, acid whey from cheese production and thin stillage from corn ethanol production. Performance was investigated using bench-scale digesters receiving primary sludge with and without co-digestates. Methane production rates were 105 and 66% higher when co-digestates were present, but were anticipated to increase only 57 and 23% due to the additional chemical oxygen demand. Therefore, significant synergistic outcomes were observed during co-digestion. Co-digestion of the most promising wastes with primary sludge in full scale was estimated to generate enough electricity to power more than 2,500 houses.

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Olatunji, Kehinde O., and Daniel M. Madyira. "Anaerobic co-digestion of alkali-pretreated groundnut shells and duck waste for methane yield optimization and sustainable environment." E3S Web of Conferences 433 (2023): 02005. http://dx.doi.org/10.1051/e3sconf/202343302005.

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This study investigated the effect of the anaerobic co-digestion of duck waste and alkali-pretreated groundnut shells at mesophilic temperature for methane yield optimization and waste management. Co-digestion of duck waste and alkali-pretreated groundnut shells was carried out using 100, 75: 25, 50: 50, 25: 75, and 100% duck waste: alkali-pretreated groundnut shells in a laboratory-batch digester at mesophilic temperature. The results indicated that anaerobic co-digestion of duck waste and alkali-pretreated groundnut shells is possible since no negative influence was observed during the joint digestion. It was observed that co-digestion released higher methane yield compared to mono-digestion. The optimum cumulative methane yield of 290 mL CH4 g/ VSadded was recorded from a 75: 25% ratio of duck waste: alkali-pretreated groundnut shells. This mixing ratio improved methane yield by 38%. This study confirms that the anaerobic co-digestion of duck waste and alkalipretreated groundnut shells can produce low-carbon fuel and economical waste management to maintain a sustainable environment.

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Mohammadi, Soufia, Pilar Monsalvete Álvarez de Uribarri, and Ursula Eicker. "Decentral Energy Generation Potential of Anaerobic Digestion of Black Water and Kitchen Refuse for Eco-District Planning." Energies 14, no. 10 (May 19, 2021): 2948. http://dx.doi.org/10.3390/en14102948.

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Biogas technology is an important alternative energy source worldwide. Blackwater and kitchen refuse represent ideal waste streams for bioenergy recovery through anaerobic co-digestion. Modeling of the biokinetics of anaerobic digestion on several aspects, such as microbial activity, substrate degradation, and methane production, from co-digestion of black water (BW) and kitchen refuse (KR) was the objective of this research. A mathematical model was developed towards a simulation based on mass balances on biomass, the organic substrate, and biogas. The model was implemented in INSEL and experimental data from the literature were used for model validation. The study shows that the simulation results fit well with the experimental data. The energy consumption and generation potential of anaerobic co-digestion of BW and KR were calculated to investigate if the produced biogas could supply the digester’s energy demand. This study can be used to pre-design anaerobic digestion systems in eco-districts.

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Tran, Son Minh. "LAB-SCALE STUDY ON CO-DIGESTION OF KITCHEN WASTE, SLUDGE AND SEWAGE." Vietnam Journal of Science and Technology 54, no. 2A (March 19, 2018): 231. http://dx.doi.org/10.15625/2525-2518/54/2a/11935.

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Anaerobic digestion is widely used for biodegradable solid organic wastes in order to recover bio-energy in the form of biogas. Some previous studies presented that co-digestion of various substrates can improve biogas yields as well as enhanceperformance of organic wastes digestion, in comparison with digestion of sole solid waste. This study aimed to evaluate the performance of anaerobic mono-digestion and anaerobic co-digestion of the following mixtures: (a) sole kitchen waste (KW), (b) KW and sewage (SW), (c) sole sludge (SL)and (d) KW and SL. This study was conductedby four lab-scale anaerobic complete mixing reactors (numbered MH1 – MH4) in 4,5 liters working volume atorganic loading rate (OLR) 2,0 g(VS).L-1.d-1. The KW was collected from canteen B4 and SW was collected from effluent from septic tank C6 Building in Ho Chi Minh University of Technology (HCMUT). The results show that the reactor of sole KW obtained average total chemical oxygen demand (tCOD), soluble chemical oxygen demand (sCOD), total solid (TS), volatile solid (VS), total phosphorus (TP) and total Kjeldahl nitrogen (TKN) of 62 %, 62 %, 71 %, 72 %, 73 % and 45 %, respectively, whereas reactor of KW and SW co-digestion had were tCOD, sCOD, TS, VS, TP and TKN removal of 73 %, 78 %, 75 %, 79 %, 59 % and 57 %, respectively. Thus co-digestion of KW and SW revealed an efficient enhancement of digestion, instead of sole KW digestion. Similarly, TS (74 %) and VS removals (75 %) of co-digesting mixtures of SL and KW were higher than those of sole SL digestion (67 %). Furthermore, co-digestion of SL and KW obtained better performance in tCOD and sCOD removals (70 % and 76 %, respectively).

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Li, Renfei, Wenbing Tan, Xinyu Zhao, Qiuling Dang, Qidao Song, Beidou Xi, and Xiaohui Zhang. "Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure." Catalysts 9, no. 6 (June 17, 2019): 539. http://dx.doi.org/10.3390/catal9060539.

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Wood waste generated during the tree felling and processing is a rich, green, and renewable lignocellulosic biomass. However, an effective method to apply wood waste in anaerobic digestion is lacking. The high carbon to nitrogen (C/N) ratio and rich lignin content of wood waste are the major limiting factors for high biogas production. NaOH pre-treatment for lignocellulosic biomass is a promising approach to weaken the adverse effect of complex crystalline cellulosic structure on biogas production in anaerobic digestion, and the synergistic integration of lignocellulosic biomass with low C/N ratio biomass in anaerobic digestion is a logical option to balance the excessive C/N ratio. Here, we assessed the improvement of methane production of wood waste in anaerobic digestion by NaOH pretreatment, co-digestion technique, and their combination. The results showed that the methane yield of the single digestion of wood waste was increased by 38.5% after NaOH pretreatment compared with the untreated wood waste. The methane production of the co-digestion of wood waste and pig manure was higher than that of the single digestion of wood waste and had nonsignificant difference with the single-digestion of pig manure. The methane yield of the co-digestion of wood waste pretreated with NaOH and pig manure was increased by 75.8% than that of the untreated wood waste. The findings indicated that wood waste as a sustainable biomass source has considerable potential to achieve high biogas production in anaerobic digestion.

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Damtie, Mekdimu Mezemir, Jingyeong Shin, Hyun Min Jang, and Young Mo Kim. "Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion." Energies 13, no. 17 (September 2, 2020): 4547. http://dx.doi.org/10.3390/en13174547.

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A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 °C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 °C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 °C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.

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Vallini, G., F. Cecchi, P. Pavan, A. Pera, J. Mata-Alvarez, and A. Bassettit. "Recovery and Disposal of the Organic Fraction of Municipal Solid Waste (MSW) by Means of Combined Anaerobic and Aerobic Bio-Treatments." Water Science and Technology 27, no. 2 (January 1, 1993): 121–32. http://dx.doi.org/10.2166/wst.1993.0089.

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The paper deals with the semi-dry anaerobic digestion of municipal solid waste followed by composting as finishing treatment of the digested sludge. The integration of the anaerobic and aerobic treatments was studied as approach to close the water balance of the semi-dry anaerobic digestion process and to remove the phytotoxicity of the digested effluent. This study evaluated the response of the anaerobic effluent to the co-composting post-processing step, whether the anaerobic sludge came from mesophilic semi-dry digestion or thermophilic semi-dry nethanization. Evaluation of the strategy adopted was carried out in terms of performance of aerobic stabilization and its incidence on the economy of the overall treatment and the water balance of the process. Co-composting gave best results when integrated with thermophilic digestion.

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Jeung, Jae Hoon, Woo Jin Chung, and Soon Woong Chang. "Evaluation of Anaerobic Co-Digestion to Enhance the Efficiency of Livestock Manure Anaerobic Digestion." Sustainability 11, no. 24 (December 14, 2019): 7170. http://dx.doi.org/10.3390/su11247170.

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In this paper, the anaerobic co-digestion of three different organic wastes, including livestock manure, slaughterhouse waste, and agricultural by-products (ABs), was carried out to enhance the efficiency of mono-digestion of livestock manure. The characteristics of co-digestion were evaluated at different mixing ratios. The experiment was performed using the Batch test and was divided into two parts. The first experimental section (EXP. 1) was designed to evaluate the seasonal characteristics of ABs, which are the different ratios of fruits and vegetables, where the mixing ratio of spring (fruits:vegetables = 3:7) showed the highest biogas yield (0.24 m3/kg volatile solids). The second experiment (EXP. 2) was conducted by using ABs in the ratio that gave the highest biogas yield in EXP. 1 in combinations of three wastes livestock manure, slaughterhouse waste, and ABs. The highest CH4 yield was 0.84 m3/kg volatile solids (VS), which was obtained with a mixing ratio that had even amounts of the three feedstocks. In addition, the results of the second biochemical methane potential test, which assessed the digestive efficiency according to the mixing ratio of the three types of organic waste, showed that the CH4 production rate of the merged digestion was approximately 1.03–1.29 times higher than that of the mono-digestion of livestock manure. The results of our experiment were verified using the modified Gompertz model, the results of which were relatively similar to the experimental results.

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Volpi, Maria Paula C., Larissa O. Magalhães, Flávia V. Winck, Mônica T. V. Labate, and Bruna S. Moraes. "Metaproteomic Analysis of the Anaerobic Community Involved in the Co-Digestion of Residues from Sugarcane Ethanol Production for Biogas Generation." Biomass 2, no. 4 (December 5, 2022): 358–73. http://dx.doi.org/10.3390/biomass2040024.

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The proteomics analysis could contribute to better understand about metabolic pathways in anaerobic digestion community because it still as a “black-box” process. This study aimed to analyze the proteins of the anaerobic co-digestion performed in reactors containing residues from the first and second generation ethanol production. Metaproteomics analysis was carried out for three types of samples: anaerobic sludge without substrate (SI), semi-continuous stirred reactor (s-CSTR) with co-digestion of filter cake, vinasse, and deacetylation liquor (R-CoAD) and s-CSTR with co-digestion of these aforementioned residues adding Fe3O4 nanoparticles (R-NP). The R-CoAD reactor achieved 234 NmLCH4 gVS−1 and 65% of CH4 in the biogas, while the R-NP reactor reached 2800 NmLCH4 gVS−1 and 80% of CH4. The main proteins found were enolase, xylose isomerase, pyruvate phosphate dikinase, with different proportion in each sample, indicating some change in pathways. However, according to those identified proteins, the main metabolic routes involved in the co-digestion was the syntrophic acetate oxidation coupled with hydrogenotrophic methanogenesis, with the CH4 production occurring preferentially via CO2 reduction. These findings contributed to unravel the anaerobic co-digestion at a micromolecular level, and may select a more appropriate inoculum for biogas production according to that residue, reducing reaction time and increasing productivity.

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Kumar, B. Prasanna, Dr S. Triveni, and Dr A. Vijaya Gopal. "A Comparative Study on Anaerobic Co-Digestion of Agricultural and Horticultural Waste." International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (April 30, 2018): 2685–97. http://dx.doi.org/10.31142/ijtsrd12755.

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Hadiyarto, Agus, Dyah Ayu Pratiwi, and Aldila Ayu Prida Septiyani. "Anaerobic Co-Digestion of Human Excreta and Corn Stalk for Biogas Production." Reaktor 19, no. 4 (December 31, 2019): 137–44. http://dx.doi.org/10.14710/reaktor.19.4.137-144.

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The anaerobic decomposition process of human feces substrate with a C/N ratio of 14.6 has failed to produce biogas optimally. In order to produce biogas maximally, the C/N ratio in the substrate should be in the range of 20-30. In this study, a combination of human feces substrate (C / N = 14.6) with corn stalk waste (C / N = 66.5) was carried out. Corn stalks were soaked first in a NaOH solution to separate lignin before being mixed with human feces. In this study the effect of the C/N ratio from the combination of feces and corn stalks as well as the effect of the type of activated sludge on the rate of biogas production were evaluated. The C/N ratios were varied at 20, 25, and 30 with F/M of 0.5. As the source of microbes is the activated sludge of human feces. A further experiment was carried out by varying the types of microbes where sludge from cow's rumen, activated sludge from feces, and activated sludge from rotten corn stalk was employed at a C/N ratio of 30 and F/M of 0.5. The results of this study showed that the optimal biogas production was obtained at a C/N ratio of 30 with a cumulative gas volume of 13.185 ml for 60 days. The type of microbes that produce maximum biogas production was the activated sludge from the rumen. The optimum biogas yield was obtained at 4.184 liters/kg COD, which was achieved in the stationary phase with a C/N ratio of 30.Keywords: anaerobic co-digestion; biogas; corn stalk; human feces

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Sbarciog, Mihaela, Satyajeet Bhonsale, Viviane De Buck, Simen Akkermans, Monika Polanska, and Jan Van Impe. "Modelling and Simulation of Co-digestion in Anaerobic Digestion Systems." IFAC-PapersOnLine 55, no. 20 (2022): 403–8. http://dx.doi.org/10.1016/j.ifacol.2022.09.128.

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Solé-Bundó, Maria, Fabiana Passos, Maycoll S. Romero-Güiza, Ivet Ferrer, and Sergi Astals. "Co-digestion strategies to enhance microalgae anaerobic digestion: A review." Renewable and Sustainable Energy Reviews 112 (September 2019): 471–82. http://dx.doi.org/10.1016/j.rser.2019.05.036.

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Lu, Wenxu, Guanyong Deng, Xiaoge Cheng, and Wan Wang. "Effects of Iron-Loaded Biochar on the Anaerobic Co-Digestion of Food Waste and Sewage Sludge and Elucidating the Mechanism Thereof." Sustainability 14, no. 15 (August 1, 2022): 9442. http://dx.doi.org/10.3390/su14159442.

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The inhibition of volatile fatty acid (VFA) production is an important factor affecting biogas (methane) production in the anaerobic co-digestion systems comprising food waste and sewage sludge. In this study, batch experiments were conducted at medium temperature (36 ± 0.5 °C), during which the biogas production index and material–liquid characteristic parameters of the anaerobic digestion systems containing different concentrations of iron-loaded biochar (Fe-BC) were monitored. The cumulative biogas production data were analyzed using a modified Gompertz kinetic model to determine the effect of the Fe-BC on biogas production in the anaerobic co-digestion system. Studies have shown that addition of Fe-BC does not significantly influence the hydrolysis and acidification stages of anaerobic co-digestion, but does have a significant effect on promoting methanogenesis by alleviating the accumulation of VFAs and improving both the buffer capacity of the system and the efficiency of substrate-to-biogas conversion. When the Fe-BC concentration was 16 g·L−1, the cumulative biogas production reached 329.42 mL·g-VS−1, which was 49.7% higher than the blank group, and the lag period was 3.55 d, which was 42% shorter than the blank group. Mechanistic studies have shown that Fe-BC increased the concentration of coenzyme F420 and the conductivity of the digestate in the co-digestion system, which increased the activity of methanogens in the anaerobic digestion system, thereby promoting methanogenesis.

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Liu, Pengcheng, and Yunxia Pan. "The Improvement of Rice Straw Anaerobic Co-Digestion with Swine Wastewater by Solar/Fe(II)/PS Pretreatment." Sustainability 15, no. 8 (April 15, 2023): 6707. http://dx.doi.org/10.3390/su15086707.

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Rice straw (RS) is among the agricultural waste products with the highest methane production potential in the world, but the refractory complex structure and high carbon-to-nitrogen ratio of RS cause low methane conversion efficiency and limit its widespread application in anaerobic digestion. In this study, Solar/Fe (II)/persulfate (PS) pretreatment of RS was investigated to improve microbial accessibility, and anaerobic co-digestion combined pretreated RS and swine wastewater (SW) were evaluated to improve the efficiency of anaerobic digestion. The results showed that the Solar/Fe (II)/PS pretreatment could disrupt the structure of RS and promote the reduction of sugar content, increasing microbial accessibility to RS. When all the components of the pretreated RS (including the use of the solution remaining from the pretreatment) were anaerobically co-digested with SW, the cumulative biogas production and cumulative methane production reached 252.10 mL/g·VS and 163.71 mL/g·VS, 19.18% and 36.97% higher than the anaerobic co-digestion of untreated RS and SW, respectively. The anaerobic co-digestion of the Solar/Fe (II)/PS-pretreated RS with SW is a promising approach to achieving the utilization of RS components and maximizing methane yields, providing a cost-effective and pollution-free method for the production of high-quality bioenergy from agricultural waste.

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Song, Xiao, Meng Han, Qing Feng Gao, Guo Qing Yang, Yi Qi, Gang Teng, Feng Chao Yin, and Lei Zhang. "Control Strategies for Enhancement of Anaerobic Digestion of Food Waste." Advanced Materials Research 1092-1093 (March 2015): 814–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.814.

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Food waste management has become an important issue from the environmental, economic, and social points of view due to the fast increase of food waste production and serious environmental pollution. Food waste is considered to be an attractive feedstock of anaerobic digestion and has attracted worldwide attention because of its good biodegradability and high methane production potential. However, in practice, anaerobic digestion system of food waste often shows poor performance and stability, which greatly limited the development of anaerobic digestion process of food waste. In order to obtain high treatment efficiency and satisfactory methane yield, many researchers employed various control strategies for anaerobic digestion of food waste including pretreatment, additive agent addition, two-phase anaerobic digestion, and anaerobic co-digestion. Therefore, this article is intended to review the control strategies for anaerobic digestion process that have been developed for methane production from food waste.

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Karki, Renisha, Wachiranon Chuenchart, K. C. Surendra, Shilva Shrestha, Lutgarde Raskin, Shihwu Sung, Andrew Hashimoto, and Samir Kumar Khanal. "Anaerobic co-digestion: Current status and perspectives." Bioresource Technology 330 (June 2021): 125001. http://dx.doi.org/10.1016/j.biortech.2021.125001.

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Navaratnam, Navaneethan, Peter Topczewski, Scott Royer, and Daniel H. Zitomer. "Anaerobic Co-Digestion for Increased Renewable Energy." Proceedings of the Water Environment Federation 2010, no. 14 (January 1, 2010): 2723–37. http://dx.doi.org/10.2175/193864710798171044.

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Wang, Ling, Tarek N. Aziz, Joel Ducoste, and Francis L. de los Reyes. "Anaerobic Co-Digestion of Grease Trap Waste." Proceedings of the Water Environment Federation 2012, no. 10 (January 1, 2012): 5428–34. http://dx.doi.org/10.2175/193864712811709661.

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Brown, Nicola, Johanna Güttler, and Andy Shilton. "Probiotic effects of anaerobic co-digestion substrates." Environmental Technology 40, no. 18 (March 1, 2018): 2455–59. http://dx.doi.org/10.1080/09593330.2018.1444097.

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Ghaleb, Aiban Abdulhakim Saeed, Shamsul Rahman Mohamed Kutty, Yeek-Chia Ho, Ahmad Hussaini Jagaba, Azmatullah Noor, Abdulnaser Mohammed Al-Sabaeei, and Najib Mohammed Yahya Almahbashi. "Response Surface Methodology to Optimize Methane Production from Mesophilic Anaerobic Co-Digestion of Oily-Biological Sludge and Sugarcane Bagasse." Sustainability 12, no. 5 (March 9, 2020): 2116. http://dx.doi.org/10.3390/su12052116.

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Oily-biological sludge (OBS) generated from petroleum refineries has high toxicity. Therefore, it needs an appropriate disposal method to reduce the negative impacts on the environment. The anaerobic co-digestion process is an effective method that manages and converts organic waste to energy. For effective anaerobic digestion, a co-substrate would be required to provide a suitable environment for anaerobic bacteria. In oily-biological sludge, the carbon/nitrogen (C/N) ratio and volatile solids (VS) content are very low. Therefore, it needs to be digested with organic waste that has a high C/N ratio and high VS content. This study investigates the use of sugarcane bagasse (SB) as an effective co-substrate due to its high C/N ratio and high VS content to improve the anaerobic co-digestion process with oily-biological sludge. The sugarcane bagasse also helps to delay the toxicity effect of the methane bacteria. Batch anaerobic co-digestion of oily-biological sludge was conducted with sugarcane bagasse as a co-substrate in twelve reactors with two-liter capacity, each under mesophilic conditions. The interaction effect of a C/N ratio of 20-30 and a VS co-substrate/VS inoculum ratio of 0.06-0.18 on the methane yield (mL CH4/g VSremoved) was investigated. Before the anaerobic digestion, thermochemical pre-treatment of the inoculum and co-substrate was conducted using sodium hydroxide to balance their acidic nature and provide a suitable pH environment for methane bacteria. Design and optimization for the mixing ratios were carried out by central composite design-response surface methodology (CCD-RSM). The highest predicted methane yield was found to be 63.52 mL CH4/g VSremoved, under optimum conditions (C/N ratio of 30 and co-substrate/inoculum ratio of 0.18).

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Glanpracha, Naraporn, B. M. N. Basnayake, Eldon R. Rene, Piet N. L. Lens, and Ajit P. Annachhatre. "Cyanide degradation kinetics during anaerobic co-digestion of cassava pulp with pig manure." Water Science and Technology 2017, no. 3 (May 10, 2018): 650–60. http://dx.doi.org/10.2166/wst.2018.210.

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Abstract Anaerobic co-digestion of cassava pulp (CP) and pig manure (PM) under cyanide inhibition conditions was investigated and modeled. Batch experiments were performed with initial cyanide concentrations ranging from 1.5 to 10 mg/L. Cyanide acclimatized sludge from an anaerobic co-digester treating cyanide-containing CP and PM was used as the seed sludge (inoculum). Cyanide degradation during anaerobic digestion consisted of an initial lag phase, followed by a cyanide degradation phase. After a short sludge acclimatization period of less than 3 days, the anaerobic sludge was able to degrade cyanide, indicating that the sludge inhibition due to cyanide was reversible. Cyanide degradation during anaerobic co-digestion of CP and PM followed the first-order kinetics with a rate constant of 0.094 d−1. Gas evolution during batch anaerobic degradation was modeled using the modified Monod-type kinetics to incorporate cyanide inhibition. The model predicted results yielded a satisfactory fit with the experimental data.

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V. S, Patil, Patil S.V., and Bhide A.J. "Anaerobic Co-Digestion of Vegetable Waste with Cattle Dung and Fruit Waste for Biogas Generation." Environment and Ecology 41, no. 4D (December 2023): 3082–86. http://dx.doi.org/10.60151/envec/rviu6774.

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India is a developing country and its rate of energy consumption is increasing with economic and industrial development. Most of the countries are dependent on non-renewable energy sources that have many limitations and demerits. The use of renewable energy resources is beneficial from socioeconomic and ecological point of view that can help to achieve sustainable development goals. India is agro-based country and produces huge quantities of organic waste per day. The disposal of these wastes by unscientific treatment methods causes serious environmental pollution. Anaerobic digestion and co-digestion are considered as ecofriendly technology of energy generation and waste disposal. The co-digestion is more beneficial over anaerobic digestion and has several advantages. The present work was undertaken to study anaerobic co-digestion of vegetable waste with cattle dung and fruit waste with the objectives of treating the waste to generate biogas and to decrease its environmental pollution potential.

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V. S., Patil, Patil S.V., and Bhide A.J. "Anaerobic Co-Digestion of Vegetable Waste with Cattle Dung and Fruit Waste for Biogas Generation." Environment and Ecology 42, no. 1 (January 2024): 6–10. http://dx.doi.org/10.60151/envec/xezd2082.

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India is a developing country and its rate of energy consumption is increasing with economic and industrial development. Most of the countries are dependent on non-renewable energy sources that have many limitations and demerits. The use of renewable energy resources is beneficial from socioeconomic and ecological point of view that can help to achieve sustainable development goals. India is agro-based country and produces huge quantities of organic waste per day. The disposal of these wastes by unscientific treatment methods causes serious environmental pollution. Anaerobic digestion and co-digestion are considered as ecofriendly technology of energy generation and waste disposal. The co-digestion is more beneficial over anaerobic digestion and has several advantages. The present work was undertaken to study anaerobic co-digestion of vegetable waste with cattle dung and fruit waste with the objectives of treating the waste to generate biogas and to decrease its environmental pollution potential.

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Mudzanani, Khuthadzo E., Terence T. Phadi, Sunny E. Iyuke, and Michael O. Daramola. "Enhancing Methane Production through Anaerobic Co-Digestion of Sewage Sludge: A Modified ADM1 Model Approach." Fermentation 9, no. 9 (September 13, 2023): 833. http://dx.doi.org/10.3390/fermentation9090833.

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The International Water Association’s (IWA) established Anaerobic Digestion Model No. 1 (ADM1) was created to serve as a backup for experimental findings regarding the actual anaerobic digestion process. The previous model idea was adjusted and used to simulate an anaerobic digestion process in this study. Testing procedures, such as benchmark tests and balance checks, were performed in order to verify the accuracy of the implementation. These measures worked in tandem to ensure that the model was implemented flawlessly and without inconsistencies. The primary objective of this article is to construct a method that is based on the ADM1 for evaluating co-digestion and predicting the performance of the digestion process or methane yield based on the analyzed substrates’ physicochemical properties. Additional equations and simulations have been added to the standard model to create tools for evaluating the feasibility of anaerobic co-digestion. The study’s two most intriguing aspects are the optimal mixture and parameter dependence. The adjusted ADM1 is accurate in predicting the measured values of effluent COD, pH, methane, and produced biogas flows with a reasonable degree of accuracy, according to the validation results. This research shows how to use ADM1 in a wastewater treatment plant and other settings where anaerobic digestion is of interest.

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Albini, Elena, Isabella Pecorini, and Giovanni Ferrara. "Improvement of Digestate Stability Using Dark Fermentation and Anaerobic Digestion Processes." Energies 12, no. 18 (September 17, 2019): 3552. http://dx.doi.org/10.3390/en12183552.

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This paper assessed the effect of dark fermentation, the fermentative phase in a two-stage anaerobic digestion system, in terms of digestate biostabilization efficiency. The digestates analyzed in this study were obtained from a pilot-scale system in which two different substrates were used in order to simulate both the digestion and co-digestion process. Biostabilization performances were evaluated by measuring the specific oxygen uptake rate (SOUR) of the outgoing digestates. This index allowed us to define the degree of effectiveness in terms of stabilization of organic matter, between the traditional anaerobic digestion process and the two-stage configuration. Considering the traditional process as a reference scenario, the results highlighted an increase in biological stability for the two-stage co-digestion process, consisting of a dark fermentation stage, followed by an anaerobic digestion one. Digestates biostabilization efficiency increased up from 6.5% to 40.6% from the traditional one-stage configuration to the two-stage one by improving the anaerobic digestion process through a preliminary fermentative stage. The advantages of the two-stage process were due to the role of dark fermentation as a biological pre-treatment. Considering the partial stability results related to the second stage, biological stability was improved in comparison to a single-stage process, reaching an efficiency of 42.2% and 55.8% for the digestion and co-digestion scenario respectively. The dark fermentation phase allowed for a higher hydrolysis of the substrate, making it more easily degradable in the second phase. Results demonstrated better biostabilization performances of the outgoing digestates with the introduction of dark fermentation, resulting in more stable digestates for both the digestion and co-digestion process.

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Li, Xiaojue, and Naoto Shimizu. "Effects of Lipase Addition, Hydrothermal Processing, Their Combination, and Co-Digestion with Crude Glycerol on Food Waste Anaerobic Digestion." Fermentation 7, no. 4 (November 27, 2021): 284. http://dx.doi.org/10.3390/fermentation7040284.

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To enhance anaerobic fermentation during food waste (FW) digestion, pretreatments can be applied or the FW can be co-digested with other waste. In this study, lipase addition (LA), hydrothermal pretreatment (HTP), and a combination of both methods (HL) were applied to hydrolyze organic matter in FW. Furthermore, the effects of crude glycerol (CG), which provided 5%, 10%, and 15% of the volatile solids (VS) as co-substrate (denoted as CG5, CG10, and CG15, respectively), on the anaerobic digestion of FW were assessed. With an increasing proportion of CG in the co-digestion experiment, CG10 showed higher methane production, while CG15 negatively affected the anaerobic digestion (AD) performance owing to propionic acid accumulation acidifying the reactors and inhibiting methanogen growth. As the pretreatments partially decomposed hard-to-degrade substances in advance, pretreated FW showed a stronger methane production ability compared with raw FW, especially using the HL method, which was significantly better than co-digestion. HL pretreatment was shown to be a promising option for enhancing the methane potential value (1.773 NL CH4/g VS) according to the modified Gompertz model.

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Morales-Polo, Carlos, María del Mar Cledera-Castro, and B. Yolanda Moratilla Soria. "Reviewing the Anaerobic Digestion of Food Waste: From Waste Generation and Anaerobic Process to Its Perspectives." Applied Sciences 8, no. 10 (October 2, 2018): 1804. http://dx.doi.org/10.3390/app8101804.

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Discharge of waste in general, and food waste, in particular, is considered one of the major environmental problems today, as waste generation increases continuously, reaching values of 32% of all food produced worldwide. There are many different options that can be applied to the management and evaluation of waste treatment, and Anaerobic Digestion seems to be one of the most suitable solutions because of its benefits, including renewable energy generation in form of biogas. Moreover, if FW (food waste) is digested in anaerobic digesters from Waste Water Treatment Plants, a common solution is provided for both residues. Furthermore, co-digestion of food waste and sewage sludge provides benefits in terms of anaerobic process stability enhancing the buffer capacity of ammonia (for example) and biogas formation, which can be increased up to 80% when compared with monodigestion. The present paper reviews food waste anaerobic digestion from its generation, characteristics and different options for its management, and it does focus specifically on the anaerobic digestion and co-digestion process, stages, limiting rates and parameters, utilizing numerous experiences, strictly related to food waste. Pre-treatments are also considered as they are important and innovative for enhancing biogas production and its methane yield. The paper shows an extensive collection of pre-treatments, its basics, improving factors, and numerical data of biogas formation improvements that are related both to substrate modification and to the synergistic effect of co-digestion, which could lead to an increase of methane production from 11% to 180%.

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Kim, H. W., S. K. Han, and H. S. Shin. "Anaerobic co-digestion of sewage sludge and food waste using temperature-phased anaerobic digestion process." Water Science and Technology 50, no. 9 (November 1, 2004): 107–14. http://dx.doi.org/10.2166/wst.2004.0547.

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This study was performed to overcome the low efficiency of anaerobic digestion of sewage sludge and food waste by combining temperature-phased digestion, sequencing batch operation, and co-digestion technology. It was demonstrated that the temperature-phased anaerobic sequencing batch reactor (TPASBR) system for the co-digestion of sewage sludge and food waste resulted in enhanced volatile solids (VS) reduction and methane production rate. At the organic loading rate (OLR) of 2.7 g VS/l/d, the TPASBR system showed the higher VS reduction (61.3%), CH4 yield (0.28 l/g VSadded) and CH4 production rate (0.41 l CH4/l/d) than those (0.29 l CH4/l/d) of the mesophilic two-stage ASBR (MTSASBR). In the specific methanogenic activity (SMA) tests on thermophilic biomass of the TPASBR system, the average SMA of acetate (93 ml CH4/gVSS/d) was much higher than those of propionate (46 ml CH4/g VSS/d) and butyrate (76 ml CH4/g VSS/d). Also, higher specific hydrolytic activity (SHA, 217 mg COD/g VSS/d) of the biomass supported fast hydrolysis under thermophilic conditions. The track study revealed that the most active period of the 24 h cycle was between 6 and 12 h. The enhanced performance of the TPASBR system could be attributed to longer solids retention time, fast hydrolysis, higher CH4 conversion rate, and balanced nutrient condition of co-substrate. It was verified that this combination could be a promising and practical alternative for the simultaneous recycling of two types of organic fraction of municipal solid waste (OFMSW) with high stability.

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Orhorhoro, Ejiroghene Kelly. "The Study of Anaerobic Co-Digestion of Non-Uniform Multiple Feed Stock Availability and Composition in Nigeria." European Journal of Engineering and Technology Research 1, no. 1 (July 27, 2018): 39–42. http://dx.doi.org/10.24018/ejeng.2016.1.1.38.

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This paper reports the research work carried out on the study of anaerobic co-digestion of non-uniform multiple feed stock availability and composition in Nigeria. Organic municipal solid wastes comprises of the composition of corn cobs, potato peels, pineapple peels, rice waste, yam peels, cassava peels, orange peels, garri leftover and banana peels, was digested separately and the same time co-digested with wastewater collected from septic tanks, abattoir, and cold room in Benin City, Nigeria. The results obtained shows that the co-digestion of organic municipal solid wastes and wastewater had better average biogas yields (0.625), shorter retention period of 29 days, frequent number of evacuation and average rate of biogas yield of 0.0217 when compared to anaerobic digestion of organic municipal solid wastes only with an average biogas yield of 0.4025, longer retention period of 38 days and average rate of biogas yield of 0.0106. Therefore, anaerobic co-digestion of organic municipal solid wastes and wastewater enhances better biogas yields.

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Ismail, Zainab Ziad, and Nazik Adnan Noori. "Anaerobic Co-digestion of Giant Reed for Biogas Recovery." Journal of Engineering 24, no. 3 (March 1, 2018): 68. http://dx.doi.org/10.31026/j.eng.2018.03.06.

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This study investigated the feasibility of anaerobic co-digestion of giant reed (GR) inoculated with waste manure as a co-substrate for biogas production. The performance of co-digestion was evaluated in 4 anaerobic digesters operated in batch mode at different conditions. The effects of alkali pretreatment with NaOH (4% w/v) solution, inoculum type, and thermal condition were studied. The results demonstrated that the alkali-pretreatment of GR enhanced the biogas generation by about 15% at mesophilic conditions. Thermophilic conditions enhanced the biogas recovery from both alkali-free and alkali pretreated GR by 15% and 127%, respectively. The kinetic study of the co-digestion process of GR for biogas recovery suggested a significant agreement between measured and predicted values obtained by Modified Gompertz Model with correlation coefficients ≥ 0.98 indicating favorable conditions for the co-digestion of inoculated GR.

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Ibro, Mohammed Kelif, Venkata Ramayya Ancha, and Dejene Beyene Lemma. "Impacts of Anaerobic Co-Digestion on Different Influencing Parameters: A Critical Review." Sustainability 14, no. 15 (July 31, 2022): 9387. http://dx.doi.org/10.3390/su14159387.

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Lignocellulosic feedstocks are year-round, available bio-residues that are the right candidates for counteracting the energy crises and global warming facing the world today. However, lignin leads to a slow hydrolysis rate and is a major bottleneck for biogas production via anaerobic digestion. Anaerobic co-digestion (AcoD) is an economical method available, which overcomes the limitation of a single feedstock’s properties in an anaerobic digestion process. This paper critically reviews the impacts of co-digestion on lignocellulosic biomass degradation, process stability, various working parameters, and microbial activities that improve methane yields. A combination of compatible substrates is chosen to improve the biomethane yield and conversion rate of organic matter. AcoD is a promising method in the delignification of lignocellulosic biomass as an acid pretreatment. Ultimate practices to control the impact of co-digestion on system performances include co-feed selection, in terms of both carbon-to-nitrogen (C/N) and mixing ratios, and other operating conditions. A detailed analysis is performed using data reported in the recent past to assess the sensitivity of influencing parameters on the resultant biogas yield. For the investigators motivated by the basic principles of AcoD technology, this review paper generates baseline data for further research work around co-digestion.

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Rabii, Anahita, Saad Aldin, Yaser Dahman, and Elsayed Elbeshbishy. "A Review on Anaerobic Co-Digestion with a Focus on the Microbial Populations and the Effect of Multi-Stage Digester Configuration." Energies 12, no. 6 (March 21, 2019): 1106. http://dx.doi.org/10.3390/en12061106.

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Recent studies have shown that anaerobic co-digestion (AnCoD) is superior to conventional anaerobic digestion (AD). The benefits of enhanced bioenergy production and solids reduction using co-substrates have attracted researchers to study the co-digestion technology and to better understand the effect of multi substrates on digester performance. This review will discuss the results of such studies with the main focus on: (1) generally the advantages of co-digestion over mono-digestion in terms of system stability, bioenergy, and solids reduction; (2) microbial consortia diversity and their synergistic impact on biogas improvement; (3) the effect of digester mode, i.e., multi-stage versus single stage digestion on AnCoD. It is essential to note that the studies reported improvement in the synergy and diverse microbial consortia when using co-digestion technologies, in addition to higher biomethane yield when using two-stage mode. A good example would be the co-digestion of biodiesel waste and glycerin with municipal waste sludge in a two-stage reactor resulting in 100% increase of biogas and 120% increase in the methane content of the produced biogas with microbial population dominated by Methanosaeta and Methanomicrobium.

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DARWIN, MARDHOTILLAH, and ATMADIAN PRATAMA. "Anaerobic Co-Digestion of Oil Palm Frond Waste with Cow Manure for Biogas Production: Influence of a Stepwise Organic Loading on the Methane Productivity)." Series II: Forestry • Wood Industry • Agricultural Food Engineering 14(63), no. 2 (December 22, 2021): 99–112. http://dx.doi.org/10.31926/but.fwiafe.2021.14.63.2.9.

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Anaerobic co-digestion of oil palm frond waste with cow-manure was evaluated. The study aimed to evaluate a stepwise organic load with an increase solid concentration to the on-going anaerobic digestion of cow manure. The anaerobic digestion process was operated in continuous mode under the mesophilic condition. Results showed that the maximum methane productivity of 1700 ml CH4∙day-1 was obtained when the anaerobic co-digestion of OPFW and cow manure was loaded with the substrate concentration between 4 and 8% TS. The pH culture dropped dramatically from 6.9 to 6.3 when substrate concentration was increased from 10 to 12% TS. The acidic pH had restricted the conversion of organic materials in which the COD removal was less than 25% removal. This study is exceedingly notable for the industrial development of waste management processes, which handle and treat tons of organic wastes daily.

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Darwin, Fazil Afrizal, Ilham Muhammad, Sarbaini, and Purwanto Satria. "Kinetics on anaerobic co-digestion of bagasse and digested cow manure with short hydraulic retention time." Research in Agricultural Engineering 63, No. 3 (September 29, 2017): 121–27. http://dx.doi.org/10.17221/18/2016-rae.

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The anaerobic co-digestion of bagasse with digested cow manure was operated in 3 l semi-continuous reactor under mesophlic temperature at 34 ± 1°C. Short hydraulic retention time and high organic loading rate applied were 10 days and 3.465 kg volatile solids (VS)/m3.day, respectively. Anaerobic co-digestion of bagasse with digested cow manure obtained higher biogas yield (69 ml/g VS) compared with the anaerobic digestion of digested cow manure alone (20.42 ml/g.VS). Kinetic assessment revealed that the maximum specific growth rate, the maximum rate of substrate consumption, half-velocity constant, endogenous decay constant and microbial growth yield obtained were 3.917 day–1, 870.309 mg/mg, 15.09 mg/l , 8.1518 day–1 and 0.0193 mg/mg, respectively. This result indicated that a longer retention time was required to allow the bacterial growth.

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Hütter, Miriam, Gregor Sailer, Benedikt Hülsemann, Joachim Müller, and Jens Poetsch. "Impact of Thermo-Mechanical Pretreatment of Sargassum muticum on Anaerobic Co-Digestion with Wheat Straw." Fermentation 9, no. 9 (September 8, 2023): 820. http://dx.doi.org/10.3390/fermentation9090820.

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Sargassum muticum (SM) is an invasive macroalgal species seasonally occurring in large quantities. While generally suitable for anaerobic digestion, recent studies resulted in low specific methane yields (SMYs), presumably due to salt, polyphenol, and high fiber contents of this marine biomass. In this study, the specific biogas yield (SBY) and SMY of SM alone as well as in co-digestion with wheat straw (WS) were investigated in batch tests at process temperatures of 44 ± 1.4 °C with a retention time of approx. 40 d. The pretreatment variants of SM were examined with regard to desalination and disintegration to potentially improve digestibility and to enhance the overall performance in anaerobic digestion. A sole mechanical treatment (pressing) and a thermo-mechanical treatment (heating and pressing) were tested. Batch assays showed that pressing increased the SMY by 15.1% whereas heating and pressing decreased the SMY by 15.7% compared to the untreated variant (87.64 ± 8.72 mL/gVS). Both anaerobic digestion experiments generally showed that co-digestion with WS can be recommended for SM, but the observed SBY and SMY were still similar to those of other studies in which SM was not pretreated. The mechanical pretreatment of SM, however, offers the potential to enhance the SMY in the anaerobic digestion of SM with WS, but further research is necessary to identify the optimum upgrading approaches since the overall SMY of SM is relatively low compared to other substrates that are commonly used in anaerobic digestion. In addition to anaerobic digestion, SM as an already available biomass could also be of interest for further utilization approaches such as fiber production.

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Kasirga, Ersin, Alan Cooper, Eliza Jane Whitman, and Neil Clifton. "Innovative Anaerobic Digestion and Co-Digestion at Inland Empire Utilities Agency." Proceedings of the Water Environment Federation 2008, no. 9 (January 1, 2008): 6724–43. http://dx.doi.org/10.2175/193864708790893594.

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Li, Wentao, Baohua Chai, Yan Lu, and Meijing Wang. "Anaerobic co-digestion of grass, alfalfa, and red clover for methane production and the kinetic analysis." BioResources 18, no. 1 (January 17, 2023): 1742–56. http://dx.doi.org/10.15376/biores.18.1.1742-1756.

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The residual of perennials in landscape trimming and agricultural interval planting are produced massively, and they can provide an innovative way to increase anaerobic digestion efficiency via co-digestion process. In this study, the bio-methane potential (BMP) of different perennial crops (grass, alfalfa, and red clover) in various feedstock concentrations based on volatile solid (VS) and the kinetic analysis of the co-digestion process were investigated. The results showed that grass and legumes reached the highest methane yield at 5 VS/L and 20 VS/L, respectively. Co-digestion of grass and perennials had better methane production of 338 mL/g VS, which is 9.1% higher than mono-digestion. Further analysis demonstrated that VS removal efficiency of mono-legumes digestion was below 60%, while co-digestion of grass and legumes can improve VS removal efficiency dramatically. Volatile fatty acids (VFAs) and ammonia in the digestate accumulated at 40 VSadded/L. Additionally, kinetic analysis was employed to predict and evaluate the performance of anaerobic digestion, with the Cone model showing the best fitting curve.

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Zhang, Huayong, Di An, Yudong Cao, Yonglan Tian, and Jinxian He. "Modeling the Methane Production Kinetics of Anaerobic Co-Digestion of Agricultural Wastes Using Sigmoidal Functions." Energies 14, no. 2 (January 6, 2021): 258. http://dx.doi.org/10.3390/en14020258.

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The modified sigmoidal bacteria growth functions (the modified Gompertz, logistic, and Richards) were used to evaluate the methane production process kinetics of agricultural wastes. The mesophilic anaerobic co-digestion experiments were conducted with various agricultural wastes as feedstocks, including cow manure, corn straw, grape leaves, vines, wine residue, strawberry leaves, and tomato leaves. The results showed that anaerobic co-digestion of cow manure and other agricultural wastes increased the methane yields while it prolonged the lag phase time. Compared with the modified Gompertz and logistic models, the modified Richards model obtained higher correlation coefficients and was able to fit experimental data better. The results of this study were expected to determine a suitable model to simulate and study the kinetic process of anaerobic co-digestion with mixed agricultural wastes as feedstocks.

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Omondi, Erick Auma, Peter Gikuma Njuru, and Peter Kuria Ndiba. "Anaerobic Co-Digestion of Water Hyacinth (E. crassipes) with Ruminal Slaughterhouse Waste for Biogas Production." International Journal of Renewable Energy Development 8, no. 3 (October 21, 2019): 253–59. http://dx.doi.org/10.14710/ijred.8.3.253-259.

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The use of biomass as renewable energy source is of interest in reducing dependence on fossil fuels and associated impacts of climate change. Water hyacinth (WH), an invasive aquatic plant of environmental concern has large biomass that is available for biogas production. Co-digestion of this largely lignocellulose biomass with other substrates may correlate process parameters and improve biogas production. This study evaluated co-digestion of WH biomass with various mix proportions of ruminal slaughterhouse waste (RSW) at 24, 32 and 37°C in order to assess the optimum proportion and temperature. The rate of biomethanation increased with temperature from 0.23 at 24ºC to 0.75 and 0.96 at 32ºC and 37ºC, respectively, and similarly methane yield improved from 14 at 24ºC to 40 and 52 L/kg air dried water hyacinth at 32ºC and 37ºC respectively. A WH: RSW ratio of 30% showed optimum acclimatization and methane yield in a residence time of 60 days. The duration of the initial drop in pH that indicates hydrolysis stage decreased with increase in proportion of RSW, indicating faster hydrolysis and fermentation processes. Longer and stable latter alkaline pH zone suggested improved biomethanation and greater biogas production. Co-digestion with 30% RSW at 24ºC improved biogas yield by 75% from 8.05 to 14.09L/Kg biomass, methane component of biogas by 9% from 59 to 68% and reduced the retention time for substrate by 36%, suggesting synergy in co-digestion with respect to biogas quality. Changing the temperature from 24 to 32ºC increased the yield by 186% and reduced retention time by 73%. The results demonstrated synergy in co-digestion of the two substrates and the process dynamics that are useful in a possible process commercialization. ©2019. CBIORE-IJRED. All rights reserved

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Nazifa, Tasnia Hassan, Noori M. Cata Saady, Carlos Bazan, Sohrab Zendehboudi, Adnan Aftab, and Talib M. Albayati. "Anaerobic Digestion of Blood from Slaughtered Livestock: A Review." Energies 14, no. 18 (September 9, 2021): 5666. http://dx.doi.org/10.3390/en14185666.

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Blood from livestock slaughtering imposes a high organic pollution load and risks. If it is discharged untreated to sewer systems, it increases the organic pollution load on wastewater treatment plants by 35–50%. This paper reviews blood anaerobic digestion. It analyzes the quantities, composition, methane potential reported, microbiology, biochemical pathways of blood protein degradation, environmental and health issues, and strategies suggested to manage them during livestock blood anaerobic digestion. Although challenging, anaerobic digestion of blood as a mono-substrate is possible if the culture-reactor system is controlled based on a complete characterization and understanding of the microbial community and its metabolic activities. Co-digestion of blood and other feedstock proceeds well if the mixtures are well designed. Generally, the specific methane yield from digesting blood alone ranges between zero and 0.45 m3 kg−1 protein, whereas for co-digesting blood and other substrates, the yield varies between 0.1 and 0.7 m3 kg−1 volatile solids. More research is required for microbiology and kinetics, the role of adsorbents, reactor configuration, and culture adaptation during anaerobic digestion of blood to better control the process.

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Zhao, Hongmei, Shibo Cheng, Congqi Zhao, Kejiang Ruan, Junju Xu, and Xiaohong Cheng. "Effect of nano-Al₂O₃ and multi-walled carbon nanotubes on the anaerobic mono-digestion of sludge and the co-digestion of tobacco waste and sludge." RSC Advances 13, no. 50 (2023): 35621–28. http://dx.doi.org/10.1039/d3ra07170g.

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Journal articles on the topic 'Anaerobic co-digestion'

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