Full-scale study of removal effect on Cyclops of zooplankton with chlorine dioxide

Article type: Research Article

Authors: LIN, Tao | CUI, Fu-yi | LIU, Dong-mei | AN, Dong

Affiliations: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: Cyclops of zooplankton propagated excessively in eutrophic water body and could not be effectively inactivated by the conventional disinfections process like chlorination due to its stronger resistance to oxidation. In this paper, a full-scale study of chlorine dioxide preoxidation cooperating with routine clarification process for Cyclops removal was conducted in a waterworks. The experimental results were compared with that of the existing prechlorination process in several aspects: including the Cyclops removal efficiencies of water samples taken from the outlets of sedimentation tank and sand filter and the security of drinking water etc. The results showed that chlorine dioxide might be more effective to inactivate Cyclops than chlorine and Cyclops could be thoroughly removed from water by pre-dosing chlorine dioxide process. The GC-MS examination and Ames test further showed that the sort and amount of organic substance in the treated water by chlorine dioxide preoxidation were evidently less than that of prechlorination and the mutagenicity of drinking water treated by pre-dosing chlorine dioxide was substantially reduced compared with prechlorination.

Keywords: Cyclops of zooplankton, chlorine dioxide, chlorine, preoxidation, water treatment

Journal: Journal of Environmental Sciences, vol. 16, no. 5, pp. 746-750, 2004