泳池水内三氯甲烷前体物的物化表征

Physical and chemical characterization of trichloromethane precursor in swimming pool water

含氯消毒剂能和游泳池水中溶解性有机物作用产生三氯甲烷等副产物威胁人类健康。采用分子量切割法和树脂分离法对重庆市某室内恒温游泳池水中有机物进行物理和化学分级表征,测定分级后研究各组分DOC、UV_(254)和三氯甲烷的生成势。研究表明,游泳池水中主要为相对分子质量在1kDa以内的亲水性有机物,但三氯甲烷主要前体物为分子量在1k~3kDa酸性疏水性有机物。为有效减少泳池水中消毒副产物产生,泳池水处理工艺应该主要去除水中疏水酸性有机物,特别是1k~3kDa的疏水酸性有机物。

Dissolved organic matter(DOM)in swimming pool water can react with chlorinated disinfectant to produce harmful disinfection by-products like trichloromethane(TCM).In this study,water sample was collected from an indoor swimming pool in Chongqing.Molecular weight distribution and resin fractionation were conducted to classify the components of DOM in water for DOC,UV_(254)and trichloromethane formation potentials determination.The results indicate that hydrophilic organic matter,which its molecular weight is less than 1kDa,is dominated in swimming pool water.The main precursor of chloroform is acidic hydrophobic organic matter with molecular weight of 1k~3kDa.Therefore,removal of hydrophobic acidic organic matter,especially hydrophobic acidic organic matter of 1k~3kDa could be an effective method to reduce the production of disinfection by-products in pool water.