Impact of Chlorine Dioxide Pre-Oxidation on DBPs Formation Potential from Chlorination of Intracellular Organic Matter of Microcystis Aeruginosa

In this paper, the impact of pre-oxidation on the formation of disinfection by-products (DBPs) during subsequent chlorination of intracellular organic matter of Microcystis aeruginosa was investigated. The results showed that with the increase of CIO2 dosage, the yields of trichloromethane (TCM), dichloroacetic acid (DCAA), trichloroacetic acid (TCAA), dichloro acetonitrile (DCAN) and trichloronitromethane (TCNM) decrease, while the yields of chloral hydrate (CH), 1, 1-dichloro propanone (1, 1-DCP), 1, 1, 1-trichloro propanone (1, 1, 1- TCP) increase firstly and then decrease. With the pH increasing, the yields of TCM increase, and the yields of CH and TCNM increase with the pH increasing from 5 to 7, then decreased. The remaining 5 species of DBPs decrease. With the pre-oxidation time prolonging, the yields of DCAA, TCAA, DCAN and 1, 1-DCP decrease, the yields of TCM, CH and 1, 1, 1-TCP gradually increase, while the yields of TCNM was increased firstly and then decreased. With the increase of temperature, the yields of DCAA, TCAA, TCM, CH and 1, 1, 1-TCP increase, the yields of DCAN and 1, 1-DCP increase firstly and then decrease, while the yield of TCNM decrease continuously. When the temperature is controlled at 20°C, the yields of DCAN and 1, 1-DCP reach the maximum value.