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Environmental Technology Volume 37, 2016 - Issue 12
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Articles

Enhancing anaerobic digestion of waste activated sludge by pretreatment: effect of volatile to total solids

Xiao WangState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Xu DuanState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Jianguang ChenState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Kuo FangState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Leiyu FengState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China;Research and Service Center for Environmental Protection Industry, Yancheng, Jiangsu Province, People's Republic of ChinaCorrespondence[email protected]
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Yuanyuan YanState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China;Research and Service Center for Environmental Protection Industry, Yancheng, Jiangsu Province, People's Republic of ChinaCorrespondence[email protected]
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Qi ZhouState Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Pages 1520-1529 | Received 15 Mar 2015, Accepted 12 Nov 2015, Published online: 08 Jan 2016
 
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ABSTRACT

In this study the effect of volatile to total solids (VS/TS) on anaerobic digestion of waste activated sludge (WAS) pretreated by alkaline, thermal and thermal–alkaline strategies was studied. Experimental results showed that the production of methane from sludge was increased with VS/TS. When anaerobic digesters were fed with sludge pretreated by the thermal–alkaline method, the average methane yield was improved from 2.8 L/d at VS/TS 0.35 to 4.7 L/d at VS/TS 0.56. Also, the efficiency of VS reduction during sludge anaerobic digestion varied between 18.9% and 45.6%, and increased gradually with VS/TS. Mechanism investigation of VS/TS on WAS anaerobic digestion suggested that the general activities of anaerobic microorganisms, activities of key enzymes related to sludge hydrolysis, acidification and methanogenesis, and the ratio of Archaea to Bacteria were all increased with VS/TS, showing good agreement with methane production.

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