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Isolation of dissolved organic matter in effluents from sewage treatment plant and evaluation of the influences on its DBPs formation

机译：污水处理厂废水中溶解性有机物的分离及其对DBPs形成的影响的评估

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Dissolved organic matter (DOM) in reclaimed water from a conventional sewage treatment plant was isolated using resin adsorption chromatography technique into six classes: hydrophobic bases (HoB), hydrophobic acids (HoA), hydrophobic neutrals (HoN), hydrophilic bases (HiB), hydrophilic acids (HiA) and hydrophilic neutrals (HiN). It was found that organic acids dominated in reclaimed water and the ratios of UV_(254) (absorbance at 254 nm) to dissolved organic carbon (DOC) (SUVA_(254)) ratio exhibited a common relationship: HoA > reclaimed water > HiA, The influences of chemical structures and experimental conditions on the formation of disinfection by-products (DBPs) were investigated, respectively. SUVA_(254) was found to exhibit a positive and statistically significant correlation with DBPs formation potential. The specific trihalomethanes (THMs) and haloacetic acids (HAAs) formation potential decreased as the same sequence: acids, neutrals and bases. The formation of DBPs depended more on a combination of aromatic moieties and aliphatic structures such as hydroxy acids. Furthermore, THMs formed more easily at alkaline conditions; however, hydrophobic organics formed HAAs more easily at acidic conditions, whereas hydrophilic organics achieved relatively high HAAs at both acidic and strong alkaline conditions. Moreover, the observed rate constant for HAAs formation was larger than the rate constant for THMs formation. Addition of ammonia nitrogen (NH4-N) changed chlorine to chloramines with lower oxidation potential, and correspondingly influenced the formation of DBPs especially at the chlorination breakpoint.
机译：使用树脂吸附色谱技术将常规污水处理厂中再生水中的溶解有机物（DOM）分为六类：疏水性碱（HoB），疏水性酸（HoA），疏水性中性（HoN），亲水性碱（HiB），亲水性酸（HiA）和亲水性中性（HiN）。结果发现，再生水中有机酸占主导地位，UV_（254）（在254 nm处的吸光度）与溶解有机碳（DOC）的比（SUVA_（254））之比呈现出以下共同关系：HoA>再生水> HiA，分别研究了化学结构和实验条件对消毒副产物（DBPs）形成的影响。发现SUVA_（254）与DBPs的形成潜力呈正相关且在统计上具有显着相关性。特定的三卤甲烷（THMs）和卤乙酸（HAA）的形成潜力以相同的顺序降低：酸，中性和碱。 DBP的形成更多地取决于芳族部分和脂族结构如羟基酸的组合。此外，THM在碱性条件下更容易形成。然而，疏水性有机物在酸性条件下更容易形成HAAs，而亲水性有机物在酸性和强碱性条件下均能获得相对较高的HAAs。此外，观察到的HAAs形成的速率常数大于THMs形成的速率常数。氨氮（NH4-N）的添加将氯变成具有较低氧化电位的氯胺，并相应地影响了DBP的形成，特别是在氯化断裂点。

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