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You searched for: Subject term acidification Remove constraint Subject term: acidification Subject term activated sludge Remove constraint Subject term: activated sludge
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1. Accelerating anaerobic hydrolysis acidification of dairy wastewater in integrated floating-film and activated sludge (IFFAS) by using zero-valent iron (ZVI) composite carriers

Author:
Yanping Shi; Tao Liu; Shuo Chen; Xie Quan
Source:
Biochemical engineering journal 2022 v.177 pp. 108226
ISSN:
1369-703X
Subject:
Comamonas; Methanosarcina; acetate kinase; acidification; activated sludge; anaerobic treatment; biofilm; electron transfer; hydrolysis; iron; methane; methanogens; microbial communities; polyethylene; proteinases; pyruvate synthase; wastewater
Abstract:
... Flocculent sludge system usually shows a low treatment efficiency and bad resistance to the feeding shock in the hydrolysis acidification. Integrated floating-film and activated sludge (IFFAS) is a favored system to resist shock, and zero-valent iron (ZVI) is an attractive material to enhance hydrolysis acidification. In this study, an IFFAS equipped with ZVI composite carriers was used to stably ...
DOI:
10.1016/j.bej.2021.108226

2. Cation exchange resin pretreatment enhancing methane production from anaerobic digestion of waste activated sludge

Author:
Hui Geng; Ying Xu; Linke Zheng; Haoyu Liu; Xiaohu Dai
Source:
Water research 2022 v.212 pp. 118130
ISSN:
0043-1354
Subject:
acidification; activated sludge; anaerobic digestion; biodegradability; biogas; cation exchange resins; hydrolysis; methane; methane production; methanogens; polymers; research; response surface methodology; solubilization; water
Abstract:
... The application of anaerobic digestion (AD) to treat waste activated sludge (WAS) still exhibits some limitations, such as low methane production. In this study, cation exchange resin (CER) pretreatment was explored to enhance the efficiency of the AD of WAS. Based on the response surface methodology, the optimal conditions for CER pretreatment were reaction time of 7.4 h, 33.8 g CER (wet weight) ...
DOI:
10.1016/j.watres.2022.118130

3. Controlling volatile fatty acids production from waste activated sludge by an alginate-degrading consortium

Author:
Zhi-Yi Hu; Shuai Wang; Zi-Qian Geng; Kun Dai; Wen-Xiang Ji; Ye-Chao Tian; Wen-Tao Li; Raymond Jianxiong Zeng; Fang Zhang
Source:
Science of the total environment 2022 v.806 pp. 150730
ISSN:
0048-9697
Subject:
Bacteroides; acetates; acidification; activated sludge; alginates; biodegradation; casein; environment; fermentation; hydrolysis; lactate dehydrogenase; metabolites; polygalacturonic acid; polymers; propionic acid; protein degradation
Abstract:
... It is desirable to control volatile fatty acids (VFAs) recovery from waste activated sludge (WAS) while avoiding the release of N and P. Structural extracellular polymeric substances (St-EPS), with typical components of alginate and polygalacturonic acid, resist the biodegradation of extracellular polymeric substances (EPS) in WAS. Previously, we purposely enriched an alginate-degrading consortium ...
DOI:
10.1016/j.scitotenv.2021.150730

4. Efficient methane production from waste activated sludge and Fenton-like pretreated rice straw in an integrated bio-electrochemical system

Author:
Chun-Xue Yang; Ling Wang; Yi-Jian Zhong; Ze-Chong Guo; Jia Liu; Shao-Peng Yu; Thangavel Sangeetha; Bao-Ling Liu; Chao Ni; Hong Guo
Source:
Science of the total environment 2022 v.813 pp. 152411
ISSN:
0048-9697
Subject:
Acetobacterium; Methanobacterium; Syntrophomonas; acidification; activated sludge; anaerobic digestion; electrolysis; energy; environment; fermentation; hydrolysis; methane production; methanogens; rice straw
Abstract:
... Integrated microbial electrolysis cell-anaerobic digestion (MEC-AD) systems have demonstrated potential advantages for methane production in the presence of small amounts of residual inhibitors. In this study, a series of tests were conducted to analyse the acidification and methanogenesis performance of pretreated rice straw (RS) in anaerobic digestion (AD) and MEC-AD systems after the addition o ...
DOI:
10.1016/j.scitotenv.2021.152411

5. How does the polyhexamethylene guanidine interact with waste activated sludge and affect the metabolic functions in anaerobic fermentation for volatile fatty acids production

Author:
Feng Wang; Yang Wu; Wei Du; Qianqi Shao; Wenxuan Huang; Shiyu Fang; Xiaoshi Cheng; Jiashun Cao; Jingyang Luo
Source:
Science of the total environment 2022 v.839 pp. 156329
ISSN:
0048-9697
Subject:
Desulfobulbus; acetic acid; acidification; activated sludge; aldehyde dehydrogenase; antibiotics; biosynthesis; community structure; environment; fermentation; guanidines; hydrolysis; hygiene; methane production; microbial communities; pollutants; polymers; solubilization
Abstract:
... Antibacterial agents are frequently used to ensure public hygiene. Most of the massively consumed chemicals are discarded and accumulated in waste activated sludge (WAS), which might influence the subsequent anaerobic fermentation process for WAS treatment. This study mainly investigated the impacts of polyhexamethylene guanidine (PHMG, considered as a safe and efficient broad-spectrum antibacteri ...
DOI:
10.1016/j.scitotenv.2022.156329

6. Improved methane production from the two-phase anaerobic digestion and dewaterability of anaerobically digested sludge by β-cyclodextrin pretreatment

Author:
Haixiao Guo; Lixin Tian; Yufen Wang; Tingting Zhu; Yindong Tong; Yiwen Liu
Source:
Journal of cleaner production 2022 v.363 pp. 132484
ISSN:
0959-6526
Subject:
acidification; activated sludge; anaerobic digestion; chemical oxygen demand; hydrolysis; hydrophobicity; methane; methane production; methanogens; solubilization; wastewater; wastewater treatment
Abstract:
... Cyclodextrin-based technologies have drawn worldwide attention for wastewater and sludge treatment due to its extraordinary solubilization of hydrophobic organics. β-cyclodextrin (β-CD) has been applied for enhancing sludge solubilization for production of volatile fatty acids. However, the impact of β-CD on methane production in the anaerobic digestion seemingly was unnoticed in the past, which w ...
DOI:
10.1016/j.jclepro.2022.132484

7. Long-term effects of copper nanoparticles on volatile fatty acids production from sludge fermentation: Roles of copper species and bacterial community structure

Author:
Yuexi Chen; Yang Wu; Yaozhi Bian; Lei Dong; Xiong Zheng; Yinguang Chen
Source:
Bioresource technology 2022 v.348 pp. 126789
ISSN:
0960-8524
Subject:
acidification; activated sludge; bacterial communities; community structure; copper nanoparticles; dose response; fermentation; geographical distribution; hydrolysis; solubilization
Abstract:
... The long-term effects of copper nanoparticles (Cu NPs) on volatile fatty acids (VFAs) production during the waste activated sludge (WAS) fermentation, and the underlying mechanisms regarding copper species distribution and bacterial community evolution were explored. The yield of VFAs in the control was 1086 mg COD/L, whereas those were inhibited by 11.1%, 56.0% and 83.1%, with 25, 50, and 100 mg/ ...
DOI:
10.1016/j.biortech.2022.126789

8. New insights into different surfactants’ impacts on sludge fermentation: Focusing on the particular metabolic processes and microbial genetic traits

Author:
Jingyang Luo; Shiyu Fang; Wenxuan Huang; Feng Wang; Le Zhang; Fang Fang; Jiashun Cao; Yang Wu; Dongbo Wang
Source:
Frontiers of environmental science & engineering 2022 v.16 no.8 pp. 106
ISSN:
2095-2201
Subject:
acidification; activated sludge; bioavailability; biochemical pathways; cetyltrimethylammonium bromide; fermentation; hydrolysis; metagenomics; polysaccharides; sodium dodecylbenzenesulfonate; solubilization; volatile fatty acids
Abstract:
... Surfactants were expected to exhibit positive effects on the waste activated sludge (WAS) disposal. However, the systematic comparison of different categories of surfactants on the WAS fermentation and the functional mechanisms, especially microbial metabolic traits, have not yet been precisely explored. This study revealed the positive effects of different surfactants on the volatile fatty acid ( ...
DOI:
10.1007/s11783-022-1527-6

9. Separation and purification techniques for the recovery of added-value biocompounds from waste activated sludge. A review

Author:
Daniel Núñez; Paula Oulego; Sergio Collado; Francisco A. Riera; Mario Díaz
Source:
Resources, conservation, and recycling 2022 v.182 pp. 106327
ISSN:
0921-3449
Subject:
acidification; activated sludge; biogas; circular economy; energy; growth models; industrial wastewater; liquids; solubilization; sonication; thermal hydrolysis; water treatment
Abstract:
... The need of developing a new growth model based on circular economy has led to an increasing interest in the revalorization of urban and industrial wastewaters in order to use the resources efficiently. The most stablished way of valorising these residues implies the energy production in the form of biomethane. However, urban and industrial wastewaters can also be considered promising raw sources ...
DOI:
10.1016/j.resconrec.2022.106327

10. Simultaneous recovery of vivianite and produce short-chain fatty acids from waste activated sludge using potassium ferrate as pre-oxidation treatment

Author:
Qinxue Wen; Baozhen Liu; Zhiqiang Chen
Source:
Environmental research 2022 v.208 pp. 112661
ISSN:
0013-9351
Subject:
Geobacter; acidification; activated sludge; carbon; fermentation; neutralization; phosphates; potassium; research; wastewater treatment
Abstract:
... Recovery resources from waste active sludge (WAS) is an effective way to alleviate the predicament of WAS disposal, and it is also conducive to the carbon neutralization of wastewater treatment systems. This study discussed the strategy of WAS anaerobic fermentation after pre-oxidation with potassium ferrate (K₂FeO₄, PF), which can simultaneously recover vivianite and enhance SCFAs production. The ...
DOI:
10.1016/j.envres.2021.112661

11. Synergetic effects of biochar addition on mesophilic and high total solids anaerobic digestion of chicken manure

Author:
Simon Kizito; Joseph Jjagwe; Simon Wandera Mdondo; Christine Betty Nagawa; Hamidou Bah; Peter Tumutegyereize
Source:
Journal of environmental management 2022 v.315 pp. 115192
ISSN:
0301-4797
Subject:
acidification; activated sludge; ammonia; ammonium nitrogen; anaerobic digestion; bamboos; batch fermentation; biochar; cation exchange capacity; elemental composition; environmental management; feedstocks; gas production (biological); inoculum; lignocellulose; methane; pH; porosity; poultry manure; rice; surface area; wood
Abstract:
... High solids anaerobic digestion (AD) of chicken manure (CM) is often challenging due to ammonia-N inhibition and accumulation of volatile fatty acids (VFAs). This study evaluated the effect of adding biochars from different feedstock to ameliorate semi-dry AD of fresh CM during batch fermentation. Experiments were performed in 300 mL at two total solid (TS) levels (12% and 15%) under mesophilic (3 ...
DOI:
10.1016/j.jenvman.2022.115192

12. Targeted clean extraction of phosphorus from waste activated sludge: From a new perspective of phosphorus occurrence states to an innovative approach through acidic cation exchange resin

Author:
Yanyan Ding; Xiaohu Dai; Boran Wu; Zhigang Liu; Lingling Dai
Source:
Water research 2022 v.215 pp. 118190
ISSN:
0043-1354
Subject:
acidification; activated sludge; calcium phosphates; cation exchange resins; chemical speciation; orthophosphates; phosphorus; polymers; research; solubility; total phosphorus; water
Abstract:
... Waste activated sludge (WAS) is an important source of non-renewable phosphorus (P) recovery. Given the factor that the occurrence states of phosphorus in WAS determines its recovery efficiency, the spatial distribution and chemical speciation of phosphorus were comprehensively and simultaneously analyzed by in-situ and step-by-step extraction methods for the first time. It was confirmed that the ...
DOI:
10.1016/j.watres.2022.118190

13. Unveiling the dual faces of chitosan in anaerobic digestion of waste activated sludge

Author:
Mengyu Yin; Hongbo Chen
Source:
Bioresource technology 2022 v.344 pp. 126182
ISSN:
0960-8524
Subject:
acidification; activated sludge; anaerobic digestion; chitosan; electron transfer; humus; hydrolases; hydrolysis; methane production; methanogens; polymers
Abstract:
... In this study, the roles of chitosan (CTS) in anaerobic digestion of Waste activated sludge (WAS) were investigated. The results show that the methane production potential of WAS is positively correlated with the CTS content. The presence of 30 g/kg total suspended solids CTS increased the cumulative methane production from 215 ± 1.52 to 272 ± 1.83 mL/g volatile suspended solids. The positively ch ...
DOI:
10.1016/j.biortech.2021.126182

14. Alkylethoxyglucoside-enhanced volatile fatty acids production from waste activated sludge: Performance and mechanisms

Author:
Qinglian Wu; Heshan Zheng; Ying Chen; Min Liu; Xian Bao; Wanqian Guo
Source:
Journal of cleaner production 2021 v.289 pp. 125765
ISSN:
0959-6526
Subject:
acidification; activated sludge; degradation; dosage; enzyme substrates; hydrolysis; methane production; microorganisms; pH; surfactants; volatile fatty acids
Abstract:
... The green and low-cost surfactant Alkylethoxyglucoside (AEG) was used to enhance VFAs production from waste activated sludge (WAS). VFAs production (436.27 ± 14.88 mg COD/g VSS) was improved by ∼6.15 times than the blank under the optimal dosage 0.4 g/g TSS, exceeding most of current enhancement strategies. Thereinto, AEG degradation contributed to ∼15% of total VFAs production, and its primary de ...
DOI:
10.1016/j.jclepro.2020.125765

15. Antimicrobial Properties of a Biocide Based on Quaternary Ammonium Compounds plus Polyhexamethylene Guanidine and Possible Methods for Its Deactivation

Author:
Yu. V. Litti; D. V. Serdyukov; O. V. Kanunnikov; V. A. Akselrod; N. G. Loiko
Source:
Applied biochemistry and microbiology 2021 v.57 no.9 pp. 962-972
ISSN:
0003-6838
Subject:
acidification; activated sludge; alkalinization; anaerobic digestion; antimicrobial properties; biocides; guanidines; methanogens; microbial activity; microbial communities; neutralization; quaternary ammonium compounds; sewage treatment; wastewater
Abstract:
... Biocidal agents (BAs) are widely used in environmentally safe toilet complexes (ESTC) of passenger railcars to suppress microbial activity in fecal sludge (FS). The subsequent disposal of BA-containing FS at municipal sewage treatment facilities adversely affects their work due to the loss of activated sludge. The antimicrobial properties of BAs based on quaternary ammonium compounds (QAC) and pol ...
DOI:
10.1134/S0003683821090052

16. Cationic polyacrylamide alleviated the inhibitory impact of ZnO nanoparticles on anaerobic digestion of waste activated sludge through reducing reactive oxygen species induced

Author:
Baowei Zhang; Xiang Tang; Changzheng Fan; Wanle Hao; Yilin Zhao; Yanjing Zeng
Source:
Water research 2021 v.205 pp. 117651
ISSN:
0043-1354
Subject:
acidification; activated sludge; acute exposure; anaerobes; anaerobic digestion; methane; methanogens; polyacrylamide; reactive oxygen species; research; solubilization; toxicity; water; zinc oxide
Abstract:
... The enrichment of zinc oxide nanoparticles (ZnO NPs) in waste activated sludge (WAS) has raised concerns about their potential impact on anaerobic digestion of WAS. To date, there is no information regarding how to attenuate the negative effects of ZnO NPs on WAS anaerobic digestion. In this study, it was found that the appropriate amount of cationic polyacrylamide (cPAM) could mitigate the toxici ...
DOI:
10.1016/j.watres.2021.117651

17. Correlation and mechanism of extracellular polymeric substances (EPS) on the effect of sewage sludge electro-dewatering

Author:
Yusong Zhang; Bingdi Cao; Ruijun Ren; Yu Shi; Jiaqing Xiong; Weijun Zhang; Dongsheng Wang
Source:
Science of the total environment 2021 v.801 pp. 149753
ISSN:
0048-9697
Subject:
acidification; activated sludge; environment; oxidation; pH; polymers; sewage sludge; sewage treatment; water holding capacity
Abstract:
... Electro-dewatering (ED) is an attractive technology for enhancing dewaterability of waste activated sludge (WAS), and the distribution and composition of EPS and secondary structure of extracellular protein in sludge has a great influence on the sludge dewaterability. Therefore, in order to optimize and regulate sludge ED process, it is necessary to study the influence of EPS components and compos ...
DOI:
10.1016/j.scitotenv.2021.149753

18. Different Pathways of Microplastics Entering the Sludge Treatment System Distinctively Affect Anaerobic Sludge Fermentation Processes

Author:
Wei Wei; Xueming Chen; Bing-Jie Ni
Source:
Environmental science & technology 2021 v.55 no.16 pp. 11274-11283
ISSN:
1520-5851
Subject:
acidification; activated sludge; anaerobes; anaerobic treatment; biological treatment; bioprocessing; fermentation; fermenters; hydrolysis; microplastics; oxidative stress; polyethylene terephthalates; polypropylenes; polystyrenes; short chain fatty acids; solubilization; toxicity; wastewater; wastewater treatment
Abstract:
... Microplastics in wastewater inevitably accumulate in waste activated sludge (WAS) via wastewater biological treatment, potentially affecting the subsequent sludge treatment unit. Nevertheless, all previous research studies focused on the impacts of the direct addition of one type of model microplastics on the sludge anaerobic treatment process. This approach actually cannot reflect the real situat ...
DOI:
10.1021/acs.est.1c02300

19. Effect of sodium dodecylbenzene sulfonate on hydrogen production from dark fermentation of waste activated sludge

Author:
Min Wu; Qizi Fu; Jin Huang; Qiuxiang Xu; Dongbo Wang; Xuran Liu; Jingnan Yang; Yanxin Wu; Dandan He; Bing-Jie Ni; Qilin Wang
Source:
Science of the total environment 2021 v.799 pp. 149383
ISSN:
0048-9697
Subject:
acetogens; acidification; activated sludge; ammonia; anaerobes; biotransformation; environment; enzyme activity; fermentation; hydrogen; hydrogen production; hydrolysis; liquids; methanogens; microbial communities; sodium dodecylbenzenesulfonate; surface tension; surfactants
Abstract:
... Sodium dodecylbenzene sulfonate (SDBS), a typical surfactant being widely used in various applications, was highly accumulated in waste activated sludge. To date, however, its effect on hydrogen production from dark fermentation of sludge has not been documented. The work therefore aimed to explore whether and how SDBS affects hydrogen production. Experimental results showed that with an increase ...
DOI:
10.1016/j.scitotenv.2021.149383

20. Effects of sludge age on anaerobic acidification of waste activated sludge: Volatile fatty acids production and phosphorus release

Author:
Sisi Chen; Xiaohu Dai; Dianhai Yang; Bin Dong
Source:
Journal of environmental sciences (China) 2021 v.105 pp. 11-21
ISSN:
1001-0742
Subject:
acetates; acidification; activated sludge; butyrates; molecular weight; nitrogen content; organic nitrogen; phosphorus; propionic acid; sewage; total organic carbon; China
Abstract:
... Effects of sludge age on volatile fatty acids (VFAs) production and Phosphorus (P) release during anaerobic acidification of waste activated sludge (WAS) were investigated. Sequencing batch reactors (SBR) fed with simulating domestic sewage were applied to produce WAS of different sludge ages, and batch tests were used for anaerobic acidification. The maximum dissolved total organic carbon, releas ...
DOI:
10.1016/j.jes.2020.12.030

21. Enhanced degradation of glucocorticoids, a potential COVID-19 remedy, by co-fermentation of waste activated sludge and animal manure: The role of manure type and degradation mechanism

Author:
Ai Zhang; Jinling He; Yuye Shen; Xianbao Xu; Yanan Liu; Yongmei Li; Shimin Wu; Gang Xue; Xiang Li; Jacek Makinia
Source:
Environmental research 2021 v.201 pp. 111488
ISSN:
0013-9351
Subject:
COVID-19 infection; acidification; activated sludge; anaerobes; anaerobic digestion; betamethasone; biomass; calcium; cortisol; dissolved organic carbon; fermentation; hydrogenation; hydrolysis; hydroxylation; lipophilicity; methylation; pH; pollutants; pollution; poultry manure; propionic acid; research; toxicity; value added; volatile fatty acids; waste reduction
Abstract:
... Waste activated sludge (WAS) and animal manure are two significant reservoirs of glucocorticoids (GCs) in the environment. However, GC degradation during anaerobic digestion (AD) of WAS or animal manure has rarely been investigated. In this study, co-fermentation of WAS and animal manure was conducted to investigate the performance of AD in controlling GC dissemination. Effects of manure type on G ...
DOI:
10.1016/j.envres.2021.111488

22. Enhanced methane production from anaerobic digestion of waste activated sludge through preliminary pretreatment using calcium hypochlorite

Author:
Shu-Lin Wu; Wei Wei; Bing-Jie Ni
Source:
Journal of environmental management 2021 v.295 pp. 113346
ISSN:
0301-4797
Subject:
Methanosaeta; acidification; activated sludge; anaerobic digestion; calcium hypochlorite; chemical oxygen demand; community structure; hydrolysis; methane; methane production; methanogens; microbial communities; solubilization; viability
Abstract:
... Methane recovery from waste activated sludge (WAS) through anaerobic digestion is generally restricted by the poor degradability of WAS. Herein, a novel sludge pretreatment technology by using the calcium hypochlorite (Ca(ClO)₂) in enhancing the methane production from WAS anaerobic digestion was reported. The solubilization of WAS was significantly increased after 10–240 mg Ca(ClO)₂/g VS (VS: vol ...
DOI:
10.1016/j.jenvman.2021.113346

23. Enhancing Volatile Fatty Acid Production during Anaerobic Fermentation of Waste Activated Sludge with Persulfates: Peroxymonosulfate versus Peroxydisulfate

Author:
Wei Fang; Xuedong Zhang; Henri Spanjers; Tao Zhang
Source:
ACS sustainable chemistry & engineering 2021 v.9 no.30 pp. 10073-10082
ISSN:
2168-0485
Subject:
acidification; activated sludge; biodegradability; cost effectiveness; fermentation; fermenters; green chemistry; microbial communities; solubilization; sulfates; volatile fatty acids
Abstract:
... Persulfates ((peroxymonosulfate (PMS) and peroxydisulfate (PDS)) can disintegrate waste activated sludge (WAS), but their influence on volatile fatty acid (VFA) production during anaerobic fermentation is largely unclear. Particularly, it is unknown whether persulfates can improve fermentation without any preactivation. This study investigated how the direct addition of PMS and PDS into the fermen ...
DOI:
10.1021/acssuschemeng.1c01781

24. Enhancing methanogenic fermentation of waste activated sludge via isoelectric-point pretreatment: Insights from interfacial thermodynamics, electron transfer and microbial community

Author:
Ying Xu; Hui Geng; Renjie Chen; Rui Liu; Xiaohu Dai
Source:
Water research 2021 v.197 pp. 117072
ISSN:
0043-1354
Subject:
Gibbs free energy; acidification; activated sludge; anaerobic digestion; biogas; electron transfer; energy; fermentation; hydrolysis; hydrophobicity; isoelectric point; methane; methane production; methanogens; microbial communities; research; water
Abstract:
... The usefulness of waste activated sludge (WAS) as an energy source is limited by the poor generation efficiency of methane from WAS, which is mainly due to the complex nature of sludge and low abundance of functional microbes. In this study, the interfacial thermodynamics, electron transfer and microbial community of sludge were investigated to reveal the enhancing effects of isoelectric-point (pI ...
DOI:
10.1016/j.watres.2021.117072

25. Genome-Centric Metatranscriptomics Analysis Reveals the Role of Hydrochar in Anaerobic Digestion of Waste Activated Sludge

Author:
Zhijian Shi; Stefano Campanaro; Muhammad Usman; Laura Treu; Arianna Basile; Irini Angelidaki; Shicheng Zhang; Gang Luo
Source:
Environmental science & technology 2021 v.55 no.12 pp. 8351-8361
ISSN:
1520-5851
Subject:
Aminobacterium mobile; Methanosarcina; Syntrophomonas; acidification; activated sludge; anaerobic digestion; biomass; carbon dioxide; electron transfer; fimbriae; hydrochars; hydrothermal liquefaction; methane; methane production; transcriptomics
Abstract:
... Anaerobic digestion (AD) of waste activated sludge (WAS) has been widely used, while it poses problems including low methane yield and production rate. Hydrochar is produced by hydrothermal liquefaction of biomass; however, little is known about the role of hydrochar in promoting AD of WAS. The present study showed that hydrochar increased the methane production rate by 30.8% and yield by 31.4% of ...
DOI:
10.1021/acs.est.1c01995

26. How does choline change methanogenesis pathway in anaerobic digestion of waste activated sludge?

Author:
Lu Yu; Haiping Yuan; Nanwen Zhu; Yanwen Shen
Source:
Energy 2021 v.224 pp. 120171
ISSN:
0360-5442
Subject:
Methanobrevibacter; Methanosarcina; acidification; activated sludge; alkaloids; anaerobic digestion; choline; energy; energy recovery; hydrogen production; metabolism; methane; methane production; microbial communities
Abstract:
... Anaerobic digestion (AD) is a promising technology for stabilization of waste activated sludge (WAS) and energy recovery. Choline as a kind of alkaloid performed well in enhancing methane production from AD for WAS according to our previous research. This study furtherly investigated the influences of choline on the methanogenetic pathway and microbial community during AD process. Results showed t ...
DOI:
10.1016/j.energy.2021.120171

27. Mechanism study of improving anaerobic co-digestion performance of waste activated sludge and food waste by Fe3O4

Author:
Ruilin Zhu; Linyan He; Qianyi Li; TingXuan Huang; Meng Gao; Qin Jiang; Junyan Liu; Anrong Cai; Dezhi Shi; Li Gu; Qiang He
Source:
Journal of environmental management 2021 v.300 pp. 113745
ISSN:
0301-4797
Subject:
acidification; activated sludge; anaerobic digestion; electron transfer; environmental management; food waste; hydrolysis; methane production; methanogens; microbial activity; polysaccharides; China
Abstract:
... A large amount of waste activated sludge (WAS) and food waste (FW) are produced every year in China. Anaerobic co-digestion is considered to be an effective way to solve this problem. This study applied FW/WAS mixture as co-substrate to create different digestive environment, aiming to understand the mechanism of Fe₃O₄ particles in promoting AD performance. The results showed that the addition of ...
DOI:
10.1016/j.jenvman.2021.113745

28. Mechanistic insights into the roles of ferric chloride on methane production in anaerobic digestion of waste activated sludge

Author:
Wei Zhan; Yu Tian; Jun Zhang; Wei Zuo; Lipin Li; Yaruo Jin; Yongjia Lei; Ansen Xie; Xiyu Zhang
Source:
Journal of cleaner production 2021 v.296 pp. 126527
ISSN:
0959-6526
Subject:
acetic acid; acidification; activated sludge; anaerobic digestion; biotransformation; ferric chloride; hydrolysis; methane; methane production; methanogens; microbial communities; sewage treatment; solubilization
Abstract:
... Ferric chloride (FC) is widely used in sewage treatment in practice and would influence anaerobic digestion by remaining in waste-activated sludge (WAS). However, the effects and mechanisms of FC involved in the WAS anaerobic digestion system have yet to be thoroughly elucidated. This study revealed the different effects and underlying mechanism of FC addition on each key stage of WAS anaerobic di ...
DOI:
10.1016/j.jclepro.2021.126527

29. Medium chain fatty acids production from anaerobic fermentation of waste activated sludge

Author:
Shu-Lin Wu; Gang Luo; Jing Sun; Wei Wei; Lan Song; Bing-Jie Ni
Source:
Journal of cleaner production 2021 v.279 pp. 123482
ISSN:
0959-6526
Subject:
acidification; activated sludge; chemical oxygen demand; energy; energy density; ethanol; fermentation; hydrolysis; medium chain fatty acids; methane; microbial communities; short chain fatty acids; solubilization
Abstract:
... The utilization of waste activated sludge (WAS) to recover energy in the form of methane or short-chain fatty acids (SCFAs) is generally restricted by the low energy density of products and poor degradability of WAS. Herein, this study reported a novel alternative WAS fermentation technology to produce high-energy medium-chain fatty acids (MCFAs) from WAS in a one-stage anaerobic fermentation syst ...
DOI:
10.1016/j.jclepro.2020.123482

30. Removal of pathogen and antibiotic resistance genes from waste activated sludge by different pre-treatment approaches

Author:
Min Wang; Huiping Chen; Shulei Liu; Lin Xiao
Source:
Science of the total environment 2021 v.763 pp. 143014
ISSN:
0048-9697
Subject:
Escherichia coli; acidification; activated sludge; anodes; antibiotic resistance; environment; hydroxyl radicals; kinetics; methanol; pathogens; public health; regrowth; ultrasonic treatment; wastewater treatment
Abstract:
... In wastewater treatment plants, most of the pathogens and antibiotic resistant genes (ARGs) transferred into and concentrated in waste activated sludge (WAS), which would cause severe public health risks. In this study, the capabilities of several WAS pre-treatment approaches to inactivate coliforms/E. coli and ARGs, as well as the subsequent regrowth of coliforms/E. coli and ARGs/intI1 in treated ...
DOI:
10.1016/j.scitotenv.2020.143014

31. Removal of tetramethylammonium hydroxide (TMAH) from thin-film transistor liquid crystal display (TFT-LCD) industry wastewater by hydrolysis acidification-aerobic and anaerobic processes

Author:
Juan Lv; Yan Wang; Mengya Fu; Changyuan Ou; Fan Xiao
Source:
Journal of cleaner production 2021 v.279 pp. 123502
ISSN:
0959-6526
Subject:
Acidobacteria; Bacteroidetes; Proteobacteria; acidification; activated sludge; ammonium; anaerobic digesters; anaerobic treatment; batch systems; biodegradation; carbon dioxide; community structure; dimethylamine; films (materials); hydrolysis; industrial wastewater; industry; liquid crystal display; methane; microbial communities; mineralization; monitoring; neurons; nitrates; organic nitrogen; ribosomal RNA; sequence analysis; tetramethylammonium compounds; total organic carbon; toxic substances; transistors; trimethylamine; wastewater treatment
Abstract:
... Tetramethylammonium Hydroxide (TMAH) is widely used as a developer in the thin-film transistor liquid crystal display (TFT-LCD) industry, which is a corrosive alkaline and neuronal toxic compound. In this study, the performances of combined hydrolysis acidification-aerobic and anaerobic batch reactors for synthetic TMAH wastewater treatment were evaluated. It also investigated the real TMAH wastew ...
DOI:
10.1016/j.jclepro.2020.123502

32. Towards PHA Production from Wastes: The Bioconversion Potential of Different Activated Sludge and Food Industry Wastes into VFAs Through Acidogenic Fermentation

Author:
Gabriela Montiel-Jarillo; Teresa Gea; Adriana Artola; Javier Fuentes; Julián Carrera; María Eugenia Suárez-Ojeda
Source:
Waste and biomass valorization 2021 v.12 no.12 pp. 6861-6873
ISSN:
1877-2641
Subject:
acidification; activated sludge; anaerobic digesters; apple pomace; biomass; biotransformation; carbon; composite polymers; fermentation; food industry; glycerol; inoculum; methane production; methanogens; olive mill wastewater; pH; polyhydroxyalkanoates; propionic acid; volatile fatty acids
Abstract:
... Acidogenic fermentation of wastes produces volatile fatty acid (VFA)-rich streams that can be used as low-cost carbon sources for polyhydroxyalkanoate (PHA) production. In this study, an inoculum collected from an anaerobic reactor of a municipal WWTP was conditioned to suppress methanogenic activity. The heat-shock conditioning method of the inoculum proved to be more efficient than acid and alka ...
DOI:
10.1007/s12649-021-01480-4

33. Triclosan facilitates the recovery of volatile fatty acids from waste activated sludge

Author:
Mei Zou; Mengyu Yin; Yayi Yuan; Dongbo Wang; Weiping Xiong; Xiao Yang; Yaoyu Zhou; Hongbo Chen
Source:
Science of the total environment 2021 v.754 pp. 142336
ISSN:
0048-9697
Subject:
acetic acid; acidification; activated sludge; environment; fermentation; methane production; polymers; solubilization; triclosan
Abstract:
... The emergence of triclosan (TCS) in the environment has caused extensive concern, but its role in waste activated sludge (WAS) anaerobic fermentation (AF) is still uncertain. This work investigated the impact of TCS on volatile fatty acids (VFAs) recycling from WAS. The results showed that TCS of 200 mg/kg TSS increased the maximum VFA accumulation from 7284 to 15,083 mg COD/L. The increase in tot ...
DOI:
10.1016/j.scitotenv.2020.142336

34. Unravelling the impacts of perfluorooctanoic acid on anaerobic sludge digestion process

Author:
Chen Wang; Lan Wu; Yu-Ting Zhang; Wei Wei; Bing-Jie Ni
Source:
Science of the total environment 2021 v.796 pp. 149057
ISSN:
0048-9697
Subject:
Methanosaeta; acidification; activated sludge; anaerobic digestion; environment; metabolites; methane production; microbial communities; perfluorooctanoic acid; persistent organic pollutants; wastewater treatment
Abstract:
... Perfluorooctanoic acid (PFOA) is a type of persistent organic pollutant that has been detected in wastewater treatment systems, subsequently entering the waste activated sludge (WAS) anaerobic digesters. Nevertheless, how PFOA affects the anaerobic digestion of WAS has never been reported till now. In this study, a series of batch digesters were set up to assess the performance of the anaerobic sl ...
DOI:
10.1016/j.scitotenv.2021.149057

35. Unveiling the different faces of chlortetracycline in fermentative volatile fatty acid production from waste activated sludge

Author:
Mengge Tang; Yanxin Wu; Xingning Zeng; Xiao Yang; Dongbo Wang; Hongbo Chen
Source:
Bioresource technology 2021 v.329 pp. 124875
ISSN:
0960-8524
Subject:
acetate kinase; acidification; activated sludge; antibiotic residues; chlortetracycline; fermentation; methane production; polymers; secretion; volatile fatty acids; wastewater treatment
Abstract:
... One of the key challenges of wastewater treatment today is to understand the potential effect of residual pollutants on the management of waste activated sludge (WAS). This study aims to clarify the effect of chlortetracycline (CTC) as a residual antibiotic on the anaerobic fermentation of WAS to produce volatile fatty acids (VFAs). The results show that CTC with a concentration of 10 mg/kg total ...
DOI:
10.1016/j.biortech.2021.124875

36. Unveiling the mechanisms of a novel polyoxometalates (POMs)-based pretreatment technology for enhancing methane production from waste activated sludge

Author:
Haixiao Guo; Yufen Wang; Lixin Tian; Wei Wei; Tingting Zhu; Yiwen Liu
Source:
Bioresource technology 2021 v.342 pp. 125934
ISSN:
0960-8524
Subject:
Methanosaeta; acidification; activated sludge; anaerobes; biodegradability; digestion; energy; hydrolysis; methane; methane production; microbial communities; redox potential; wastewater treatment
Abstract:
... This study proposed a novel polyoxometalates (POMs)-based pretreatment technology to improve methane production from waste activated sludge (WAS) for the first time. Experimental results indicated methane production from WAS pretreated with 0.25 g POMs/g TSS increased by 43.7%. Mechanism analysis revealed POMs pretreatment promoted WAS disintegration and improved the biodegradability of the releas ...
DOI:
10.1016/j.biortech.2021.125934

37. Volatile fatty acids production from waste activated sludge during anaerobic fermentation: The effect of superfine sand

Author:
Xiupeng Jiang; Zhiyi Qin; Leiyu Feng; Yinguang Chen; Jianguang Chen; Xianzhong Zhang; Zhenguang Zhang; Yingqing Guo; Jing Sun
Source:
Bioresource technology 2021 v.319 pp. 124249
ISSN:
0960-8524
Subject:
acetate kinase; acetic acid; acidification; activated sludge; fermentation; genes; heat; sand; solubilization; uncertainty
Abstract:
... Superfine sand in waste activated sludge (WAS) increased the uncertainty of anaerobic fermentation. Experiments showed that VFAs production from WAS was positively affected by superfine sand, with an increase from 2513 mg COD/L in the control (without superfine sand) to 3002 mg COD/L with superfine sand. A mechanism study demonstrated that the main factor responsible for the improved VFAs accumula ...
DOI:
10.1016/j.biortech.2020.124249

38. A novel acetogenic bacteria isolated from waste activated sludge and its potential application for enhancing anaerobic digestion performance

Author:
Cheng Huang; Wei Wang; Xiuyun Sun; Jinyou Shen; Lianjun Wang
Source:
Journal of environmental management 2020 v.255 pp. 109842
ISSN:
0301-4797
Subject:
Clostridium; acetates; acetogens; acidification; activated sludge; anaerobic digestion; bioaugmentation; gelatin; hydrolysis; nitrates; pH; phylogeny; starch; temperature; total suspended solids; volatile fatty acids
Abstract:
... The development of anaerobic digestion (AD) for volatile fatty acids (VFAs) production from waste activated sludge (WAS) is arrested due to low hydrolysis and acidification efficiency. This study proposed to enhance WAS reduction and VFAs accumulation during AD process via bioaugmentation of acetate-producing bacteria. Four acetogens were firstly isolated from a temperature-phased anaerobic digest ...
DOI:
10.1016/j.jenvman.2019.109842

39. A novel and effective pretreatment to stimulate short‐chain fatty acid production from waste activated sludge anaerobic fermentation by ferrous iron catalyzed peracetic acid

Author:
Jie Wang; Kankan Shang; Xueyan Guo; Xingyan Xia; Liangjun Da
Source:
Journal of chemical technology and biotechnology 2020 v.95 no.3 pp. 567-576
ISSN:
0268-2575
Subject:
Archaea; Firmicutes; acetic acid; acidification; activated sludge; biodegradability; catalytic activity; chemical oxygen demand; community structure; enzymes; fermentation; hydrolysis; hydroxyl radicals; iron; methane production; methanogens; microbial communities; oxidation; oxygen; peracetic acid; polymers; short chain fatty acids; solubilization; synergism
Abstract:
... BACKGROUND: This study investigates a novel, efficient and green pretreatment approach using ferrous iron catalyzed peracetic acid oxidation (Fe²⁺/PAA) on anaerobic fermentation of waste activated sludge. The underlying mechanisms are also studied for both the chemical and microbial effects. RESULTS: The results indicate that Fe²⁺/PAA exhibit significant positive synergistic effect on short‐chain ...
DOI:
10.1002/jctb.6232

40. Alkaline aided thermophiles pretreatment of waste activated sludge to increase short chain fatty acids production: Microbial community evolution by alkaline on hydrolysis and fermentation

Author:
Chun-Xue Yang; Shuai Zhao; Ze-Chong Guo; Wen-Zong Liu; Ling Wang; Shao-Peng Yu; Bao-Ling Liu; Xue Cong
Source:
Environmental research 2020 v.186 pp. 109503
ISSN:
0013-9351
Subject:
Acidobacteria; Caloramator; acidification; activated sludge; chemical oxygen demand; fermentation; heat tolerance; hydrolysis; microbial communities; proteins; proteolysis; short chain fatty acids; thermophilic bacteria
Abstract:
... Adding alkaline into an anaerobic waste activated sludge (WAS) fermentation with thermophilic bacteria pretreatment could efficiently improve short-chain fatty acids (SCFAs) accumulation to 3550 ± 120 mg COD/L. The acidification rate in combined test was 21.2%, while that was 15.6% and 10.7% in sole thermophilic bacteria pretreatment and control tests respectively. Four distinct groups of microbes ...
DOI:
10.1016/j.envres.2020.109503

41. Characteristics of bacterial populations in an industrial scale petrochemical wastewater treatment plant: Composition, function and their association with environmental factors

Author:
Qinghong Wang; Jiahao Liang; Simin Zhang; Brandon A. Yoza; Qing X. Li; Yali Zhan; Huangfan Ye; Peng Zhao; Chunmao Chen
Source:
Environmental research 2020 v.189 pp. 109939
ISSN:
0013-9351
Subject:
Acidobacteria; Bacteroidetes; Chloroflexi; Planctomycetes; Proteobacteria; acidification; activated sludge; bacterial communities; biochemical oxygen demand; biochemical pathways; biofilters; biological treatment; caprolactam; community structure; hydrolysis; naphthalene; petroleum; phylogeny; research; toluene; total nitrogen; variance; wastewater; wastewater treatment
Abstract:
... The efficiency of petrochemical wastewater biological treatment is dependent upon complex bacterial communities. A well understanding of the structure and function of bacterial community and their association with environmental variables is essential for the elucidation of contaminant removal mechanisms and optimization of wastewater treatment processes. In this study, the bacterial communities an ...
DOI:
10.1016/j.envres.2020.109939
CHORUS:
10.1016/j.envres.2020.109939

42. Effect of Hydrothermal Pretreatment on Volatile Fatty Acids Production from Thickened Waste Activated Sludge

Author:
Farokh laqa Kakar; Ehssan Hosseini Koupaie; Ahmed Shabir Razavi; Hisham Hafez; Elsayed Elbeshbishy
Source:
BioEnergy research 2020 v.13 no.2 pp. 591-604
ISSN:
1939-1234
Subject:
acetic acid; acidification; activated sludge; hydrogen; solubilization; temperature; volatile fatty acids
Abstract:
... Investigating the impact of hydrothermal pretreatment (HTP) on organic solubilization and anaerobic acidification of thickened waste activated sludge (TWAS) was the objective of this study. For this purpose, 15 different hydrothermal pretreatment scenarios were investigated. The HTP temperature, retention time, and pressure for this study extended from 150 to 240 °C, 5 to 30 min, and 69 to 488 psi ...
DOI:
10.1007/s12155-019-10056-z

43. Effect of initial pH on the sludge fermentation performance enhanced by aged refuse at low temperature of 10 °C

Author:
Yan Kuang; Ying Gao; Jing Zhang; Jianwei Zhao; Siyi Luo; Dalei Zhang; Chenggang Lu; Yingjie Sun
Source:
Environmental science and pollution research international 2020 v.27 no.25 pp. 31468-31476
ISSN:
0944-1344
Subject:
acidification; activated sludge; fermentation; hydrolysis; methane; methane production; pH; phosphates; pollution; research; short chain fatty acids; solid wastes; temperature
Abstract:
... The efficiency of anaerobic fermentation of waste activated sludge (WAS) under low-temperature condition is usually low. This work reported a new strategy to enhance the low-temperature fermentation of WAS by using aged refuse (AR), and explored the effect of initial pH 4 till pH 12 on the production of short-chain fatty acid (SCFA) from AR-enhanced sludge fermentation. The results showed that AR ...
DOI:
10.1007/s11356-020-09306-x

44. Effect of nitrite addition on the two-phase anaerobic digestion of waste activated sludge: Optimization of the acidogenic phase and influence mechanisms

Author:
Yiqing Lu; Ying Xu; Sisi Chen; Bin Dong; Xiaohu Dai
Source:
Environmental pollution 2020 v.261 pp. 114085
ISSN:
0269-7491
Subject:
acidification; activated sludge; anaerobic digestion; bioenergy; denitrification; fermentation; hydrolysis; methane production; methanogens; nitrates; nitrite nitrogen; nitrites; pH; solubilization; waste treatment; wastewater
Abstract:
... To simultaneously achieve biological denitrification and bio-energy recovery from sludge, the effects of nitrite on the two-phase anaerobic digestion (AD) of waste activated sludge were explored. Herein, effects of nitrite on the acidogenic phase are optimized, and the corresponding influence mechanisms are investigated. The experimental results show that the optimal nitrite treatment conditions f ...
DOI:
10.1016/j.envpol.2020.114085

45. Effects of different hypochlorite types on the waste activated sludge fermentation from the perspectives of volatile fatty acids production, microbial community and activity, and characteristics of fermented sludge

Author:
Jingyang Luo; Wenxuan Huang; Qin Zhang; Wen Guo; Yang Wu; Qian Feng; Fang Fang; Jiashun Cao; Yinglong Su
Source:
Bioresource technology 2020 v.307 pp. 123227
ISSN:
0960-8524
Subject:
acidification; activated sludge; additives; calcium hypochlorite; chemical oxygen demand; dewatering; fermentation; hydrolysis; microbial communities; sodium hypochlorite; solubilization; volatile fatty acids
Abstract:
... The effects of different hypochlorite types (namely Ca(OCl)₂ and NaOCl) on the waste activated sludge (WAS) anaerobic fermentation, and microbial community and activity were investigated. The results indicated that both Ca(OCl)₂ and NaOCl contributed to volatile fatty acids (VFAs) production by simultaneously enhancing the solubilization, hydrolysis and acidification processes. The maximal VFAs wa ...
DOI:
10.1016/j.biortech.2020.123227

46. Effects of dissimilatory iron reduction on acetate production from the anaerobic fermentation of waste activated sludge under alkaline conditions

Author:
Zisheng Zhao; Yang Li; Zhiqiang Zhao; Qilin Yu; Yaobin Zhang
Source:
Environmental research 2020 v.182 pp. 109045
ISSN:
0013-9351
Subject:
acetates; acidification; activated sludge; anaerobic digesters; anaerobic digestion; butyrates; fermentation; hydrolysis; iron; iron oxides; methanogens; pH; short chain fatty acids
Abstract:
... Anaerobic digestion of waste activated sludge (WAS) to produce acetate has recently attracted growing interest, while the slow hydrolytic acidification of sludge and the consumption of acetate by methanogens both decrease the yield of acetate. In this study, Fe₃O₄ was added to a WAS anaerobic digester under alkaline conditions (pH = 10). The concentration of short-chain fatty acids (SCFA) during W ...
DOI:
10.1016/j.envres.2019.109045

47. Effects of zinc oxide nanoparticles on sludge anaerobic fermentation: phenomenon and mechanism

Author:
Baodan Jin; Yue Yuan; Ping Zhou; Jiahui Niu; Jintao Niu; Jingwen Dai; Nuonan Li; Hongfan Tao; Zhigang Ma; Ju Zhang; Zhongfang Zhang; Yu Li
Source:
Journal of environmental science and health 2020 v.55 no.9 pp. 1094-1103
ISSN:
1532-4117
Subject:
Azospira; Hyphomicrobium; Ottowia; acidification; activated sludge; biodegradability; fermentation; oxidoreductases; pollution; polysaccharides; proteinases; zinc oxide
Abstract:
... Zinc oxide nanoparticles (ZnO NPs) production and usage might lead to a large discharge of ZnO NPs into the natural environment, raising concerns of pollution and ecological security. The effects of ZnO NPs on waste activated sludge hydrolytic acidification and microbial communities were studied in semi-continuous fermentation systems. The fermentation performance of eight ZnO NPs concentrations i ...
DOI:
10.1080/10934529.2020.1771120

48. Enhancing acidogenic fermentation of waste activated sludge via isoelectric-point pretreatment: Insights from physical structure and interfacial thermodynamics

Author:
Ying Xu; Linke Zheng; Hui Geng; Rui Liu; Xiaohu Dai
Source:
Water research 2020 v.185 pp. 116237
ISSN:
0043-1354
Subject:
Gibbs free energy; acidification; activated sludge; biodegradability; biopolymers; energy; fermentation; fractal dimensions; hydrolysis; isoelectric point; molecular weight; polysaccharides; research; solubilization; total organic carbon; water
Abstract:
... The poor biodegradability of waste activated sludge (WAS) is widely regarded as one of the main bottlenecks in the fermentation of sludge and is attributed mainly to the complex nature of sludge. In this study, the physical structure and interfacial thermodynamics of sludge, which reflect its complex nature, were explored to reveal the effects of isoelectric-point (pI) pretreatment on enhancing th ...
DOI:
10.1016/j.watres.2020.116237

49. Insights into the toxicity of troclocarban to anaerobic digestion: Sludge characteristics and methane production

Author:
Yali Wang; Dongbo Wang; Neng Yi; Yifu Li; Bing-Jie Ni; Qilin Wang; Hongjie Wang; Xiaoming Li
Source:
Journal of hazardous materials 2020 v.385 pp. 121615
ISSN:
0304-3894
Subject:
acidification; activated sludge; anaerobic digestion; antibiotics; dissolved organic matter; hydrolysis; methane production; methanogens; microbial communities; moieties; pH; polysaccharides; toxicity
Abstract:
... Triclocarban (TCC), as the most typical antibacterial agent, is widely discovered in many ecological environment, especially in sludge. However, so far, no studies have reported the effect of TCC exposure on the properties of excess sludge. Therefore, in this study, TCC’s toxicities to waste activated sludge (WAS) were analyzed by investigating the variation of physicochemical properties of sludge ...
DOI:
10.1016/j.jhazmat.2019.121615

50. Life Cycle Assessment of the Mesophilic, Thermophilic, and Temperature-Phased Anaerobic Digestion of Sewage Sludge

Author:
Iryna Lanko; Laura Flores; Marianna Garfí; Vladimir Todt; John A. Posada; Pavel Jenicek; Ivet Ferrer
Source:
Water 2020 v.12 no.11 pp. -
ISSN:
2073-4441
Subject:
acidification; activated sludge; agricultural land; anaerobic digestion; climate change; electricity; environmental impact; environmental performance; eutrophication; fossils; freshwater; heat; humans; life cycle assessment; methane; ozone depletion; sewage sludge; toxicity; wastewater; wastewater treatment
Abstract:
... In this study the environmental impact of the anaerobic digestion (AD) of sewage sludge within an activated sludge wastewater treatment plant (WWTP) was investigated. Three alternative AD systems (mesophilic, thermophilic, and temperature-phased anaerobic digestion (TPAD)) were compared to determine which system may have the best environmental performance. Two life cycle assessments (LCA) were per ...
DOI:
10.3390/w12113140