Characterization of isolated fractions of dissolved organic matter from sewage treatment plant and the related disinfection by-products formation potential.
Characterization of isolated fractions of dissolved organic matter from sewage treatment plant and the related disinfection by-products formation potential.
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DOI：
10.1016/j.jhazmat.2008.09.057
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发表时间：
2009-05
影响因子：
13.6
通讯作者：
Hua Zhang;J. Qu;Huijuan Liu;Xu Zhao
中科院分区：
文献类型：
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作者：
Hua Zhang;J. Qu;Huijuan Liu;Xu Zhao
采用树脂吸附分离常规污水处理厂出水中的溶解有机物(DOM)，将其分为疏水碱(HOB)、疏水酸(HOA)和疏水中性物(HON)、亲水碱(Hib)、亲水酸(HIA)和亲水中性物(Hin)六类。有机酸是DOM中含量最丰富的部分。疏水性有机物，特别是疏水酸，具有较高的总消毒副产物形成潜力(DBPFP)。此外，电势随酸、中性和碱的顺序而降低。采用紫外分光光度(UV254)、荧光光谱、尺寸排阻色谱和傅里叶变换红外光谱(FTIR)对DOM组分进行了表征。并详细讨论了DOM组分的性质与相应的DBPFP的关系。结果表明，UV254与DOC的比值(SUVA)与卤代乙酸(HAAs)的生成势呈正相关，而与三卤代甲烷(THMS)的生成势之间没有明显的线性相关性。在DOM中所含的荧光有机物中，腐植酸的氯反应活性高于黄腐酸。腐植酸分子越小，产生的DBP越多。此外，含ν(CO)基团的芳香族结构和脂肪族结构的结合对DBPs的形成有很大贡献。
Dissolved organic matter (DOM) in effluent from a conventional sewage treatment plant was isolated using resin adsorbents into six classes: hydrophobic bases (HoB), hydrophobic acids (HoA) and hydrophobic neutrals (HoN); hydrophilic bases (HiB), hydrophilic acids (HiA) and hydrophilic neutrals (HiN). Organic acids were the most abundant fractions of DOM. Hydrophobic organics especially hydrophobic acids were found to have higher overall disinfection by-products formation potential (DBPFP). Moreover, the potential decreased as the sequence of acids, neutrals and bases. Ultraviolet spectrophotometry at 254nm (UV254), fluorescence spectroscopy, size exclusion chromatography and Fourier transform infrared spectroscopy (FTIR) were employed to characterize DOM fractions. And the relationship between the characteristics of DOM fractions and the related DBPFP was discussed in detail. It was found that UV254to DOC ratio (SUVA) exhibited a positive correlation with haloacetic acids (HAAs) formation potential whereas distinctive linear correlation was not observed between SUVA and trihalomethanes (THMs) formation potential. Of the fluorescence organics contained in DOM, humic acids exhibited higher chlorine reactivity than fulvic acids. Smaller molecules of humic acids produced more DBPs. Furthermore, a combination of aromatic moieties and aliphatic structures with ν(CO) groups contributed largely to the formation of DBPs.