Electric-chemical combined remediation system and method for organic matter polluted soil

Abstract

The invention provides an electric-chemical combined remediation system and method for organic matter polluted soil. The method comprises the following steps: determining positions and quantity of high-pressure rotary spraying points according to related parameters of an organic matter polluted soil region; after drilling a hole to a pre-set depth by utilizing a drilling machine, injecting high-pressure air and a mixed medicament into an external spraying pipe and an inner spraying pipe respectively; uniformly injecting the high-pressure air and the mixed medicament into the soil; while carrying out rotary spraying and injecting, continuously lifting the drilling machine at a uniform speed until a spraying nozzle is lifted to a pollution-free soil region, and stopping the rotary spraying;then moving the spraying nozzle to the next high-pressure rotary spraying point in the region and repeating the process; planning positions of an anode well and a cathode well and a distance between the two wells at the periphery of the region; then drilling a well hole adaptive to the size and depth of a well pipe; then putting the well pipe and uniformly filling filtering materials at the periphery of the well pipe; putting an anode plate and a cathode plate into the anode well and the cathode well respectively; then injecting an anode buffering solution and a cathode buffering solution respectively; switching on a power supply and adjusting the strength of an electric field to carry out reinforced remediation.

Description

Technical field [0001] The invention relates to an electrodynamic-chemical combined remediation system and method for soil contaminated by organic matter, and belongs to the technical field of soil remediation. Background technique [0002] Soil organic pollution in my country has the characteristics of regionality, concealment, accumulation, irreversibility, and long treatment cycle. Soil treatment technologies, such as thermal analysis, steam extraction, leaching, chemical oxidation, etc., are often only suitable for permeable soils. When dealing with clayey soils, the treatment effect is poor, the cycle is long, and it is difficult to reach the standard for a single remediation. Electrokinetic (EK) repair technology is a technology developed specifically for clayey soils. Electrokinetics technology is to apply a direct current electric field on both sides of the contaminated soil, and the pollutants in the soil migrate out of the system under the combined action of electromig...

AI Technical Summary

Problems solved by technology

The electrokinetic-chemical combined restoration system and method of the organic-contaminated soil provided by the present invention can solve the problem of deep and large area of ​​the polluted site (especially for depth exceeding 3m) , a large area of ​​contaminated sites), the soil permeability coefficient is small, the penetration of chemicals is slow, the contact between pollutants and chemicals is insufficient, and the effective time of chemicals is short, which leads to long repair period, large investment and low repair efficiency.

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