title: Characteristics of water obtained by dewatering cyanobacteria-containing sludge formed during drinking water treatment, including C-, N-disinfection byproduct formation.
abstract: This is the first study to systematically investigate the characteristics of the water obtained by dewatering cyanobacteria-containing sludge generated in the drinking water treatment plant, including formation of C- and N-disinfection by-products (DBPs). Results showed that this 'dewatering water' (DW) had different properties when the sludge was stored at different times. The content of dissolved organic matter (DOM) and microcystins (MCs) in the DW were low when the sludge was treated or disposed of within 4 days; correspondingly, the C-, N-DBP production was also low. However, due to the damage of algal cells to some extent, the DOM and MC levels increased significantly for storage time longer than 4 days; the production of C-, N-DBPs also increased. There were also obvious differences in the characteristics of the DW from sludges generated with different coagulant species. Due to the better protective effect of FeCl3and polymeric aluminium ferric chloride (PAFC) flocs, the DOM and MC levels and the production of C-, N-DBPs in the DW with FeCl3and PAFC coagulation were lower than those with AlCl3coagulation, even though the sludges were stored for the same amount of time. Furthermore, because of the formation of Al and Fe hydroxides, precipitated onto the surface of flocs, the soluble Al and Fe in the DW decreased with increased storage time, especially in the first four days. Overall, this study revealed the trends in variation of DW quality for cyanobacteria-containing sludges formed with different coagulants, then FeCl3and PAFC coagulants are recommended and sludge should be treated or disposed of within 4 days.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
authors.forename: Hangzhou
authors.initials: H
authors.lastname: Xu
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China; Shandong Provincial Engineering Center on Environmental Science and Technology, Jinan, 250061, China. Electronic address: haiyanhup@126.com.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Pei
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Jin
authors.affiliation: School of Physics, Shandong University, 250100, China.
authors.forename: Hongdi
authors.initials: H
authors.lastname: Xiao
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
authors.forename: Chunxia
authors.initials: C
authors.lastname: Ma
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
authors.forename: Jiongming
authors.initials: J
authors.lastname: Sun
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
authors.forename: Hongmin
authors.initials: H
authors.lastname: Li
mesh_terms: D000458:Cyanobacteria; D004203:Disinfection; D060766:Drinking Water; D012722:Sewage; D018508:Water Purification
chemical_list: D060766:Drinking Water; D012722:Sewage
keywords: Cyanobacteria-containing sludge; Dewatering; Disinfection by-product; Microcystins