输水管材质对二氧化氯饮用水消毒的影响研究

目的研究输水管材质对二氧化氯饮用水消毒的影响。方法将0.8mg/L的二氧化氯溶液分别注入已充分清洗的无规共聚聚丙烯水管、硬质聚氯乙稀水管、镀锌钢管、铜水管、聚乙烯水管等5种管材中,避光密封浸泡48小时,并分别于浸泡1、2、3、4、5、6、12、24和48小时测定二氧化氯、亚氯酸盐浓度和氯酸盐浓度。结果各管材浸泡水中二氧化氯衰减率均随浸泡时间的增加而增大,且二氧化氯衰减主要发生在浸泡开始后的6小时内。但不同管材对二氧化氯的衰减影响不同,金属管材对二氧化氯消耗影响比塑料管材更大;而且在浸泡试验开始后的2个小时内,铜管和镀锌管中亚氯酸盐浓度迅速增大,并达到浓度的最大值,但随后亚氯酸盐浓度急剧减少,在浸泡24小时后管内浸泡水中已检测不到亚氯酸盐,其他塑料管材浸泡水中亚氯酸盐生成浓度均随浸泡时间的延长而增加;各管材浸泡水氯酸盐浓度与浸泡实验开始时相比均无明显变化。结论输水管材质对二氧化氯饮用水消毒有影响。

Study on pipe material's influence on chlorine dioxide drinking water disinfection

Objective To study the pipe material's influence on chlorine dioxide drinking water disinfection.Methods 0.8mg/L chlorine dioxide solution was injected into 5 kinds of pipes respectively,PPR,PVC-U,Steel with Zinc Coating,copper and PE pipes.Dipped free from light for 48 hours and the concentrations of chlorine dioxide,chlorite and chlorate were tested from samples taken from each kind of pipe at 1,2,3,4,5,6,12,24 and 48 hours respectively.Results Chlorine dioxides decay rates in the water dipping the pipes increase as the dipping time increases and the decay of chlorine dioxide mainly occurs within 6 hours after the dipping.But for different pipe,the influence of decay differs.The consumption of chlorine dioxide of the metal pipes is more than that of the plastic pipes.And with 2 hours after the dipping experiment begins,the concentrations of the chlorite of the copper pipe and of the steel with zinc coating pipe increase quickly and reach the maximum concentration.But then the chlorite concentration decreases greatly.After dipped 24 hours,the chlorite in the water in the pipe can not be detected.For other plastic piples,all the chlorite concentrations in the dipping water increase as the dipping time increase.Compared with the start of the dipping experiment,the chlorate concentration in the dipping water of each pipe has no obvious change.Conclusion The material of the water transportation pipe does have influence on chlorine dioxide drinking water disinfection.