title: Disinfection of bore well water with chlorine dioxide/sodium hypochlorite and hydrodynamic cavitation.
abstract: The effect of hydrodynamic cavitation (HC) on potable water disinfection of chemicals was investigated. The bore well water was introduced into HC set-up to examine the effect of HC alone and combination of HC and chemicals such as chlorine dioxide and sodium hypochlorite. The effect of inlet pressure and geometrical parameters on disinfection was studied using HC alone and the results showed that increasing inlet pressure and using more and bigger holes of orifice plates can result in a higher disinfection rates. When HC was combined with chemicals, HC can reduce the doses of the chemicals and shorten the time of disinfection. It was also found that the decrease in bacteria concentration followed a first-order kinetic model. As for the experiment of combination of HC and sodium hypochlorite for disinfection, HC not only improves the disinfection rate but also degrades natural organic matter and chloroform. Compared with only sodium hypochlorite disinfection, combined processes get higher disinfection rate and lower production of chloroform, particularly the pretreatment with HC enhances the disinfection rate by 32% and there is a simultaneous reduction in production of chloroform by 39%.
authors.affiliation: a College of Environment and Energy , South China University of Technology , Guangzhou 510006 , People's Republic of China.
authors.forename: Yifei
authors.initials: Y
authors.lastname: Wang
authors.forename: Aiyin
authors.initials: A
authors.lastname: Jia
authors.forename: Yue
authors.initials: Y
authors.lastname: Wu
authors.forename: Chunde
authors.initials: C
authors.lastname: Wu
authors.forename: Lijun
authors.initials: L
authors.lastname: Chen
mesh_terms: D018407:Bacterial Physiological Phenomena / Q000187:drug effects* / Q000528:radiation effects; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D017606:Chlorine Compounds / Q000737:chemistry / Q000494:pharmacology*; D004202:Disinfectants / Q000737:chemistry / Q000494:pharmacology; D004203:Disinfection / Q000379:methods*; D060587:Groundwater / Q000032:analysis / Q000737:chemistry / Q000382:microbiology*; D019220:High-Energy Shock Waves; D010087:Oxides / Q000737:chemistry / Q000494:pharmacology*; D012973:Sodium Hypochlorite / Q000737:chemistry / Q000494:pharmacology*; D013010:Sonication / Q000379:methods*; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods
chemical_list: D017606:Chlorine Compounds; D004202:Disinfectants; D010087:Oxides; C025109:chlorine dioxide; D012973:Sodium Hypochlorite
keywords: chlorine dioxide; chloroform; hydrodynamic cavitation; pretreatment; sodium hypochlorite; water disinfection