title: Alkyl polyglucose enhancing propionic acid enriched short-chain fatty acids production during anaerobic treatment of waste activated sludge and mechanisms.
abstract: Adding alkyl polyglucose (APG) into an anaerobic treatment system of waste activated sludge (WAS) was reported to remarkably improve the production of short-chain fatty acids (SCFAs), especially propionic acid via simultaneously accelerating solubilization and hydrolysis, enhancing acidification, inhibiting methanogenesis and balancing carbon to nitrogen (C/N) ratio of substrate. Not only the production of SCFAs, especially propionic acid, was significantly improved by APG, but also the feasible operation time was shortened. The SCFAs yield at 0.3 g APG per gram of total suspended solids (TSS) within 4 d was 2988 ± 60 mg chemical oxygen demand (COD) per liter, much higher than that those from sole WAS or sole WAS plus sole APG. The corresponding yield of propionic acid was 1312 ± 25 mg COD/L, 7.9-fold of sole WAS. Mechanism investigation showed that during anaerobic treatment of WAS in the presence of APG both the solubilization and hydrolysis were accelerated and the acidification was enhanced, while the methanogenesis was inhibited. Moreover, the activities of key enzymes involved in WAS hydrolysis and acidification were improved through the adjustment of C/N ratio of substrates with APG. The abundance of microorganisms responsible for organic compounds hydrolysis and SCFAs production was also observed to be greatly enhanced with APG via 454 high-throughput pyrosequencing analysis.
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: Han
authors.initials: H
authors.lastname: Sun
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: Qiuting
authors.initials: Q
authors.lastname: Shen
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D005936:Glucans / Q000378:metabolism*; D009930:Organic Chemicals / Q000737:chemistry*; D052638:Particulate Matter / Q000737:chemistry*; D011422:Propionates / Q000378:metabolism; D012722:Sewage / Q000737:chemistry; D013501:Surface-Active Agents / Q000378:metabolism*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D005232:Fatty Acids, Volatile; D005936:Glucans; D009930:Organic Chemicals; D052638:Particulate Matter; D011422:Propionates; D012722:Sewage; D013501:Surface-Active Agents; D062065:Wastewater; D014874:Water Pollutants, Chemical; C029658:propionic acid
keywords: Alkyl polyglucose; Carbon to nitrogen ratio; Propionic acid; Short-chain fatty acids; Waste activated sludge