水中腐殖质在氯消毒工艺中的消毒副产物生成规律研究

A Study on the Formation of Disinfection Byproducts during Chlorination of Humic Substance in Water

以腐殖酸为目标前体物,深入探索不同影响因素(反应时间、pH和加氯量)对水中腐殖质类有机物氯化生成消毒副产物的影响规律,从基础理论上探究不同影响因素与消毒副产物产量之间的关系。研究发现,腐殖酸氯化反应产生的三氯甲烷在pH8时浓度最大,且随着反应时间的增大而增大;三氯硝基甲烷生成浓度随pH和反应时间的增大而增大。研究成果可以为饮用水氯化消毒工艺的优化应用提供技术与理论支撑。

Chlorination is a conventional disinfection process in drinking water treatment.Humic acid was chosen as the target precursor,and the effects of different influencing factors such as reaction time,pH value and chlorine dose on the formation of disinfection by-products were studied in the course of chlorination of humic substance in water so as to help understand the relationship between those different factors and the yield of disinfection by-products in theory.It was found that the concentration of trichloromethane in the chlorination reaction of humic acid would be the highest at pH 8 whilst increasing with the prolongation of reaction time.The concentration of trichloronitromethane would rise with the increase of pH value and reaction time.The research findings could provide technical and theoretical support for the optimal application of chlorination disinfection process.