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Journal articles on the topic 'Anaerobic digester'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Durogbade, Samuel Adesina, Temitayo Bukola Korode, and Bamidele Honesty Akpeji. "Production of Biogas from Plantain Peels, Using Cow Dung as Substrate." British Journal of Multidisciplinary and Advanced Studies 5, no. 2 (2024): 40–53. http://dx.doi.org/10.37745/bjmas.2022.0471.

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In a biodigester setup, the researchers investigated the production of methane gas using plantain peel and cow dung as substrates. Two buncher flasks, corks, a glass tube, and a calibrated conical flask comprised the biodigester setup. The setup involved anaerobic digestion processes, analyzing different ratios of cow dung and plantain peel to produce biogas. The main anaerobic digestion process was carried out in Buncher flask one, after which the methane gas formed was sent to Buncher flask two through a rubber tube, where the by-products such as carbon dioxide and hydrogen sulfide were abso

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Shang, Y., B. R. Johnson, and R. Sieger. "Application of the IWA Anaerobic Digestion Model (ADM1) for simulating full-scale anaerobic sewage sludge digestion." Water Science and Technology 52, no. 1-2 (2005): 487–92. http://dx.doi.org/10.2166/wst.2005.0557.

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A steady-state implementation of the IWA Anaerobic Digestion Model No. 1 (ADM1) has been applied to the anaerobic digesters in two wastewater treatment plants. The two plants have a wastewater treatment capacity of 76,000 and 820,000 m3/day, respectively, with approximately 12 and 205 dry metric tons sludge fed to digesters per day. The main purpose of this study is to compare the ADM1 model results with full-scale anaerobic digestion performance. For both plants, the prediction of the steady-state ADM1 implementation using the suggested physico-chemical and biochemical parameter values was ab

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3

Yakubu, Ubaidullahi, Sani Umar Mohammed, and Mary Samuel. "TESTING THE PERFORMANCE OF TWO DIFFERENT DIGESTERS FOR BIOGAS PRODUCTION FROM HOUSEHOLD WASTE CO-DIGESTED WITH COW DUNG." FUDMA JOURNAL OF SCIENCES 8, no. 3 (2024): 183–89. http://dx.doi.org/10.33003/fjs-2024-0803-2544.

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The research was carried out at Mechanical Engineering Department, Federal University Dutsin-Ma, Katsina State, Nigeria. Different researches of bio-digesters have been conducted for biogas production but the physico-chemical properties of wastes, constituents of biogas and volume of digesters were not considered in previous research which resulted to poor performance of digesters by producing low flame. Hence the physico-chemical properties of wastes were determined, constituents of biogas were determined and volumes of digesters were considered for this research work so as to have effective

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4

Pagilla, Krishna R., Kent C. Craney, and Wendell H. Kido. "Causes and effects of foaming in anaerobic sludge digesters." Water Science and Technology 36, no. 6-7 (1997): 463–70. http://dx.doi.org/10.2166/wst.1997.0624.

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Full scale anaerobic digesters treating mixed sludge containing primary sludge and thickened waste activated sludge were investigated for causes and effects of foaming. Sludge samples were collected from different depths of two full scale digesters, one gas-mixed, and the other mechanically-mixed, to determine the extent of foaming and its effects on anaerobic digestion; both digesters were fed the same feed sludge (3.4% TS) and at the same feed rate (about 2.2 kg TS/m3.day). The average depth of the surface foam layer in the gas-mixed and mechanically-mixed digester were 2.4 and 1.3 m respect

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5

Noike, T., and J. Matsumoto. "Upgrading of Anaerobic Digestion Processes for Night Soil." Water Science and Technology 18, no. 7-8 (1986): 249–56. http://dx.doi.org/10.2166/wst.1986.0296.

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The upgrading of night soil anaerobic digestion processes was studied by field investigation of the performance of anaerobic digesters in existing night soil treatment plants and by serai-continuous experiments with bench-scale digesters. Both the average monthly amount of collected night soil fed to a digester and the concentration of volatile solids in night soil increased in winter. A good correlation was found to exist between gas production and digestion temperature. The COD removal rate in the first digester was markedly higher than that in the second digester. The stirring period in the

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6

Naphtali, James, Alexander W. Y. Chan, Faizan Saleem, Enze Li, Jacob Devries, and Herb E. Schellhorn. "Comparative Metagenomics of Anaerobic Digester Communities Reveals Sulfidogenic and Methanogenic Microbial Subgroups in Conventional and Plug Flow Residential Septic Tank Systems." Processes 10, no. 3 (2022): 436. http://dx.doi.org/10.3390/pr10030436.

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On-site wastewater treatment systems (OWTS) are primarily monitored using physiochemical factors, including chemical oxygen demand (COD) and residual total suspended solids (TSS), which are indirect measures of the microbial action during the anaerobic digestion process. Changes in anaerobic digester microbial communities can alter the digester performance, but this information cannot be directly obtained from traditional physicochemical indicators. The potential of metagenomic DNA sequencing as a tool for taxonomic and functional profiling of microbial communities was examined in both common

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Ward, Amanda, H. David Stensel, John F. Ferguson, Gregory Ma, and Stan Hummel. "Effect of autothermal treatment on anaerobic digestion in the dual digestion process." Water Science and Technology 38, no. 8-9 (1998): 435–42. http://dx.doi.org/10.2166/wst.1998.0835.

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The performance of two laboratory mesophilic anaerobic digesters was studied to determine if the claims for improved mesophilic anaerobic digestion following autothermal pre-treatment are valid and if the benefits claimed are affected by the mesophilic digester SRT. One digester was fed sludge taken after a full-scale autothermal reactor and the other was fed sludge from the same plant just before the autothermal treatment unit. Autothermal treatment did not significantly increase volatile solids destruction kinetics during subsequent anaerobic digestion. The VS destruction rate was 2.7 to 2.8

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8

Tanguay-Rioux, Fabrice, Laurent Spreutels, Caroline Roy, and Jean-Claude Frigon. "Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester." Bioengineering 11, no. 1 (2023): 6. http://dx.doi.org/10.3390/bioengineering11010006.

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Anaerobic digestion of food waste still faces important challenges despite its world-wide application. An important fraction of food waste is composed of organic material having a low hydrolysis rate and which is often not degraded in digesters. The addition of this less hydrolysable fraction into anaerobic digesters requires a longer hydraulic residence time, and therefore leads to oversizing of the digesters. To overcome this problem, the conversion of the highly biodegradable liquid fraction from fruit and vegetable waste in a up-flow anaerobic sludge blanket (UASB) digester is proposed and

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9

Tseng, D. W. S., and M. A. Connor. "The effect of disc submergence level on the performance of a laboratory-scale anaerobic rotating biological contactor: implications for digester design and modelling." Water Science and Technology 30, no. 12 (1994): 357–65. http://dx.doi.org/10.2166/wst.1994.0635.

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A hypothesis was advanced that an anaerobic rotating biological contactor (AnRBC) digester, if operated with its discs half rather than fully submerged, should show an enhanced capability to withstand shock loads. Laboratory-scale AnRBC digesters were constructed and their performance under 50% and 100% disc submergence conditions compared. In all cases, under otherwise comparable conditions the performance in the 50% disc submergence mode was better. From measurements, including biogas hydrogen concentration, pH and propionic acid content of the digester liquid, it was concluded that it was t

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10

Villegas, J. D., H. Fruteau de Laclos, J. Dovat, Y. Membrez, and C. Holliger. "Nitrogen removal from digested manure in a simple one-stage process." Water Science and Technology 63, no. 9 (2011): 1991–96. http://dx.doi.org/10.2166/wst.2011.430.

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A process based on partial nitrification and recirculation into the anaerobic digester was studied to remove nitrogen from digested manure and thus reduce enhanced gaseous ammonia emissions due to on-farm biogas production. An anaerobic reactor representing an anaerobic manure digester was fed with a nitrite solution and digested manure liquor. Nitrite was efficiently removed from the influent and ammonium formation was observed first. Ammonium was subsequently eliminated up to a maximum of 90% of the influent concentration, indicating anaerobic ammonium oxidation activity. This activity, howe

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11

Tinajero, A., and A. Noyola. "Increasing microbial activity in thermophilic anaerobic digestion of physicochemical sludge." Water Science and Technology 54, no. 2 (2006): 245–51. http://dx.doi.org/10.2166/wst.2006.512.

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Two thermophilic lab-scale reactors of 5 L were operated on a daily fed basis. Digester T1 received raw sludge (control) and digester T2 was fed with raw sludge plus metallic micronutrients and a bacilli additive. Raw sludge was obtained from a municipal chemically enhanced primary treatment plant. The effect of additives was clear on methane production, since on day 50, digester T2 produced 900 ml more methane than T1, an increase of 64%. On day 80, T2 reached twice the production of biogas of T1. Volatile solid removal (% VSR) in T2 increased to 29%; while T1 achieved only 15%. Acetic acid c

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12

Frigon, J. C., T. Bruneau, R. Moletta, and S. R. Guiot. "Coupled anaerobic–aerobic treatment of whey wastewater in a sequencing batch reactor: proof of concept." Water Science and Technology 55, no. 10 (2007): 201–8. http://dx.doi.org/10.2166/wst.2007.323.

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A proof of concept was performed in order to verify if the coupling of anaerobic and aerobic conditions inside the same digester could efficiently treat a reconstituted whey wastewater at 21 °C. The sequencing batch reactor (SBR) cycles combined initial anaerobic phase and final aerobic phase with reduced aeration. A series of 24 h cycles in 0.5 L digesters, with four different levels of oxygenation (none, 54, 108 and 182 mgO2 per gram of chemical oxygen demand (COD)), showed residual soluble chemical oxygen demand (sCOD) of 683±46, 720±33, 581±45, 1,239±15 mg L−1, respectively. Acetate and hy

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13

Sacks, J., and C. A. Buckley. "Anaerobic treatment of textile size effluent." Water Science and Technology 40, no. 1 (1999): 177–82. http://dx.doi.org/10.2166/wst.1999.0038.

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This investigation focused on the KwaZulu-Natal province, where a number of under-utilised and under-performing anaerobic digesters were identified. The aim of the study was to assess the potential for treatment of high-strength or toxic organic agro-industrial effluents in the available capacity. The anaerobic digestion of a textile size effluent was investigated. Inhibitory components and concentrations of the solution were identified. The size solution was degraded anaerobically but could cause overloading of a digester at high concentrations. The performance efficiency of the anaerobic dig

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14

Shrestha, Sagar, and Sunil Prasad Lohani. "CFD analysis for mixing performance of different types of household biodigesters." Clean Energy 6, no. 2 (2022): 1090–99. http://dx.doi.org/10.1093/ce/zkac009.

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Abstract Household biodigesters are self-mixing anaerobic digesters used mostly in rural areas of developing countries as a reliable source of clean cooking energy. For an efficient anaerobic digestion process, the mixing of slurry inside the digester is regarded as one of the most important parameters. In this study, the mixing of slurry in three different designs of household digesters, namely the fixed-dome digester (GGC 2047 model), plug-flow digester and prefabricated plastic digester, are investigated and compared using computational fluid dynamics. A 3D transient simulation is performed

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15

Rönner-Holm, S. G. E., A. Żak, and N. C. Holm. "Comparison of different conditions, substrates and operation modes by dynamic simulation of a full-scale anaerobic SBR plant." Water Science and Technology 65, no. 3 (2012): 558–66. http://dx.doi.org/10.2166/wst.2012.887.

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Simulation studies for a full-scale anaerobic unit of a wastewater treatment plant (WWTP) were performed using the anaerobic digestion model no. 1 (ADM1). The anaerobic full-scale plant consists of one mesophilic and one thermophilic digester, operated in an anaerobic sequential batch reactor (ASBR) mode, and sludge enrichment reactors (SER) for each digester. The digesters are fed with a mixture of vegetable waste and process wastewater from the food factory. Characteristics such as CODtotal, Ntotal and NH4-N concentrations in the influent and effluent of the digester and SERs were measured a

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16

Jenicek, P., C. A. Celis, J. Koubova, and D. Pokorna. "Comparison of microbial activity in anaerobic and microaerobic digesters." Water Science and Technology 63, no. 10 (2011): 2244–49. http://dx.doi.org/10.2166/wst.2011.579.

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Microaerobic alternative of anaerobic digestion offers many advantages especially when sulfide concentration in the digester is high. For better understanding of the microaerobic technology more detailed characterization of biomass activity is needed. Two equal digesters were operated under the same condition except of microaeration in one of them. During long term operation of anaerobic and microaerobic digesters the sludge quality and the biomass activity was monitored. The activity of sulfide oxidizing bacteria of microaerobic biomass was significantly higher in comparison with anaerobic bi

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17

Syed Sabeer Ali, S. N., R. Omar, H. Che Man, A. I. Md Idris, and H. A. Tajuddin. "Foaming Tendency in Anaerobic Digestion of Wastewater Inoculated with Anaerobic Sludge and Cow Manure: Effect of Protein Concentration." IOP Conference Series: Materials Science and Engineering 1257, no. 1 (2022): 012043. http://dx.doi.org/10.1088/1757-899x/1257/1/012043.

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Abstract Foaming has impacted the digestion process causing severe process failures. The basis of foaming is often unclear due to multiple foaming compounds in a single system. This study aims to elucidate the effect of protein concentration on foaming in anaerobic sludge and cow manure (CM) digesters inoculated with synthetic wastewater as a substrate. Gelatine was used to alter the protein concentration in the digesters. The foaming tendency, biogas production, protein, and chemical oxygen demand (COD) removal were measured to comprehend the findings. The results show that the foaming tenden

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18

Wu, Jing, Pengjuan Zhao, Lei Tian, Lin Shi, and Hanchang Shi. "Internal circulation anaerobic digester—a upflow anaerobic sludge digester." Journal of Biotechnology 150 (November 2010): 39. http://dx.doi.org/10.1016/j.jbiotec.2010.08.111.

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19

Pradana, Hendra Andiananta. "ANAEROBIC DIGESTER VARIATION FOR BIOGAS PRODUCTION ON COFFEE WASTEWATER TREATMENT." Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 8, no. 3 (2019): 164. http://dx.doi.org/10.23960/jtep-l.v8i3.164-174.

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Wet coffee processing methods will produce waste water containing organic matter. The high content of organic matter can be utilized as biogas through the anaerobic process. Biogas becomes renewable energy source. Anaerobic digesters construction can affect removal process of wastewater pollution and biogas quantity. The research aim’s was determine the performance biogas production of digester construction on conventional digester, CSTR and UASB from coffee waste water. The conventional digester worked without temperature control system, a UASB digester, and CSTR digester worked with temperat

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20

Mirtsou-Xanthopoulou, Chrysoula, Ioannis V. Skiadas, and Hariklia N. Gavala. "On the Effect of Aqueous Ammonia Soaking Pre-Treatment on Continuous Anaerobic Digestion of Digested Swine Manure Fibers." Molecules 24, no. 13 (2019): 2469. http://dx.doi.org/10.3390/molecules24132469.

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(1) Background: The continuously increasing demand for renewable energy sources renders anaerobic digestion as one of the most promising technologies for renewable energy production. Due to the animal production intensification, manure is being used as the primary feedstock for most biogas plants. Their economical profitable operation, however, relies on increasing the methane yield from the solid fraction of manure, which is not so easily degradable. The solid fraction after anaerobic digestion, the so-called digested fibers, consists mainly of hardly biodegradable material and comes at a low

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N. Sharma, U. G. Phutela, S. K. Khattra, and I. Singh. "Valorization of spent mushroom substrate (SMS) along with rice straw as feedstock for efficient bio gasification." Ecology, Environment and Conservation 29, suppl (2023): 332–39. http://dx.doi.org/10.53550/eec.2023.v29i06s.050.

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Wastes generated after mushroom harvesting are known as spent mushroom substrate (SMS) which causes contamination of the environment. Anaerobic digestion is an economical and viable technology used for the management of several types of agricultural wastes, thus generating syngas that has many thermal applications. The current manuscript reports the potential of SMS for anaerobic digestion in five different combinations with rice straw, cattle dung, and bio-digested slurry. The kinetics of the biogasification process occurring in digesters was analyzed by modified Gompertz model. Results showe

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Oktavitri, Nur Indradewi, Wahyu Budi Pratiwi, Indah Purnamasari, Mufrihatul Hayati, Mega Rosita Fitrianingtyas, and Semma Hadinnata. "Anaerobic Digestion of Slaughterhouse Wastewater: CO₂ Capture of Biogas Using Chlorella vulgaris." Indonesian Journal of Chemistry 19, no. 1 (2019): 1. http://dx.doi.org/10.22146/ijc.25129.

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Biogas quality from anaerobic digester influenced the combustion of biogas. A high percentage of CO2 in biogas indicates the low quality of biogas. Abatement of CO2 using microalgae, such as Chlorella vulgaris could enhance the quality of biogas. The aim of this research was to observe the ability of C. vulgaris on CO2 removal from slaughterhouse wastewater biogas. In this research, two anaerobic digesters were provided with the different condition of biogas collector bag. The first digester was combined with only biogas collector bag, while another digester was combined with C. Vulgaris. Slau

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Taskaev, M. V., L. A. Garifyanova, and M. V. Svalova. "Analysis of the Methane Tanks Structures for the Sludge Treatment from Sewage Treatment Plants." Intellekt. Sist. Proizv. 20, no. 1 (2022): 96–105. http://dx.doi.org/10.22213/2410-9304-2022-1-96-105.

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The paper presents analysis of digester designs, considers the advantages and disadvantages of biogas plants. Experimental data of technological process of anaerobic digestion in biogas plant are given, relation between temperature and time of raw sludge digestion is shown. The methodology of research of technological processes occurring in digesters at the experimental biogas plant AN-BR-3 is given. The principle of digesters operation is described. The most effective thermophilic mode of digestion is revealed. The relation between temperature and time during digestion in biogas plant has bee

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Daly, Sarah E., and Ji-Qin Ni. "Machine Learning Prediction of Foaming in Anaerobic Co-Digestion from Six Key Process Parameters." Fermentation 10, no. 12 (2024): 639. https://doi.org/10.3390/fermentation10120639.

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Foaming in co-digested anaerobic digesters can reduce biogas production, leading to economic loss. However, the underlying causes of foaming are not completely understood. This study investigated a field-scale mesophilic digester system that experienced intermittent foaming, employing experimental and modeling methods over a 16-month period. Samples were collected during both foaming and non-foaming events and were thoroughly characterized for methane (CH4) yields and different physical and chemical concentrations, including volatile solids (VS), metals, total phosphorus (TP), total chemical o

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Yoshizu, Daichi, Soranosuke Shimizu, Miyu Tsuchiya, Keisuke Tomita, Atsushi Kouzuma, and Kazuya Watanabe. "Isolation of Electrochemically Active Bacteria from an Anaerobic Digester Treating Food Waste and Their Characterization." Microorganisms 12, no. 8 (2024): 1645. http://dx.doi.org/10.3390/microorganisms12081645.

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Studies have used anaerobic-digester sludge and/or effluent as inocula for bioelectrochemical systems (BESs), such as microbial fuel cells (MFCs), for power generation, while limited studies have isolated and characterized electrochemically active bacteria (EAB) that inhabit anaerobic digesters. In the present work, single-chamber MFCs were operated using the anaerobic-digester effluent as the sole source of organics and microbes, and attempts were made to isolate EAB from anode biofilms in MFCs by repeated anaerobic cultivations on agar plates. Red colonies were selected from those grown on t

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Page, D. I., K. L. Hickey, R. Narula, A. L. Main, and S. J. Grimberg. "Modeling anaerobic digestion of dairy manure using the IWA Anaerobic Digestion Model no. 1 (ADM1)." Water Science and Technology 58, no. 3 (2008): 689–95. http://dx.doi.org/10.2166/wst.2008.678.

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The Anaerobic Digestion Model No. 1 (ADM1) can be used to describe treatment of dairy manure once manure characteristics have been incorporated in the model. In this paper a parameter set is presented that can be used with ADM1 for simulation of dairy manure digester performance. Model results have been verified with bench-scale experiments and reported data from full-scale systems. Model predictions fit experimental data best for biogas composition and digester effluent COD. Simulated biogas productions were inconsistent with measurements from three different digesters. The model overpredicte

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Loiacono, J., P. Pitt, D. Jenkins, and T. Cockburn. "The Influence of Operating Experience on Wastewater Treatment Plant Design in San Francisco, California, USA." Water Science and Technology 25, no. 4-5 (1992): 257–64. http://dx.doi.org/10.2166/wst.1992.0503.

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Three main areas will be covered regarding the design and operation of a pure oxygen activated sludge plant. Air entrainment occurred in RAS and influent lines and gas entrainment occurred at the sixth stage effluent weirs in an enclosed pure oxygen aeration basin. This caused the oxygen feed to be shut off due to overpressurization and resulted in a combination of high apparent O2 usage and high vent gas purities. The use of an anaerobic selector for Nocardia control is discussed. Anaerobic digester operation has been adversely affected by Nocardia-dominated waste activated sludge. The effect

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Harrison, Ogala, and Ige Ayodeji Rapheal. "Biogas production from blends of fonio husk and donkey dung via anaerobic digestion for sustainable development." International Journal of Advanced Chemistry 9, no. 1 (2020): 1. http://dx.doi.org/10.14419/ijac.v9i1.31254.

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There is growing public concern over potential impact on environmental quality caused by animal wastes. Anaerobic digestion, a biological conversion process can be used to obtain energy from biologicall wastes. This study explored the production of biogas from co-digestion of fonio hus and donkey dung using anaerobic biological conversion. The digesters were labeled as; digester A –Fonio husk only, digester B - donkey dung only, digester C – Fonio husk (300g) and Donkey Dung (200g), digester D – Fonio husk (200g) and donkey dung (300g). Proximate analysis of the substrates before and after dig

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Engeli, H., W. Edelmann, J. Fuchs, and K. Rottermann. "Survival of Plant Pathogens and Weed Seeds during Anaerobic Digestion." Water Science and Technology 27, no. 2 (1993): 69–76. http://dx.doi.org/10.2166/wst.1993.0079.

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The survival of Plasmodiophora brassicae was studied at digestion temperatures of 35 °C and 55 °C in laboratory batch digesters within one and two weeks, respectively. The study showed that digestion at 55 °C almost completely reduced the ability of infecting bait plants. The seeds of Rumex obtusifolius and Lycopersicon lycopersicum (tomatoes) were completely destroyed at 55 °C and a digestion time of 14 days, in laboratory batch digesters. The experiments carried out in a two stage pilot plant (Leach-Bed Solid Phase batch Digester for hydrolysis and a pulsating dynamic anaerobic filter for me

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Britz, T. J., G. Spangenberg, and C. A. Venter. "Acidogenic microbial species diversity in anaerobic digesters treating different substrates." Water Science and Technology 30, no. 12 (1994): 55–61. http://dx.doi.org/10.2166/wst.1994.0581.

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Microbial species diversity was determined for the acidogenic populations of four different digesters treating landfill leachate, a petrochemical effluent and sewage. The digesters were a downflow fixed-bed, conventional, cold conventional and an upflow hybrid design. The 288 strains isolated from the digesters were characterized using API test systems and identifications confirmed using current taxonomic methods. The taxonomic diversity was determined using the Shannon (H′) and equitability (J′) indices. The species from the four digesters were very similar with the exception of those from th

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Lindorfer, H., R. Braun, and R. Kirchmayr. "Self-heating of anaerobic digesters using energy crops." Water Science and Technology 53, no. 8 (2006): 159–66. http://dx.doi.org/10.2166/wst.2006.246.

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With the increasing application of energy crops in agricultural biogas plants and increasing digester volumes, the phenomenon of self-heating in anaerobic digesters appeared in some cases. Until now this development was just known from aerobic systems. To obtain an idea of the thermodynamics inside an anaerobic digester, a detailed analysis of all heat fluxes in a full-scale agricultural biogas plant was carried out. Several experiments were realised to quantify the influences of different internal and external energy sources. To estimate the impact of self-heating in anaerobic systems, data o

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Hardegen, Justus, Patrick Braeutigam, Christian Abendroth, and Thomas Wichard. "Bisphenol A: Quantification in Complex Matrices and Removal by Anaerobic Sludges." Pollutants 1, no. 4 (2021): 194–206. http://dx.doi.org/10.3390/pollutants1040016.

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The endocrine disruptor bisphenol A (BPA) is one of the most commonly found micropollutants in the environment. However, the biodegradation of BPA under anaerobic (methanogenic) conditions is still an understudied process in wastewater treatment systems. The current study thus addresses the need for a simple and user-friendly analytical method for the rapid and accurate quantification of BPA in complex matrices such as digested and co-digester sludges. We established a microwave-assisted extraction method, followed by derivatization and gas chromatography–mass spectrometry to quantify BPA by c

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Charles, W., N. P. Carnaje, and R. Cord-Ruwisch. "Methane conversion efficiency as a simple control parameter for an anaerobic digester at high loading rates." Water Science and Technology 64, no. 2 (2011): 534–40. http://dx.doi.org/10.2166/wst.2011.082.

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The anaerobic digestion process is globally applied to the treatment of highly concentrated wastes such as industrial and rural effluents, and sewage sludge. However, it is known to be relatively unstable. When loaded with high concentrations of organic material, unwanted volatile fatty acids (VFA) are often produced rather than methane (CH4) gas which can lead to digester acidification and failure. This study investigated digester behaviour under high loading rates, testing the usefulness of stoichiometric methane conversion efficiency as a digester control parameter at high loading rates. Ou

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Charles, W., R. Cord-Ruwisch, G. Ho, M. Costa, and P. Spencer. "Solutions to a combined problem of excessive hydrogen sulfide in biogas and struvite scaling." Water Science and Technology 53, no. 6 (2006): 203–11. http://dx.doi.org/10.2166/wst.2006.198.

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The Woodman Point Wastewater Treatment Plant (WWTP) in Western Australia has experienced two separate problems causing avoidable maintenance costs: the build-up of massive struvite (MgNH4PO4· 6H2O) scaling downstream of the anaerobic digester and the formation of hydrogen sulfide (H2S) levels in the digester gas to levels that compromised gas engine operation and caused high operating costs on the gas scrubber. As both problems hang together with a chemical imbalance in the anaerobic digester, we decided to investigate whether both problems could be (feasibly and economically) addressed by a c

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Rojas Oropeza, M., N. Cabirol, S. Ortega, L. P. Castro Ortiz, and A. Noyola. "Removal of fecal indicator organisms and parasites (fecal coliforms and helminth eggs) from municipal biologic sludge by anaerobic mesophilic and thermophilic digestion." Water Science and Technology 44, no. 4 (2001): 97–101. http://dx.doi.org/10.2166/wst.2001.0189.

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In this work, two egg-shaped, 5L-volume, anaerobic sludge digesters were used, one under mesophilic conditions (35°C, M1), and the other under thermophilic conditions (55°C, T1). Both digesters were fed with the purged sludge from an anaerobic treatment plant (start-up period) and from an activated sludge plant (stabilization period), treating municipal wastewaters. The purpose of the study was to establish the technical feasibility of the anaerobic thermophilic sludge treatment comparatively, during the stages of start-up and stabilization of the process, for removing pathogenic microorganism

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Sindall, R., J. Bridgeman, and C. Carliell-Marquet. "Velocity gradient as a tool to characterise the link between mixing and biogas production in anaerobic waste digesters." Water Science and Technology 67, no. 12 (2013): 2800–2806. http://dx.doi.org/10.2166/wst.2013.206.

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Whilst the importance of mixing in anaerobic digesters to enhance process performance and gas production is well recognised, the specific effects of mixing regime on biogas production are not clear. Here, the velocity gradient is used to demonstrate the importance of minimally mixed zones in a digester, with computational fluid dynamics (CFD) models indicating that 20–85% of a laboratory-scale digester experiences local velocity gradients of less than 10 s−1, dependent on mixing speed. Experimental results indicate that there is a threshold above which increased mixing speed (and hence velocit

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Park, C., A. Bega, C. Unlu, et al. "Acetoclastic methanogens in an anaerobic digester could be susceptible to trace metal supplementation." Water Science and Technology 62, no. 12 (2010): 2905–11. http://dx.doi.org/10.2166/wst.2010.161.

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The objective of this study was to investigate the effects of nutrient supplementation on anaerobic biomass. While many studies emphasized the importance of supplementing trace metals such as iron, cobalt, and nickel for maximum methanogenic activity, there is no evidence whether such supplements, even at relatively low concentration, could perturb anaerobic biomass. Effects of supplementing nutrients, including yeast extract, on anaerobic biomass from two full-scale mesophilic digesters, operating under different conditions, at the North East Water Pollution Control Plant in Philadelphia, Pen

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Loughrin, John, Stacy Antle, Karamat Sistani, and Nanh Lovanh. "In Situ Acoustic Treatment of Anaerobic Digesters to Improve Biogas Yields." Environments 7, no. 2 (2020): 11. http://dx.doi.org/10.3390/environments7020011.

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Sound has the potential to increase biogas yields and enhance wastewater degradation in anaerobic digesters. To assess this potential, two pilot-scale digestion systems were operated, with one exposed to sound at less than 10 kHz and with one acting as a control. Sounds used were sine waves, broadband noise, and orchestral compositions. Weekly biogas production from sound-treated digesters was 18,900 L, more than twice that of the control digester. The sound-treated digesters were primarily exposed to orchestral compositions, because this made cavitational events easier to identify and because

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Sebayuana, Kadek, Tjokorda Gde Tirta Nindhia, I. Wayan Surata, Tjokorda Sari Nindhia, Shailendra Kumar Shukla, and Samir Kumar Khanal. "Performance of 500 Liter Stainless Steel Portable Biogas Anaerobic Digester with Agitator Designed for the Tropical Developing Country." Key Engineering Materials 877 (February 2021): 160–65. http://dx.doi.org/10.4028/www.scientific.net/kem.877.160.

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This document it is established that 2 types of biogas anaerobic digester that usually found in developing country. First type is fixed dome type of anaerobic digester and secondly is floating drum biogas anaerobic digester. Both of this type have draw back that the anaerobic process is not completed with agitation process that yield low rate of biogas production. Other serious problem is the release of slurry cannot optimal. Some of the slurry will still remain stay in the anaerobic digester especially scum. To drain and cleaning the fixed dome or floating drum biogas anaerobic digester is ma

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Nazo Edith, Kpata-Konan, Kouame Francis, and NGBADJO Tanon Virginie. "OPTIMIZATION OF CASSAVA EFFLUENT BIOMETHANIZATION WITH ASH AS COSUBSTRATE." International Journal of Advanced Research 11, no. 09 (2023): 1190–97. http://dx.doi.org/10.21474/ijar01/17634.

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The main objective of this study is to determine the optimal conditions for anaerobic biodigestion of cassava effluents with the ash of cassava peels as co-substrate. To do this, three (03) digesters were used in which were put effluent + ash for digester 1, effluent + ash + cow dung for digester 2 and effluent + ash + urine for digester 3. The physico-chemical parameters (temperature, pH), biochemical parameters (COD and TKN) and the volume of biogas produced were quantified. In each of the reaction media a decrease in values was observed in pH (digester 1: 7.15 to 6.92 digester 2: 7.20 to 5.

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Tepe, N., D. Yurtsever, M. Duran, R. J. Mehta, C. Bruno, and V. L. Punzi. "Odor control during post-digestion processing of biosolids through bioaugmentation of anaerobic digestion." Water Science and Technology 57, no. 4 (2008): 589–94. http://dx.doi.org/10.2166/wst.2008.008.

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The effects of bioaugmenting anaerobic biosolids digestion with a commercial product that contained selected strains of bacteria from genera Bacillus, Pseudomonas, and Actinomycetes, along with ancillary organic compounds containing various micronutrients were evaluated. The main objective of the study was to investigate the effects of bioaugmentation specifically on the performance of methanogenesis during anaerobic digestion, as well as on the generation and fate of odor-causing compounds during the storage of the digested biosolids. The bench-scale digester with 5 g/L bioaugment generated 2

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Ghosh, S., M. P. Henry, A. Sajjad, M. C. Mensinger, and J. L. Arora. "Pilot-scale gasification of municipal solid wastes by high-rate and two-phase anaerobic digestion (TPAD)." Water Science and Technology 41, no. 3 (2000): 101–10. http://dx.doi.org/10.2166/wst.2000.0061.

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Bioconversion of municipal solid waste-sludge blend by conventional high-rate and two-phase anaerobic digestion was studied. RDF (refused-derived fuel)-quality feed produced in a Madison, Wisconsin, USA, MRF (materials-recovery facility) was used. High-rate digestion experiments were conducted with bench-scale digesters under target operating conditions developed from an economic feasibility study. The effects of digestion temperature, RDF content of digester feed, HRT, loading rate, RDF particle size, and RDF pretreatment with cellulase or dilute solutions of NaOH or lime on digester performa

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Siegrist, H., W. Hunziker, and H. Hofer. "Anaerobic digestion of slaughterhouse waste with UF-membrane separation and recycling of permeate after free ammonia stripping." Water Science and Technology 52, no. 1-2 (2005): 531–36. http://dx.doi.org/10.2166/wst.2005.0563.

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Anaerobic digestion can adapt to free ammonia to a certain extent. During the anaerobic digestion of slaughterhouse waste, however, an ammonia concentration of up to 15 g N l−1 can be reached in the sludge liquid and this will even inhibit adapted sludge. To lower this concentration, a fraction of the digester liquid must therefore be continuously separated from the digested sludge and the free ammonia stripped before the liquid is recycled to the digester. A mesophilic laboratory digester was successfully operated with an ammonium concentration of 4–5 g l−1 and a pH of 8.0–8.4. After free amm

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Gavaghan, P. D., J. L. Sykora, W. Jakubowski, et al. "Inactivation of Giardia by Anaerobic Digestion of Sludge." Water Science and Technology 27, no. 3-4 (1993): 111–14. http://dx.doi.org/10.2166/wst.1993.0331.

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Sludge produced by a model wastewater treatment plant and anaerobically digested at 37°C in a laboratory digester was seeded with G. muris cysts. Samples from the digester were collected at 0:15, 4:00, 8:00, 11:30 and 26:00 hrs. Cyst inactivation was measured by excystation and direct counts of G. muris cysts using a hemacytometer and a phase contrast microscope. The results showed that 99.9% of the cysts were inactivated within apgroximately 18:00 hrs of exposure. This demonstrates that the standard sludge digestion (37°C for 24 hrs) will eliminate most of the cysts (greater than 99.9%).

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Vesvikar, M. S., R. Varma, K. Karim, and M. Al-Dahhan. "Flow pattern visualization in a mimic anaerobic digester: experimental and computational studies." Water Science and Technology 52, no. 1-2 (2005): 537–43. http://dx.doi.org/10.2166/wst.2005.0564.

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Advanced non-invasive experiments like computer automated radioactive particle tracking and computed tomography along with computational fluid dynamics (CFD) simulations were performed in mimic anaerobic digesters to visualize their flow pattern and obtain hydrodynamic parameters. The mixing in the digester was provided by sparging gas at three different flow rates. The simulation results in terms of overall flow pattern, location of circulation cells and stagnant regions, trends of liquid velocity profiles, and volume of dead zones agree reasonably well with the experimental data. CFD simulat

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Mohamed Ali, Amina, Md Zahangir Alam, Fatouma Mohamed Abdoul-latif, et al. "Production of Biogas from Food Waste Using the Anaerobic Digestion Process with Biofilm-Based Pretreatment." Processes 11, no. 3 (2023): 655. http://dx.doi.org/10.3390/pr11030655.

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The production of biogas from food waste is a good approach to the minimization of food waste and increase in the production of renewable energy. However, the use of food waste as a feedstock for biogas production currently poses a difficulty due to an ineffective hydrolysis process, which is a pretreatment procedure and the initial step of the biogas conversion process. This restriction results from the food waste polymers’ solubilization and breakdown. This has an impact on the volume of biogas produced during the methanogenesis stage. It is essential to increase the biodegradation of organi

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A, Adewumi, Lasisi K. H, Akinmusere O. K, Ojo A. O, and Babatola J. O. "COMPARATIVE STUDY OF ELECTROLYSIS-ENHANCED ANAEROBIC DIGESTION OF THREE SOLUBLE SOLID WASTES FOR BIOGAS PRODUCTION." INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY 4, no. 1 (2020): 11. http://dx.doi.org/10.25105/urbanenvirotech.v4i1.8004.

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<p><strong>Aim</strong>: A comparative study of biogas production from three soluble solid wastes was conducted under anaerobic conditions by subjecting each waste to both conventional and electrolyzed digesters. <strong>Methodology and Results</strong>: Varying weight of each of the waste was mixed thoroughly with water and fed into five digesters. Three of these digesters were electrolytically-enhanced while the other two were not. The digestion of each of the wastes was monitored for 40 days at an ambient temperature ranging from 24 to 35oC. In all the digester

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Kunte, D. P., T. Y. Yeole, and D. R. Ranade. "Two-stage anaerobic digestion process for complete inactivation of enteric bacterial pathogens in human night soil." Water Science and Technology 50, no. 6 (2004): 103–8. http://dx.doi.org/10.2166/wst.2004.0365.

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Anaerobic digestion offers a good alternative for human waste treatment. However, the fate of enteric bacterial pathogens present in human night soil (HNS) remains a major concern for hygienic safety of the process. A two-stage anaerobic digestion process, consisting of separate acidogenic and methanogenic digesters, was designed and its efficacy in the inactivation of Salmonella typhi was compared to a single-stage digestion process. In a single-stage digestion, complete pathogen inactivation was achieved only in the digesters with high levels of volatile fatty acids (VFA ≅18,000 mg/l) and ac

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Negara, I. Gede Artha, Daud Simon Anakottapary, Ida Bagus Gde Widiantara, Luh Putu Ike Midiani, Tjokorda Gde Tirta Nindhia, and I. Gusti Ngurah Nitya Santhiarsa. "Integrated microcontroller mq sensors for monitoring biogas: Advancements in methane and hydrogen sulfide detection." Jurnal Teknosains 13, no. 2 (2024): 140. http://dx.doi.org/10.22146/teknosains.91936.

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Recent technological advances in microcontroller systems enable novel biogas monitoring capabilities. This study investigates microcontroller-based quantification of methane and hydrogen sulfide concentrations in biogas derived from anaerobic digestion. Anaerobic digesters were fed either 100% cow dung substrates or a 50:50 mixture of cow dung with municipal solid waste (MSW). Methane levels were monitored using an MQ-4 sensor, hydrogen sulfide via an MQ-136 sensor, and temperature with a K-type thermocouple, all integrated with an ATmega 2560 microcontroller system. The 100% cow dung digester

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Tauber, J., V. Parravicini, K. Svardal, and J. Krampe. "Quantifying methane emissions from anaerobic digesters." Water Science and Technology 80, no. 9 (2019): 1654–61. http://dx.doi.org/10.2166/wst.2019.415.

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Abstract In this research, sources of methane emissions of an anaerobic digester (AD) system at a municipal wastewater treatment plant (WWTP) with 260,000 population equivalent (PE) capacity were detected by a non-dispersive infrared (NDIR) camera. The located emissions were evaluated qualitatively and were documented with photographs and video films. Subsequently, the emission sources were quantified individually using different methods like the Flux-Chamber method and sampling from the digester's circulation pipe. The dissolved methane in the sludge digester was measured via gas chromatograp

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