title: Reduction of excess sludge production in sequencing batch reactor through incorporation of chlorine dioxide oxidation.
abstract: In this study, chlorine dioxide (ClO(2)) instead of chlorine (Cl(2)) was proposed to minimize the formation of chlorine-based by-products and was incorporated into a sequencing batch reactor (SBR) for excess sludge reduction. The results showed that the sludge disintegrability of ClO(2) was excellent. The waste activated sludge at an initial concentration of 15 g MLSS/L was rapidly reduced by 36% using ClO(2) doses of 10mg ClO(2)/g dry sludge which was much lower than that obtained using Cl(2) based on similar sludge reduction efficiency. Maximum sludge disintegration was achieved at 10mg ClO(2)/g dry sludge for 40 min. ClO(2) oxidation can be successfully incorporated into a SBR for excess sludge reduction without significantly harming the bioreactor performance. The incorporation of ClO(2) oxidation resulted in a 58% reduction in excess sludge production, and the quality of the effluent was not significantly affected.
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration area, College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, PR China.
authors.forename: Guanghua
authors.initials: G
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Sui
authors.forename: Huishan
authors.initials: H
authors.lastname: Shen
authors.forename: Shukun
authors.initials: S
authors.lastname: Liang
authors.forename: Xiangming
authors.initials: X
authors.lastname: He
authors.forename: Minju
authors.initials: M
authors.lastname: Zhang
authors.forename: Yizhong
authors.initials: Y
authors.lastname: Xie
authors.forename: Lingyun
authors.initials: L
authors.lastname: Li
authors.forename: Yongyou
authors.initials: Y
authors.lastname: Hu
mesh_terms: D019149:Bioreactors; D017606:Chlorine Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D012722:Sewage
chemical_list: D017606:Chlorine Compounds; D010087:Oxides; D012722:Sewage; C025109:chlorine dioxide