In-situ chemical oxidation remediation system and method for organic contaminated soil and application

Abstract

The invention belongs to the technical field of soil remediation, and discloses an organic contaminated soil in-situ chemical oxidation remediation system and method and application, water injection wells are arranged in the organic contaminated soil in-situ chemical oxidation remediation system and located in a soil contaminated area, and a drainage well is surrounded by a plurality of water injection wells and located in the centers of the water injection wells; a water injection well screen pipe is mounted in the water injection well, and a discharge plasma generator is fixed in the water injection well screen pipe; the water injection well screen pipe is connected with a water injection pump through a connecting pipeline, and the bottom of the drainage well is provided with a drainage pump. The discharge plasma generator is connected with a gas supply system and a high-voltage power supply through a gas conveying pipeline and a high-voltage wire. Active species generated by the discharge plasma generator are used for repairing the organic contaminated soil, and the method has the advantages of being low in repairing cost, short in repairing time, good in effect, small in disturbance to the environment, free of secondary pollution, capable of being suitable for combined contaminated sites with different contaminated mass quantities and the like.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to an in-situ chemical oxidation remediation system, method and application of organic polluted soil. Background technique [0002] At present, with the acceleration of my country's urbanization process and the adjustment of industrial structure, some petroleum, chemical, coking and other enterprises have closed down and relocated successively due to serious pollution to the surrounding soil environment, resulting in a large number of polluted sites. When these polluted sites undergo functional conversion or secondary development and utilization, the high-risk organic pollutants in the soil pose a serious threat to human health and environmental safety. How to reduce or even remove organic pollutants in the soil has become an urgent soil environmental problem to be solved. [0003] The remediation of organic contaminated soil usually adopts two remediation opera...

AI Technical Summary

Problems solved by technology

[0006] (1) The process equipment is complicated and the conditions are harsh;

[0007] (2) The demand for oxidants is large, and secondary pollution will also occur;

[0008] (3) The continuity and stability of soil remediation are not strong

[0009] The difficulty and significance of solving the above problems and defects are as follows: With the increasingly stringent standards for the remediation of organic polluted soil, in order to achieve the remediation goal, the process equipment for in situ chemical oxidation of Fenton reagent and activated persulfate to remediate organic polluted soil is becoming more and more complex , the conditions are becoming more and more harsh; at the same time, the Fenton reaction and the process of activating persulfate are affected by many factors. In the complex system of polluted soil, it is difficult to continuously and stably produce strong persulfate in polluted soil by controlling the reaction conditions of the device. Oxidative free radicals; In addition, there is currently no way to avoid secondary pollution caused by Fenton's reagent and persulfate

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