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Electro-dynamic driving and electro-thermal activating oxidation/reduction restoration method

A technology of electric drive and remediation method, applied in the field of soil pollution treatment, can solve the problems of limited application field, unrealizable thermal activation, etc., achieves good technical significance, enhances in-situ mass transfer ability, and avoids the effect of difficult application.

Active Publication Date: 2019-06-07
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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Abstract

The invention discloses an electro-dynamic driving and electro-thermal activating oxidation / reduction restoration method. The method comprises the following steps: injecting an oxidation / reduction agent into soil to be treated; respectively inserting a cathode and an anode, which are connected with a power supply, into the soil to be treated, electrifying the electrodes to form an electric field,and electrically driving the oxidation / reduction agent to be transmitted in the soil; performing electric heating activation for heating the agents, so that an oxidizing agent can be activated after the temperature rises, and soil restoration is achieved. The electric heating activation is to add a strong electrolyte into the soil to be treated. Heat generated in the electric process is used for activating the oxidizing agent through a regulation and control means, the oxidizing capacity and the repairing efficiency can be remarkably improved, and other exogenous substances are not introduced.The method is simple and easy to operate, practical application of the electro-dynamic restoration technology is achieved, the in-situ mass transfer capacity of the chemical oxidation method is enhanced, three purposes are achieved at the same time, and the method is efficient, practical and high in engineering operability and is an efficient remediation 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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IPC IPC(8): B09C1/08
Inventor 付融冰温东东郭小品刘华秋
Owner TONGJI UNIV
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