饮用水预处理对含氮消毒副产物形成的影响。
Impacts of drinking water pretreatments on the formation of nitrogenous disinfection by-products.
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
出版信息
Bioresour Technol. 2011 Dec;102(24):11161-6. doi: 10.1016/j.biortech.2011.09.109. Epub 2011 Oct 2.
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) KMnO(4) 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 KMnO(4) 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 KMnO(4) 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.
研究了三种预处理工艺（i）粉末活性炭（PAC）吸附；（ii）高锰酸钾（KMnO4）氧化和（iii）生物接触氧化（BCO），结合常规水处理工艺后，氯化水中消毒副产物（DBPs）的形成情况，包括含氮 DBPs（N-DBPs）和含碳 DBPs（C-DBPs）。PAC 吸附可以有效地去除三氯甲烷（42.7%）、二氯乙腈（28.6%）、二氯乙酰胺（DCAcAm）（27.2%）和三氯硝基甲烷（35.7%）等氯仿的前体物，其去除效率高于 KMnO4 氧化和/或 BCO 预处理。BCO 工艺对溶解性有机碳的去除效率（76.5%）优于 PAC 吸附（69.9%）和 KMnO4 氧化（61.4%）。然而，BCO 增加了溶解性有机氮（DON）浓度，导致后续氯化过程中形成更多的 N-DBPs。BCO 工艺中产生了可溶性微生物产物，包括许多 DON 化合物，这些产物在 DCAcAm 的形成中起着重要作用。
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