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Microwave catalytic remediation method for organic matter-heavy metal compound contaminated soil

A remediation method and composite pollution technology, applied in the field of soil treatment, can solve the problems of low microwave utilization efficiency, difficulty in catalytic degradation of organic pollutants and stabilization of heavy metals, etc., to achieve easy operation and quality control, treatment of heavy metal pollution, and large specific surface area Effect

Active Publication Date: 2016-11-16
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for remediating organic-heavy metal compound polluted soil, the purpose of which is to solve the problem of low microwave utilization efficiency and difficulty in catalytically degrading organic pollution in the existing microwave remediation soil method problems with substances and stabilized heavy metals

Method used

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  • Microwave catalytic remediation method for organic matter-heavy metal compound contaminated soil
  • Microwave catalytic remediation method for organic matter-heavy metal compound contaminated soil
  • Microwave catalytic remediation method for organic matter-heavy metal compound contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Soil source: For organic matter and heavy metal pollutants, the self-prepared composite polluted soil was used as the research object to carry out microwave-induced catalytic remediation of polluted soil, in which the organic pollutant was nitrophenol and the heavy metal was Cd. The soil quality of the simulated soil is sandy loam, and the concentrations of nitrophenol and Cd in the simulated polluted soil are 500mgkg -1 , 10mgkg -1 , the soil moisture content is 9%.

[0037] (2) Preparation of microwave catalyst: Dissolve magnesium nitrate and ferric nitrate with a molar ratio of 1:2 in deionized water, add NaOH solution dropwise to the beaker, and magnetically stir at the same time until the pH is 11, continue magnetic stirring 1h. Then put it in a household microwave oven with a microwave power of 230W and a frequency of 1000MHZ, irradiate for 10min, continue magnetic stirring for 2h, separate the precipitate by suction filtration, wash with deionized water for 3...

Embodiment 2

[0041] (1) Soil source: For organic and heavy metal pollutants, self-prepared composite contaminated soil was used as the research object to carry out microwave-induced catalytic remediation of polluted soil, in which the organic pollutant was hexachlorobenzene and the heavy metal was Pb. The soil quality of the simulated soil is sandy loam, and the concentration of hexachlorobenzene and Pb in the simulated polluted soil is 500mgkg respectively -1 , 10mgkg -1 , the soil moisture content is 11%.

[0042] (2) Preparation of microwave catalyst: Dissolve magnesium nitrate and ferric nitrate with a molar ratio of 3:5 in deionized water, and add NH 3 ·H 2 O solution, magnetic stirring was performed at the same time until the pH was 8, and magnetic stirring was continued for 1 h. Then put it in a household microwave oven with a microwave power of 200W and a frequency of 900MHZ, irradiate for 30min, continue magnetic stirring for 2h, separate the precipitate by suction filtration, ...

Embodiment 3

[0046] (1) Soil source: For organic matter and heavy metal pollutants, self-prepared composite contaminated soil was used as the research object to carry out microwave-induced catalytic remediation of polluted soil, in which organic pollutants were polychlorinated biphenyls and heavy metals were chromium. The soil quality of the simulated soil is sandy loam, and the concentrations of PCB and chromium in the simulated polluted soil are 500mgkg respectively -1 , 10mgkg -1 , the soil moisture content is 12%.

[0047] (2) Preparation of microwave catalyst: Dissolve magnesium nitrate and ferric nitrate with a molar ratio of 2:1 in deionized water, and add NH 3 ·H 2 O solution, magnetic stirring was performed at the same time until the pH was 13, and magnetic stirring was continued for 1 h. Then put it in a household microwave oven with a microwave power of 700W and a frequency of 3000MHZ, irradiate for 2min, continue magnetic stirring for 2h, separate the precipitate by suction ...

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Abstract

The invention belongs to the technical field relevant to soil remediation and particularly relates to a microwave catalytic remediation method for organic matter-heavy metal compound contaminated soil. The microwave catalytic remediation method for the organic matter-heavy metal compound contaminated soil comprises the steps that magnesium salt, ferric salt and aqueous alkali are added into deionized water and then mixed and stirred; turbid liquid is irradiated in a microwave oven; suction filtration is conducted on the turbid liquid after a reaction so that sediment can be separated out, and the sediment is washed and dried; a microwave catalyst is obtained through cooling and grinding after calcination; the microwave catalyst and the contaminated soil are mixed; the mixture is placed in a microwave reactor, and oxygen or air is led into the microwave reactor for a microwave reaction; and gas generated during the reaction is collected at the same time, and thus required remediation of the contaminated soil is completed. By the adoption of the microwave catalytic remediation method for the organic matter-heavy metal compound contaminated soil, the contaminated soil can be remediated in the way that environment protection is facilitated, quality control is convenient and the efficiency is high; and the microwave catalyst is used for adsorbing heavy metal ions in the contaminated soil and degrading organic matter in the contaminated soil, and meanwhile secondary pollution is avoided by collecting waste gas.

Description

technical field [0001] The invention belongs to the technical field related to soil treatment, and more specifically relates to a microwave catalytic repair method for organic matter-heavy metal compound polluted soil. Background technique [0002] In recent years, with the adjustment of my country's industrial layout and the relocation of urban construction enterprises, a large number of industrial sites such as chemical plants, electroplating, metal smelting plants, and steel plants have been abandoned, relocated, or used for commercial development, leaving behind a large number of high-concentration organic compounds and Heavily polluted sites with heavy metals. According to the "National Pollution Survey Bulletin" published by my country in 2014, as many as 34.9% of the surveyed industrial wastelands were polluted by heavy metals and organic substances exceeding the standard. Compared with air and water pollution, soil pollution is the result of three-phase interaction, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 陈静王琳玲李鸿博任立明叶勇明晓贺呼红霞王棣潘红
Owner HUAZHONG UNIV OF SCI & TECH
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