Method for controlling pollution to underground water and restoring soil in aeration zone in contaminated site

Abstract

The invention discloses a method for controlling pollution to underground water and restoring soil in an aeration zone in a contaminated site. The method comprises the following steps: laying a capillary barrier above an aquifer for underground water at a lower part of the contaminated site; digging a trench both at an upper part and at the lower part of the contaminated site; processing the trenches; and laying a capillary barrier top cover on the surface layer of soil of the contaminated site and arranging draining pipelines in the surface layer of soil, wherein the draining pipelines are located above the capillary barrier top cover and connected with a rainwater purifying device, and a downstream trench is connected with a sewage treating device through a waste water pumping pipeline. The method provided in the invention can prevent pollutants from polluting underground water, realize leaching restoration of contaminated soil in the aeration zone and achieve the effect of utilization of rainwater. For reduction in cost, a geological environment with a natural water-proof layer beneath can be chosen during site selection of a factory. The method provided in the invention has the advantages of long duration of controlling, a good pollution controlling effect and relatively low cost.

Description

technical field [0001] The invention relates to groundwater pollution prevention and control technology, in particular to a method for preventing groundwater pollution in polluted sites and restoring vadose zone soil. Background technique [0002] With the acceleration of urbanization and the continuous development of industry, various pollutions caused by human factors are also increasing. Heavy metals, radioactive materials discharged from factories, and leachate from landfills constantly threaten the vadose zone soil and groundwater. The vadose zone is the area below the surface above the water table. Pollution of vadose zone soil and groundwater is referred to as "invisible pollution". At present, the pollution of soil and groundwater in my country is becoming more and more serious, and the soil and groundwater in the vadose zone are polluted to varying degrees, which poses a serious threat to the ecological environment, food safety and sustainable agricultural develop...

AI Technical Summary

Problems solved by technology

[0003] After more than ten years of global research and application, a contaminated soil remediation technology system including biological remediation, physical remediation, chemical remediation and their combined remediation technologies has been formed, but there are still many problems, such as high cost, engineering Difficult application, serious secondary pollution, etc.

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