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Leaching and removing method and device of PAHs in polluted soil

A technology of polluted soil and leaching, which is applied in the restoration of polluted soil and other directions, can solve the problems of unreported treatment technology and treatment facilities, difficult control of environmental conditions, long repair time, etc., and achieves good removal effect, simple structure, Applicable high performance effect

Inactive Publication Date: 2011-08-10
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitations of bioremediation include the influence of pollutant content, the influence of environmental factors, etc., and the restoration time is long
[0004] Contaminated soil treatment technology can be divided into two types: in-situ treatment and ex-situ treatment. Ex-situ treatment technology is to transport the contaminated soil to a specific project site for treatment. This method can ensure ideal treatment conditions, so the treatment of contaminated soil Good effect and can prevent the transfer of pollutants, but the cost is high
The in-situ treatment method is directly treated in the polluted area, which can generally save labor costs and transportation costs, but because the environmental conditions are not easy to control, it is necessary to select and determine technical parameters before treatment
[0005] The treatment technology of high-content PAHs-contaminated soil has attracted more and more attention from environmental scientists in my country, but it is still only in the stage of small-scale laboratory tests. As an engineering-scale application, especially the more standardized treatment technology and treatment facilities have not been reported.

Method used

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  • Leaching and removing method and device of PAHs in polluted soil
  • Leaching and removing method and device of PAHs in polluted soil
  • Leaching and removing method and device of PAHs in polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 and 2 As shown, the rinsing removal device: includes a rinsing column 2, a drain pipe 1 and a collection cup 5, the lower end of the leaching column 2 is provided with a liquid inlet 7 controlled by a switch 8, and the upper end is connected to the collection cup through the drain pipe 1. 5 phase connection. The switch is generally open and is used to control eluent from entering the column.

[0023] The drain pipe 1 is n-shaped, one end of which is connected to the upper end of the rinsing column 2 , and the other end is connected to the collection cup 5 .

[0024] The liquid inlet 7 is connected to one end of the infusion tube 14 through the reducing head 13 , and the infusion tube 14 is connected to the liquid storage bottle 12 through the infusion tube channel 16 of the peristaltic pump 9 . The rinsing and removing device is a plurality of infusion tubes 14 passing through the infusion tube channels 16 connected in parallel to the peristaltic pump 9; Th...

Embodiment 2

[0034] Removal method:

[0035] The polluted soil was collected from the high concentration PAHs polluted soil near the Beijing coking plant.

[0036] Lay glass wool and glass beads above and below the contaminated soil placed in the eluent column to prevent the contaminated soil from moving up and down with the eluent, and then the eluent moves from bottom to top in the eluent column, and the discharge after leaching The liquid enters the collection cup through the drain pipe, and then washes the contaminated soil to remove the PAHs pollutants. The eluent is biodiesel, and the eluent speed is 0.10ml / min. The eluent: soil (v / w) is 2 : 1.

[0037] The leaching column 2 is made of glass material with a height of 20cm, a diameter of 3cm, and a column glass material thickness of 3mm, which is used to treat polluted soil. The leaching column is first loaded with glass beads, the glass beads have a diameter of 3 mm, 3.5 mm glass wool is placed on the glass beads, and polluted soil...

Embodiment 3

[0045] Removal method:

[0046] The polluted soil was collected from the high concentration PAHs polluted soil near the Beijing coking plant. Lay glass wool and glass beads above and below the contaminated soil placed in the eluent column to prevent the contaminated soil from moving up and down with the eluent, and then the eluent moves from bottom to top in the eluent column, and the discharge after leaching The liquid enters the collection cup through the drain pipe, and then rinses the contaminated soil to remove the PAHs pollutants. The leaching agent is TW80 aqueous solution. The TW80 (purchased from Sinopharm Chemical Reagent Co., Ltd.), the concentration of the TW80 aqueous solution is 10%, the leaching speed is 0.15ml / min, and the leaching agent:soil (v / w) is 2:1.

[0047] The leaching column 2 is made of glass material with a height of 20cm, a diameter of 3cm, and a column glass material thickness of 3mm, which is used to treat polluted soil. The leaching column is ...

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Abstract

The invention relates to a treatment technology for polluted soil with high content of PAHs (PolycyclicAromaticHydrocarbons), in particular to a leaching and removing method and device of PAHs in polluted soil. The leaching and removing method of PAHs in polluted soil comprises the steps of: laying glass wools used for avoiding the polluted soil moving vertically along with a leacheate on and under the polluted soil arranged in a leaching column, and then enabling the leacheate to move from bottom to top in the leaching column to leach the polluted soil so as to remove the PAHs pollutants, wherein biodiesel is adopted as the leacheate. The leaching and removing device of PAHs comprises the leaching column, a draining pipe and a collecting cup, wherein a liquid inlet controlled by a switch is arranged at the lower end of the leaching column, and the upper end of the leaching column is connected with the collecting cup through the draining pipe. The leaching and removing method provided by the invention has high efficiency for treating polluted soil with high content of PAHs. When the leaching and removing method and device are used for treating the soil of a gas plant, the biodiesel is adopted as the leacheate when the total amount of 12 types of PAHs in soil is 996.85 mg / kg; and when the ratio of the leacheate to the soil (v / w) is 2:1, the total amount of PAHs in the soil can be reduced to 377.03 mg / kg, and the removing rate of all the 12 types of PAHs is 62.18 percent.

Description

technical field [0001] The invention relates to a treatment technology for high-content PAHs polluted soil, in particular to an experimental method and device for leaching and removing polluted soil. Background technique [0002] At present, the form of soil pollution in our country is very serious, and the ecological safety of agricultural products caused by soil pollution can no longer be ignored. Because the soil has a sink effect on environmental pollution, toxic and harmful chemicals in the soil are transmitted through the atmosphere and water bodies, which can endanger the survival, reproduction and life safety of humans and animals. Therefore, the remediation of contaminated soil has become a hot and challenging field of environmental science research. [0003] Contaminated soil remediation techniques can be divided into three types: physical, chemical, and biological. The physical methods mainly include physical separation, solution rinsing, solidification and stabi...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 巩宗强王晓光孙翼飞图影吴进保张海荣
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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