Impacts of drinking water pretreatments on the formation of nitrogenous disinfection by-products

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• 作者：Wenhai Chu^a ; Naiyun Gao^a ;   ; ^{feedwater@126.com} ;   ; ^{feedwater@yahoo.cn} ; Yang Deng^b ; Michael R. Templeton^c ; Daqiang Yin^a
• 关键词：Nitrogenous disinfection by-products (N-DBPs) ; Biological contact oxidation (BCO) ; Powdered activated carbon (PAC) ; Soluble microbial product (SMP) ; Haloacetamides (HAcAms)
• 刊名：Bioresource Technology
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：102
• 期：24
• 页码：11161-11166
• 全文大小：1098 K

文摘

The formation of disinfection by-products (DBPs), including both nitrogenous DBPs (N-DBPs) and carbonaceous DBPs (C-DBPs), was investigated by analyzing chlorinated water samples following the application of three pretreatment processes: (i) powdered activated carbon (PAC) adsorption; (ii) KMnO₄ oxidation and (iii) biological contact oxidation (BCO), coupled with conventional water treatment processes. PAC adsorption can remove effectively the precursors of chloroform (42.7 % ), dichloroacetonitrile (28.6 % ), dichloroacetamide (DCAcAm) (27.2 % ) and trichloronitromethane (35.7 % ), which were higher than that pretreated by KMnO₄ oxidation and/or BCO process. The removal efficiency of dissolved organic carbon by BCO process (76.5 % ) -was superior to that by PAC adsorption (69.9 % ) and KMnO₄ oxidation (61.4 % ). However, BCO increased the dissolved organic nitrogen (DON) concentration which caused more N-DBPs to be formed during subsequent chlorination. Soluble microbial products including numerous DON compounds were produced in the BCO process and were observed to play an essential role in the formation of DCAcAm in particular.