Method for remediation of contaminated soil and groundwater

Abstract

The invention relates to the technical field of soil remediation, in particular to a method for remediating polluted soil and groundwater. The method comprises: 1) constructing an injection well upstream of the groundwater in the polluted area, and constructing a discontinuous reaction wall downstream of the groundwater in the polluted area, wherein the pollutants in the polluted area include volatile and / or semi-volatile organic compounds ; 2) Inject biosurfactant slurry into the injection well, so that the biosurfactant migrates to the polluted area under the action of groundwater to contact the pollutants therein, and the obtained oil-water mixture flows to the discontinuous reaction wall, Under the barrier of the impermeable wall area, enter the permeable reaction area for reaction. The method of the invention can effectively remove volatile and semi-volatile organic compounds in polluted soil and groundwater, and is also particularly suitable for repairing sites where excavation, extraction and injection operations cannot be performed above the polluted area.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating polluted soil and groundwater. Background technique [0002] The soil environment is one of the basic elements of the ecosystem, and the basis for the survival and development of human beings and organisms. With the development of my country's industrialization process, environmental pollution accidents and human health damage incidents occur from time to time. At present, volatile and semi-volatile organic pollutants have become the most common and prominent types of pollutants in the soil of industrial sites. Especially sudden environmental pollution accidents, such as oil storage tank leaks, oil pipeline ruptures, gasoline and diesel spills, etc. will cause varying degrees of pollution to soil and groundwater, and further bring greater harm to human health in the site. harm. [0003] The remediation methods for volatile and semi-volatile or...

AI Technical Summary

Problems solved by technology

CN103447291B discloses a method for strengthening gas-phase extraction and restoration of chlorobenzene-contaminated soil. The method includes adopting a plurality of heating extractors, condensing units, gas-liquid separators and vacuum pumps arranged in an equilateral triangle or a square, etc., in a short period of time. The remediation effect of chlorobenzene-contaminated soil is obvious, and the pollutant removal rate is high, but the effect is easily affected by soil properties, etc. (for example, high soil viscosity, poor heat transfer effect)

CN102513347A discloses a method for treating polluted soil with in-situ thermal intensification combined with soil gas phase extraction technology. The method forms a certain form of heating well in the polluted area, deploys heater components in the heating well, and installs casings. The medium is filled with a catalyst to accelerate the pyrolysis of pollutants into simple small molecular substances; this method has a good treatment effect on pollutants, but the cost of the extraction device is high and it is difficult to popularize

In addition, since volatile and semi-volatile organic compounds are often difficult to dissolve in water and migrate slowly with groundwater, using PRB or extraction treatment technology directly downstream of the polluted area is not only time-consuming and labor-intensive, but also cannot fundamentally solve the pollution problem in the polluted area

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