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液氯消毒工艺在制水生产中产生的DBPs一直是研究关注的重点。分别在夏季丰水期和冬季枯水期,对重庆市某常规加氯消毒工艺水厂出厂水的DBPs浓度变化进行监控研究。结果表明:冬季出厂水中DBPs浓度较低,无饮水风险;夏季二氯甲烷和三氯甲烷会随着清水池中水力停留时间的延长逐渐超标,分别在反应0.5 d和1.5 d达到峰值0.049 3 mg/L和0.079 2 mg/L。同时分析了不同气温和原水水质条件下,出厂水余氯值与TOC、高锰酸盐指数和菌落总数之间的变化关系。建议夏季丰水期该水厂采用二氧化氯消毒工艺,或可降低DBPs的产生。
DBPs generated by liquid chlorine disinfection process in the production of water have always been the focus of research. In the summer wet season and the winter dry season, the concentration of DBPs in the water of a conventional chlorination water plant in Chongqing was monitored. The results showed that the concentration of DBPs in the factory water in winter was low and there was no risk of drinking water. In summer, dichloromethane and trichloromethane gradually exceeded the hydraulic retention time in the clear water pool, reaching peak values of 0.049 3 mg / L and 0.079 2 mg / L. At the same time, the relationship between residual chlorine value, TOC, permanganate index and the total number of colonies was analyzed under different temperatures and raw water quality. It is suggested that chlorine dioxide disinfection process should be adopted for the waterworks in summer wet season, or the production of DBPs may be reduced.