title: Stimulating short-chain fatty acids production from waste activated sludge by nano zero-valent iron.
abstract: An efficient and green strategy, i.e. adding nano zero-valent iron into anaerobic fermentation systems to remarkably stimulate the accumulation of short-chain fatty acids from waste activated sludge via accelerating the solubilization and hydrolysis processes has been developed. In the presence of nano zero-valent iron, not only the short-chain fatty acids production was significantly improved, but also the fermentation time for maximal short-chain fatty acids was shortened compared with those in the absence of nano zero-valent iron. Mechanism investigations showed that the solubilization of sludge, hydrolysis of solubilized substances and acidification of hydrolyzed products were all enhanced by addition of nano zero-valent iron. Also, the general microbial activity of anaerobes and relative activities of key enzymes with hydrolysis and acidification of organic matters were improved than those in the control. 454 high-throughput pyrosequencing analysis suggested that the abundance of bacteria responsible for waste activated sludge hydrolysis and short-chain fatty acids production was greatly enhanced due to nano zero-valent iron addition.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Jingyang
authors.initials: J
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Research & Service Center for Environmental Industry, Yancheng 224051, Jiangsu Province, China. Electronic address: leiyufeng_tj@yahoo.com.
authors.forename: Leiyu
authors.initials: L
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China. Electronic address: yinguangchen@yahoo.com.
authors.forename: Yinguang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Naidong
authors.initials: N
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Dongbo
authors.initials: D
authors.lastname: Wang
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000378:metabolism*; D005285:Fermentation; D057166:High-Throughput Screening Assays; D007501:Iron / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D012722:Sewage / Q000382:microbiology*
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D007501:Iron
keywords: 454 high-throughput pyrosequencing; Anaerobic fermentation; Nano zero-valent iron; Short-chain fatty acids; Waste activated sludge