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Method of removing chlorohydrocarbon in underground water by using alkaline slow-release persulfate oxidizing agent

A persulfate, slow-release technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of soil and groundwater persistence reduction, consumption, low soil permeability, etc., to achieve simple production process, improve transmission efficiency, overcome The effect of acidification

Inactive Publication Date: 2014-05-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When applying persulfate in-situ remediation technology, it is often used to inject liquid into the ground, and persulfate liquid is easily consumed by reducing substances in the underground environment during the transmission process, resulting in a decrease in its persistence in soil and groundwater
In addition, the soil in the area where the pollutant is located may have low permeability, making it difficult for the injected liquid to penetrate the soil and come into contact with the pollutant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Alkaline slow-release persulfate oxidant formula: sodium persulfate 20g, cement 40g, sand 6g, water 17g, sodium hydroxide 6.7g (the molar ratio of sodium hydroxide and sodium persulfate is 2:1).

[0023] Dissolve 6.7g of sodium hydroxide in 17g of water and cool to room temperature. Add 20g of sodium persulfate, 40g of cement and 6g of sand to the sodium hydroxide solution, stir and mix evenly, and pour into the mold. The inner shape of the mold is a cylinder with a diameter of 3.175cm and a height of 2cm. It is maintained at room temperature (20±1°C) for 7 days. After shaping, it is taken out from the mold to make alkaline slow-release persulfate oxidizer.

[0024] At room temperature, the prepared oxidant was placed in 100 mL of a solution with a concentration of 20 mg / L of trichlorethylene, and the removal rate of trichlorethylene reached 97.7% after 1 day. The concentration of sodium persulfate in the solution was 32.7 g / L, and the pH of the solution was is 12.3, i...

Embodiment 2

[0026] Alkaline slow-release persulfate oxidant formula: sodium persulfate 20g, cement 40g, sand 6g, water 17g, sodium hydroxide 6.7g (the molar ratio of sodium hydroxide and sodium persulfate is 2:1).

[0027] Dissolve 6.7g of sodium hydroxide in 17g of water and cool to room temperature. Add 20g of sodium persulfate, 40g of cement and 6g of sand to the sodium hydroxide solution, stir and mix evenly, and pour into the mold. The inner shape of the mold is a cylinder with a diameter of 3.175cm and a height of 2cm. It is maintained at room temperature (20±1°C) for 7 days. After shaping, it is taken out from the mold to make alkaline slow-release persulfate oxidizer.

[0028] At room temperature, the prepared oxidant was placed in 100mL of a solution with a tetrachlorethylene pollution concentration of 20mg / L, and the removal rate of tetrachlorethylene reached 98.2% after 1 day, the concentration of sodium persulfate in the solution was 30.5g / L, and the pH value of the solution w...

Embodiment 3

[0030] Alkaline slow-release persulfate oxidant formula: sodium persulfate 20g, cement 40g, sand 6g, water 17g, sodium hydroxide 6.7g (the molar ratio of sodium hydroxide and sodium persulfate is 2:1).

[0031] Dissolve 6.7g of sodium hydroxide in 17g of water and cool to room temperature. Add 20g of sodium persulfate, 40g of cement and 6g of sand to the sodium hydroxide solution, stir and mix evenly, and pour into the mold. The inner shape of the mold is a cylinder with a diameter of 3.175cm and a height of 2cm. It is maintained at room temperature (20±1°C) for 7 days. After shaping, it is taken out from the mold to make alkaline slow-release persulfate oxidizer.

[0032] At room temperature, the prepared oxidant was placed in 100mL of 1,1,1-trichloroethane solution with a pollution concentration of 20mg / L. After 7 days, the removal rate of 1,1,1-trichloroethane reached 72.2%. The concentration of sodium persulfate was 25.0g / L, and the pH value of the solution was 12.4, whic...

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Abstract

The invention relates to a method of removing chlorohydrocarbon in underground water by using an alkaline slow-release persulfate oxidizing agent. The alkaline slow-release persulfate oxidizing agent is prepared by mixing persulfate, sodium hydroxide, cement, sand and water according to a certain proportion; when the obtained oxidizing agent is contacted with polluted underground water, the persulfate is slowly released for a long time, the pH value of the solution can be improved, the acidification effect of the persulfate reaction process is overcome, chlorohydrocarbon pollutants are effectively degraded through a mode of alkaline activation persulfate. The method has the advantages that the provided alkaline slow-release persulfate oxidizing agent can be used for slowly releasing the persulfate for a long time, the transmission capability and use efficiency of the oxidizing agent are improved, the chlorohydrocarbon pollution underground water is remedied through the mode of alkaline activation persulfate, and the method is applicable for in-situ remediation.

Description

【Technical field】 [0001] The invention relates to the field of groundwater pollution restoration, in particular to a method for treating chlorinated hydrocarbon pollution in groundwater with alkaline slow-release persulfate. 【Background technique】 [0002] With the relocation of industrial polluting enterprises in my country's cities and the unreasonable discharge of industrial "three wastes" and other reasons, the problem of soil and groundwater pollution has become very serious. Chlorinated hydrocarbon solvents are important chemical raw materials and organic solvents, widely used in chemical, pharmaceutical, electronics, leather, printing and other industries. Due to improper operation in the process of production, use, transportation, storage, etc., it has become one of the widespread organic pollutants in groundwater. Most chlorinated hydrocarbons are heavy non-aqueous liquids with high volatility, low viscosity, low water solubility, and refractory properties. Most of...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 吕树光顾小钢阮晓昕臧学轲吴小亮繆周伟徐旻辉司马菁珂邱兆富隋倩
Owner EAST CHINA UNIV OF SCI & TECH
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