A method for preventing the focusing phenomenon of electrokinetic restoration of soil and groundwater

Abstract

The present invention proposes a set of methods for preventing the occurrence of the focusing phenomenon based on the trapping effect of the ion-induced voltage trap that leads to the focusing phenomenon during the electric restoration process of the polluted soil and groundwater, including 2 types and 5 methods in total. The first type of method is to prevent the occurrence of focusing phenomenon in the electrokinetic restoration process through a reasonable layout of the electrodes. There are three methods, namely: (1) make the direction of the electric field perpendicular to the direction of the soil conductivity gradient; (2) place the high conductivity area Upstream of the migration direction of the target ions; (3) Restoring the site according to the difference in soil conductance. The second type of method is to prevent the occurrence of focusing phenomenon in the soil near the electrode by reasonably controlling the concentration of the electrode working solution. There are two methods, namely: (1) use low concentration electrode working solution; (2) use clean surface water , drinking water or local groundwater to dissolve the electrolyte in the soil around the electrode pool to make electrode working solution. The above methods can be used in combination according to the site conditions.

Description

technical field [0001] The invention relates to a method how to prevent or weaken the occurrence of focusing phenomenon in the electric restoration process of polluted soil and groundwater. Background technique [0002] When the waste water and solid waste generated in the industrial production process enter the soil, it will lead to soil and groundwater pollution. When the site is converted into residential, agricultural and other land, the soil and groundwater must be restored to eliminate the pollutants. [0003] The main methods of soil and groundwater restoration are: (1) physical restoration: physical separation restoration, solidification / stabilization restoration, steam extraction restoration, electric restoration, etc.; (2) chemical restoration: chemical leaching restoration, solvent extraction restoration, High-temperature incineration restoration, redox restoration, etc.; (3) Bioremediation: prepared bed method, soil composting method, mud bioreactor method, land ...

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Problems solved by technology

However, if the electrolyte concentration is high, the amount of electrolyte that diffuses into the soil in the electrode area from the electrode working solution 6 will be greater than the amount that diffuses into the electrode working solution 6 from the soil in the electrode area, so that the conductivity of the soil near the electrode will increase, forming a high conductivity area 3

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