State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Chemosphere. 2021 Jul;274:129796. doi: 10.1016/j.chemosphere.2021.129796. Epub 2021 Jan 28.
In areas that experience frequent fluctuations in groundwater levels, changes in soil void space caused by fluctuations in groundwater levels directly affect the efficacy of soil vapor extraction (SVE). Most studies of SVE technology of oil-contaminated soil remediation do not consider fluctuations in groundwater levels. Here, we constructed an experimental device to study the removal of benzene by SVE under fluctuating groundwater levels. Key parameters affecting the remediation effect of SVE, such as the extraction flow, extraction time, extraction method, initial soil moisture content and initial pollutant content, were studied to characterize their effects on the efficacy of benzene removal by SVE under stable and fluctuating groundwater levels. The removal rate of benzene by SVE was approximately 10% higher under fluctuating water levels than under stable water levels. Extraction flow can directly change the removal rate under fluctuating groundwater levels. Under fluctuating groundwater levels, the removal effect of SVE on benzene in different soils of the "stabilization zone - fluctuation zone - saturation zone" also significantly differed; specifically, the removal effect of SVE in the fluctuation zone and stabilization zone was superior to that in the saturation zone. Given the fluctuation in groundwater levels at the study site, the remediation.
在地下水水位频繁波动的地区，地下水水位波动引起的土壤空隙空间变化直接影响土壤蒸气抽提（SVE）的效果。大多数受污染土壤修复的 SVE 技术研究都没有考虑地下水水位的波动。在这里，我们构建了一个实验装置来研究在地下水水位波动下 SVE 对苯的去除。研究了影响 SVE 修复效果的关键参数，如抽取流量、抽取时间、抽取方法、初始土壤湿度和初始污染物含量，以表征它们对稳定和波动地下水条件下 SVE 去除苯的效果的影响。在波动水位下，SVE 去除苯的去除率比稳定水位下高约 10%。抽取流量可以直接改变波动地下水位下的去除率。在波动的地下水位下，SVE 对“稳定区-波动区-饱和区”不同土壤中苯的去除效果也有显著差异；具体而言，波动区和稳定区的 SVE 去除效果优于饱和区。鉴于研究地点的地下水水位波动，修复。
