管材对Cl2-ClO2联合消毒亚氯酸盐生成情况的影响

为了解氯／二氧化氯联合消毒方式对消毒副产物的影响,提高供水的安全可靠性,使用静态管段反应器进行实验,选取3种常用管材,研究氯／二氧化氯联合消毒时,管材对氯／二氧化氯联合消毒过程中亚氯酸盐生成情况的影响．结果表明:对于两种联合消毒方式,各种情况下均在PVC管中亚氯酸盐的生成量最高,而在金属管材中较低．不同之处在于:混合投加氯和二氧化氯过程中,随着混合消毒剂中二氧化氯所占比例的缩小,氯所占比例的增加,铸铁管中亚氯酸盐的生成量逐渐增加．而先加氯再加二氧化氯的情况是亚氯酸盐生成量始终是铸铁高于不锈钢．

Effects of pipe material on chlorite formation in combined disinfection of chlorine and chlorine dioxide

To know the effects of combined disinfection on DBPs and enhance water quality safety, static pipe reactors were used and three kinds of commonly used pipe materials were selected to investigate the effects of pipe materials on chlorite formation in combined disinfection of chlorine and chlorine dioxide. Results indicated that the chlorite levels were the highest in PVC pipe and lower in metal pipes for both of the two kinds of combined disinfection. The difference between the two ways was that in the way of adding chlorine and chlorine dioxide together, chlorite levels in the ductile iron pipe increased with the increase of chlorine and decrease of chlorine dioxide in the mixed disinfectant. While, for the way of adding chlorine first and then adding chlorine dioxide, the chlorite levels were higher in ductile iron pipe than that in stainless steel from the beginning to the end.