In this work, a numerical model was developed with the aim to study the effect of drying period (DP) duration on the biogeochemical state of a soil aquifer treatment (SAT) system, and to enhance its functionality accordingly. The model was calibrated and verified using data series from long‐column experiments, and sensitivity analysis was performed. Considering unsaturated water flow, air movement, solute transport, and the main microbial‐mediated kinetic reactions relevant to SAT, we examined outflow quality and reaction rates in response to seven DP durations while the flooding period (FP) durations were kept constant. The results show that extension of the aerobically active region occurs in response to longer DPs and suggest that very long DPs (>3 times the FPs) may not pose further advantage compared with medium‐length DPs (2.5–3 times the flooding periods). A simple optimization process was demonstrated for the experimental SAT system presented, considering outflow quality vs. infiltrated volume. An optimum was obtained at DP/FP ratio of ∼2.8. Although these results are system specific, similar biogeochemical models may be modified and used for hydraulic operation optimization in other SAT sites.

中文翻译：

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使用反应运输模型优化土壤含水层处理（SAT）操作

在这项工作中，开发了一个数值模型，旨在研究干燥期（DP）持续时间对土壤含水层处理（SAT）系统的生物地球化学状态的影响，并相应地增强其功能。使用来自长柱实验的数据序列对模型进行了校准和验证，并进行了敏感性分析。考虑到不饱和水流量，空气流动，溶质运移以及与SAT相关的主要微生物介导的动力学反应，我们在7个DP持续时间保持不变的情况下，考察了响应7个DP持续时间的流出质量和反应速率。结果表明，需氧活性区域的扩展是对较长的DP的响应，并且表明，与中等长度的DP相比，非常长的DP（> FP的3倍）可能没有进一步的优势（2。洪水时期的5–3倍）。考虑到流出质量与渗透量的关系，对所展示的实验SAT系统演示了一个简单的优化过程。在DP / FP比约为2.8时可获得最佳值。尽管这些结果是系统特定的，但是可以修改相似的生物地球化学模型并将其用于其他SAT站点中的液压操作优化。