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Environ Technol

Title:		Enhancing anaerobic digestion of waste activated sludge by pretreatment: effect of volatile to total solids
Author(s):		Wang X; Duan X; Chen J; Fang K; Feng L; Yan Y; Zhou Q;
Address:		"a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China. b Research and Service Center for Environmental Protection Industry , Yancheng , Jiangsu Province , People's Republic of China"
Journal Title:		Environ Technol
Year:		2016
Volume:		20160108
Issue:		12
Page Number:		1520 - 1529
DOI:		10.1080/09593330.2015.1120783
ISSN/ISBN:		1479-487X (Electronic) 0959-3330 (Linking)
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"
Keywords:		"*Anaerobiosis Archaea Hydrogen-Ion Concentration Methane Sewage/*chemistry/*microbiology Sodium Hydroxide Volatile Organic Compounds Waste Disposal, Fluid/*methods Atp Anaerobic digestion Vs/ts enzyme waste activated sludge;"
Notes:		"MedlineWang, Xiao Duan, Xu Chen, Jianguang Fang, Kuo Feng, Leiyu Yan, Yuanyuan Zhou, Qi eng Research Support, Non-U.S. Gov't England 2015/12/25 Environ Technol. 2016; 37(12):1520-9. doi: 10.1080/09593330.2015.1120783. Epub 2016 Jan 8"