globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.02.032
Scopus记录号: 2-s2.0-85062413919
论文题名:
Stepwise pH control to promote synergy of chemical and biological processes for augmenting short-chain fatty acid production from anaerobic sludge fermentation
作者: Wang X.; Li Y.; Zhang Y.; Pan Y.-R.; Li L.; Liu J.; Butler D.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155
起始页码: 193
结束页码: 203
语种: 英语
英文关键词: Conceptual model ; Fermentation ; Microbial community structure ; Short-chain fatty acids ; Stepwise pH control ; Waste activated sludge
英文摘要: Although sludge-converted short-chain fatty acids (SCFAs) are promising feedstocks for biorefineries, it remains challenging to maximise SCFA production by enhancing synergies between chemical/biological hydrolysis and acidogenesis processes while employing a balanced composition of microbial communities to counteract methanogenesis. Herein, stepwise control of fermentation pH and chemical/microbiological composition analysis of fermented sludge were used to probe the underlying mechanisms of SCFA production. Fermentation at pH 11 during the first three days promoted both chemical and microbial hydrolysis of sludge proteins and provided a niche for Anaerobrancaceae sp. to transform soluble protein into SCFAs. When pH was decreased from 11 to 9, Acinetobacter, Proteiniborus, Proteiniclasticum, and other acetogens became predominant and stayed significantly more active than during first-stage fermentation at pH 11, which benefited the acidification of hydrolysed substrates. Further assays indicated that early-stage sludge fermentation at pH 11 decreased the total amount of methanogenic archaea and hence reduced the amount of SCFAs consumed for methane production. Thus, the use of stepwise pH control for sludge fermentation allowed one to establish process synergies, facilitate chemical and biological hydrolysis, inhibit methanogens, and promote the growth of acidifying bacterial communities, which resulted in efficient SCFA production from sludge. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121903
Appears in Collections:气候变化事实与影响

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作者单位: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Centre for Water Systems, Department of Engineering, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, United Kingdom; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute for Environmental Genomics, Department of Microbiology and Plant Biology, School of Civil Engineering and Environmental Sciences, University of Oklahoma, Norman, OK 73019, United States

Recommended Citation:
Wang X.,Li Y.,Zhang Y.,et al. Stepwise pH control to promote synergy of chemical and biological processes for augmenting short-chain fatty acid production from anaerobic sludge fermentation[J]. Water Research,2019-01-01,155
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