title: Enhancing anaerobic digestion of waste activated sludge by pretreatment: effect of volatile to total solids.
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.
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Wang
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Xu
authors.initials: X
authors.lastname: Duan
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Jianguang
authors.initials: J
authors.lastname: Chen
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Kuo
authors.initials: K
authors.lastname: Fang
authors.affiliation: 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.
authors.forename: Leiyu
authors.initials: L
authors.lastname: Feng
authors.affiliation: 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.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Yan
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D000693:Anaerobiosis; D001105:Archaea; D006863:Hydrogen-Ion Concentration; D008697:Methane; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D012972:Sodium Hydroxide; D055549:Volatile Organic Compounds; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D055549:Volatile Organic Compounds; D012972:Sodium Hydroxide; D008697:Methane
keywords: ATP; Anaerobic digestion; VS/TS; enzyme; waste activated sludge