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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Microbial Community Profiles Related to Volatile Fatty Acids Production in Mesophilic and Thermophilic Fermentation of Waste Activated Sludge Pretreated by Enzymolysis
Author NameAffiliationPostcode
Xiaodong Xin* Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China 361021
Bingxin Wang Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China 
Junming Hong Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China
 
Junguo He State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China 
Wei Qiu State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China 
Bor-Yann Chen Department of Chemical and Materials Engineering, I-Lan University, I-Lan 26047, Taiwan, China 
Abstract:
Mesophilic and thermophilic anaerobic fermentation performance of waste activated sludge (WAS) pretreated by enzymes catalysis associated with microbial community shifts were investigated. WAS disintegration was boosted considerably by enzymolysis with 8750 mg/L of soluble COD release within 180 min. Mesophilic anaerobic fermentation (MAF) produced nearly equal VFA accumulation with over 3200 mg COD/L compared with that of thermophilic fermentation (TAF). Bacterial community consortia showed great shifting differences in dynamics of main T-RFs between MAF and TAF. Moreover, MAF was conducive to form intermediate bacterial community evenness compared to TAF, which preserved a robust function of VFA production. The enzymes catalysis prompted bio-energy (electricity) recovery potential of WAS organics via anaerobic fermentation (MAF/TAF) with evaluated electricity conversion efficiency of 0.75-0.82 kW h/kg VSS (3.9 times higher than control test). Finally, this study proposed some novel thinking on future WAS treatment/management towards energy recovery coupled with energy-sufficient wastewater treatment by co-locating WAS anaerobic fermentation, MFC plant with wastewater treatment plant(s).
Key words:  waste activated sludge (WAS)  enzymes catalysis  volatile fatty acid (VFA)  bacterial community  electric energy conversion
DOI:10.11916/j.issn.1005-9113.18132
Clc Number:X703
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