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首页> 外文会议>World Environmental and Water Resources Congress >Spatial and Seasonal Variations of Disinfection Byproduct (DBP) Precursors in Relation with Total Organic Carbon (TOC)
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Spatial and Seasonal Variations of Disinfection Byproduct (DBP) Precursors in Relation with Total Organic Carbon (TOC)

机译：与总有机碳（TOC）相关的消毒副体（DBP）前体的空间和季节变异

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Disinfection is an essential process for both potable water and wastewater treatment plants. However, disinfection byproducts (DBPs) like trihalomethanes (THMs), haloacetonitriles (HANs), and nitrosamines (NOAs) are formed when organic matter precursors react with disinfectants such as chlorine, chloramine, and ozone. Formation of DBPs is strongly associated with the type of water source, type of disinfectant, and organic matter concentration, which can have seasonal variation. In this study, water samples were collected from 20 different intra-watershed locations, which included urban runoff (with and without the influence of unsheltered homeless populations), wastewater effluent discharges, and a large, terminal reservoir that serves as the local drinking water source. Samples were collected on dry and rainy days, which represent seasonal samples. DBP formation potential (FP) tests were conducted at consistent pH, contact time, and temperature. THMs, NOAs, and HANs were analyzed by gas chromatography-mass spectrometry (GC-MS). The FP tests performed on these water samples revealed that chlorine formed the highest THM concentrations, while THM concentrations were low for the ozone FP test as expected. Chloramine produced the greatest HAN concentrations, with dichloroacetonitrile representing the highest concentration. With respect to sample type, more DBPs were formed at the non-wastewater-impacted runoff sites as compared to the wastewater effluent discharge sites. With respect to TOC levels, rain event samples for all locations had higher TOC concentrations compared to dry sampling days. Similarly, rain event samples showed increased DBP formation; a significant amount of precursors for THMs was found in runoff waters that were influenced by wastewater effluent discharges and unsheltered homeless locations (concentration of total THMs for chlorine FP test was ＞200 μg/L). Therefore, urban runoff waters should be considered as potential sources of DBP precursors to drinking water source waters, and runoff water is prone to seasonal variation.
机译：消毒是两个饮用水和污水处理厂的一个必要过程。然而，当有机物质前体与消毒剂如氯，氯胺和臭氧反应消毒副产物（消毒副产物），如三卤甲烷（三卤甲烷），卤代乙腈（汉斯）和亚硝胺（NOAS）形成。消毒副产物的形成强烈地水源，消毒剂的类型和有机物质浓度的类型，其可具有季节变化相关联。在这项研究中，水样品从20个不同的帧内流域位置，其中包括城市径流（有和没有无遮蔽无家可归群体的影响），废水流出物的排放，和作为本地饮用水源的大的，终端储存器中收集。样品收集于干燥，阴雨天，这代表季节性样本。 DBP的形成电势（FP）试验是在pH值一致，接触时间和温度下进行。三卤甲烷，NOAS，和Hans通过气相色谱法 - 质谱法（GC-MS）进行分析。对这些水样进行的FP试验显示，氯形成的最高浓度THM，而THM浓度如预期很低的臭氧FP试验。氯胺产生最大的HAN浓度，与表示最高浓度二氯乙腈。相对于样品的类型，在非废水影响径流位点相比于废水流出物排放位点形成更消毒副产物。对于TOC水平，为所有地点雨事件的样品相比，干取样天有较高的TOC浓度。同样地，显示出雨事件样品增加DBP形成;三卤甲烷为前体的量显著在通过废水流出物排放和无遮蔽无家可归位置影响径流水域被发现（三卤甲烷总量为氯FP试验的浓度为> 200微克/升）。因此，城市径流水应该被认为是前体的DBP的潜在来源到饮用水源的水，和径流水是容易的季节性变化。

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