Formation of Disinfection by Products From the Chlorination of Chironomid Larvae Metabolite Dissolution

Chironomid larvae occure in urban water supply systems, and their metabolite dissolutions containing biomass of amino acids, protein, fat and other organic matter have a higher potential to form the DBPs. In order to provide a theoretical basis for their impact on water quality and safety, we changed the different conditions like chlorine dosage, reaction time, pH and temperature to research the formation of disinfection by-products from the chlorination of chironomid larvae metabolite dissolution. The results showed that they reacted with chlorine to form chloral hydrate (CH) , 1, 1, 1-trichloroethane (1, 1, 1-TCA) 1, 1-dichloro-2-propanone (1, 1-DCP) and 1, 1, 1-trichloro-2-propanone (1, 1, 1-TCP) during disinfection. Higher chlorine dosage resulted in an increase of CH, 1, 1, 1-TCA and 1, 1, 1-TCP, but 1, 1-DCP concentration was increased at first and then decreased. Longer reaction time could accumulated CH, 1, 1, 1-TCA and 1, 1-DCP, but too long time could made 1, 1, 1-TCP decompose. Increasing pH was benefit to form chloral hydrate, 1, 1-DCP and 1, 1, 1-TCP, the maximum concentration of 1, 1, 1-TCA occurred at pH 7. And the four disinfection by-products concentrations were all increasing with temperature increasing.