摘要
部分净水厂中存在的氨氮浓度过高的现象,采用传统的折点加氯工艺去除氨氮可能会导致消毒副产物超标。针对以上问题,为有效地去除氨氮并通过降低氯氮比消减消毒副产物的产生风险,提出在水处理工艺消毒阶段的前端增加紫外辐射系统,以构成氯/紫外耦合工艺去除氨氮。研究结果表明,应用氯/紫外耦合工艺在氯氮比3:1,紫外辐射光强180μW/cm^(2)时,紫外辐射时间为213 s,氨氮去除率78%。与折点加氯工艺相比,紫外/氯耦合工艺不仅可高效去除氨氮,同时可有效控制消毒副产物生成量,是一种可有效去除氨氮并控制消毒副产物生成量的新型工艺。在水厂实际运行中,可根据进水氨氮及有机物浓度等调整氯/紫外运行方式,灵活应用此工艺。
High levels of ammonia nitrogen was detected in some water purification plants,but using the traditional break point chlorination process to remove ammonia nitrogen may lead to excessive disinfection by-products.To solve these problems,this study proposes to add an UV system at the front end of the disinfection stage of water treatment process to form a UV/chlorine process to remove ammonia nitrogen.The experimental results showed that the ammonia removal rate could achieve 78%at the chlorine and nitrogen mass ratio at 3:1,UV irradiation 180μW/cm^(2) and the UV radiation time 213 s.Compared with the chlorination process,the combined UV/chlorine process can effectively remove ammonia nitrogen and control the formation of disinfection by-products.These results evidenced that the combined UV and chlorine process was an alternative method for ammonia degradation.In the actual operation of the water treatment plant,the dosing sequence and mode of UV and chlorine can be adjusted according to the influent ammonia nitrogen and organic matter concentration,and this process can be applied flexibly.
作者
王筱菊
杨东赫
李伟光
张欣然
WANG Xiaoju;YANG Donghe;LI Weiguang;ZHANG Xinran(Beijing Institute of Water,Beijing 100048,China;Shanghai Investigation,Design&Research Institute Co.,Ltd,Shanghai 200434,China;Harbin Institute of Technology,Harbin 150090,China;Sun Yat-sen University,Guangzhou 510275,China)
出处
《北京水务》
2022年第2期52-57,共6页
Beijing Water
关键词
氨氮
氯
紫外
氯氮比
ammonia nitrogen
chlorine
UV
chlorine-nitrogen ratio
