氯/紫外工艺辅助MBR出水应急脱氮  

Supplementary Emergency Denitrification for MBR Effluent by Cl/UV Process

作　　者：官章琴 周斌 杨冯睿 吴志超[3] GUAN Zhangqin;ZHOU Bin;YANG Fengrui;WU Zhichao(Shanghai Zizheng Environmental Technology Co.,Ltd.,Shanghai 200086,China;Shanghai Chengtou Wastewater Treatment Co.,Ltd.,Shanghai 201203,China;School of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海子征环保科技有限公司,上海200086 [2]上海城投污水处理有限公司,上海201203 [3]同济大学环境科学与工程学院,上海200092

出　　处：《净水技术》2023年第5期84-92,101,共10页Water Purification Technology

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。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.

关 键 词：氯/紫外(Cl/UV) 脱氮 膜生物反应器(MBR) 响应曲面法 消毒副产物 

分 类 号：TU991[建筑科学—市政工程]