| Stepwise freezing-thawing treatment promotes short-chain fatty acids production from waste activated sludge | |
Tang, Cong-Cong; Yao, Xing-Ye; Jin, Hong-Yu; Sun, Qian; Zou, Zheng-Shuo; Yang, Wen-Jing; He, Zhang-Wei; Zhou, Ai-Juan; Chen, Fan; Ren, Yong-Xiang; Liu, Wen-Zong ; Wang, Aijie
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| 2022-04-20 | |
| Source Publication | SCIENCE OF THE TOTAL ENVIRONMENT
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| ISSN | 0048-9697 |
| Volume | 818Issue:0Pages:151694 |
| Abstract | ABSTR A C T Waste activated sludge (WAS), as the byproducts of wastewater treatment plants, has been greatly produced. With high cost and environmental risk of WAS disposal, to explore a low-cost and environment-friendly technol-ogy has been a great challenge. Considering that WAS is a collection of organic matters, anaerobic fermentation has been selected as a sustainable way to simultaneously recover resources and reduce environmental pollution. To recover short-chain fatty acids (SCFAs) has gained great concern because of the high value-added application and high-efficiency production process. Considering the temperature in some areas of the world can reach to below 0 degrees C, this study proposed an efficient strategy, i.e., stepwise freezing and thawing treatment, to promote SCFAs production. The maximal production of SCFAs, i.e., 246 mg COD/g volatile suspended solid, was obtained with the shortened retention time of five days. Mechanistic studies showed that the solubilization of both extra-cellular polymeric substances (EPSs) and microbial cells could be accelerated, with the EPSs removal of 58.3% for proteins and 59.0% for polysaccharides. Also, the hydrolysis process was promoted to provide more substrates for subsequent acidogenisis, and the functional microorganisms, such as Romboutsia, Paraclostridium, Macellibacteroides and Conexibacter, were greatly enriched, with a total abundance of 26.2%. Moreover, compared to control, methanogenesis was inhibited at a shortened sludge retention time (e.g., five days), which benefited to the accumulation of SCFAs, but the methane production was increased by 25.2% at a longer sludge retention time (e.g., ten days). Thus, these findings of this work may provide some new solutions for the enhanced resource recovery from WAS, and further for carbon-neutral operation of wastewater treatment plants.(c) 2021 Elsevier B.V. All rights reserved. |
| Department | 中国科学院环境生物技术重点实验室 ; 中国科学院环境生物技术重点实验室 |
| Keyword | ANAEROBIC-DIGESTION THERMAL HYDROLYSIS PRETREATMENT |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47819 |
| Collection | 中国科学院环境生物技术重点实验室 |
| Affiliation | 1.Xian Univ Architecture & Technol, Shaanxi Key Lab Environm Engn, Sch Environm & Municipal Engn, Xian 710055, Peoples R China 2.Xian Univ Architecture & Technol, Key Lab Northwest Water Resource Environm & Ecol, Minist Educ, Xian 710055, Peoples R China 3.Environm Sci Acad Shaanxi Prov, Xian 710061, Peoples R China 4.Taiyuan Univ Technol, Coll Environm Sci & Engn, Taiyuan 030024, Peoples R China 5.Northwestern Polytech Univ, Sch Ecol & Environm, Xian 710129, Peoples R China |
| Recommended Citation GB/T 7714 | Tang, Cong-Cong,Yao, Xing-Ye,Jin, Hong-Yu,et al. Stepwise freezing-thawing treatment promotes short-chain fatty acids production from waste activated sludge[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,818(0):151694. |
| APA | Tang, Cong-Cong.,Yao, Xing-Ye.,Jin, Hong-Yu.,Sun, Qian.,Zou, Zheng-Shuo.,...&Wang, Aijie.(2022).Stepwise freezing-thawing treatment promotes short-chain fatty acids production from waste activated sludge.SCIENCE OF THE TOTAL ENVIRONMENT,818(0),151694. |
| MLA | Tang, Cong-Cong,et al."Stepwise freezing-thawing treatment promotes short-chain fatty acids production from waste activated sludge".SCIENCE OF THE TOTAL ENVIRONMENT 818.0(2022):151694. |
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| Stepwise freezing-th（1549KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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