| Title: | Insight into the enhancing short-chain fatty acids (SCFAs) production from waste activated sludge via polyoxometalates pretreatment: Mechanisms and implications |
| Author(s): | Guo H; Wang Y; Tian L; Wei W; Zhu T; Liu Y; |
| Address: | "School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China. School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China. Electronic address: yiwen.liu@tju.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2021.149392 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Polyoxometalates (POMs), a versatile and environmentally-friendly inorganic material, have been extensively studied and applied in chemical catalytic oxidation and biological nutrients removal processes. However, little is known about effects of POMs pretreatment on anaerobic sludge fermentation. This study thereby filled such knowledge gap and provided insights into the underlying mechanisms. Results demonstrated the maximal short-chain fatty acids (SCFAs) production increased by 6.18 times with POMs rising from 0 to 0.05 g/g TSS. Mechanistic investigations revealed that the oxidation stress of POMs as well as reactive oxygen species (ROS) activated by POMs were responsible for the disintegration of waste activated sludge (WAS). More importantly, POMs pretreatment improved the biodegradability of organics released, providing more biodegradable substrates for SCFAs generation. Furthermore, the inhibition of POMs to SCFAs producers was less severe than that to SCFAs consumers, leading to SCFAs accumulation. Microbial community analysis exhibited that increased the population of hydrolysis (i.e., Longilinea) and SCFAs generation microbes (i.e., Acinetobacter and Fusibacter). Further evaluation showed that the POMs-based technology is economically and environmentally attractive for the pretreatment of WAS. Finally, a 'closed-loop' concept of the reutilization of renewable POMs may provide an important implication of WAS management in the future" |
| Keywords: | "Fatty Acids, Volatile Fermentation Hydrogen-Ion Concentration Hydrolysis *Sewage *Tungsten Compounds Anaerobic sludge fermentation Polyoxometalates (POMs) Short-chain fatty acids (SCFAs) Sludge pretreatment Waste activated sludge (WAS);" |
| Notes: | "MedlineGuo, Haixiao Wang, Yufen Tian, Lixin Wei, Wei Zhu, Tingting Liu, Yiwen eng Netherlands 2021/08/14 Sci Total Environ. 2021 Dec 15; 800:149392. doi: 10.1016/j.scitotenv.2021.149392. Epub 2021 Jul 31" |
