城市饮用水中消毒副产物三氯乙醛生产量的影响因素研究

Study on the influence factors on three-chlorine acetaldehyde production in urban drinking water treatment

研究水中三氯乙醛生成量的影响因素,并比较水厂出厂水的三氯乙醛实际数据,试验结果表明:反应水温对三氯乙醛生成量的影响较大,且两者呈较好的线性关系,水厂实际运行数据显示夏季水温高时出厂水中三氯乙醛有较高的超标风险。pH对三氯乙醛的生成量无影响。在1.0mg/L、1.5mg/L、2.0mg/L、2.5mg/L NaClO(以有效氯计)投加量下,水中三氯乙醛生成量呈现先增高后降低趋势,且在1.5mg/LNaClO投加量下三氯乙醛浓度出现峰值达到6.72μg/L。反应时间对三氯乙醛的生成量影响较大,12h内随着反应时间的延长,三氯乙醛浓度逐渐增加,12h后随着反应时间的延长反而有所降低,在12h的反应时间时出现峰值达到16.08μg/L。

This paper studied the influence factors on three-chlorine acetaldehyde production in water and compared then with the actual data of three-chlorine acetaldehyde production in effluent from water treatment plant.The experimental results showed that the water temperature had great influence on three-chlorine acetaldehyde formation and there was linear relationship between them;the water treatment plant operation data showed that in summer,there was high risk of exceeding standard of three-chlorine acetaldehyde concentration in effluent from water treatment plant.There was little impact from pH on three-chlorine acetaldehyde production.When the dosage of NaClO changed as 1.0mg/L,1.5mg/L,2.0mg/L and 2.5mg/L（with effective chlorine）respectively,the three-chlorine acetaldehyde production increased first and then decreased;the three-chlorine acetaldehyde concentration peak reached 6.72μg/L when the dosage of NaClO was 1.5mg/L.The reaction time had great impact on three-chlorine acetaldehyde production;in the first 12 hours,the three-chlorine acetaldehyde production would increase with the extension of reaction time and its peak reached 16.08μg/L at the 12hours;after that,it would decline gradually.