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目的:了解烟台市政供水中消毒副产物(CDBPs)污染状况及季节分布,寻找有效控制消毒副产物生成量的水处理方式。方法:选取水源水、水厂水及末梢水等进行调查研究,对主要消毒副产物三卤甲烷(THMs)和卤乙酸(HAAs),以及pH、游离余氯、水温进行监测。通过控制氯投入量的干预措施,了解不同余氯浓度下水中CDBPs的变化情况。结果:目前烟台市政供水中消毒副产物指标未超出GB5749-2006饮用水卫生要求,但一氯二溴甲烷含量偏高。水厂水余氯夏季应保持在0.6 mg/L～0.7 mg/L,冬季节应在0.4 mg/L～0.5 mg/L,春秋季应在0.5 mg/L～0.6 mg/L为宜。结论:目前烟台市政供水中消毒副产物指标污染状况不严重;消毒副产物的产生量随季节有所不同,夏季最高,冬季最低;减少或避免预氯化,不同季节按各自适宜的用量投氯,可有效降低消毒副产物的产生量,有效控制二次污染。
Objective: To understand the pollution status and seasonal distribution of disinfection byproducts (CDBPs) in Yantai municipal water supply, and to find out the water treatment methods that can effectively control the generation of disinfection byproducts. Methods: Water source, water and peripheral water were selected for investigation. THMs, HAAs, pH, free residual chlorine and water temperature were monitored. By controlling the amount of chlorine intervention interventions to understand the different concentrations of residual CDBPs in water changes. Results: At present, the indicator of by-product disinfection in Yantai municipal water supply did not exceed the sanitary requirements of drinking water GB5749-2006, but the content of chlorinated dibromomethane was high. Water plant residual chlorine in summer should be maintained at 0.6 mg / L ~ 0.7 mg / L, the winter season should be 0.4 mg / L ~ 0.5 mg / L, spring and autumn should be 0.5 mg / L ~ 0.6 mg / L is appropriate. Conclusions: At present, the indicator of disinfection by-products in municipal water supply is not serious. The amount of disinfection by-products produced varies with the seasons, with the highest in summer and the lowest in winter. Chlorination can be reduced or avoided. Chloride can be dosed at the appropriate dosage in different seasons , Can effectively reduce the amount of disinfection by-products, effective control of secondary pollution.