Chemical oxidation restoration method for organic polluted soil

A chemical oxidation and organic pollution technology, applied in the field of environmental engineering, can solve problems such as pollution, restricted soil permeability, shallow repair depth, etc., and achieve the effects of ensuring uniform mixing, improving oxidation effect, and low construction cost

Active Publication Date: 2015-05-20
NANJING KESHENG ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problems with these technologies are: the injection well needs to be excavated into the contaminated area, and the excavation will generate spoils, especially the polluted spoils need additional treatment
Secondly, these techniques are only applicable to unsaturated soils, and generally the restoration depth is relatively shallow, and are greatly limited by the permeability of the soil. These methods will not work when
Thirdly, the amount of reagent injection is not easy to con...

Method used

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  • Chemical oxidation restoration method for organic polluted soil

Examples

Experimental program
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Effect test

Embodiment 2

[0036] 830m of the organically polluted soil block of the former Nanjing Chemical Plant 2 , the organic pollutants in the soil are mainly o (p) nitrochlorobenzene, benzene, chlorobenzene, and nitrobenzene, with concentrations of 2430mg / kg, 212mg / kg, 350mg / kg, and 550mg / kg, respectively. Process according to the method of the present invention, the contaminated area is arranged 2500 sites according to the size of each site of 0.6 * 0.46m, when each site is processed, the speed of drilling rod drilling is 20m / h, when going down, Pass 30% sulfuric acid solution to adjust the pH value of the soil to 5; when lifting the drill, the speed is 20m / h, and the catalyst ferrous sulfate with a concentration of 10% and the hydrogen peroxide solution with a concentration of 15% are added through the pipeline switch, The dosage is 500L / h and 650L / h, and the concentration of organic pollutants in the soil is reduced to 16.15mg / kg and the concentration of benzene to 3.5mg / kg after sampling and ...

Embodiment 3

[0038] 750m of organically polluted soil from the former Nanjing Chemical Plant 2, the organic pollutants in the soil are mainly o (p) nitrochlorobenzene, benzene, chlorobenzene, and nitrobenzene, with concentrations of 2530mg / kg, 262mg / kg, 320mg / kg, and 510mg / kg, respectively. Process according to the method of the present invention, the polluted area is arranged 2500 sites according to the size of each site of 0.6 * 0.46m, when each site is processed, the speed of drill pipe drilling is 30m / h, when going down, Pass 30% sulfuric acid solution to adjust the pH value of the soil to 4.5; when lifting the drill, the speed is 30m / h, and the catalyst ferrous sulfate with a concentration of 20% and the hydrogen peroxide solution with a concentration of 25% are added through the pipeline switch, The dosage is 500L / h and 600L / h, and the concentration of organic pollutants in the soil is reduced to 24.15mg / kg and the concentration of benzene is reduced to 13.5mg / kg. , the concentratio...

Embodiment 4

[0040] 2000m of organically polluted soil from the former Nanjing Chemical Plant 2 , the organic pollutants in the soil are mainly o (p) nitrochlorobenzene, benzene, chlorobenzene, and nitrobenzene, with concentrations of 2480mg / kg, 234mg / kg, 340mg / kg, and 410mg / kg, respectively. Process according to the method of the present invention, the polluted area is arranged 2500 sites according to each site size is 0.6 * 0.46m, when each site is processed, the speed of drill pipe drilling is 15m / h, when going down, Add 30% sulfuric acid solution to adjust the pH value of the soil to 4; when the drill is lifted, the speed is 20m / h, and the catalyst ferrous sulfate with a concentration of 10% and the potassium permanganate solution with a concentration of 10% are added through the pipeline switch , the dosage is 500L / h and 600L / h, after the treatment, the sample is taken at intervals of two days. kg, the concentration of chlorobenzene decreased to 6.9 mg / kg, and the concentration of ni...

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Abstract

The invention provides a chemical oxidation restoration method for organic polluted soil. The chemical oxidation restoration method for the organic polluted soil comprises the step of injecting a pH regulating agent, an oxidizing agent and a catalyst in situ to oxidize organic matters in soil and specifically comprises the following steps: in a to-be-restored soil region, drilling and stirring to the to-be-restored depth by utilizing a bored pile drilling machine, pumping the pH regulating agent by virtue of a flexible pipe arranged inside a drill rod by adopting a pump while the drill rod drills into the soil, uniformly distributing a medicament into the soil under the stirring action of the drill rod, and regulating pH of the soil to be in an appropriate range; and under the condition that a drill lifting rod is used for stirring, switching to an oxidizing agent pipeline and a catalyst pipeline by utilizing a valve, and pumping the oxidizing agent and the catalyst as well as a chelating agent into the soil by virtue of a pump, so that oxidative degradation on organic pollutants in the soil is realized.

Description

technical field [0001] The invention relates to a method for chemical oxidation restoration of organic polluted soil, which belongs to the technical field of environmental engineering and is suitable for restoration of various types of organic polluted soils such as chemical industry, petroleum, medicine and pesticide. Background technique [0002] With the rapid development of the modern chemical industry, more and more organic pollutants enter the soil and groundwater, which are difficult to be degraded by microorganisms in the environment, resulting in increasingly serious soil pollution. Now, with the acceleration of urbanization and industrialization in our country, especially the adjustment of urban layout and industrial structure, many chemical enterprises are closed or relocated. The production areas of chemical enterprises are polluted to varying degrees due to leakage during production and other reasons. The areas left after the closure or relocation of enterprise...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 高洪刚曹惠忠
Owner NANJING KESHENG ENVIRONMENTAL PROTECTION TECH
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