原位空气扰动技术影响因素研究-基于苯污染非均质含水层

通过一维模拟柱实验，研究了分层非均质含水层下不同介质组合对原位空气扰动技术修复苯污染地下水的影响.结果表明：在曝气流量为0.1 L/min，分层非均质的介质渗透系数在同一数量级时，分层情况的改变对污染物的去除效率影响不大；当分层非均质的介质渗透系数不在同一数量级时，下层渗透系数变大会使砂柱上层污染物浓度先升高后降低的现象更加明显，而下层渗透系数变小会使砂柱上下层污染物的去除效率相差不大.分层情况下不同介质组合影响苯的平均去除效率，在分层非均质条件下，气流由低渗透介质进入高渗透介质，污染物的去除速率相对更快，污染物的平均去除效率主要取决于分层非均质上层介质，其污染物平均去除效率曲线与分层非均质上层介质均质大致相同.

Study on the influence factors of in situ air sparging based on benzene contaminated heterogeneous aquifer

Column experiments were conducted to investigate the effects of different medium combinations on the benzene removal for contaminated groundwater by air sparging in the stratified heterogeneous aquifer. The results indicated that with the aeration flow 0.1L/min, the stratification changes of the aquifer had little effect on the removal efficiency of pollutants when the hydraulic conductivities (K) were in the same order of magnitude in the aquifer. When the hydraulic conductivities were not in the same order of magnitude, the larger K in lower part of the aquifer could cause obvious increase of contaminant content in the upper part during the early sparging period. While the smaller K in lower part of the aquifer made no big difference for the removal efficiencies between upper and lower part of the aquifer. In hierarchical cases, the combination of different media also affected the average benzene removal efficiencies. In the stratified heterogeneous aquifer, the air flow from the low permeable medium to high permeable medium, the removal rate of pollutants was relatively faster, and the average removal efficiency of pollutants mainly depended on the hydraulic conductivity of upper medium and the average contaminant removal efficiency of layered heterogeneous aquifer was roughly the same as the removal efficiency in upper layer medium.