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Co-pretreatment (calcium peroxide + freeze) to improve anaerobic fermentation of waste activated sludge: Method optimization and mechanism insights

Yuying Gao,Xiang Tang,Linrui Zhong,Baowei Zhang, Shuang Li,Mier Wang, Huannian Xiao,Changzheng Fan,Jiangfu Zheng

Chemical Engineering Journal（2024）

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Abstract
•CaO2-freezing co-pretreatment promoted SCFAs yields from WAS.•RSM analysis recommended the best co-pretreatment conditions.•The maximum cumulative yield of SCFAs was 162.34 mg COD/g VSS.•Longer sludge retention time promotes methane production.•SCFAs accumulation, Ca2+, and freezing were positively correlated.
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Key words
Waste-activated sludge,Short-chain fatty acids,Response surface methodology,CaO2-freezing co-pretreatment,Anaerobic fermentation
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