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Method for treating organic matter-contaminated soil by using supercritical water oxidation technology

A supercritical water oxidation and polluted soil technology, applied in the restoration of polluted soil, etc., can solve the problems of long treatment period, low purification efficiency, secondary pollution, etc., and achieve short treatment period, high treatment efficiency and low energy consumption low effect

Inactive Publication Date: 2015-06-17
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of low purification efficiency, secondary pollution, and long treatment cycle in the existing organic matter-contaminated soil treatment technology, the present invention discloses a method for treating organic matter-contaminated soil by using supercritical water oxidation technology. Various organic pollutants Under supercritical water oxidation conditions, non-toxic inorganic substances are finally generated, which can be directly discharged into the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Treatment of PAH-contaminated soil.

[0042] The content of polycyclic aromatic hydrocarbons (16 priority polycyclic aromatic hydrocarbons specified in US EPA610) in the soil to be treated was 1216ug / kg (dry soil). According to the above purification steps, the oxide is hydrogen peroxide (H 2 o 2 Concentration is 30%), reaction temperature is set as 410 ℃, pressure 25~30MPa, after 1 minute of treatment, the content of 16 kinds of priority control polycyclic aromatic hydrocarbon compounds in the remediation soil is 202ug / kg, and removal rate is 83.4%. Prolonging the reaction time for 5 minutes, the removal rate of pollutants increased to 93.69%.

Embodiment 2

[0044] Treatment of soil contaminated by explosives such as TNT, RDX, and HMX.

[0045] The content of TNT, RDX, HMX and other propellant pollutants in a certain pollution to be treated is 1866ug / kg (dry soil). According to the above purification steps, the oxide is hydrogen peroxide (H 2 o 2 Concentration is 30%), reaction temperature is set as 450 ℃, pressure 25~32MPa, after treating for 1 minute, the propellant pollutant content such as TNT, RDX, HMX in the remediation soil is 137ug / kg, and removal rate is 92.66%. Increasing the reaction temperature to 550°C, the removal rate of pollutants increased to 98.82%.

Embodiment 3

[0047] organic compound polluted soil

[0048] After the relocation of a chemical factory, the soil in the abandoned land was taken as the polluted soil to be treated, and the soil was polluted by multiple pollutants. The soil was added with water to make mud (water content 80%), and 21 kinds of organic pollutants were detected, of which phenol and chlorobenzene accounted for 32.1% of the pollutants, and polycyclic aromatic hydrocarbons accounted for 57.0% of the emissions. According to the above purification steps, the oxide is hydrogen peroxide (H 2 o 2 The concentration is 30%), the reaction temperature is set at 450° C., and the pressure is 25-30 MPa. After 1 minute of treatment, the total removal rate of various pollutants in the soil reaches 86.2%. Increase the reaction temperature to 580°C and the pressure to 32MPa. After 5 minutes of treatment, the total removal rate of various pollutants in the soil can reach 99%.

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Abstract

The invention discloses a method for treating organic matter-contaminated soil by using supercritical water oxidation technology. The method comprises the following steps: crushing organic matter-contaminated soil in a crushing apparatus and carrying out screening; fully mixing screened and filtered fine soil with water in a slurry preparation apparatus with stirring so as to prepare slurry; heating the prepared slurry with a preheating apparatus; then delivering the heated slurry to a supercritical water oxidation reactor and introducing an oxidizing agent through a pressure pump; and allowing reacted slurry to enter into a low pressure reactor through a heat storage apparatus and then into a separator and subjecting clean slurry to press filtration dehydration and drying so as to obtain clean soil. The method provided by the invention has a wide range of application and is applicable to almost all the soil contaminated by organic matters, especially to treatment of hardly degradable and persistent organic pollutants and treatment of soil having complex components and combindly contaminated by a plurality of organic matter pollutants; and the method has the advantages of high treatment efficiency, short treatment time and no secondary pollution.

Description

technical field [0001] The invention belongs to the field of soil pollution treatment in environmental protection technology, and relates to a process and method for treating organic-contaminated soil by supercritical water oxidation technology, especially the field where the organic components of polluted soil are complex and difficult to be effectively purified by other methods. Background technique [0002] Soil is an indispensable and important substance for life activities on the earth. It is the most important basis for maintaining the cycle of carbon, nitrogen, sulfur, phosphorus and other substances in the earth's ecosystem. It is also one of the main natural resources that human beings rely on for survival and the most important resource for economic and agricultural development. . However, with the aggravation of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals such as pesticides and fertilizers, soil pollution i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 赵光明李娜秦盛东刘玉存柴涛李斌
Owner ZHONGBEI UNIV