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Journal articles on the topic 'Phosphoric sludges'

Author: Grafiati

Published: 23 November 2024

Last updated: 31 July 2025

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1

Khassenov, A. K., U. B. Nussupbekov, D. Zh Karabekova, S. S. Kassymov, M. M. Bolatbekova, and M. Stoev. "Investigation of the effect of electro-hydraulic pulses on the combustion process of phosphorus sludge." Bulletin of the Karaganda University. "Physics" Series 100, no. 4 (2020): 71–77. http://dx.doi.org/10.31489/2020ph4/71-77.

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The article considers the influence of electro-hydraulic pulses on the combustion of phosphorus sludge. Electric discharges in the environment of phosphorus sludge are sources of shock waves, which destroying the structure of phosphorus sludge and contribute to the intensification of the combustion process. A distinctive feature of the electro-hydraulic effect is the ability to control the parameters of pressure waves over a fairly wide range using the characteristics of the electric discharge circuit. For determine the optimal productivity and purity of the final product of the electric disch

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2

Fukase, T., M. Shibata, and Y. Miyaji. "The Role of an Anaerobic Stage on Biological Phosphorus Removal." Water Science and Technology 17, no. 2-3 (1985): 69–80. http://dx.doi.org/10.2166/wst.1985.0120.

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A detailed study was conducted on biological removal of phosphorus by an activated sludge process composed of an anaerobic stage followed by an aerobic stage in order to clarify the role of the anaerobic stage of the process. Two distinctive sludges, one contained approximately 10 percent phosphorus, most of which existed in the form of polyphosphates, and the other contained 1.9 percent phosphorus, were obtained by changing BOD concentration of influent and hydraulic detention time of the process. Although the polyphosphate-containing sludge released phosphorus in proportion to the absorbed B

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3

Erdincler, A., and L. D. Seyhan. "Agricultural use of municipal wastewater sludges: phosphorus availability of biological excess phosphorus removal sludges." Water Science and Technology 54, no. 5 (2006): 131–38. http://dx.doi.org/10.2166/wst.2006.555.

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Reuse of sewage sludges as phosphorus fertiliser requires the estimation of the plant availabilities of phosphorus (P) from different sludges. This study investigates the effect of lime stabilisation on the phosphorus availability from biological phosphorus removal sludges. In the first part of the study, pot experiments were carried out to assess the fertilising effect of a dewatered biological phosphorus removal sludge. Availability of P was determined in terms of plant-uptake. In the second part of the study, incubation tests were carried out to observe the change in the available P with ti

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4

Bond, Philip L., Jürg Keller, and Linda L. Blackall. "Bio-P and non-bio-P bacteria identification by a novel microbial approach." Water Science and Technology 39, no. 6 (1999): 13–20. http://dx.doi.org/10.2166/wst.1999.0249.

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Culturing bacteria from activated sludge with enhanced biological phosphorus removal (EBPR) has strongly implicated Acinetobacter with the process. However, using fluorescent in-situ hybridisation (FISH) probing to analyse microbial populations, we have shown evidence opposing this widespread belief. We describe the phosphorus (P) removing performance and microbial population analyses of sludges obtained in a laboratory scale EBPR reactor. Two sludges with extremely high P removing capabilities were examined, the P content of these sludges was 8.6% (P sludge) and 12.3% (S sludge) of the MLSS.

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5

Trpčevská, Jarmila, Gréta Maruškinová, Martina Laubertová, Klaudia Kundráková, and Dušan Oráč. "Industrial Sludge Valorization in Soil Application." Metals 15, no. 1 (2025): 55. https://doi.org/10.3390/met15010055.

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Sludges produced in the pickling line in a steel company were applied to the soil as a secondary source of nutrients. In the experiments, the addition of two types of sludge, namely neutralization sludge (NS) and phosphatization sludge (PS), was evaluated. The listed sludges are defined as non-hazardous waste and contain elements such as iron, phosphorus, zinc, and others in minor quantities. The primary motivation for using these sludges in the soil is their phosphorus content, as phosphorus is a crucial mineral nutrient. Leaf lettuce was used as a test object. The quality of the soil in whic

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6

Tonkovic, Zlatko. "Aerobic stabilisation criteria for BNR biosolids." Water Science and Technology 38, no. 2 (1998): 133–41. http://dx.doi.org/10.2166/wst.1998.0123.

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A research program was undertaken to establish the stability of waste activated sludge generated from seven activated sludge treatment plants, both nutrient removal and conventional, and determine what further treatment is required to produce a substantially stabilised (ie. non-odorous) sludge. It has been previously thought that waste activated sludge from extended aeration plants (sludge age of approximately 25 days) was sufficiently stabilised to permit dewatering and stockpiling without odour generation. However, experience at a number of treatment plants with large unaerated mass fraction

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7

Tonkovic, Zlatko. "Aerobic stabilisation criteria for BNR biosolids." Water Science and Technology 39, no. 6 (1999): 167–74. http://dx.doi.org/10.2166/wst.1999.0290.

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A research program was undertaken to establish the stability of waste activated sludge generated from several activated sludge treatment plants, both nutrient removal and conventional, and determine what further treatment is required to produce a substantially stabilised (ie. non-odorous) sludge. It has been previously thought that waste activated sludge from extended aeration plants (sludge age of approximately 25 days) was sufficiently stabilised to permit dewatering and stockpiling without odour generation. However, experience at a number of treatment plants with large unaerated mass fracti

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8

Giacobbo, Francesca, Mirko Da Ros, Elena Macerata, and Eros Mossini. "A case study of management and disposal of TENORMs: radiological risk estimation by TSD Dose and RESRAD-ONSITE." AIMS Environmental Science 8, no. 5 (2021): 465–80. http://dx.doi.org/10.3934/environsci.2021030.

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<abstract> <p>Naturally Occurring Radioactive Materials (NORMs) and Technologically Enhanced NORMs (TENORMs) are among the principal sources of radiation exposure for humans and for the environment. Therefore, the assessment of the impact of NORMs and TENORMs waste on human health is a key issue for their management and for acceptance of disposal sites. The radiological doses to workers and public due to TENORMs disposal depend on the waste inventory, on the usage of the site during operational activities and post closure phase and on the presence of dwelling areas in the vicinity

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9

Stypka, T., E. Plaza, A. Stypka, J. Trela, and B. Hultman. "Regional planning and product recovery as tools for sustainable sludge management." Water Science and Technology 46, no. 4-5 (2002): 389–96. http://dx.doi.org/10.2166/wst.2002.0633.

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The article presents two aspects of sludge management: regional planning and product recovery. The introduction of these two elements can reduce the cost, close the ecocycle and make the management more sustainable. A spreadsheet program to optimize the regional location of different facilities is presented. The simple example shows the potential of the model. The brief comparison of formal problems concerning sludge disposal in Poland and Sweden is also discussed. Requirements of phosphorus recovery and recycling of phosphorus to the phosphate industry make sludge fractionation in combination

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10

Li, Qianlan, Qingdan Wu, Xiaochen Zheng, et al. "The Conversion and Migration Behavior of Phosphorus Speciation During Pyrolysis of Different Sludges." AIMS Environmental Science 11, no. 1 (2024): 1–20. http://dx.doi.org/10.3934/environsci.2024001.

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<abstract> <p>The study was enforced to probe the conversion and migration behavior of phosphorus speciation in sludge and the biochar received from pyrolysis of municipal sludge (MS), town sludge (TS), and slaughterhouse sludge (SS). This study creatively used fractionation of soil phosphorus to further differentiate speciation of phosphorus in three sludges (MS, TS, and SS). According to the x-ray diffraction (XRD) analysis and sequential extraction, the study proved the dependence of P speciation conversion on pyrolysis temperature and different types of raw sludge. The results

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11

Crocetti, Gregory R., Philip Hugenholtz, Philip L. Bond, et al. "Identification of Polyphosphate-Accumulating Organisms and Design of 16S rRNA-Directed Probes for Their Detection and Quantitation." Applied and Environmental Microbiology 66, no. 3 (2000): 1175–82. http://dx.doi.org/10.1128/aem.66.3.1175-1182.2000.

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ABSTRACT Laboratory-scale sequencing batch reactors (SBRs) as models for activated sludge processes were used to study enhanced biological phosphorus removal (EBPR) from wastewater. Enrichment for polyphosphate-accumulating organisms (PAOs) was achieved essentially by increasing the phosphorus concentration in the influent to the SBRs. Fluorescence in situ hybridization (FISH) using domain-, division-, and subdivision-level probes was used to assess the proportions of microorganisms in the sludges. The A sludge, a high-performance P-removing sludge containing 15.1% P in the biomass, was compri

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12

Gorazda, Katarzyna, Zygmunt Kowalski, and Zbigniew Wzorek. "From sewage sludge ash to calcium phosphate fertilizers." Polish Journal of Chemical Technology 14, no. 3 (2012): 54–58. http://dx.doi.org/10.2478/v10026-012-0084-3.

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Our work presents the results of the research on the utilization of ashes after sewage sludge combustion comprising phosphorus recovery in the form of useful products. The investigations were divided into three parts: selecting the combustion parameters of sewage sludge, examining ash leaching with mineral acids (nitric and phosphoric) to high phosphorus selectivity assuring a low content of iron and heavy metals in the extracted solutions and precipitation of CaHPO4 .2H2O. Suitable temperature of a sewage sludge combustion enables selective extraction of phosphorus compounds from ash because

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13

Sudiana, I. M., T. Mino, H. Satoh, and T. Matsuo. "Morphology, In-Situ characterization with rRNA targetted probes and respiratory quinone profiles of enhanced biological phosphorus removal sludge." Water Science and Technology 38, no. 8-9 (1998): 69–76. http://dx.doi.org/10.2166/wst.1998.0792.

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The microbial communities in activated sludge acclimated with either acetate or glucose as the major carbon source under phosphorus limited or rich conditions were investigated morphologically, phylogenetically and chemotaxonomically. The sludge with a minimized polyphosphate content was dominated by tetrad shaped bacteria, which were suspected to be ‘glycogen accumulating bacteria (GAOs) or G bacteria’ The sludge containing high polyphosphate was dominated by cluster forming coccus bacteria. Quinone analyses suggested that all the sludge tested contained various ubiquinones and menaquinones,

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14

T'Seyen, J., D. Malnou, J. C. Block, and G. Faup. "Polyphosphate Kinase Activity during Phosphate Uptake by Bacteria." Water Science and Technology 17, no. 11-12 (1985): 43–56. http://dx.doi.org/10.2166/wst.1985.0220.

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Polyphosphate kinase, one of the key enzymes for polyphosphate accumulation in bacteria, has been investigated in pure culture and activated sludge samples. Three bacterial species (Acinetobacter lwoffi, A. phosphadevorus and Pseudomonas fluorescens) appeared to have a polyphosphate kinase activity (between 0.3 and 4.7 nM of P04 transferred per minute and per mg of proteins). However tests carried out on Aeromonas hydrophila, Bacillus subtilis, E. coli and Serratia sp. showed these species did not have any measurable polyphosphate kinase activity. Enzyme activity in bacteria is dependent on en

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15

Oosthuizen, D. J., and T. E. Cloete. "SEM-EDS for determining the phosphorus content in activated sludge EPS." Water Science and Technology 43, no. 6 (2001): 105–12. http://dx.doi.org/10.2166/wst.2001.0351.

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Not all phosphorus removed in activated sludge systems can be accounted for by polyphosphate accumulating organisms (PAO). A method for the qualitative and quantitative in situ characterization of PAO cell clusters and closely associated extracellular polysaccharides (EPS) is described. X-ray microanalysis was performed on samples from four activated sludge plants situated in Pretoria, South Africa. Analyses were done by means of Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectrometry (EDS). Cell clusters with associated EPS on average contained between 57 and 59% phosp

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16

Wilmes, P., and P. L. Bond. "Towards exposure of elusive metabolic mixed-culture processes: the application of metaproteomic analyses to activated sludge." Water Science and Technology 54, no. 1 (2006): 217–26. http://dx.doi.org/10.2166/wst.2006.390.

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Protein expression is a direct reflection of specific microbial activities in any ecosystem. In order to assess protein expression in mixed microbial communities, the feasibility of applying proteomic techniques to activated sludge samples has recently been demonstrated. We report the application of metaproteomics to two activated sludges from a laboratory-scale sequencing batch reactor with dissimilar phosphorus removal performances. Fluorescence in situ hybridization (FISH) revealed that the sludge with good enhanced biological phosphorus removal performance (EBPR) was dominated by Betaprote

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17

Liang, Haijun, Patrick Zhang, Zhen Jin, and David DePaoli. "Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock." Minerals 8, no. 9 (2018): 416. http://dx.doi.org/10.3390/min8090416.

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Phosphorite, or phosphate rock, is the raw material of phosphoric acid production. It has also been regarded as the most important secondary rare earth element (REE) resource due to low contents of rare earth elements contained in the ore. In Florida, there is about 19 Mt of phosphate rock mined annually. After beneficiation, the phosphate rock concentrate is utilized to produce phosphoric acid via a wet-process in which sulfuric acid is used to digest phosphate. During these processes, REEs and some phosphorus get lost in the byproducts including phosphatic clay, flotation tailings, phosphogy

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McMahon, K. D., D. Jenkins, and J. D. Keasling. "Polyphosphate kinase genes from activated sludge carrying out enhanced biological phosphorus removal." Water Science and Technology 46, no. 1-2 (2002): 155–62. http://dx.doi.org/10.2166/wst.2002.0471.

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The community structure and metabolic function of activated sludge carrying out enhanced biological phosphorus removal have been investigated. Laboratory-scale sequencing batch reactors were operated at several influent COD/P ratios to obtain sludges with a range of phosphorus contents. Molecular microbiological techniques based on small subunit ribosomal RNA were used to characterize the community structure of these sludges. The dominant polyphosphate accumulating organism was a close relative of Rhodocyclus tenuis, a member of the β subclass of the Proteobacteria. Fragments of genes coding f

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19

Ichihashi, O., H. Satoh, and T. Mino. "Sludge–sludge Interaction in the Enhanced Biological Phosphorus Removal Process." Water Science and Technology 53, no. 6 (2006): 1–6. http://dx.doi.org/10.2166/wst.2006.161.

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Metabolisms related to enhanced biological phosphorus removal (EBPR) were found to be affected when two activated sludges with different EBPR activities were mixed together. In the present study, two laboratory scale EBPR processes were operated in parallel, one of them with higher and another with lower EBPR activities. The activated sludges from the two reactors were mixed together at different mixing ratios. The supernatant was made the same for all mixing ratios, anaerobic–aerobic batch experiments were performed, and acetate uptake rate and phosphate release rate under anaerobic condition

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20

Hagare, Dharmappa, Woo Taek Hong, Zuhaib Siddiqui, Sai Kiran Natarajan, and Julian Fyfe. "Effect of Dairy Pond Sludge/Supernatant Application on Ryegrass Dry Matter Yield and Phosphorus Fractions in Soil." Agriculture 12, no. 3 (2022): 351. http://dx.doi.org/10.3390/agriculture12030351.

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Pasture yield in dairy grazing systems is critical to supplying sufficient feed for milking cows and maintaining productivity. In the Australian dairy industry, ryegrass and clover are common grasses used in grazed pastures. Dairy shed effluent (DSE), the wastewater produced from washing down the dairy holding yards during and after milking, is generally managed through application to pasture as a fertilizer substitute/supplement following partial treatment in stabilization ponds. The aim of this study is to assess the benefits of applying sludge and supernatant collected from two-stage DSE po

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21

Nazarbek, Ulzhalgas, Perizat Abdurazova, Saule Nazarbekova, Yerkebulan Raiymbekov, and Maksat Kambatyrov. "Processing of Phosphoric Solid Waste by Humic Acid Leaching Method." Inorganics 11, no. 3 (2023): 90. http://dx.doi.org/10.3390/inorganics11030090.

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This article presents the results of research on the leaching of solid phosphorus-containing waste with humic acid. Such waste includes the by-products of the electrothermal processing of phosphate raw materials—phosphorus sludge and cottrel dust. Chemical and X-ray diffraction analyses have been used to study their composition and phase structure, according to which these substances have an amorphous structure. The leaching of phosphoric sludge and cottrel dust was investigated by varying the main parameters. The obtained data were processed using the method of formal kinetics to study the fe

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Parés Viader, Raimon, Pernille Erland Jensen, Lisbeth M. Ottosen, Tobias P. Thomsen, Jesper Ahrenfeldt, and Henrik Hauggaard-Nielsen. "Comparison of phosphorus recovery from incineration and gasification sewage sludge ash." Water Science and Technology 75, no. 5 (2016): 1251–60. http://dx.doi.org/10.2166/wst.2016.620.

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Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ashes, a material that is rich in phosphorus, but which is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock supply, phosphorus recovery from sewage sludge ashes has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms

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Seyhan, D., and A. Erdincler. "Effect of lime stabilisation of enhanced biological phosphorus removal sludges on the phosphorus availability to plants." Water Science and Technology 48, no. 1 (2003): 155–62. http://dx.doi.org/10.2166/wst.2003.0041.

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This study investigates the phosphorus (P) availability in lime stabilised biological phosphorus removal sludges. Lime-stabilised sludge amendments (LS), non-stabilised sludge amendments (S) and amendments with a chemical fertiliser (TSP) were compared through plant uptake of P and Olsen-extractable P for this purpose. In the first part of the study, pot experiments were performed, where a dewatered biological phosphorus removal sludge was applied to pots at increasing rates of P. A P-deficient, alkaline soil was used in the experiments and Lollium perenne was the testing plant. In the second

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Chukwudebelu, Jane Adamma, and Jonah Agunwamba. "Effect of Different Types of Chemicals, Cooking Time and Chemical Concentration on the Quality of Sludge and Pulp Appearance." Asian Journal of Chemical Sciences 13, no. 1 (2023): 46–55. http://dx.doi.org/10.9734/ajocs/2023/v13i1232.

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Pulp and paper production process releases different types of wastes into the environment and pulp mill sludge is one of the major wastes from pulp and paper mill. The environmental awareness has led to more attention being given to the process of paper production and the raw materials and chemical usage. In this study, we analyzed the effect of chemical, concentration and cooking time on the characteristics of sludge and physical appearance of pulp obtained from pulping kenaf stem. The stem was pulped with 20%, 60% and 90% concentrations of formic acid and sodium hydroxide at 1 hour, 2 hours

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Stürmer, Bernhard, and Melanie Waltner. "Best Available Technology for P-Recycling from Sewage Sludge—An Overview of Sewage Sludge Composting in Austria." Recycling 6, no. 4 (2021): 82. http://dx.doi.org/10.3390/recycling6040082.

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In order to close the phosphorus cycle in the long term, efficient recycling processes are necessary to ensure that this critical nutrient can be returned to arable land. Sewage sludge recycling is of particular importance due to the relatively high phosphorus content of sewage sludge. In this article, the current recycling paths of Austrian sewage sludge are highlighted, focusing on the advantages and limitations of sewage sludge composting. In addition to nutrient contents, pollutant loads were also analyzed in order to also discuss the limitations of this recycling pathway. Therefore, data

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Novak, John T., and Chang Min Park. "The effect of iron and aluminium for phosphorus removal on anaerobic digestion and organic sulfur generation." Water Science and Technology 62, no. 2 (2010): 419–26. http://dx.doi.org/10.2166/wst.2010.300.

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The addition of iron or aluminium into activated sludge basins for phosphorus removal is likely to impact both the efficiency of the anaerobic digestion process and the generation of odor-causing compounds following digestion and dewatering. In this study, the impact of iron and aluminium addition on digestion and odor-causing compounds was investigated by using batch digestion of combined primary and waste activated sludge. It was found that aluminium addition resulted in a decrease in volatile solids destruction by anaerobic digestion of approximately 2%. Of the 7 sludges tested, 5 showed a

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Daneshgar, Saba, Armando Buttafava, Doretta Capsoni, Arianna Callegari, and Andrea Capodaglio. "Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges." Resources 7, no. 4 (2018): 71. http://dx.doi.org/10.3390/resources7040071.

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Phosphorus is an essential nutrient for plants, which use it as a basic fertilizer component and is expected to increase significantly in the coming years due to higher food crops demand. Unfortunately, the available phosphorus natural reserves are not renewable, and estimates indicate their rapid decline in the future. Urban wastewater, due to its abundance and relatively high phosphorus content, is an excellent candidate for phosphorus recovery, while the element’s removal from urban effluents was introduced in the 1970′s to limit the undesired effects of eutrophication. In this study, the p

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Fawwaz Akhdan Praditya and Rizka Novembrianto. "Potensi Pemanfaatan Limbah Endapan Asam Fosfat dan Limbah Kapur ZA II sebagai Bahan Baku Pembuatan Pupuk SP – 15." Venus: Jurnal Publikasi Rumpun Ilmu Teknik 3, no. 1 (2025): 115–30. https://doi.org/10.61132/venus.v3i1.723.

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This study explores the potential utilization of phosphoric acid sludge and ZA II lime waste as raw materials for the production of SP-15 fertilizer, which is essential for enhancing agricultural productivity and addressing environmental issues related to waste disposal. The research aims to analyze the phosphorus content (P₂O₅), moisture levels, sulfur (S), and calcium oxide (CaO) in the raw materials and the final fertilizer product. Methods employed include sampling, gravimetric analysis, and spectrophotometry. The findings indicate that phosphoric acid sludge contains an average P₂O₅ conte

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Arrobas, Margarida, Ramily Meneses, Andressa Gribler Gusmão, Julieta Moreira da Silva, Carlos Manuel Correia, and Manuel Ângelo Rodrigues. "Nitrogen-Rich Sewage Sludge Mineralized Quickly, Improving Lettuce Nutrition and Yield, with Reduced Risk of Heavy Metal Contamination of Soil and Plant Tissues." Agronomy 14, no. 5 (2024): 924. http://dx.doi.org/10.3390/agronomy14050924.

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Sewage sludge should primarily find use in agriculture, reducing the quantity directed towards alternative disposal methods like incineration or deposition in municipal landfills. This study evaluated the agronomic value and the risk of soil and plant tissue contamination with heavy metals in sewage sludge obtained from two wastewater treatment plants (WWTP). The experiment was arranged as a 2 × 5 factorial (two sewage sludges, five sanitation treatments), involving lettuce cultivation in pots over two growing cycles. The two sewage sludges were sourced from the WWTPs of Gelfa and Viana do Cas

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Bruus, Jacob H., Jimmy R. Christensen, and Hanne Rasmussen. "Anaerobic Storage of Activated Sludge: Effects on Conditioning and Dewatering Performance." Water Science and Technology 28, no. 1 (1993): 109–16. http://dx.doi.org/10.2166/wst.1993.0028.

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Since dewatering equipment is commonly operated only during normal working hours, activated sludge must often be stored in an anaerobic condition prior to conditioning. It is the objective of this study to investigate the influence of anaerobic storage on conditioning requirements and dewatering performance on a laboratory scale. Sludges were collected at two large treatment plants (removal of organic matter, nitrogen and phosphorus) and one small treatment plant (removal of organic matter). Thickened activated sludges from the three wastewater treatment plants were stored anaerobically in the

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Magdalena, Jastrzębska, Kostrzewska Marta, Treder Kinga, et al. "Fertiliser from sewage sludge ash instead of conventional phosphorus fertilisers?" Plant, Soil and Environment 64, No. 10 (2018): 504–11. http://dx.doi.org/10.17221/347/2018-pse.

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Recycling of phosphorus (P) from municipal waste for the use as a fertiliser can be an alternative to the non-renewable resources of this element as well as a method in the management of civilisation by-products that are a burden to the environment. An innovative phosphorus suspension fertiliser, produced on the basis of ash from incineration of sewage sludge and phosphorus solubilising bacteria Bacillus megaterium was compared in field trials with spring wheat conducted in 2014 and 2015 with superphosphate and phosphorite. The new fertiliser was not inferior to the commercial fertilisers in t

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Jang, Gyoung Gug, Joshua A. Thompson, Pimphan Aye Meyer, Patrick Zhang, Ziheng Shen, and Costas Tsouris. "Technoeconomic Assessment of Phosphoric Acid and Rare Earth Element Recovery from Phosphoric Acid Sludge." Sustainability 16, no. 16 (2024): 6984. http://dx.doi.org/10.3390/su16166984.

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Sustainability faces many challenges, including the availability of materials necessary for technological advancement. Rare earth elements (REEs), for example, are key materials for several manufacturing industries that can unlock renewable energy and sustainable development. In this study, a decanter centrifuge has been employed to successfully separated phosphoric acid and REE-containing particles from phosphoric acid sludge with concentrations ranging from 1000 to 2200 ppm REEs. Operating efficiently with up to 35 wt.% solids, the centrifuge was demonstrated to achieve approximately 95% pho

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Bridle, T. R., and D. Pritchard. "Energy and nutrient recovery from sewage sludge via pyrolysis." Water Science and Technology 50, no. 9 (2004): 169–75. http://dx.doi.org/10.2166/wst.2004.0562.

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Energy recovery and nutrient reuse from sewage sludge has traditionally been achieved via anaerobic digestion/power generation with land application of the biosolids. By contrast, thermal processes such as pyrolysis have typically been used only for energy recovery. One such technology has demonstrated at commercial scale that all of the energy in sludge can be beneficially recovered and reused. No attempt was however made to recover and reuse sludge nutrients. There are many potential benefits of using pyrolysis for both energy and nutrient recovery. Firstly, unlike digestion, the principal e

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Ghosh, S., and D. C. Taylor. "Kraft-Mill Biosolids Treatment by Conventional and Biphasic Fermentation." Water Science and Technology 40, no. 11-12 (1999): 169–77. http://dx.doi.org/10.2166/wst.1999.0709.

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Kraft primary and mixed primary-activated sludges were gasified by thermophilic (50 °C) high-rate and mesophilic two-phase digestion. Kraft sludges were deficient in nitrogen, phosphorus, and other unidentified nutrients. Municipal sludge proved to be a much better nutrient source than inorganic salts. Performance of the mesophilic (35°C), two-phase anaerobic digestion (TPAD) system was about the same as that of thermophilic single-stage, high-rate digestion at a 10-day HRT as judged in terms of methane yield (0.17 SCM/kg VS added) and VS reduction efficiency (43%). The mesophilic TPAD process

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Yuxin, Zhao, Wang Liang, Yu Helong, Jiang Baojun, and Jiang Jinming. "Comparison of sludge treatment by O3 and O3/H2O2." Water Science and Technology 70, no. 1 (2014): 114–19. http://dx.doi.org/10.2166/wst.2014.185.

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This work focuses on the comparison of sludge decomposition caused by ozone (O3) alone and by ozone/hydrogen peroxide (O3/H2O2). The content of carbonaceous organic materials, nitrogenous compounds and phosphoric substances in sludge supernatant were measured. The release of soluble chemical oxygen demand, total nitrogen (TN) and total phosphorus (TP) caused by O3/H2O2 treatment were more than by O3 alone. As a result, it can be concluded that the efficiency of sludge breakup in O3/H2O2 was better than that in O3 alone. However, a peak appeared in both systems for the biodegradable substances

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Kuba, T., A. Wachtmeister, M. C. M. van Loosdrecht, and J. J. Heijnen. "Effect of nitrate on phosphorus release in biological phosphorus removal systems." Water Science and Technology 30, no. 6 (1994): 263–69. http://dx.doi.org/10.2166/wst.1994.0277.

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The effect of nitrate on phosphorus release by biological phosphorus removing organisms has been studied. Denitrifying (DPB) or aerobic phosphorus removing bacteria were enriched in an anaerobic-anoxic or anaerobic-aerobic sequencing batch reactor (SBR). The enrichment sludges were used in batch tests, in which the effect of simultaneous presence of substrate (HAc) and nitrate was studied on the phosphorus release. It could be concluded that a reduction of the phosphorus release by nitrate in biological phosphorus removal systems is partly due to the presence of DPB, which utilize HAc for deni

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McMahon, Katherine D., Michael A. Dojka, Norman R. Pace, David Jenkins, and Jay D. Keasling. "Polyphosphate Kinase from Activated Sludge Performing Enhanced Biological Phosphorus Removal." Applied and Environmental Microbiology 68, no. 10 (2002): 4971–78. http://dx.doi.org/10.1128/aem.68.10.4971-4978.2002.

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ABSTRACT A novel polyphosphate kinase (PPK) was retrieved from an uncultivated organism in activated sludge carrying out enhanced biological phosphorus removal (EBPR). Acetate-fed laboratory-scale sequencing batch reactors were used to maintain sludge with a high phosphorus content (approximately 11% of the biomass). PCR-based clone libraries of small subunit rRNA genes and fluorescent in situ hybridization (FISH) were used to verify that the sludge was enriched in Rhodocyclus-like β-Proteobacteria known to be associated with sludges carrying out EBPR. These organisms comprised approximately 8

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Obarska-Pempkowiak, H., A. Tuszyńska, and Z. Sobociński. "Polish experience with sewage sludge dewatering in reed systems." Water Science and Technology 48, no. 5 (2003): 111–17. http://dx.doi.org/10.2166/wst.2003.0294.

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Macrophyte plants e.g. reed, cattails, bulrush, can be applied to sewage sludge utilisation. One of the first facilities of this type in the Gdansk region (Northern Poland) was established in Darzlubie in 1995 and primary sludge has been utilised in reed beds there. The objective of the undertaken research was evaluating the influence of sewage sludge storage on its chemical and biological properties. A total of 5.5 m thick layer of primary, anaerobically stabilised sludge (moisture 90-96%) was loaded to the reed bed during 6 years of operation. As a consequence of dewatering and biochemical t

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Degu, Adise, Tesfaye Shiferaw, and Tesfaye Feyisa. "Assessment of Physio-Chemical Properties of Bahir Dar Textile Sludge and Its Impact on The Growth of Lettuce (Lactuca Sativa) and Soil Nutrient Improvement." Journal of Tropical Crop Science 12, no. 01 (2025): 25–36. https://doi.org/10.29244/jtcs.12.01.25-36.

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Textile produces large volumes of sludge due to industrial activity, and its disposal is a serious environmental concern because it includes toxic contaminants, including heavy metals. Due to its vast volume and mass, sludge management is seen as an additional burden to the industry. This study aims to characterize solid sludge from the textile industry. The sludge’s pH, organic matter (OM), nutrient elements (N, P, K), and metal content were determined using appropriate analytical techniques. Treatment consisted of 4×3 factorial combinations of nitrogen and phosphorus, i.e., full recommended

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Kindzierski, Warren B., and Steve E. Hrudey. "Effects of phosphorus removal chemicals upon methane production during anaerobic sludge digestion." Canadian Journal of Civil Engineering 13, no. 1 (1986): 33–38. http://dx.doi.org/10.1139/l86-005.

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Aluminum sulphate (alum) and ferric chloride are commonly employed to aid phosphorus removal in wastewater treatment. Previous studies have indicated that these chemical coagulants produce sludges that adversely affect anaerobic digestion. The objective of this study was to assess the magnitude of the effects chemical coagulants have upon methane generation in anaerobic digestion. Methane production was monitored and concentrations of aluminum or iron present during batch digestion of chemically precipitated sludge were measured.Both alum and ferric chloride addition to activated sludge produc

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Al-Thyabat, S., and P. Zhang. "REE extraction from phosphoric acid, phosphoric acid sludge, and phosphogypsum." Mineral Processing and Extractive Metallurgy 124, no. 3 (2015): 143–50. http://dx.doi.org/10.1179/1743285515y.0000000002.

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Alvarenga, Emilio, Anne Falk Øgaard, and Lasse Vråle. "Effect of anaerobic digestion and liming on plant availability of phosphorus in iron- and aluminium-precipitated sewage sludge from primary wastewater treatment plants." Water Science and Technology 75, no. 7 (2017): 1743–52. http://dx.doi.org/10.2166/wst.2017.056.

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More efficient plant utilisation of the phosphorus (P) in sewage sludge is required because rock phosphate is a limited resource. To meet environmental legislation thresholds for P removal from wastewater (WW), primary treatment with iron (Fe) or aluminium (Al) coagulants is effective. There is also a growing trend for WW treatment plants (WWTPs) to be coupled to a biogas process, in order to co-generate energy. The sludge produced, when stabilised, is used as a soil amendment in many countries. This study examined the effects of anaerobic digestion (AD), with or without liming as a post-treat

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Nussupbekov, B. R. "ELECTROHYDRAULIC METHOD FOR PROCESSING OF THE PHOSPHORUSCONTAINING SLUDGES." Eurasian Physical Technical Journal 19, no. 1 (39) (2022): 99–104. http://dx.doi.org/10.31489/2022no1/99-104.

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The creation of an effective method for processing toxic waste from phosphorus production, as well as the suppression of the sludge formation process itself, are still relevant. This article discusses a method for processing toxic phosphorus sludge using electro hydraulic impulses. The phosphorus sludge structures before and after treatment with electric discharges are shown. The histograms of the distribution of phosphorus sludge particles by size after processing with electrohydraulic pulses are considered. It's established the content of large droplets is low and on the contrary the high co

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Dong, Qirong, Martha Dagnew, Jeff Cumin, and Wayne Parker. "Preliminary evaluation of biosolids characteristics for anaerobic membrane reactors treating municipal wastewaters." Water Science and Technology 72, no. 8 (2015): 1446–54. http://dx.doi.org/10.2166/wst.2015.356.

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This study assessed the characteristics of biosolids of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating municipal wastewater. The production of total solids (TS) and volatile solids (VS) was comparable to that reported for the extended aeration system at solids residence time (SRT) longer than 40 days. The yields of TS and VS were reduced as SRT increased from 40 to 100 days and increased with the addition of 26 mg/L of FeCl3. The AnMBR destroyed 60–82% of the VS loading in feed wastewater and hence it was concluded the biosolids met the requirements for vector attraction reductio

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Watanabe, Y., and K. Kimura. "Hybrid membrane bioreactor for water recycling and phosphorus recovery." Water Science and Technology 53, no. 7 (2006): 17–24. http://dx.doi.org/10.2166/wst.2006.203.

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This paper deals with the performance of hybrid membrane bioreactor (MBR) combining the precoagulation/sedimentation and membrane bioreactor. The hybrid MBR not only produces the treated water with excellent permeate quality but also shows much lower membrane fouling than the conventional MBR. It may come from its extremely low F/M ratio to maintain the low viscosity even in the high MLSS concentration range of about 20,000 mg/L. Some results of microbial community analysis in MBRs was conducted to demonstrate the other reason for its lower membrane fouling. Hybrid MBR has a high potential to

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Kowalski, Zygmunt, and Kinga Krupa-Żuczek. "A model of the meat waste management." Polish Journal of Chemical Technology 9, no. 4 (2007): 91–97. http://dx.doi.org/10.2478/v10026-007-0098-4.

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A model of the meat waste management The European Union produces about 18 million tons of waste from meat industry per year. The real danger of the BSE disease caused a necessity of looking for a new alternative solution of meat waste management. The proposed solution of meat industry waste management would create meat production waste free with the use of the cleaner production method. Cleaner production includes: pollution prevention, reduction of the source, recovery of materials and energy (for example: the recovery of blood plasma and protein hydrolisate from bone sludge) and their recycl

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Touzani, Abdelaziz, Yahya El Hammoudani, Khadija Haboubi, et al. "Characterization of sludge from the Fez wastewater treatment plant." BIO Web of Conferences 109 (2024): 01015. http://dx.doi.org/10.1051/bioconf/202410901015.

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The Fès wastewater treatment plant is of the activated sludge type. It has been in service since 2014, and receives 155,400 cubic meters per day of domestic wastewater from numerous urban and rural communities: Fès, Ras El Ma, Oulad Tayeb and Ain Chkef. On the one hand, this WWTP generates clean, purified water which is discharged into the receiving environment without any harm to the environment, and on the other, it produces huge quantities of residual sludge, i.e. 5,100 t/year. The aim of this study is to characterize the sludge from the Fez wastewater treatment plant, following sludge trea

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Temirov, Uktam, Nodir Doniyarov, Bakhrom Jurakulov, Najimuddin Usanbaev, Ilkhom Tagayev, and Abdurasul Mamataliyev. "Obtaining complex fertilizers based on low-grade phosphorites." E3S Web of Conferences 264 (2021): 04009. http://dx.doi.org/10.1051/e3sconf/202126404009.

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In the study, the process preparation of phosphorus-humus fertilizers based on low-grade Central Kizilkum phosphorites activated using sulfuric acid in the ratio of 30-70% for decomposition of CaCO3 in the phosphorite followed by addition of activated sludge from municipal waster water was investigated.

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Bessarabov, Arkadiy, Tatyana Zakolodina, Roman Sandu, and Gennady Zaikov. "CALS-Technologies in Synthesis of Multiassortmental Manufacturing for Phosphoric Sludge Utilization." Chemistry & Chemical Technology 3, no. 4 (2009): 327–33. http://dx.doi.org/10.23939/chcht03.04.327.

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CALS-projects of sodium phosphite and hypophosphite technologies – products of phosphoric sludge utilization (one of the main wastes of phosphoric industry) were developed. CALS-technology of the flexible two-grocery production was developed based on the theory of the flexible scheme synthesis.

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Huang, Xiaofeng, Yanfu Wei, Tao Zhou, Yangsong Qin, Kunyang Gao, and Xinyue Ding. "Synthesis of tetrakis (hydroxymethyl) phosphonium chloride by high-concentration phosphine in industrial off-gas." Water Science and Technology 68, no. 2 (2013): 342–47. http://dx.doi.org/10.2166/wst.2013.240.

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With increasing consumption of phosphate rock and acceleration of global phosphate production, the shortage of phosphate resources is increasing with the development and utilization of phosphate. China's Ministry of Land and Resources has classified phosphate as a mineral that cannot meet China's growing demand for phosphate rock in 2010. The phosphorus chemical industry is one of the important economic pillars for Yunnan province. Yellow phosphorus production in enterprises has led to a significant increase in the amount of phosphorus sludge. This paper focuses on phosphine generation in the

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