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首页> 外文期刊>Journal of Contaminant Hydrology >Fate of disinfection by-products in groundwater during aquifer storage and recovery with reclaimed water
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Fate of disinfection by-products in groundwater during aquifer storage and recovery with reclaimed water

机译：含水层储存和再生水回收过程中地下水中消毒副产物的去向

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Knowledge on the behaviour of disinfection by-products (DBPs) during aquifer storage and recovery (ASR) is limited even though this can be an important consideration where recovered waters are used for potable purposes. A reclaimed water ASR trial into an anoxic aquifer in South Australia has provided some of the first quantitative information at field-scale on the fate and transport of trihalomethanes (THMs) and haloacetic acids (HAAs). The results revealed that THM half-lives varied from <1 to 65 days, with persistence of chloroform being highest and bromoform lowest. HAA attenuation was rapid (<1 day). Rates of THM attenuation were shown to be highly dependent on the geochemical environment as evidenced by the 2-5 fold reduction in half-lives at the ASR well which became methanogenic during the storage phase of the trial, as compared to an observation well situated 4 m away, which remained nitrate-reducing. These findings agree with previous laboratory-based studies which also show persistence declining with increased bromination of THMs and reducing redox conditions. Modelling suggests that the chlorinated injectant has sufficient residual chlorine and natural organic matter for substantial increases in THMs to occur within the aquifer, however this is masked in some of the field observations due to concurrent attenuation, particularly for the more rapidly attenuated brominated compounds. The model is based on data taken from water distribution systems and may not be representative for ASR since bromide and ammonia concentrations in the injected water and the possible role of organic carbon in the aquifer were not taken into consideration. During the storage phase DBP formation potentials were reduced as a result of the removal of precursor material despite an increase in the THM formation potential per unit weight of total organic carbon. This suggests that water quality improvements with respect to THMs and HAAs can be achieved through ASR in anoxic aquifers.
机译：尽管在将回收水用于饮用水的情况下这可能是一个重要的考虑因素，但有关含水层存储和回收（ASR）期间消毒副产物（DBP）行为的知识是有限的。一项在南澳大利亚的缺氧含水层中进行的再生水ASR试验，提供了有关三卤甲烷（THMs）和卤代乙酸（HAA）的去向和转运的一些第一批定量信息。结果显示，THM半衰期从<1天到65天不等，其中氯仿的持久性最高，而溴仿的持久性最低。 HAA衰减很快（<1天）。 THM衰减速率显示出高度依赖于地球化学环境，ASR井的半衰期减少了2-5倍，这证明了THM衰减的速率，该半衰期在试验的存储阶段已变成产甲烷的，而观察井位于4 m处，硝酸盐仍在减少。这些发现与以前基于实验室的研究一致，该研究还显示持久性随着THM溴化的增加和氧化还原条件的降低而下降。建模表明，氯化注射液具有足够的残留氯和天然有机物，可在含水层内发生THM的大幅增加，但是由于同时发生衰减，特别是对于衰减较快的溴化化合物，这在某些现场观察中被掩盖了。该模型基于取自配水系统的数据，可能无法代表ASR，因为未考虑注入水中溴化物和氨的浓度以及含水层中有机碳的可能作用。在存储阶段，尽管每单位重量总有机碳的THM形成电位增加，但由于除去了前驱物材料，DBP形成电位降低了。这表明通过缺氧含水层中的ASR可以实现THM和HAA的水质改善。

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