title: UASB reactor effluent disinfection by ozone and chlorine.
abstract: This research studied the sequential ozone and chlorine process with respect to, the inactivation of indicator bacteria and the formation of ozone disinfection byproducts in sanitary wastewater effluent. The applied ozone doses were 5, 8 and 10 mg.O3.L(-1), followed by chlorine doses of 10, 20 and 30 mg.L(-1), respectively. After the sequential ozone/chlorine process, the mean reduction in chemical oxygen demand ranged from 9 to 37%. Total coliform inactivation ranged from 1.59 to 3.73 log10, and E. coli was always <1 CFU 100 mL(-1). Ozonation resulted in the formation of aldehydes, which were not significantly impacted by the subsequent chlorine dose (P ≤ 0.05).
authors: a Department of Civil and Environmental Engineering, Faculty of Engineering of Bauru, Sao Paulo State University (UNESP) , Bauru - SP , Brazil.
authors: Gustavo Henrique
authors: GH
authors: Ribeiro da Silva
authors: Harry
authors: H
authors: Bruning
authors: Daniel
authors: D
authors: Gerrity
authors: Luiz Antonio
authors: LA
authors: Daniel
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D001938:Brazil; D002713:Chlorine / Q000737:chemistry / Q000494:pharmacology*; D004203:Disinfection / Q000379:methods*; D004926:Escherichia coli / Q000166:cytology / Q000187:drug effects / Q000254:growth & development; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008826:Microbial Sensitivity Tests; D010126:Ozone / Q000737:chemistry / Q000494:pharmacology*; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods
chemical_list: D012722:Sewage; D002713:Chlorine; D010126:Ozone
keywords: Byproducts; UASB reactor effluent; chlorine; disinfection; ozone