Combined remediation system and remediation method for organic pollution site

Abstract

The invention discloses a combined remediation system and remediation method for an organic contaminated site, and belongs to the technical field of contaminated soil remediation. The combined remediation system comprises a circle of vertical barrier wall arranged along the boundary of organic contaminated soil in a surrounding mode; a dewatering well, a heating well, a temperature detection well and a sand guiding and discharging well are drilled; a permeable reaction layer, a guiding and discharging layer and a blocking layer are laid on the surface of the organic contaminated soil; starting a water pumping device to pump out underground water in the organic contaminated soil; and after water pumping is completed, the heating device is started to heat and repair the organic contaminated soil. By additionally arranging the sand guiding and discharging well and the permeable reaction layer, organic pollutants are degraded through efficient chemical reaction by fully utilizing waste heat of waste gas, and the problems that gaseous pollutants are easily cooled and enriched on the surface layer, the waste gas treatment load is large, and high-concentration polluted waste gas is difficult to reach the standard in an existing in-situ thermal desorption process are solved; and efficient, safe and civilized treatment and restoration of the organic pollution site reach the standard.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a combined remediation system and a remediation method for organic polluted sites. Background technique [0002] With the global production of synthetic chemicals increasing year by year, the global soil organic pollution is becoming more and more serious. The main types of soil organic pollutants in my country include: petroleum hydrocarbon pollutants, halogenated hydrocarbon pollutants, pesticide pollutants, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, dioxins, phthalates, etc. The National Soil Pollution Survey Bulletin (2014) shows that the overall soil environment is not optimistic. Some areas have serious soil pollution. The over-standard rates of three types of organic pollutants of ring aromatic hydrocarbons were 0.5%, 1.9%, and 1.4%, respectively. Because soil organic pollutants are highly toxic and can spread widely, t...

AI Technical Summary

Problems solved by technology

Setting up installation tunnels for in-situ horizontal drilling to install heating pipes and extraction pipes makes it difficult to achieve a dense filling of filter materials around the extraction pipes, resulting in low exhaust gas extraction efficiency, and does not solve the problem of the existing TCH in-situ thermal desorption technology. The waste gas treatment load is large, High-concentration polluted exhaust gas is difficult to meet the standards and other difficulties

[0007] A distributed in-situ thermal desorption waste gas treatment method (CN112569780A), a self-sustaining oxidation extraction system and method for in-situ thermal desorption waste gas in the field of soil remediation (CN112496018A), using distributed in-situ waste gas treatment method, there are problems such as high investment in in-situ waste gas treatment equipment, complicated daily operation and maintenance, and the difficulty that the existing TCH in-situ thermal desorption process waste gas is easy to enrich on the surface has not been solved

Images