青草沙原水不同亲疏水组分氯化过程中的有机氯胺生成与转化特性

Generation and Transformation of Organic Chloramines in Different Hydrophilicity and Hydrophobicity Fractions during Chlorination of Qingcaosha Reservoir Water

有机氯胺是由水中溶解性有机氮类物质经氯(胺)化消毒后,其氨基上的H被Cl取代后生成的一类消毒衍生物。有机氯胺是一种氯(胺)化消毒过程中的中间产物,是其它毒性更大的消毒副产物(DBPs)的前体物。本研究通过对比青草沙原水中不同亲疏水组分氯化过程中有机氯胺的生成情况,探明了有机氯胺的前体物组成特性,同时明晰了各组分产生的有机氯胺与后续产生的新兴含氮消毒副产物(N-DBPs)的转化关系。研究发现青草沙原水中弱疏水性物质最易生成有机氯胺,最大浓度为1.18 mg/L;随氯化反应进行,有机氯胺浓度与N-DBPs生成浓度总体成反比;强疏水性物质生成N-DBPs最多,主要为二溴一氯硝基甲烷(DBCNM),最大浓度为87.22μg/L。

Organic chloramines are one kind of disinfection derivatives produced by the substitution of H on the amino groups from dissolved organic nitrogen with Cl from free chlorine or chloramine.Organic chloramines have been proved to be a kind of disinfection intermediate products,which can be the precursors of other disinfection by-products(DBPs).This study contrasted the formation of organic chloramines during chlorination in different hydrophilicity and hydrophobicity distribution of Qingcaosha Reservoir and the formation of nitrogenous DBPs(N-DBPs).It was found that organic chloramines were most easily generated by transphilic compounds,the highest concentration was 1.18 mg/L.With the chlorination,the concentration of organic chloramines was in inverse proportion to the generation of N-DBPs.DBCNM were most easily generated by hydrophobic compounds during chlorination,which highest concentration was 87.22μg/L.