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.
作者
官章琴
周斌
杨冯睿
吴志超
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)
出处
《净水技术》
CAS
2023年第5期84-92,101,共10页
Water Purification Technology
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
chlorine/ultraviolet(Cl/UV)
denitrification
membrane bioreactor(MBR)
response surface methodology(RSM)
disinfection by-products(DBPs)
作者简介
官章琴(1983-),女,硕士,研究方向为市政污水处理工艺研究与应用,E-mail:guanzhangqin@163.com;通信作者:周斌(1982-),男,研究方向为污水处理及污泥处理工艺,E-mail:zhoubin@shwwt.com。
