期刊
JOURNAL OF CLEANER PRODUCTION
卷 275, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.122921
关键词
Endogenous free ammonia; Low-alkaline fermentation; Waste activated sludge; Short-chain fatty acids; Carbon source
资金
- National Natural Science Foundation of China [51778352]
- Science and Technology Commission of Shanghai Municipality [18230710900]
Alkaline fermentation at pH 10 is an effective method of producing short-chain fatty acids from waste activated sludge, but requires high cost of alkali. In this study, low-alkaline fermentation at pH 9 with enhanced endogenous free ammonia was proposed to improve sludge hydrolysis and short-chain fatty acids production for the first time. The results showed that the release of 210.6 +/- 5.9 mg/L of endogenous free ammonia was sufficient for sludge hydrolysis, with a soluble chemical oxygen demand production of 6303.8 +/- 45.9 mg/L within 24 h. Following the increase in sludge hydrolysis, ammonia stripping was employed to further improve acidogenesis by eliminating free ammonia inhibition. The final short-chain fatty acids production was 431.4 +/- 1.7 mg chemical oxygen demand/g volatile suspended solid, which was even higher than that of regular alkaline fermentation. Furthermore, the theoretical availability of the produced short-chain fatty acids as a carbon source for denitrification was improved by 56.7%. A schematic of a wastewater treatment process employing low-alkaline fermentation of sludge considering carbon neutrality and nutrients recovery was proposed. (C) 2020 Elsevier Ltd. All rights reserved.
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