Advanced oxidization repair method for agricultural chemically contaminated soil

A technology of polluted soil and advanced oxidation, applied in the restoration of polluted soil, etc., can solve the problems of affecting soil performance, reducing oxidation efficiency, soil loss of function, etc., to achieve the effect of ensuring high efficiency and avoiding excessive acidification

Inactive Publication Date: 2012-05-09
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, in the remediation process, the control of soil pH has also become the focus of research. At present, many advanced oxidants can completely achieve the goal of pollutant removal, but due to improper pH control in the oxidation process, the oxidation efficiency is greatly reduced, and serious Affect the properties of the soil after treatment, resulting in soil compaction after treatment or even serious loss of soil function and unable to be reused

Method used

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  • Advanced oxidization repair method for agricultural chemically contaminated soil
  • Advanced oxidization repair method for agricultural chemically contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0025] At room temperature, according to the ratio of 43% potassium persulfate, 25% potassium bisulfate, 30% potassium sulfate, 1% sodium bisulfate, and 1% sodium sulfate, the advanced oxidant is prepared, and then mixed with agrochemical organic pollution according to the ratio of 1:2000 The soil is mixed, then adding 10% by weight of water and a pH regulator of 0.05 for conditioning, the composition by weight percentage is: calcium peroxide is 10%, calcium oxide is 30%, silicon oxide is 30%, positive The phosphate was 30%. After fully stirring and mixing, the pH of the soil sample was measured to be 7.8. Stacked outdoors at room temperature for 1 week, and covered the surface of the treated soil samples with ordinary light-shielding and water-proof materials to prevent the impact of rainwater seepage or sunlight on the reaction. After treatment, the concentration of pollutants in the soil before and after treatment was analyzed according to the US EPA 8270D method. The analy...

Embodiment 2

[0027] At room temperature, according to the ratio of potassium persulfate 50%, potassium bisulfate 26%, potassium sulfate 22%, sodium bisulfate 1%, sodium sulfate 1%, prepare advanced oxidant, and then mix it with agrochemical organic pollution according to the ratio of 1:5000 Mix finely, then add 10% by weight water and 0.1 pH regulator for conditioning, the composition by weight percentage is: calcium peroxide is 5%, calcium oxide is 25%, silicon oxide is 40%, orthophosphoric acid The salt content was 30%. After fully stirring and mixing, the pH of the soil sample was measured to be 7.2. Stacked outdoors at room temperature for 1 week, and covered the surface of the treated soil samples with ordinary light-shielding and water-proof materials to prevent the impact of rainwater seepage or sunlight on the reaction. After treatment, the concentration of pollutants in the soil before and after treatment was analyzed according to the US EPA 8270D method. The analysis results show...

Embodiment 3

[0029] At room temperature, according to the ratio of potassium persulfate 50%, potassium bisulfate 26%, potassium sulfate 22%, sodium bisulfate 1%, sodium sulfate 1% to prepare advanced oxidants, and then according to the ratio of 1:2000 with agrochemical organic pollution Finely mix, then add 10% by weight of water and 0.1 of pH regulator for conditioning, the composition by weight percentage is: calcium peroxide is 10%, calcium oxide is 30%, silicon oxide is 30%, orthophosphoric acid The salt content was 30%. After fully stirring and mixing, the pH of the soil sample was measured to be 8.3. Stacked outdoors at room temperature for 1 week, and covered the surface of the treated soil samples with ordinary light-shielding and water-proof materials to prevent the impact of rainwater seepage or sunlight on the reaction. After treatment, according to the US EPA 8270D method, the concentration of pollutants in the soil before and after treatment was analyzed. The analysis results ...

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Abstract

The invention discloses an oxidization repair method for agricultural chemically contaminated soil. The method comprises the following steps of: blending an oxidant and agricultural chemically contaminated soil of which the weigh ratio is 1:2,000 to 1:5,000 at the temperature of 15 to 30 DEG C; adding 10 percent of water and 0.05 to 0.1 weight percent of pH adjuster into the mixture; stirring and blending, wherein the stirring time is 30 to 60 minutes and the pH value is 6 to 9; and placing the mixture on an outdoor open field. At the normal temperature, the oxidant performs continuous slow oxidation and reduction reaction on organics in the contaminated soil, and after 6 to 10 days of reaction, the removal rate of contaminant in the agricultural chemically contaminated soil is up to over 90 percent. The invention provides an effective treatment way to the treatment of the agricultural chemically contaminated soil; the adding amount of medical agents is low; the repair efficiency is high; and secondary harm to environment is not caused in a repair process.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to the field of remediation of general agrochemical organic polluted soil. Background technique [0002] In the process of production, transportation and storage of agrochemical plants, due to improper operation or negligence, the leakage of raw materials, semi-finished products and products is often caused. However, due to the characteristics of the agrochemical industry, the components of the leaked chemicals are often complex and potentially dangerous in the environment, so they should be controlled and dealt with first. Among these chemical pollutants, a considerable part belongs to volatile organic compounds (VOCs). These chemical substances are often adsorbed in polluted soil, and will be desorbed under certain conditions, volatilized and inhaled by the human body or pollute the environment. In addition, the soil polluted by the agrochemical industry is ofte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 钟重裘知孙福成
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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