Restoration method for organic contaminated soil

A technology of organic pollution and remediation method, applied in the field of soil remediation, can solve the problems of inconvenient storage and transportation, achieve the effect of solving inconvenient storage and transportation, no secondary pollution, and fast repair effect

Inactive Publication Date: 2013-03-06
WUHAN HUAXINYUAN ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But traditional Fenton and ZVI/H 2 o 2 The composition of Fenton-like can only produce good oxidation effect under acidic conditions
The pH of most soils is generally close to neutral, using traditional Fenton and ZVI/

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] For organic pollutants with good water solubility, the simulated contaminated kaolin prepared with 2,4-dichlorophenol (2,4-DCP) was used as the experimental object to conduct the oxidative degradation experiment of ZVI / EDTA / Air system. The pH of the simulated contaminated soil was 5.68, and the concentration of 2,4-DCP was 488 mg / kg. The mass ratio of ZVI and organic polluted soil in the reaction system was 1:4, and the ratio of organic polluted soil mass (g) to aminocarboxylic acid complexing agent solution volume (mL) was 1:40. Take 10g of polluted soil and 2.5g of zero-valent iron powder in 400mL of EDTA solution with a concentration of 2mmol / L, put it in a reaction vessel, stir the mud evenly with a magnetic stirrer, the rotation speed is 1000rpm, use an air pump to pump air and pass the flow rate The flow rate was adjusted to 1 L / min, and the reaction was started under the conditions of normal temperature and pressure (30 °C, 1 atm). The resul...

Example Embodiment

[0028] Embodiment 2:

[0029] For water-soluble 2,4-dichlorophenol (2,4-DCP) contaminated simulated kaolin, using different aminocarboxylic acid complexing agents (ethylenediaminedisuccinic acid, EDDS), the ZVI / EDDS / Air system was tested. Oxidative degradation experiments. The concentration of 2,4-DCP in the contaminated soil was 233 mg / kg. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:50, and the ratio of organic contaminated soil mass (g) to the volume of aminocarboxylic acid complexing agent solution (mL) was 1:5. 100g of simulated contaminated soil and 500ml of EDDS aqueous solution with a concentration of 0.01mmol / L were added to the mud reactor, and 2g of iron powder was added at the same time, and the air aeration rate was 1L / min. The reaction was started at normal temperature and pressure (30 °C, 1 atm). After 3 hours of reaction, the degradation rate of DCP in soil was 93.4%, and that of EDDS was 91.4%. After 3.5 hours of reaction...

Example Embodiment

[0030] Embodiment three:

[0031]For the hydrophobic organic polluted soil, the organic pesticide polluted soil collected from the former site of a pesticide factory in Wujiang City, Jiangsu Province, China was used as the experimental object. The soil is silty clay loam, pH 6.38, 0.85% organic matter, hexachloride, 4,4'-DDE, 2,4'-DDD, 4,4'-DDD, 4,4'- The concentrations of DDT and total DDT were 64.2 mg / kg, 4.58 mg / kg, 82.4 mg / kg, 295 mg / kg, 987 mg / kg and 1369 mg / kg, respectively. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:20, and the ratio of organic contaminated soil mass (g) to the volume of aminocarboxylic acid complexing agent solution (mL) was 1:8. 50g of contaminated soil and 400ml of aqueous solution were added to the slurry reactor. The concentration of EDTA in the aqueous solution was 0.2mmol / L. At the same time, 2.5g of iron powder was added. The slurry was stirred with a magnetic stirrer at a rotational speed of 800rpm. The f...

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Abstract

The invention belongs to the technical field of associated contained soil restoration of environment protection and relates to a novel restoration method for organic contaminated soil. The method comprises the following steps of: using an oxidation reaction system consisting of amino carboxylic acid substances (ethylene diamine tetraacetic acid (EDTA), ethylenediaminedisuccinic acid (EDDS), sodium triglycollamate(NTA) and the like), zero-valent iron (ZVI) and air (AIR) to complex dissolved oxygen through a series of reactions between amino carboxylic acid complexing agent and Fe<2+>; and finally, enabling O-O bond to brake and activate for in-situ generating H2O2, reacting the generated H2O2 with Fenton formed by Fe<2+> to quickly degrade organic pollutant in the soil, and simultaneously degrading the amino carboxylic acid complexing agent. Compared with the traditional Fenton and ZVI/H2O2 type Fenton, the novel oxidation system also can react under neutral and alkaline conditions without additionally adding acid to adjust the acidity; the H2O2 can be generated in situ without being additionally added. The restoration method has the advantages of high degradation rate, environmental friendliness, simplicity in operation and low cost, and is an effective method for quickly and effectively restoring high-concentration organic contaminated site soil.

Description

technical field [0001] The invention belongs to soil remediation technology, and in particular relates to a method for remediating organically polluted soil. Background technique [0002] In recent years, with the rapid development of my country's urbanization process, the implementation of policies such as "retreating cities and entering parks", "industrial transfer" and the implementation of the "Stockholm Convention on Persistent Organic Pollutants (POPs)", almost all large-scale A large number of fine chemical, petrochemical, coal chemical, electronic and other enterprises in the old urban areas of mid-city have been relocated or closed, leaving a large number of chemically polluted sites in the city and surrounding areas. Most of these polluted sites have high concentrations of organic pollutants. For example, a literature monitoring and investigation on the soil of a pesticide factory found that the concentration of hexachlorohydrin (HCHs) in the soil was 1 to 440 mg / kg...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 陆晓华王琳玲周海燕曹梦华孙倩
Owner WUHAN HUAXINYUAN ENVIRONMENT TECH CO LTD
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