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Organic pollution soil restoration method

A soil remediation and organic pollution technology, applied in the field of contaminated soil remediation, can solve problems such as unsatisfactory treatment effects, achieve the effect of reducing the amount of use and improving the treatment effect

Inactive Publication Date: 2016-10-26
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, physical, chemical and biological remediation technologies are mainly used at home and abroad for soil remediation of contaminated sites. Due to the limitations of these remediation technologies, the treatment effect is not very satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for remediating organic polluted soil, comprising the steps of:

[0020] (1) Put the soil to be treated into a crusher for crushing and then sieve; the particle size of the sieved soil to be repaired is less than 20mm;

[0021] (2) The crushed and screened soil is preheated by a heat exchanger and subjected to thermal desorption treatment. The thermal desorption is carried out in a horizontal rotary kiln, and the temperature of the thermal desorption is controlled at 450°C; the time for the thermal desorption is The time is 45 minutes; the gas generated by thermal desorption is sent to the combustion chamber and incinerated at 1000°C. The flue gas generated after incineration is discharged after waste heat recovery, acid removal, and dust removal. The heat recovered from the incineration flue gas is used To preheat the crushed and screened soil;

[0022] (3) After cooling the soil after thermal desorption to room temperature, add water to make the moisture con...

Embodiment 2

[0026] A method for remediating organic polluted soil, comprising the steps of:

[0027] (1) Put the soil to be treated into a crusher for crushing and then sieve; the particle size of the sieved soil to be repaired is less than 20mm;

[0028] (2) The crushed and sieved soil is preheated by a heat exchanger and then subjected to thermal desorption treatment. The thermal desorption is carried out in a horizontal rotary kiln, and the temperature of the thermal desorption is controlled at 550°C; the time for thermal desorption is The time is 30 minutes; the gas generated by thermal desorption is sent to the combustion chamber and incinerated at 1200 ° C. The flue gas generated after incineration is discharged after waste heat recovery, acid removal, and dust removal. The heat recovered from the incineration flue gas is used To preheat the crushed and screened soil;

[0029] (3) After cooling the soil after thermal desorption to room temperature, add water to make the moisture co...

Embodiment 3

[0033] A method for remediating organic polluted soil, comprising the steps of:

[0034] (1) Put the soil to be treated into a crusher for crushing and then sieve; the particle size of the sieved soil to be repaired is less than 20mm;

[0035] (2) The crushed and screened soil is preheated by a heat exchanger and subjected to thermal desorption treatment. The thermal desorption is carried out in a horizontal rotary kiln, and the temperature of the thermal desorption is controlled at 500°C; the time for the thermal desorption is The time is 40 minutes; the gas generated by thermal desorption is sent to the combustion chamber and incinerated at 1100°C. The flue gas generated after incineration is discharged after waste heat recovery, acid removal, and dust removal. The heat recovered from the incineration flue gas is used To preheat the crushed and screened soil;

[0036] (3) After cooling the soil after thermal desorption to room temperature, add water to make the moisture con...

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Abstract

The invention provides an organic pollution soil restoration method which comprises the following steps: (1)putting to-be-treated soil in a crusher for crushing and then sieving the soil; (2) preheating the crushed and sieved soil in a heat exchanger, and then carrying out thermal desorption on the soil, wherein the temperature of the thermal desorption is controlled to be 450-550 DEG C; (3) cooling the soil to the room temperature, adding water in the soil to enable the water content of the soil to be 10-20%; (4) adding aqueous surfactant solution in the soil obtained in the step (3), uniformly stirring the soil, and conserving the soil for 3-5 days in a sealing manner; and (5) adding an oxidizing agent in the soil obtained in the step (4), uniformly stirring the soil, and conserving the soil for 3-5 days in a sealing manner, wherein the oxidizing agent is a mixture of hydrogen peroxide, sodium persulfate, ferrous sulfate and citric acid. According to the invention, the thermal desorption method and the chemical oxidation method are combined to improve the treatment effect.

Description

technical field [0001] The invention belongs to the field of remediation of polluted soil, and in particular relates to a method for remediation of organic polluted soil. Background technique [0002] With the rapid development of modern industry, the problem of soil pollution of refractory organic matter is becoming more and more serious, which not only affects the environmental quality of soil, but also may affect human health through various channels. my country's current organic site pollution is mainly non-chlorinated organic pollutants such as petroleum hydrocarbons, organic pesticides, and persistent organic pollutants. [0003] Existing contaminated soil remediation technologies mainly include physical methods, chemical methods and biological methods, among which chemical leaching method, electrokinetic method, thermal desorption method and biological method have been studied more. The chemical washing method is easy to operate, but it has strict requirements on the...

Claims

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Application Information

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IPC IPC(8): B09C1/06B09C1/08F23G7/06
CPCB09C1/06B09C1/08F23G7/06F23G2209/14
Inventor 马军军韩正昌申屠灵女谢文玉韩峰朱家明高亚娟陶志慧张寅丞朱伯淞何建龙季军吴传宝张寿兵
Owner NANJING GW ENVIRONMENT ENG
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