Persulphate combined heating and activation method for environmental restoration

A technology of persulfate and activation method, applied in the restoration of polluted soil and other directions, can solve the problems of affecting the restoration effect, poor effect, fallback, etc., to expand the scope of use, improve the restoration effect, and reduce the effect of concentration rebound.

Inactive Publication Date: 2018-06-15
北京宜为凯姆环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali activation technology has a wide range of applications, but there are still the following deficiencies in the application process: (1) If the temperature of the project site is low, the reaction will be limited, resulting in a slow reaction rate and affecting the repair effect; (2) Alkali activation requires Stabilizing the pH in the optimal alkaline range is the most conducive to oxidation. However, in general projects, the pH needs to be restored to neutral after restoration to avoid soil alkalization, which requires higher alkali dosage in practical operations; (3) Alkaline pH may drop with the continuation of the reaction, and it is necessary to add alkali in time to maintain the best reaction conditions, otherwise the oxidation efficiency will be...

Method used

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  • Persulphate combined heating and activation method for environmental restoration
  • Persulphate combined heating and activation method for environmental restoration
  • Persulphate combined heating and activation method for environmental restoration

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The method that this embodiment is used to restore the pollution of chlorinated organic pollutants in the soil is as follows:

[0063] (1) Add ferrous sulfate and chelating agent to the soil after mixing, the content of iron is supplemented to 400mg / L, and the dosage of chelating agent EDTA is 10mM;

[0064] (2) Lay the homogenized soil into a pile of 2m×2m×1m, and insert 4 heating rods vertically during the laying process. After the pile and pipeline are laid, run the heating device to raise the temperature of the pile to 30°C , and keep it at around 30°C;

[0065] (3) injecting mass concentration in the soil heap is 5% hydrogen peroxide solution 1700kg, then injecting mass concentration is 25% sodium persulfate solution 480kg;

[0066] (4) inject hydrogen peroxide stabilizer malonate, wherein the dosage of malonate is 30mM;

[0067] (5) add water to transform it into a saturated state;

[0068] (6) When the temperature of the pile body is guaranteed to be about 30°...

Embodiment 2

[0072] The method that this embodiment is used to restore the pollution of chlorinated organic pollutants in the soil is as follows:

[0073] (1) Add ferrous sulfate and chelating agent to the soil after mixing, the content of iron is supplemented to 400mg / L, and the dosage of chelating agent EDTA is 10mM;

[0074] (2) Lay the homogenized soil into a pile of 2m×2m×1m, and insert 4 heating rods vertically during the laying process. After the pile and pipeline are laid, run the heating device to raise the temperature of the pile to 20°C , and keep it at around 20°C;

[0075] (3) injecting mass concentration in the soil heap is 5% hydrogen peroxide solution 1700kg, then injecting mass concentration is 25% sodium persulfate solution 480kg;

[0076] (4) inject hydrogen peroxide stabilizer malonate, wherein the dosage of malonate is 30mM;

[0077] (5) add water to transform it into a saturated state;

[0078] (6) When the temperature of the pile body is guaranteed to be around 20...

Embodiment 3

[0082] The method that this embodiment is used to restore the pollution of chlorinated organic pollutants in the soil is as follows:

[0083] (1) Add ferrous sulfate and chelating agent to the soil after mixing, the content of iron is supplemented to 400mg / L, and the dosage of chelating agent citric acid is 10mM;

[0084] (2) Lay the homogenized soil into a pile of 2m×2m×1m, and insert 4 steam injection pipes vertically during the laying process. After the pile and pipeline are laid, high-temperature hot steam is introduced to heat up the pile to 30°C and keep it around 30°C;

[0085] (3) injecting mass concentration in the soil heap is 4% hydrogen peroxide solution 1700kg, then injecting mass concentration is 25% sodium persulfate solution 480kg;

[0086] (4) inject hydrogen peroxide stabilizer malonate, wherein the dosage of malonate is 30mM;

[0087] (5) add water to transform it into a saturated state;

[0088] (6) When the temperature of the pile body is guaranteed to ...

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Abstract

A persulphate combined heating and activation method for environmental restoration comprises the steps that soil or a soil layer, containing organic pollutants, of a target restoration site is heatedto the temperature interval of 20-45 DEG C; under the condition of continuous heating and heat preservation, synergistic activation of hydrogen peroxide and chelating transition metal is implemented,the activation process is short in duration time but high in effect, the organic pollutants in the soil are promoted to be desorbed, and the degradation process of the organic pollutants is accelerated; and heating continues being conducted, and the continuous heat activation stage is started in a transition mode until the concentration of the target pollutants is decreased to be below a restoration target value. The restoration method adapts to environment restoration of soil and groundwater under cold regions/the low temperature environment, and is also an enhanced improved technology for semi volatile organic compound (SVOC) polluted soil which is difficult to restore through a general activation technology, the treatment effect can be effectively improved, thus engineer operation is not influenced by seasonal change, or the seasonal change influence is reduced, and the regional using range is expanded.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a persulfate combined heating activation method for environmental restoration. Background technique [0002] With the promulgation of the "Soil Pollution Prevention and Control Action Plan", the curtain of soil pollution prevention and control has officially opened. In recent years, domestic soil pollution incidents have occurred frequently, showing the characteristics of high pollution degree, great harm, complex pollution components, and difficult governance. The domestic soil organic pollution is very serious, and there are many kinds of pollutants. The pollutants in a single site may include one or more of benzene series, chlorinated solvents, polycyclic aromatic hydrocarbons, petroleum hydrocarbons, and pesticides, which increases soil environmental restoration. The difficulty of the work puts forward higher requirements for different restoration techniques...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/06
CPCB09C1/06B09C1/08B09C2101/00
Inventor 单晖峰陈俊华祝红张帅夫
Owner 北京宜为凯姆环境技术有限公司
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