【摘 要】
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Chlorine dioxide(ClO2)disinfection usually does not produce halogenated disinfection by-products,but the formation of the inorganic by-product chlorite(ClO2-)is
【机 构】
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Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Enviro
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Chlorine dioxide(ClO2)disinfection usually does not produce halogenated disinfection by-products,but the formation of the inorganic by-product chlorite(ClO2-)is a serious consid-eration.In this study,the ClO2-formation rule in the ClO2 disinfection of drinking water was investigated in the presence of three representative reductive inorganics and four natural organic matters(NOMs),respectively.Fe2+and S2-mainly reduced ClO2 to ClO2-at low con-centrations.When ClO2 was consumed,the ClO2-would be further reduced by Fe2+and S2-,leading to the decrease of ClO2-.The reaction efficiency of Mn2+with ClO2 was lower than that of Fe2+and S2-.It might be the case that MnO2 generated by the reaction between Mn2+and ClO2 had adsorption and catalytic oxidation on Mn2+.However,Mn2+would not reduce ClO2-.Among the four NOMs,humic acid and fulvic acid reacted with ClO2 actively,followed by bovine serum albumin,while sodium alginate had almost no reaction with ClO2.The maximum ClO2-yields of reductive inorganics(70％)was higher than that of NOM(around 60％).The lower the concentration of reductive substances,the more ClO2-could be pro-duced by per unit concentration of reductive substances.The results of the actual water samples showed that both reductive inorganics and NOM played an important role in the formation of ClO2-in disinfection.
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