期刊
BIORESOURCE TECHNOLOGY
卷 347, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126337
关键词
Waste activated sludge; Anaerobic digestion; Short-chain fatty acids; Freezing-low temperature treatment; Acid-producing microorganisms
资金
- National Natural Science Foundation of China [52000147, 51908448, 52070139]
- Young Talent Promotion Program of Xi'an [095920211328]
- Natural Science Foundation of Shaanxi Province [2020JQ-658]
- Open Project of Key Laboratory of Environmental Biotechnology, CAS [kf2020011]
- Natural Science Foundation project of Education Department of Shaanxi Province [20JK0715]
- Key Industrial Innovation Chain Project of Shaanxi Key RD Plan [2020ZDLNY06-08]
- Key Scientific Research Project of Education Department of Shaanxi Province [20JS081]
This study proposed a novel and high-efficiency strategy, freezing followed by low-temperature thermal treatment, to significantly promote short-chain fatty acids (SCFAs) production from waste activated sludge. The maximal production of SCFAs was achieved with a shortened retention time, and the potential carbon source recovery was increased compared to traditional freezing/thawing treatment. Additionally, the strategy accelerated the solubilization and hydrolysis steps of the sludge and enriched acid-producing microorganisms.
This study proposed a novel and high-efficiency strategy, i.e., freezing followed by low-temperature thermal treatment, to significantly promote short-chain fatty acids (SCFAs) production from waste activated sludge compared to traditional freezing/thawing treatment. The maximal production of SCFAs was 212 mg COD/g VSS with a shortened retention time of five days, and the potentially recovered carbon source, including SCFAs, soluble polysaccharides and proteins, reached 321 mg COD/g VSS, increased by 92.1 and 28.3% compared to sole freezing and thermal treatment. Both the solubilization and hydrolysis steps of WAS were accelerated, and the acid-producing microorganisms, such as Macellibacteroides, Romboutsia and Paraclostridium, were greatly enriched, with a total abundance of 13.9%, which was only 0.54% in control. Interestingly, the methane production was inhibited at a shortened retention time, resulting in SCFAs accumulation, whereas it was increased by 32.0% at a longer sludge retention time, providing a potential solution for energy recovery from WAS.
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