期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 27, 期 25, 页码 31468-31476出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-09306-x
关键词
Anaerobic fermentation; Waste activated sludge; Methane; Short-chain fatty acid; Hydrolysis; Acidification; Phosphate
资金
- National Natural Science Foundation of China (NSFC) [51908305]
- China Postdoctoral Science Foundation [2019M660162]
- Qingdao University of Technology [QUTSEME201906]
- Shandong Province Key Research and Development Program, China [2019GSF110005]
The efficiency of anaerobic fermentation of waste activated sludge (WAS) under low-temperature condition is usually low. This work reported a new strategy to enhance the low-temperature fermentation of WAS by using aged refuse (AR), and explored the effect of initial pH 4 till pH 12 on the production of short-chain fatty acid (SCFA) from AR-enhanced sludge fermentation. The results showed that AR improved WAS fermentation under low-temperature condition (10 degrees C), and the maximum accumulation of SCFA was 75.6 +/- 3.5 mg/g, which was significantly higher than that of the blank (without AR). In addition, when the initial pH was 7, the maximum yield of methane was 102.2 +/- 4.8 mL/g, whereas when the initial pH was 11, the maximum yield of SCFA was 85.6 +/- 2.8 mg/g. Weak acid or alkali pH benefited hydrolysis and acidification of WAS, but inhibited methanogenesis. The release of NH4+-N and phosphate in a strong alkaline environment (pH 11 and 12) was lower than that in other alkaline environments (pH 10).
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