基于疏水性能及相对分子质量分析消毒副产物前体物

Analysis of disinfection by-product precursors based on hydrophobicity and molecular weight

采用XAD树脂吸附法和超滤膜技术分别将水中的天然有机物(NOM)分成不同疏水性能和不同相对分子质量(MW)的各种组分。对低SUVA值水中,SUVA值与消毒副产物(DBPs)的关系也进行了研究。结果表明,与疏水酸性物质(HPOA)和转亲酸性物质(TPHA)相比,亲水酸性物质(HPIA)是水体中天然有机物(NOM)的主要组成部分,约占58%,对DBPs的贡献也最大。另一方面,MW<2 000组分是水体中NOM的主要组成部分,约占60%,同时也是生成DBPs的主要前体物质,对三氯甲烷生成势(TCMFP)、二氯乙酸生成势(DCAAFP)和三氯乙酸生成势(TCAAFP)的贡献分别为50.5%、39.6%和41.2%。SUVA值与DBPs生成量的相关性较差。

Natural organic matter（NOM） in source water was fractionated into different groups based on hydrophobicity and molecular weight（MW） by using ultrafiltration technologies and XAD resins respectively.The relationship between SUVA values and disinfection by-products（DBPs） in low SUVA value water was also studied.The results showed that hydrophilic acid（HPIA） fraction was predominant in source water,approximately 58% and played the most important role in the formation of DBPs,compared with hydrophobic acid（HPOA） and tansphilic acid（TPHA） fractions.On the other hand,MW2 000 fraction was the main organic component of NOM（amount for 60%） and the most significant precursor of DBPs,which contributed about 50.5%,39.6% and 41.2% to chloroform,dichloroacetic acid and trichloroacetic acid formation potential,respectively.There was poor correlation between SUVA value and the formation of DBPs.