摇蚊幼虫代谢产物生成氯化消毒副产物的特征

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

摇蚊幼虫出现在城市净水工艺中,且其代谢产物中含有蛋白质、脂肪及氨基酸等消毒副产物前质,为了给其对水质安全的影响提供理论依据,在改变不同的投氯量、反应时间、pH和温度的条件下,对摇蚊幼虫代谢产物生成氯化消毒副产物的特征进行研究.结果表明:摇蚊幼虫在氯化消毒过程中产生水合氯醛(CH)、1,1,1-三氯乙烷(1,1,1-TCA)、1,1-二氯丙酮(1,1-DCP)和1,1,1-三氯丙酮(1,1,1-TCP).CH、1,1,1-TCA及1,1,1-TCP随着投氯量增加呈逐渐上升趋势,而1,1-DCP生成量先增加后减少;延长氯化反应时间,CH、1,1,1-TCA以及1,1-DCP的质量浓度增加,而1,1,1-TCP的质量浓度先增加后减少;pH的增加有利于减少CH、1,1-DCP和1,1,1-TCP的生成量,而1,1,1-TCA的质量浓度呈现先增加后减少的趋势,在pH为7时出现最大值;温度升高导致4种消毒副产物的生成量增加.

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 llke 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, l, 1-trichloroethane （ 1,1 , 1- TCA） 1,1-dichloro-2-propanone （1,1-DCP） and !, 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.