Affiliations: School of Municipal and Environmental Engineering,
Harbin Institute of Technology, Harbin 150090, China | Water Research Institute, Shenzhen Water Group,
Shenzhen 518001, China | State Key Laboratory of Environmental Aquatic
Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of
Sciences, Beijing 100085, China | Heilongjiang Province Light Industrial Science
Research, Harbin 150010, China
Abstract: Chironomid larvae propagated excessively in eutrophic water body and
could not be effectively inactivated by the conventional disinfection process
like chlorination due to its stronger resistance to oxidation. In this paper, a
pilot-scale study of chlorine dioxide preoxidation cooperating with routine
clarification process for Chironomid larvae removal was conducted in Shenzhen
Waterworks in Guangdong Province, China. The experimental results were compared
with that of the existing prechlorination process in several aspects, including
the Chironomid larvae removal efficiencies of water samples taken from the
outlets of sedimentation tank, sand filter, the security of drinking water and
so on. The results showed that chlorine dioxide might be more effective to
inactivate Chironomid larvae than chlorine and Chironomid larvae 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 ofprechlorination and the mutagenicity of drinking water treated
by pre-dosing chlorine dioxide was substantially reduced compared with
prechlorination.
Keywords: Chironomid larvae, chlorine dioxide, chlorine, preoxidation, water treatment
