title: Dewaterability of five sewage sludges in Guangzhou conditioned with Fenton's reagent/lime and pilot-scale experiments using ultrahigh pressure filtration system.
abstract: Sludge conditioning with Fenton's reagent and lime is a valid method for sludge dewatering. This study investigated the influence of different organic matter content sludge on sludge dewatering and discussed the main mechanism of sludge conditioning by combined Fenton's reagent and lime. The results indicated that the specific resistance to filterability (SRF) of sludge was reduced efficiently by approximately 90%, when conditioned with Fenton's reagent and lime. Through single factor experiments, the optimal conditioning combinations were found. In addition, the relationship between VSS% and consumption of the reagents was detected. Furthermore, it was also demonstrated that the SRF and filtrate TOC values had a significant correlation with VSS% of sludge (including raw and conditioned). The main mechanism of sludge dewatering was also investigated. Firstly, it revealed that the dewaterability of sludge was closely correlated to extracellular polymeric substances (EPS) and bound water contents. Secondly, the results of scanning electron microscopy (SEM) stated that sludge particles were to be smaller and thinner after conditioning. And this structure could easily form outflow channels for releasing free water. Additionally, with the ultrahigh pressure filtration system, the water content of sludge cake conditioned with Fenton's reagent and lime could be reduced to below 50%. Moreover, the economic assessment shows that Fenton's reagent and lime combined with ultrahigh pressure filtration system can be an economical and viable technology for sewage sludge dewatering. Finally, three types of sludge were classified: (1) Fast to dewater; (2) Moderately fast to dewater; (3) Slow to dewater sludge.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Jialin
authors.initials: J
authors.lastname: Liang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Shaosong
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Yongkang
authors.initials: Y
authors.lastname: Dai
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: sysun@gdut.edu.cn.
authors.forename: Shuiyu
authors.initials: S
authors.lastname: Sun
mesh_terms: D005374:Filtration / Q000379:methods*; D006861:Hydrogen Peroxide; D007501:Iron; D008855:Microscopy, Electron, Scanning; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D012722:Sewage; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Dewaterability; Fenton's reagent; Lime; Sewage sludges; Ultrahigh pressure filtration