Process for efficiently repairing organic contaminated soil

Abstract

The invention discloses a technology for efficiently repairing organic contaminated soil. The method comprises the following steps that 1, oxidation chemical injection is conducted on a contaminated site through Geoprobe; 2, when the polluted site belongs to moderate pollution, the polluted site is heated through a heating well after the step 1, the heating temperature of the polluted soil is 40-80 DEG C, and the heating time is 3-10 days; and 3, when the polluted site is seriously polluted, the polluted site is continuously heated after the step 2, the heating temperature of the polluted soil is 200-400 DEG C, and the heating time is 20-40 days. According to the process, chemical oxidation and in-situ thermal desorption are combined, sites with different pollution degrees can be repaired, excavation is not needed, disturbance to the sites is small, secondary pollution is small, operation is easy, and the process is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of environmental remediation, and relates to a process for efficiently remediating organic polluted soil. Background technique [0002] At present, most of the technologies used in organic polluted sites are chemical oxidation, thermal desorption, and cement kiln co-processing. Chemical oxidation technology mostly uses catalytic persulfate and Fenton reagent to degrade pollutants. The catalytic methods include thermal catalysis, iron ion catalysis, alkali catalysis, etc. This repair technology is relatively mature and widely used in engineering, but it is aimed at The amount of oxidant injected into the site is too large, and the oxidation method is not effective in degrading polycyclic aromatic hydrocarbon pollutants. The cement kiln co-processing technology has a large amount of disposal and low cost. Even the refractory organic waste can be efficiently removed in the cement kiln, but it needs to have an ...

AI Technical Summary

Problems solved by technology

Chemical oxidation technology mostly uses catalytic persulfate and Fenton reagent to degrade pollutants. The catalytic methods include thermal catalysis, iron ion catalysis, alkali catalysis, etc. This repair technology is relatively mature and widely used in engineering, but it is aimed at The amount of oxidizing agents injected into the site is too large, and the simultaneous oxidation method is not effective in degrading polycyclic aromatic hydrocarbon pollutants.

The cement kiln co-processing technology has a large amount of disposal and low cost. Even the refractory organic waste can be efficiently removed in the cement kiln, but it needs to have an acceptable cement kiln disposal center around the repair site; thermal desorption technology can treat Most of the organic matter, pollutants are completely removed, but it has the disadvantages of high cost and high energy consumption

[0003] In addition, contaminated sites are often complex, and most of the same contaminated sites have different levels of pollution, requiring different remediation technologies

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