title: Understanding the role of extracellular polymeric substances in an enhanced biological phosphorus removal granular sludge system.
abstract: The role of extracellular polymeric substances (EPS) in the enhanced biological phosphorus removal (EBPR) process was investigated in a P-accumulating granular sludge system by analyzing the distribution and transfer of P, K(+), Mg(2+) and Ca(2+) in the sludge phase, EPS, and the bulk liquid. In the sludge phase, about 30% P, 44.7% K(+), 27.7% Mg(2+), 28% Ca(2+) accumulated in the EPS at the end of aeration. The rate of P, K(+), Mg(2+) and Ca(2+) released from the EPS matrix into the bulk liquid in the anaerobic phase was faster than the rate they were adsorbed from the bulk liquid into the EPS in the aerobic phase. P, K(+), Mg(2+) and Ca(2+) were retained in EPS before transferring into the phosphorus accumulating organisms (PAOs). These results suggest that EPS play a critical role in facilitating the accumulation and transfer of P, K(+), Ca(2+) and Mg(2+) between PAO cells and bulk liquid.
authors: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors: Randeng
authors: R
authors: Wang
authors: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: pyz@bjut.edu.cn.
authors: Yongzhen
authors: Y
authors: Peng
authors: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors: Zhanli
authors: Z
authors: Cheng
authors: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors: Nanqi
authors: N
authors: Ren
mesh_terms: D000327:Adsorption; D000332:Aerobiosis; D000693:Anaerobiosis; D001426:Bacterial Proteins / Q000032:analysis; D001673:Biodegradation, Environmental; D001704:Biopolymers / Q000378:metabolism*; D002118:Calcium / Q000032:analysis; D005110:Extracellular Space / Q000737:chemistry*; D008274:Magnesium / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*; D011135:Polysaccharides, Bacterial / Q000737:chemistry; D011188:Potassium / Q000032:analysis; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D012996:Solutions
chemical_list: D001426:Bacterial Proteins; D001704:Biopolymers; D011135:Polysaccharides, Bacterial; D012722:Sewage; D012996:Solutions; D010758:Phosphorus; D008274:Magnesium; D011188:Potassium; D002118:Calcium
keywords: EBPR granular sludge; EPS; Metal cations; Phosphorus; Transferring process