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

Kejing Wang, Tan Wang, Changhao Yao, Rui Liu
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Abstract

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.
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二氧化氯预氧化对铜绿微囊藻胞内有机物氯化生成DBPs电位的影响
本文研究了预氧化对铜绿微囊藻(Microcystis aeruginosa)细胞内有机物后续氯化过程中消毒副产物(DBPs)形成的影响。结果表明:随着CIO2用量的增加,三氯甲烷(TCM)、二氯乙酸(DCAA)、三氯乙酸(TCAA)、二氯乙腈(DCAN)和三氯硝基甲烷(TCNM)的产率降低,水合氯醛(CH)、1,1 -二氯丙烷(1,1 - dcp)、1,1,1 -三氯丙烷(1,1,1 - TCP)的产率先升高后降低。随着pH的增加,TCM的产率增加,CH和TCNM的产率随pH从5到7的增加先增加后降低。其余5种dbp减少。随着预氧化时间的延长,DCAA、TCAA、DCAN和1,1 - dcp的产率降低,TCM、CH和1,1,1 - tcp的产率逐渐升高,TCNM的产率先升高后降低。随着温度的升高,DCAA、TCAA、TCM、CH和1,1,1 - tcp的产率升高,DCAN和1,1 - dcp的产率先升高后降低,TCNM的产率持续降低。当温度控制在20℃时,DCAN和1,1 - dcp的产率达到最大值。
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