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Combined contaminated soil restoration system and using method thereof

A technology of composite pollution and restoration system, applied in the restoration of polluted soil and other directions, can solve the problems of easy blockage of isolation devices, poor treatment effect, low mass transfer efficiency, etc., to prevent direct pollution, save costs, and improve mass transfer efficiency. Effect

Active Publication Date: 2017-11-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The isolation device of the existing PRB technology is easy to block, resulting in low mass transfer efficiency and poor treatment effect

Method used

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  • Combined contaminated soil restoration system and using method thereof
  • Combined contaminated soil restoration system and using method thereof
  • Combined contaminated soil restoration system and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A remediation system for composite polluted soil and its application method. A rain-proof shed is set up above the composite polluted soil 19 to be repaired; figure 1 and figure 2 As shown, the surface of the compound polluted soil 19 to be repaired is provided with a moisture content controller 8; the left side of the compound polluted soil 19 to be repaired is provided with an anode permeable reaction wall and an anode tank 21 sequentially from the inside to the outside. The right side of the composite polluted soil 19 is provided with a cathode permeable reaction wall and a cathode tank 17 sequentially from the inside to the outside.

[0036] Such as figure 1 and figure 2 As shown, the anode permeable reaction wall, the anode tank 21, the compound polluted soil 19 to be repaired, the anode tank 21 and the cathode tank 17 are a rectangular block. Anode permeable reaction wall: anode tank 21: compound polluted soil to be repaired 19: cathode tank 17: the area rat...

Embodiment 2

[0052] A remediation system for composite polluted soil and its application method. Except following technical parameter, all the other are with embodiment 1:

[0053] The anode permeable reaction wall: anode tank 21: complex polluted soil to be repaired 19: cathode tank 17: the area ratio of the cathode permeable reaction wall is 1:1~2:5~30:1~2:1 .

[0054] The voltage of the constant voltage DC power supply 7 is 0.8 ~ 1.3V / cm 2 .

[0055] The moisture content of the composite polluted soil 19 to be repaired in the system is 38-43%.

[0056] The hourly circulation flow rate of the cathode buffer solution and the anode buffer solution is 3 to 8 times the volume of the cathode tank, and the circulation time is 7 to 15 days, at the 1.3 to 1.8 days of the circulation flow.

[0057] The enzyme activity of the laccase enzyme solution is 10-30 U / mL.

[0058] The volume ratio of the laccase:ABTS:anode buffer solution is (0.1-0.8):(0.1-0.8):1.

[0059] The volume ratio of the la...

Embodiment 3

[0063] A remediation system for composite polluted soil and its application method. Except following technical parameter, all the other are with embodiment 1:

[0064] The anode permeable reaction wall: anode tank 21: complex polluted soil to be repaired 19: cathode tank 17: the area ratio of the cathode permeable reaction wall is 1: (2~3): (25~50): ( 2~3): 1.

[0065] The voltage of the constant voltage DC power supply 7 is 1.0~1.5V / cm 2 .

[0066] The composite polluted soil 19 to be repaired in the system has a water content of 40-45%.

[0067] The hourly circulation flow rate of the cathode buffer solution and the anode buffer solution is 5-10 times of the volume of the cathode tank, and the circulation time is 12-20 days, which is in the 1.5-2.0 days of the circulation flow.

[0068] The enzyme activity of the laccase enzyme solution is 20-40 U / mL.

[0069] The volume ratio of the laccase:ABTS:anode buffer solution is (0.5-1):(0.5-1.0):1.

[0070] The volume ratio of ...

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Abstract

The invention relates to a combined contaminated soil restoration system and a using method thereof. According to the technical scheme, an anode infiltration mode reaction wall and an anode groove (21) are sequentially arranged on the left side of to-be-restored combined contaminated soil (19) from inside to outside, and a cathode infiltration mode reaction wall and a cathode groove (17) are sequentially arranged on the right side of the to-be-restored combined contaminated soil (19) from inside to outside. The anode infiltration mode reaction wall is composed of a first inorganic permeable membrane (4), a second inorganic permeable membrane (5) and geotechnical cloth (6); and the cathode infiltration mode reaction wall is composed of a third inorganic permeable membrane (11), a fourth inorganic permeable membrane (12) and geotechnical cloth (10). An anode laccase / ABTS mediator system (20) is added into the anode infiltration mode reaction wall, and a cathode laccase / ABTS mediator system (18) is added into the cathode infiltration mode reaction wall; and the voltage of a constant-voltage DC source (7) is 0.5 V / cm<2> to 1.5 V / cm<2>. The combined contaminated soil restoration system is environment-friendly, simple in structure, convenient to operate, small in original soil disturbance, and capable of achieving heavy metal and PAHs degradation and migration at the same time.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation. In particular, it relates to a remediation system for composite polluted soil and a method for using the same. technical background [0002] Polycyclic aromatic hydrocarbons (PAHs) are common pollutants in industrial (waste) sites. They exist in the production of coking, oil refining, waste incineration, pesticides, electronic and electrical processing, and wood preservative processing and in the soil of surrounding areas. PAHs are a typical class of persistent organic pollutants (Persistent Organic Pollutants, POPs), with low water solubility, high fat solubility, semi-volatile and refractory, will stay in the environmental medium for a long time, and between the environmental medium Inter-interface migration, posing a serious threat to the health of residents. Soil PAHs pollution has three characteristics (Basheer C, Obbard J P, Keelee H. Persistent organic pollutants in...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 任大军康晨黄朝凡邓志群郭慧文张淑琴张晓晴
Owner WUHAN UNIV OF SCI & TECH
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