Removal effect on Mesocyclops leukarti and mutagenicity with chlorine dioxide

• Published in: 环境科学学报(英文版) Vol. 18; no. 5; pp. 891 - 896
• Main Authors: ZUO Jin-long, CUI Fu-yi, QU Bo, ZHU Gui-bing
• Format: Journal Article
• Language: English
• Published: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China%Research Center for Eco-Environmental Sciences, China Academy of Sciences, Beijing 100085, China%School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090 2006; Research Center for Eco-Environmental Sciences, China Academy of Sciences, Beijing 100085, China, China
• Subjects: mutagenicity; chlorine dioxide; disinfection by-products (DBPs); Mesocyclops leukarti; preoxidation
• ISSN: 1001-0742; 1878-7320
• DOI: 10.3321/j.issn:1001-0742.2006.05.010

X703; Mesocyclops leukarti of zooplankton propagates excessively in eutrophic water body and it cannot be effectively inactivated by the conventional drinking water treatment process. In order to tackle this problem, a study of removal effect on Mesocyclops leukarti with chlorine dioxide in a waterworks was performed. The results showed that Mesocyclops leukarti could be effectively removed from water by 1.0 mg/L chlorine dioxide preoxidation combined with the conventional drinking water treatment process.Higher oxidizability and molecular state of chlorine dioxide in water is the key to the inactivation of Mesocyclops leukarti. The chlorite, disinfection by-products (DBPs) of chlorine dioxide, was stable at 0.45 mg/L, which is lower than that critical value of the USEPA. GC-MS examination showed that the quantity of organic substance in the water treated by chlorine dioxide obviously decreased. Ames test further revealed that the mutagenicity was reduced by chlorine dioxide with respect to prechlorine. The propagation ofMesocyclops leukarti can be inactivated effectively and safely by chlorine dioxide pre-oxidation.