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An electrodynamically driven and electrothermally activated oxidation/reduction repair method

A remediation method and electric-driven technology, applied in the field of soil pollution treatment, can solve problems such as limited application fields and inability to achieve thermal activation.

Active Publication Date: 2021-11-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermal activation cannot be realized in contaminated sites, which limits its application fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The specific repair steps are as follows:

[0034] 1) Pump the sodium persulfate solution in the chemical tank into the injection well 1 meter deep into the soil to be repaired through the pipeline;

[0035] 2) Insert the cathode and anode connected to the power supply (using the electrode system of the patent CN106881346A) into the soil to be treated, electrify to form an electric field, and drive persulfate radicals to transmit in the soil through electricity;

[0036] 3) Through power regulation, heating will be realized. The specific power regulation method is as follows:

[0037] Inject the electrolyte into the electrode system, the electrolyte is a mixture of sodium persulfate and sodium chloride, the concentration of both is 1.0mol / L, and the electrolyte circulation system is used to continuously update;

[0038] Turn on the power, and gradually adjust the voltage gradient between the two electrodes from 0V / cm to 1.5V / cm;

[0039] Monitor the soil temperature c...

Embodiment 2

[0044] The specific repair steps are as follows:

[0045] 1) Pump the sodium persulfate solution in the chemical tank into the injection well 1 meter deep into the soil to be repaired through the pipeline;

[0046] 2) Insert the cathode and anode connected to the power supply into the soil to be treated respectively, energize to form an electric field, and drive the oxidation / reduction agent to achieve transmission in the soil;

[0047] 3) Realize heating and temperature rise through power regulation. The specific power regulation method is as follows:

[0048] Inject the electrolyte into the electrode system, the electrolyte is a mixture of 1.0mol / L sodium persulfate, 2.0mol / L sodium chloride and 0.25% Tween80, and use the electrolyte circulation system to continuously update;

[0049] Turn on the power, and gradually adjust the voltage gradient between the two electrodes from 0V / cm to 2V / cm;

[0050] Monitor the soil temperature change between the two electrodes. After 1.5...

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PUM

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Abstract

The invention discloses an electrodynamically driven and electrothermally activated oxidation / reduction restoration method, which comprises the following steps: injecting an oxidation / reduction agent into the soil to be treated; inserting a cathode and an anode connected to a power supply into the soil to be treated, and electrifying to form an electric field , to realize the transmission of oxidation / reduction agents in the soil through electric drive; through electrothermal activation, the heating and temperature rise can be realized, and the oxidation agents can be activated after the temperature rises to realize soil remediation; the electrothermal activation refers to the addition of strong electrolytes to the soil to be treated . The invention utilizes the heat generated by the electrokinetic process to activate the oxidizing agent by means of regulation and control, which can significantly improve the oxidation capacity and repair efficiency without introducing other exogenous substances. The in-situ mass transfer ability of the oxidation method kills three birds with one stone, is efficient and practical, and has strong engineering operability. It is an efficient restoration technology with great application prospects.

Description

technical field [0001] The invention relates to the technical field of soil pollution treatment, in particular to an electrodynamically driven and electrothermally activated oxidation / reduction restoration method. Background technique [0002] Chemical oxidation / reduction is the most commonly used method for remediating organically contaminated soils. In-situ chemical oxidation / reduction is to inject oxidation / reduction agents into the underground environment to convert toxic and harmful pollutants into non-toxic, harmless or low-toxicity and stable substances. The main advantage of this method is that the advanced oxidation reaction mainly based on free radical reaction can degrade organic matter almost non-selectively, and as long as the conditions are suitable, organic matter can be completely mineralized into CO 2 、H 2 O and inorganic ions are a relatively thorough restoration technology. However, the remediation effect of this technology in cohesive soil is greatly r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 付融冰温东东郭小品刘华秋
Owner TONGJI UNIV