供水管网中溶解性有机卤化物形成影响因素

Influencing factors on dissolved organic halide in urban water supply

摘要:

为研究供水管网中的溶解性有机卤化物(DOX)的形成,采用配水管网模拟装置及静态试验管段进行模拟研究.通过研究消毒过程和模拟管网运行,研究各因素对DOX形成的影响.结果表明,加氯消毒过程中,DOX的生成量随UV254和Br-质量浓度的增加而增加,随氨氮质量浓度的增加而减小.在静态试验管段中,在20℃、pH=8.6时,腐蚀产物可使DOX的生成量降低7.5%,初步分析是由pH值的不稳定性引起的.而管材对DOX生成量的影响从大到小顺序为:PVC管>不锈钢管>球墨铸铁管.相同流经距离或相同停留时间下,流速为0.6m/s时DOX的生成量最小.

Abstract:

Simulation on water distribution network system and static pipe section reactor was carried out to study the formation of dissolved organic halide in water supply pipes.And the effect factors were studied.The results show that DOX increases with UV254 and Br-,but decreases with the increase of ammonia nitrogen.Static pipe wall experiments show that,when the temperature is 20℃ and pH is 8.6,corrosion products inhibit the formation of DOX and make it reduced by 7.5%.This may be caused by the unstable pH value.The impact of pipe material on DOX is as follows:PVC pipe > stainless steel pipe > ductile cast iron pipe.Under the same distance or the same retention time,the generation of DOX is the lowest at the velocity of 0.6 m/s.