Using prechloramination to control trihalomethanes formation in River Huang water with high bromide |
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Authors: | TAO Hui CHEN Wei LIN Tao LIU Cheng CHEN Jie LI Gui-bai |
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Affiliation: | 1. Key Laboratory of Integrated Regulation and Resource Developmerit on Shallow Lakes,College of Environmental Science and Engineering,Hohai University,Nanjing 210098,China;School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China 2. Key Laboratory of Integrated Regulation and Resource Developmerit on Shallow Lakes,College of Environmental Science and Engineering,Hohai University,Nanjing 210098,China 3. Suzhou Litree Ultra-filtration Membrane Technology Co,.Ltd.,Suzhou 215000,China 4. School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China |
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Abstract: | An effective technology in controlling trihalomethanes (THMs)formation in the case of large amounts of bromide presenting wag proposed,and the water of River Huang seriously polluted by bromide in winter in Tianjin City wag studied.The THMs formation characteristics during prechloramination using preformed chloramines and convened chloramines were studied through jar tests.Results show that,in prechloramination process,the formation of THMs by preformed chloramines is very few,while that by converted chloramines is a little higher.And the formation of THMs,especially Br-substituted THMs,increases with tIle increase of time and Cl2:N ratio as well as the decrease of pH.The result obtained in a pilot plant shows that compared with preehlorination,the prechlommination process can efficiendy control the formation of THMs,especially the Br-substituted species.With equal chlorine dosage.the prechloramination can maintain a hrser chlorine residue which offers a larger CT value than prechlorination. |
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Keywords: | prechloramination trihalomethanes bromide pilot plant chemical security |
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