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针对建筑小区的供水管道存在的生物作用等二次污染问题,研究了冲击氯消毒技术对DOC降解和硝化作用的控制效果以及对副产物溴酸盐的影响。结果表明,冲击氯消毒可有效控制DOC降解和硝化作用,生物降解作用明显减弱,可显著降低微生物超标的风险和威胁。停止冲击氯消毒后DOC降解和硝化作用逐步恢复,在冲击氯消毒后的第52~80天,DOC降解和硝化作用基本恢复到原有水平,因此有必要进行定期冲击氯消毒。冲击消毒后,Br O-3浓度总体呈现增加的趋势,但在冲击氯消毒第80天后,供水管道的生物作用限制了Br O-3的生成,因此在进行冲击氯消毒时,应考虑供水管道中相关消毒副产物的变化趋势以及可能造成的化学安全性风险。
In view of the secondary pollution such as the biological effect existing in the water supply pipeline in the construction area, the control effect of the impact chlorine disinfection technology on the degradation and nitrification of DOC and the influence on the byproduct bromate were studied. The results showed that the impact of chlorine disinfection can effectively control DOC degradation and nitrification, biodegradation significantly reduced, can significantly reduce the risk of microbial overdose and threats. After the impact of chlorinated disinfection, the degradation of DOC and the recovery of nitrification gradually resumed. On the 52th to 80th days after impact chlorine disinfection, the degradation and nitrification of DOC basically returned to their original levels. Therefore, it is necessary to perform periodic impact chlorine disinfection. After shock disinfection, the concentration of Br O-3 showed an overall trend of increase. However, after the 80th day of impact chlorine disinfection, the biological effect of the water supply pipe limited the generation of Br O-3. Therefore, during the impact chlorine disinfection, The trend of the related disinfection by-products and the possible risks of chemical safety.