An efficient and green pretreatment to stimulate short-chain fatty acids production from waste activated sludge anaerobic fermentation using free nitrous acid

Li, Xiaoming, Zhao, Jianwei, Wang, Dongbo, Yang, Qi, Xu, Qiuxiang, Deng, Yongchao, Yang, Weiqiang and Zeng, Guangming (2016) An efficient and green pretreatment to stimulate short-chain fatty acids production from waste activated sludge anaerobic fermentation using free nitrous acid. Chemosphere, 144 160-167. doi:10.1016/j.chemosphere.2015.08.076


Author Li, Xiaoming
Zhao, Jianwei
Wang, Dongbo
Yang, Qi
Xu, Qiuxiang
Deng, Yongchao
Yang, Weiqiang
Zeng, Guangming
Title An efficient and green pretreatment to stimulate short-chain fatty acids production from waste activated sludge anaerobic fermentation using free nitrous acid
Journal name Chemosphere   Check publisher's open access policy
ISSN 1879-1298
0045-6535
Publication date 2016-02-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.chemosphere.2015.08.076
Open Access Status Not Open Access
Volume 144
Start page 160
End page 167
Total pages 8
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Abstract Short-chain fatty acid (SCFA) production from waste activated sludge (WAS) anaerobic fermentation is often limited by the slow hydrolysis rate and poor substrate availability, thus a long fermentation time is required. This paper reports a new pretreatment approach, i.e., using free nitrous acid (FNA) to pretreat sludge, for significantly enhanced SCFA production. Experimental results showed the highest SCFA production occurred at 1.8 mg FNA/L with time of day 6, which was 3.7-fold of the blank at fermentation time of day 12. Mechanism studies revealed that FNA pretreatment accelerated disruption of both extracellular polymeric substances and cell envelope. It was also found that FNA pretreatment benefited hydrolysis and acidification processes but inhibited the activities of methanogens, thereby promoting the yield of SCFA. In addition, the FNA pretreatment substantially stimulated the activities of key enzymes responsible for hydrolysis and acidification, which were consistent with the improvement of solubilization, hydrolysis and acidification of WAS anaerobic fermentation.
Keyword Short-chain fatty acid
Free nitrous acid pretreatment
Waste activated sludge
Anaerobic fermentation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
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