【摘要】 氯/紫外（Cl/UV）工艺十分适合低有机物污水的应急脱氮处理。文中研究了Cl/UV工艺辅助膜生物反应器（MBR）脱氮的效果和影响因素，并研究确立了最佳工艺参数。结果表明，Cl/UV工艺可以在相同Cl/N下，实现比折点氯化更好的脱氮效果、更低的出水余氯含量。工艺进水的pH值在6.5～8.0对处理效果没有显著影响。当进水氨氮质量浓度<12 mg/L时，采用Cl/UV工艺比折点氯化更经济，此时可以通过文中公式计算最佳Cl/N。过高的进水COD_Cr（>50 mg/L）会导致所需Cl/N增加，且Cl/UV工艺对COD_Cr的去除效果不佳。Cl/UV工艺产生的消毒副产物主要为三氯甲烷、三氯乙烷、三氯乙醛和二氯乙腈，生成量随Cl/N的增大而增大，随初始氨氮浓度和UV强度的增大而下降。更多还原

【Abstract】 The chlorine/ultraviolet（Cl/UV） process is suitable for emergency ammonia nitrogen removal for wastewater of low organic pollutant concentration. In this paper, the performance and influence factors of the Cl/UV process on ammonia nitrogen removal for membrane bioreactor（MBR） effluent were studied, and the optimum process parameters were determined. The results indicated that with the same Cl/N, a superior ammonia removal efficiency, as well as a lower total chlorine concentration of the effluent, was achieved by Cl/UV process relative to breakpoint chlorination. The fluctuation of influent pH value within the range of 6.5～8.0 did not affect the treatment efficiency significantly. When the influent ammonia concentration was less than 12 mg/L, the Cl/UV process was considered more economical than breakpoint chlorination, and an optimum Cl/N could be calculated by the fitted equation given in this paper. An excessively high influent COD_Cr（>50 mg/L） would lead to an increase in the required Cl/N and the Cl/UV process was not effective in removing COD_Cr. The disinfection by-products from the Cl/UV process were mainly trichloromethane, trichloroethane, trichloroacetaldehyde and dichloroacetonitrile, whose concentration increased with a higher Cl/N and a lower influent ammonia concentration as well as UV dosage.更多还原