三卤甲烷和卤乙腈类消毒副产物在14个饮用水厂出水中的浓度水平及原水氯化/氯胺化中的生成势

Occurrence of trihalomethanes and haloacetonitriles in finshed drinking water from 14 drinking water treatment plants and their formation potential during chlorination and chloramination

选取长江、黄河、太湖、海河和辽河流域14个饮用水厂,对出厂水中4种三卤甲烷(THM4)和4种卤乙腈(HAN4)消毒副产物的浓度水平进行了调查,同时评价了原水氯化、氯胺化条件下上述消毒副产物的生成势。结果表明,14个饮用水厂出厂水中THM4和HAN4的浓度范围分别为23.45~57.04μg·L^(-1)和ND^3.29μg·L^(-1),均符合我国《生活饮用水卫生标准》(GB 5749-2006)的要求。氯化消毒实验中THM4生成势和HAN4生成势范围分别为56.18~183.38μg·L^(-1)和ND^5.98μg·L^(-1);氯胺消毒实验中THM4生成势和HAN4生成势范围分别为4.47~33.84μg·L^(-1)和0.88~5.3μg·L^(-1),与氯消毒相比THM4生成势平均减少86%,HAN4生成势增加61%。生成势结果显示原水中溶解性有机碳(DOC)含量与THM4生成势有良好的相关性,氯和氯胺消毒过程中r2分别为0.69和0.81。

In this study samples were collected from 14 drinking water plants for a disinfection by-products con- centration level survey and DBPs formation potential test （DBPsFP） were carried out to determine the triha- lomethanes and haloacetonitriles formed by chlorination and chlorimination of raw water. Concentration levels of THM4 and HAN4in finished water were 23.45 -57.04 μg·L-1, and ND -3.29 μg·L-1 respectively and com- pletely met the Standards for Drinking Water Quality. During chlorination, the range of THM4FP and HAN4FP were 56. 18 -183.38μg· L-1 and ND -5.98μg·L-1 respectively; the range of THM4FP and HAN4FP were 4.47 - 33.84 μg· L-1 and 0.88 - 5.3μg· L-1 during ehloramination. Compared to chlorine, ehloramination generally reduced the concentration of THM4 by 86% , while increased the HAN4 formation by 61% during for- mation potential test. And THM4FP is correlate well with DOC in raw water, the r2 was 0.69 and 0.81 during chlorination and chloramination.