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采用消毒剂二氧化氯(ClO2)进行二次供水水质消毒试验研究,考察了ClO2投加量、氨氮、CODMn和pH对ClO2的衰减及氯酸盐和亚氯酸盐消毒副产物生成的影响,并建立了氯酸盐(ClO3-)和亚氯酸盐(ClO2-)生成质量浓度的预测经验模型。结果表明,当原水CODMn<4.20 mg/L、氨氮的质量浓度<0.582 mg/L、pH在6.5～8.5、水中投加0.05mg/L的ClO2、HRT为48 h时,一定的液位降泵启动,消毒副产物在监测12 h内不超过GB 5749-2006的规定,并在水箱中基本检测不到微生物的存在。相同条件下,若ClO2投加量大于0.70 mg/L时,消毒副产物则可能超标。
Disinfection experiments of secondary water supply with chlorine dioxide (ClO2) as disinfectant were conducted. The effects of ClO2 dosage, ammonia nitrogen, CODMn and pH on the decay of ClO2 and the generation of chlorate and chlorite byproducts were investigated. A prediction model of the mass concentration of chlorite (ClO3-) and chlorite (ClO2-) was established. The results showed that when the raw water CODMn <4.20 mg / L, ammonia nitrogen concentration <0.582 mg / L, pH 6.5 ~ 8.5, 0.05mg / L ClO2 and HRT 48 h, Start-up, disinfection by-products within 12 h monitoring does not exceed the provisions of GB 5749-2006, and in the tank basically undetectable microorganisms. Under the same conditions, if the dosage of ClO2 is more than 0.70 mg / L, disinfection by-products may exceed the standard.