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Microbial fuel cell bonsai and method for in-situ hexavalent chromium-polluted soil remediation

A fuel cell and in-situ remediation technology, applied in biochemical fuel cells, botanical equipment and methods, restoration of contaminated soil, etc., can solve problems such as environmental impact, cumbersome process, and multiple processing, and achieve no management and simple operation Effect

Active Publication Date: 2014-08-13
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it is difficult to apply in-situ ecological restoration to the heavily polluted upper soil. The current conventional method is to remove the upper soil as a whole for extraction until the soil reaches the pollution control index limit of general industrial solid waste landfill, and then send it to the landfill for disposal. The detoxification solution is processed separately
This method needs to use a lot of manpower, material and financial resources, requires multiple treatments, the process is cumbersome, and has a lot of impact on the local environment

Method used

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  • Microbial fuel cell bonsai and method for in-situ hexavalent chromium-polluted soil remediation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] As shown in Fig. 1, a microbial fuel cell potted plant includes a flowerpot 8, a plant 1, a battery 2, and a light source 3 planted in the flowerpot 8.

[0042] The wall structure of the flowerpot 8 from the outside to the inside is the plastic mesh film layer 4, the graphite cathode layer 5, the glass fiber layer 6 and the graphite anode layer 7; the plastic mesh film layer 4 and the plastic mesh film layer 4 are made of rigid The pore size of the plastic mesh membrane layer is 1-10mm. The graphite cathode layer 5 is detachably connected between the plastic mesh membrane layer 4 and the glass fiber layer 6. The graphite cathode layer can be removed from the plastic mesh membrane The layer 4 and the glass fiber layer 6 are drawn out, and the graphite anode layer 7 is bonded to the glass fiber layer 6.

[0043] The graphite cathode layer 5 and the graphite anode layer 7 are connected to the battery 2 by wires, and the battery 2 is connected to the light source 3, which provid...

Embodiment 2

[0049] The plant selected in this embodiment is sweet potato with a pot diameter of 50 cm and a pot spacing of 50 cm. The anode uses a graphite board with a rough surface, and the cathode uses a graphite board after scratching the surface. Others are the same as in Example 1.

[0050] In this example, the content of hexavalent chromium in the contaminated soil was 800mg / Kg. After 70 days, the hexavalent chromium content dropped to 207mg / kg, and the total chromium dropped to 250mg / kg, reaching the allowable standard of my country's "Soil Environmental Quality Standard" GB15618-1995 After 140 days, the hexavalent chromium content dropped to 45mg / kg, and the total chromium dropped to 50mg / kg.

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Abstract

The invention discloses a microbial fuel cell bonsai and a method for in-situ hexavalent chromium-polluted soil remediation. The microbial fuel cell bonsai comprises a flowerpot and a plant planted in the flowerpot, and the structure of the wall of the flowerpot is composed of a plastic reticular film layer, a graphite cathode layer, a glass fiber layer and a graphite anode layer sequentially form the outside to the inside; the graphite cathode layer and the graphite anode layer are connected with a storage battery through wires, and the storage battery is connected with a light source; the mixture of unpolluted soil and activated sludge is filled in the flowerpot. The invention is an in-situ soil remediation technique which utilizes the mechanism of the cathodic reduction of the microbial fuel cell (MFC), the MFC is a new technique which can convert organic matter energy into electric energy, and thereby the microbial fuel cell bonsai not only can reduce hexavalent chromium by means of the cathode, but also can generate and store electric energy.

Description

Technical field [0001] The invention relates to soil microbial fuel cell technology, in particular to a microbial fuel cell potted plant for in-situ restoration of soil hexavalent chromium pollution. Background technique [0002] Chromium compounds can produce toxic effects. Among them, hexavalent chromium, which has the strongest ability to oxidize and penetrate body membranes, is 100 times more toxic than trivalent chromium. It is extremely toxic to humans, organisms and vegetation, causing skin cancer, glands Cancer and other diseases. [0003] The chromium pollution in the soil is more difficult to deal with because of its carrier. Today's soil hexavalent chromium pollution can be divided into two categories, the lower layer slightly pollutes the soil, and the upper layer heavily pollutes the soil. The main treatment method for the lower level of lightly polluted soil is bioremediation. A large number of trees and grasses suitable for the local environment are planted in the ...

Claims

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Application Information

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IPC IPC(8): A01G9/02A01G1/00B09C1/08B09C1/10H01M8/16
CPCY02E60/527Y02E60/50
Inventor 冯华军梁禹翔张学勤丁养城王炎锋黄敏锐沈东升龙於洋申屠佳丽
Owner ZHEJIANG GONGSHANG UNIVERSITY
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