A device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method

A technology of organic pollution and remediation method, applied in the field of environmental protection pollution control, can solve the problems of long remediation period, high remediation cost, and large impact on polluted soil, and achieves the effects of convenient operation, short extraction time and high extraction efficiency

Inactive Publication Date: 2013-08-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, heat treatment has a great impact on contaminated soil, and some physical remediation methods also require some external conditions in use
Chemical remediation technology is suitable for dealing with emergency pollution accidents, but the disadvantage is that the remediation costs are high
The investment of bioremediation technology is less, but the repair period is longer

Method used

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  • A device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method

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Embodiment 1

[0038] A supercritical CO 2 The restoration method of the device for fluid restoration of organic polluted soil, the specific steps are as follows:

[0039] (1) Take the soil polluted by organic pollutants out of the polluted plot, and after soil crushing and pretreatment, put it into the stirring extraction kettle until the soil is not lumped and hardened, and the volume ratio of the added soil to the stirring extraction kettle is For (1~3): 10;

[0040] (2) Add methanol-water system into the stirring extraction tank, in which the volume concentration (v / v) of the methanol solution is 5%, as the improving agent, the volume ratio of the added improving agent to the stirring extraction tank is 1:10 ;

[0041] (3) Install all the lids of the stirring extraction kettle, and all the lids in the extraction kettle are equipped with sealing gaskets. Heat the filled stirring extraction kettle, and the stirring device in the stirring extraction kettle starts to stir. At this time, a...

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Abstract

The invention belongs to the technical field of environmental protection and pollution control, and in particular relates to a device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method. The device of the invention is composed of a CO2 storage tank, a pressure pump, an inlet valve, a pressure monitoring device, a soil pretreatment device, a stirring extraction vessel, a temperature control device, a pressure reducing valve, a gas-liquid separator, an organic pollutants storage tank and an organic pollutants filtering device. The method of the invention has the characteristics such as short extraction time, less solvent consumption, easy operation, high extraction efficiency, no pollution, and highly selective extraction realized through changing extraction conditions. Compared with traditional extraction techniques such as Soxhlet extraction, ultrasonic extraction, and accelerated solvent extraction, the method of the invention has the advantages such as short extraction time, no need of pre-concentration and purification, and no secondary pollution generated.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and pollution control, in particular to a supercritical CO 2 A device and a repairing method for fluid repairing organic polluted soil. Background technique [0002] With the continuous improvement of my country's productivity and the rapid development of industries such as industry and agriculture, various pollutants are discharged into the air, water and soil. As the ultimate destination of various pollutants, soil is enriched with a large number of various pollutants, and the accumulation of pollutants in soil has become one of the main environmental problems. [0003] In recent years, my country's coal chemical industry and other industries have developed extremely rapidly, and the pollutants produced by these enterprises in the production process will cause harm to the environment and human health. The soil pollution of industrial enterprises in our country is relatively se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 卢宏玮李振通何理
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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