水源水消毒副产物生成势与UV254/DOC的相关性研究

使用XAD-4和XAD-8树脂对宜兴3个水源原水中DOM进行亲疏水性分类,采用优化方法测定分类水样的DBPFP,并进行DBPFP与DOM量化指标之间的相关性分析,以确定实际生产过程DBPs生成量的主要影响因素.由三维荧光光谱图得到3个水源原水DOM组成差异较大,水质区别明显.由亲疏水性分类分析发现原水中疏水性和亲水性DOM含量较高,疏水性DOM水样的DBPFP大于原水,得到水样的DBPFP主要取决于DOM与消毒剂反应产生DBPs的效率,而不是DOM的量.引入UV_(254)/DOC这个指标,发现不同分类水样UV_(254)/DOC的差异情况与其DBPFP相吻合,对两者进行回归分析,发现水样THMFP和DHAAFP与UV_(254)/DOC之间存在明显的线性关系,线性可决系数R2分别为0.89和0.85.因此研究减小原水UV_(254)/DOC的技术工艺对于控制给水中DBPs浓度具有重要意义.

Study on the correlation between DBPFP and UV254/DOC of raw water

The dissolved organic matter (DOM) in raw water of three sources in Yixing was classified according to its hydrophilic-hydrophobic property by using XAD-4 and XAD-8 resin. Then disinfection byproduct forming potential (DBPFP) of the water samples was determined using optimized method. Finally, the correlation between DBPFP and quantitative index of DOM was analyzed to determine the main factor influencing DBPs production under practical condition. Significant difference of DOM composition in raw water of three sources was found in three-dimensional fluorescence spectra, indicating obviously different water quality. Also it was found that raw water was high in hydrophobic and hydrophilic DOM. For the DBPFP, hydrophobic DOM is higher than that of raw water, the DBPFP of water sample mainly depends on the reaction rate of DOM and disinfectant to generate DBPs instead of the amount of DOM. The concept of UV₂₅₄/DOC was put forward, and it was found that the variance trend of UV₂₅₄/DOC of different water samples coincides with DBPFP. Then regression analysis was conducted between DBPFP and UV₂₅₄/DOC. The result showed clear linear relationship between THMFP/DHAAFP and UV₂₅₄/DOC with linear correlation coefficients of 0.89 and 0.85 respectively. So it is very significant to research the technology on decreasing UV₂₅₄/DOC of raw water to control the concentration of DBPs in supplied water.