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In-situ soil remediation system and remediation method based on gas thermal desorption

A technology of soil remediation and thermal desorption, which is applied in the in-situ soil remediation system based on gas thermal desorption and the field of remediation, which can solve the problems of high energy consumption, inability to achieve thermal desorption of organic matter, long repair period, etc.

Pending Publication Date: 2020-10-27
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the remediation system simplifies the equipment, it also heats the soil to a higher temperature, the remediation period is long, and the energy consumption is relatively high. In addition, for some organic pollutants with high boiling points, the heating temperature below 100°C cannot achieve these. Thermal Desorption of Organic Matter

Method used

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  • In-situ soil remediation system and remediation method based on gas thermal desorption
  • In-situ soil remediation system and remediation method based on gas thermal desorption
  • In-situ soil remediation system and remediation method based on gas thermal desorption

Examples

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Effect test

Embodiment 1

[0073] This embodiment provides a method for in-situ remediation of polluted soil, the processed polluted soil heavy metals include the highest content of total chromium, total manganese, total cadmium and total lead respectively 526mg / kg, 348mg / kg and 280mg / kg kg and 460mg / kg, the highest content of volatile organic compound halogenated hydrocarbons is 73mg / kg, and the contaminated soil area containing the above-mentioned pollutants is repaired in situ, and the soil restoration method described includes the following steps:

[0074] (1) Fully infiltrate the polluted soil, pass gas and air into the combustion device 8 through the gas pipe and the air pipe respectively, the volume ratio of gas and air feeding is 1:4, after the gas is mixed with air in the combustion device 8 The hot air generated by ignition passes through the inner pipe 10 from top to bottom, deflects from the bottom of the inner pipe 10 and enters the outer pipe 9, flows through the outer pipe 9 from top to bo...

Embodiment 2

[0080] This embodiment provides a method for in-situ remediation of polluted soil, the processed polluted soil heavy metals include the highest content of total chromium, total manganese, total cadmium and total lead respectively 493mg / kg, 362mg / kg and 269mg / kg kg and 475mg / kg, the highest content of volatile organic compound halogenated hydrocarbons is 75mg / kg, and the contaminated soil area containing the above pollutants is repaired in situ, and the soil restoration method includes the following steps:

[0081] (1) Fully infiltrate the polluted soil, pass gas and air to the combustion device 8 through the gas pipe and the air pipe respectively, the volume ratio of gas and air feeding is 1:4.2, after the gas is mixed with air in the combustion device 8 The hot air generated by ignition passes through the inner pipe 10 from top to bottom, deflects from the bottom of the inner pipe 10 and enters the outer pipe 9, flows through the outer pipe 9 from top to bottom, and is dischar...

Embodiment 3

[0087] This embodiment provides a method for in-situ remediation of polluted soil, the processed polluted soil heavy metals include the highest content of total chromium, total manganese, total cadmium and total lead respectively 517mg / kg, 336mg / kg and 257mg / kg kg and 469mg / kg, the highest content of volatile organic compound halogenated hydrocarbons is 68mg / kg, and the contaminated soil area containing the above-mentioned pollutants is repaired in situ, and the soil restoration method described includes the following steps:

[0088] (1) Fully infiltrate the polluted soil, pass gas and air into the combustion device 8 through the gas pipe and the air pipe respectively, the volume ratio of gas and air feeding is 1:4.4, after the gas is mixed with air in the combustion device 8 The hot air generated by ignition passes through the inner pipe 10 from top to bottom, deflects from the bottom of the inner pipe 10 and enters the outer pipe 9, flows through the outer pipe 9 from top to ...

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Abstract

The invention provides an in-situ soil remediation system and method based on gas thermal desorption. The in-situ soil remediation system comprises a gas heating module, an electrochemical degradationmodule, a gas phase extraction module and an oxidizing agent injection module. The gas heating module comprises a heating well buried in the contaminated soil and a combustion device connected with the heating well; the electrochemical degradation module comprises an anode plate and a cathode plate which are buried in the polluted soil, and the anode plate and the cathode plate are respectively and externally connected with a positive electrode and a negative electrode of a power supply; the gas phase extraction module comprises an extraction pipe network buried in the contaminated soil and avacuum pump connected with the extraction pipe network; the oxidizing agent injection module comprises at least one spray pipe buried in the contaminated soil; and the spray pipe is externally connected with an oxidizing agent storage tank. An in-situ fuel gas thermal desorption technology is adopted, and a chemical oxidation method and an electrochemical method with physical action are combined,so that the aims of synergistically and efficiently removing various pollutants and repairing soil are fulfilled.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to an in-situ soil remediation system and a remediation method, in particular to an in-situ soil remediation system and a remediation method based on gas thermal desorption. Background technique [0002] At present, the commonly used technologies for soil remediation include excavation, landfill, stabilization and solidification, chemical leaching, chemical redox, cement kiln co-processing, thermal desorption, phytoremediation and microbial remediation, etc., but most of these technologies excavate pollutants It is easy to cause secondary pollution. However, plant and microbial remediation technology is faced with the problems of short remediation period and low remediation efficiency. Therefore, it is urgent to develop new technologies for soil remediation to solve these problems. [0003] Electrokinetic remediation technology is an in-situ soil remediation technology that...

Claims

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Application Information

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IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/06B09C1/085B09C2101/00
Inventor 钟璐杨颖欣胡静龄刘勇胡小吐薛学良
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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