Influencing factors on dissolved organic halide in urban water supply

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°C 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.