Currently, the interaction between contaminants and dissolved organic matter (DOM) during artificial groundwater recharge (AGR) with effluent from underutilized wastewater treatment plant (WWTP) is unclear. The present study investigated DOM evolution in this AGR scenario. The DOM composition in the inflow was identified to be distinct to that of the outflow due to the release of soil humic acid (HA). The soluble soil HA was then extracted and used in co-transport experiments with tetracycline (TC). The separated HA transport through the soil column exhibited high mobility with mass recovery >92.5% in the effluent. Following the mixing of injected TC and HA, the TC breakthrough in the column increased with HA concentration. TC was heavily adsorbed by the soil without the presence of HA, yet the retention ratios decreased from 63.60% to 53.30% for the HA range of 0–20 mg L⁻¹. An advection-dispersion-retention (ADR) numerical model was developed to effectively quantify the HA-TC co-transport, with results demonstrating the reduction in the TC attachment rate with increasing HA concentrations. Furthermore, batch adsorption experiments, kinetics and isotherms models, and FTIR spectra analysis were implemented to determine the underlying mechanism. The co-transport behavior was observed to be a function of the relative soil sorption affinity between HA and TC. The weaker sorption of the HA-coated TC compared to the separated TC consequently suggests that HA is likely to compete for available soil adsorption sites. Thus, the release of soil humus during AGR can potentially facilitate the transport of the introduced contaminants.

目前，利用未充分利用的废水处理厂（WWTP）的废水进行人工地下水补给（AGR）时，污染物与溶解有机物（DOM）之间的相互作用尚不清楚。本研究调查了这种AGR方案中的DOM演变。由于土壤腐殖酸（HA）的释放，流入物中的DOM成分与流出物中的DOM成分不同。然后提取可溶性土壤HA，并与四环素（TC）一起用于共运实验。通过土壤柱分离的HA转运表现出较高的迁移率，流出物中的质量回收率> 92.5％。注入的TC和HA混合后，随着HA浓度的增加，色谱柱中的TC突破量增加。TC在没有HA的情况下被土壤大量吸收，但保留率从63.60％降低至53。^–1。建立了对流弥散保留（ADR）数值模型以有效地量化HA-TC共运，结果表明随着HA浓度的增加，TC附着率降低。此外，还进行了批量吸附实验，动力学和等温线模型以及FTIR光谱分析，以确定潜在的机理。观察到共转运行为是HA和TC之间相对土壤吸附亲和力的函数。因此，与单独的TC相比，HA包被的TC的吸附力较弱，这表明HA可能竞争可用的土壤吸附位点。因此，AGR过程中土壤腐殖质的释放可能会促进所引入污染物的运输。