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Heavy metal polluted soil remediation device and method

A technology of polluted soil and remediation method, which is applied to a device for remediating heavy metal-contaminated soil by bioleaching and plant adsorption, and in the field of remediation of heavy metal-contaminated soil, which can solve environmental pollution and other problems, achieve convenient use, reduce remediation costs, and simple structure Effect

Active Publication Date: 2013-03-20
北京亿利生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bioleaching remediation will also produce a leachate with high concentrations of heavy metals and rich in N and P. In addition, the leachate may contain some toxic and harmful substances, which will pollute the environment.

Method used

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  • Heavy metal polluted soil remediation device and method
  • Heavy metal polluted soil remediation device and method
  • Heavy metal polluted soil remediation device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Heavy metal contaminated soil remediation device, see Figure 1 to Figure 2 , including a peristaltic pump 1 , a bioleaching reactor 2 , a microporous filter column 3 , a regulating tank 4 and a plant treatment tank 5 which are sequentially connected in a loop through communication pipes.

[0026] The top of the bioleaching reactor 2 is provided with a sample inlet 21, an agitator 22 inside, an aeration device 23 on the outer wall, and a sample outlet 24 at the bottom, and the gas outlet of the aeration device 23 is located in the bioleaching reactor 2; a first control valve 6 is provided between the bioleaching reactor 2 and the microporous filter column 3, a second control valve 7 is provided between the regulating tank 4 and the plant treatment tank 5, and the bottom of the plant treatment tank 5 is provided with The third control valve 8.

[0027] In the present invention, a columnar connector 25 is also provided, one end of which communicates with the bottom of th...

Embodiment 2

[0030] Utilize the heavy metal contaminated soil remediation device of embodiment 1 to once process heavy metal contaminated soil, the method is as follows:

[0031] (1) Add the soil to be treated, sulfur powder, sulfur oxidizing bacteria inoculum and water into the bioleaching reactor 2, stir and aerate, and perform leaching reaction to obtain a reaction mixture; the reaction conditions are as follows: the soil, sulfur The weight ratio of powder, sulfur oxidizing bacteria inoculum and tap water is (40-60): (40-60): (3-5): 1000; the aeration rate is 0.5×10 -8 -1.0×10 -8 QUR -1 , the stirring intensity is 150-200r / min, the leaching reaction temperature is 20-30°C, and the leaching reaction time is 10-15 days.

[0032] (2) Filter the reaction mixture through the microporous filter column 3 and discharge it into the regulating tank 4, add water to the original water volume, and adjust the pH to 5-7 to obtain a leachate; use the sample outlet 24 to discharge the soil;

[0033] ...

Embodiment 3

[0040] Utilize the heavy metal-contaminated soil remediation device of embodiment 1 to recycle the heavy-metal-contaminated soil, the method is as follows:

[0041] (a) Close all control valves, inject water from the inlet 21 to the height of 2 to 3 / 4 of the bioleaching reactor. Add soil to be treated, sulfur powder, sulfur oxidizing bacteria inoculum; wherein, the weight ratio of soil, sulfur powder, sulfur oxidizing bacteria inoculum and tap water is 50:50:4:1000, open agitator 22 and aeration device 23, Aeration rate 0.5×10 -8 QUR -1 , the stirring intensity is 150r / min, the treatment temperature is 25°C, and the treatment time is 14 days.

[0042](b) Open the fourth control valve 9, and close the fourth control valve 9 after the reaction mixture enters the cylindrical connector 25; open the first control valve 6, and the reaction mixture enters the regulating tank 4 through the microporous filter column 3, Close the first control valve 6; close the agitator 22 and the a...

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Abstract

The invention provides a heavy metal polluted soil remediation device. The device comprises a peristaltic pump, a bioleaching reactor, a micro-pore filtering column, an adjusting groove and a plant processing groove, which are sequentially connected with one another through a communication pipeline to form a ring, wherein a sample feeding opening is arranged at the top of the bioleaching reactor; an agitator is arranged inside the bioleaching reactor; an aeration device is arranged on the outer wall of the bioleaching reactor; a sample discharging opening is arranged at the bottom of the bioleaching reactor; an air outlet of the aeration device is arranged inside the bioleaching reactor; a first control valve is arranged between the bioleaching reactor and the micro-pore filtering column; a second control valve is arranged between the adjusting groove and the plant processing groove; and a third control valve is arranged at the bottom of the plant processing groove. The invention further provides a method for processing heavy metal polluted soil by the device. The device has the advantages of simple structure, convenience for use, low utilization cost, high processing efficiency and good processing effect.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and in particular relates to a device for jointly remediating heavy metal-contaminated soil by using biological leaching and plant adsorption, and also relates to a method for remediating heavy metal-contaminated soil by using the device. Background technique [0002] The pollution of heavy metals in the environment has become more and more serious due to human industrial and agricultural production activities. A considerable part of these heavy metals remain in the soil, which seriously threatens the ecological environment. The existing remediation methods for heavy metal contaminated soil mainly include chemical leaching and solidification remediation, electrokinetic remediation, phytoremediation and microbial remediation. [0003] Chemical leaching and curing repair costs are high and are prone to secondary pollution, while electrokinetic repair cathodes will generat...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 李轶蒯广东丁海霞张文龙王大伟
Owner 北京亿利生物科技有限公司
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