典型有机氮化物对饮用水消毒卤乙腈生成量和耗氯量的影响

The Effects of Typical Nitrogenous Compounds on Haloacetonitriles Production and Chlorine Demand in Drinking Water Chlorination

以滤后水为本底,研究了其在氯化消毒过程中卤乙腈(HANs)的生成量,并考察了投氯量和pH值的影响。以甘氨酸、半胱氨酸、赖氨酸、亮氨酸、天门冬氨酸和甲胺6种物质为典型有机氮化物,研究了其对饮用水消毒过程中HANs生成量和耗氯量的影响。结果显示,HANs生成量与投氯量成正比、与pH值成反比。UFC结果显示滤后水本底HANs生成量为11.2μg.L-1;有机氮化物的存在会强化消毒过程中HANs的生成,强化作用与有机氮化物性质和含量有关;6种有机氮化物对HANs的影响顺序为天门冬氨酸(36.0μg.L-1)>甘氨酸(17.2μg.L-1)≈甲胺(17.0μg.L-1)>赖氨酸(14.0μg.L-1)≈亮氨酸(13.8μg.L-1)≈半胱氨酸(13.6μg.L-1);有机氮化物还能使耗氯量增加,增加值与有机氮化物性质和含量有关,多数有机氮化物所造成的耗氯量增加与其含量线性相关。

The haloacetonitriles （HANs） production during the process of filtered water chlorination and the effects of chlorine dosage and pH were studied. Glycine, cysteine, lysine, leucine, aspartic acid and methylamine were chosen as the typical nitrogenous compounds, and their effects on HANs production and chlorine demand were studied. The results showed that HANs production was directly proportional to chlorine dosage and inversely proportional to pH; UFC test showed the HANs production of ambient filtered water was 11.2μg·L^-1 ; the nitrogenous compounds would enhance the HANs production which was affected by their characteristics and concentration; the enhance effect rank order was as follow： aspartic acid （36.0μg·L^-1 〉 glycine （ 17.2μg·L^-1≈ methylamine （ 17.0μg·L^-1） 〉 lysine （ 14.0μg·L^-1） ≈ leucine （ 13.8μg·L^-1） ≈ cysteine （ 13.6 μg·L^-1 ） ; the nitrogenous compounds could also increase the chlorine demand which was controlled by their characteristics and concentration; the increase of chlorine demand caused by most of nitrogenous compounds was linear with their concentrations.