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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 / H 2 o 2 Fenton-like, requires the use of a large amount of acid, which has an acidifying effect on the soil, and needs to add a large amount of H 2 o 2 , while H 2 o 2 It is also inconvenient to store and transport

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0029] For water-soluble 2,4-dichlorophenol (2,4-DCP) contaminated simulated kaolin, different aminocarboxylic acid complexing agents (ethylenediamine disuccinic acid, EDDS) were used to carry out the ZVI / EDDS / Air system Oxidative degradation experiments. The concentration of 2,4-DCP in contaminated soil was 233mg / 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 aminocarboxylic acid complexing agent solution volume (mL) was 1:5. Add 100g of simulated polluted soil and 500ml of EDDS aqueous solution with a concentration of 0.01mmol / L into the slurry reactor, and add 2g of iron powder at the same time. The reaction was started under normal temperature and pressure (30°C, 1 atm). After 3 hours of reaction, the degradation rate of DCP in the soil was 93.4%, and the degradation rate of EDDS was 91.4%. After 3.5 hours of reaction, the DCP in the system was completely degraded, and the de...

Embodiment 3

[0031]For the hydrophobic organic contaminated soil, the organic pesticide contaminated 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 with pH 6.38 and organic matter content of 0.85%. 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 the mass (g) of organic contaminated soil to the volume (mL) of aminocarboxylic acid complexing agent solution was 1:8. Add 50g of polluted soil and 400ml of aqueous solution into the slurry reactor, the concentration of EDTA in the aqueous solution is 0.2mmol / L, add 2.5g of iron powder at the same time, use a magnetic stirrer to stir the slurry at a speed of 800rpm, and use an air pump to pump in air. The flow rate was controlled at 1 L / min by a fl...

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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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