title: Role of extracellular polymeric substances in enhancement of phosphorus release from waste activated sludge by rhamnolipid addition.
abstract: This study investigated the role of extracellular polymeric substances (EPSs) in enhanced performance of phosphorus (P) release from waste activated sludge (WAS) by adding rhamnolipid (RL). Results showed that compared to WAS without pretreatment, the released PO4(3-)-P increased with RL addition from 0 to 0.2 g/gTSS (total suspended solid), and increased by 208% under the optimal condition (0.1 g RL/g TSS and 72-h fermentation time). The cumulative PO4(3-)-P was better fitted with pseudo-first-order kinetic model. Moreover, the contents of metal ions increased in liquid but decreased in EPSs linearly with RL addition increasing, and WAS solubilizations were positively correlated with the released metal ions. The enhanced total dissolved P mainly came from cells and others (69.39%, 2.27-fold higher than that from EPSs), and PO4(3-)-P was the main species in both liquid and loosely bound EPSs, but organic P should be non-negligible in tightly bound EPSs.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), P.O. Box 2614, 202 Haihe Road, Harbin 150090, China.
authors.forename: Zhang-Wei
authors.initials: ZW
authors.lastname: He
authors.affiliation: Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, China.
authors.forename: Wen-Zong
authors.initials: WZ
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), P.O. Box 2614, 202 Haihe Road, Harbin 150090, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), P.O. Box 2614, 202 Haihe Road, Harbin 150090, China.
authors.forename: Chun-Xue
authors.initials: CX
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), P.O. Box 2614, 202 Haihe Road, Harbin 150090, China.
authors.forename: Ze-Chong
authors.initials: ZC
authors.lastname: Guo
authors.affiliation: College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, China.
authors.forename: Ai-Juan
authors.initials: AJ
authors.lastname: Zhou
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai, China.
authors.forename: Jian-Yong
authors.initials: JY
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), P.O. Box 2614, 202 Haihe Road, Harbin 150090, China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, China. Electronic address: waj0578@hit.edu.cn.
authors.forename: Ai-Jie
authors.initials: AJ
authors.lastname: Wang
mesh_terms: D001704:Biopolymers / Q000494:pharmacology*; D005110:Extracellular Space / Q000737:chemistry*; D006017:Glycolipids / Q000494:pharmacology*; D007700:Kinetics; D008962:Models, Theoretical; D010710:Phosphates / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification*; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D014865:Waste Disposal, Fluid
chemical_list: D001704:Biopolymers; D006017:Glycolipids; D010710:Phosphates; D012722:Sewage; C418382:rhamnolipid; D010758:Phosphorus
keywords: Extracellular polymeric substances; Phosphorus release; Rhamnolipid; Species; Waste activated sludge