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A method and special equipment for repairing heavy metal polluted soil

A technology that pollutes soil and heavy metals, applied in the field of soil treatment, can solve the problems of practical, reliable and mature methods with few technologies, small biomass, and economic gains outweighing the benefits

Active Publication Date: 2016-03-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods have certain improvement effects on soil heavy metal pollution control, they also have relatively large limitations.
The physical method has a large investment cost and damages the soil structure, etc.; the chemical method is easy to introduce secondary pollution and reduce soil fertility; although phytoremediation technology is highly respected for its low cost, no damage to the soil structure and no secondary pollution, etc. , but most of the hyperaccumulator plants found so far are short, slow-growing, and have small biomass, which are difficult to apply in actual production
In conclusion, there are few practical, reliable and well-established methods and technologies for remediation of heavy metal-contaminated soils
Although electrokinetic remediation of polluted soil has good prospects, its application requires an external power supply system to continuously energize the polluted environment
Using precious power resources for the restoration and treatment of large-scale heavy metal-contaminated cultivated land is not only economically worthwhile, but may also cause ectopic pollution

Method used

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  • A method and special equipment for repairing heavy metal polluted soil
  • A method and special equipment for repairing heavy metal polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, microbial fuel cell

[0039] The schematic diagram of the microbial fuel cell is shown in figure 1 As shown, it includes anode area 1, anion membrane 6, detoxification area 3, filter membrane 7, cathode area 4, 300Ω external resistance 5, titanium wire and wire;

[0040] Wherein, the anode area is composed of an anode made of graphite felt (rectangular, 3mm×30mm×90mm) and a microbial culture solution inoculated on the anode;

[0041] The composition of this microbial culture solution is as follows: 2g / L sodium acetate, 4.4g / LKH 2 PO 4 、3.4g / LK 2 HPO 4 ·3H 2 O, 1.5g / LNH 4 Cl, 0.1g / LMgCl 2 ·6H 2 O, 0.1g / LCaCl 2 2H 2 O, 10ml / L trace element medium, ShewanellaoneidensisstrainMR-1 (ATCC700550);

[0042] Wherein, the composition of trace element culture medium is as follows: 1.25ml / L25%HCl, 210mg / LFeSO 4 ·7H 2 O, 3mg / LH 3 BO 3 , 10mg / LMnCl 2 4H 2 O, 19mg / LCoCl 2 ·6H 2 O, 2.4mg / LNiCl 2 ·6H 2 O, 14.4mg / LZnSO 4 ·7H 2 O, 3.6mg / LNa 2 MoO 4 2H...

Embodiment 2

[0052] The method for remediating heavy metal-contaminated soil comprises the following steps:

[0053] 1) The heavy metal-contaminated soil to be repaired was taken from rice soil heavily polluted by heavy metals in Zhuzhou, Hunan, which contained 11.6g / kg of zinc (Zn) and 840mg / kg of cadmium (Cd). Add 88 The ratio of gram 100 millimolar citric acid solution is mixed, obtains heavy metal contaminated soil solution;

[0054] 2) The sodium chloride aqueous solution in the detoxification zone in the microbial fuel cell obtained in Example 1 was replaced with the heavy metal-contaminated soil solution obtained in step 1), and after 78 days, the restoration of the heavy-metal-contaminated soil was completed.

[0055] figure 2 is the change of the amount of heavy metals removed from the soil over time during the remediation process. Two treatments are respectively set up, and in the current treatment, the two electrodes are connected through a 300 ohm resistor;

[0056] In no c...

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Abstract

The invention discloses a method for repairing heavy metal polluted soil and special equipment thereof. The special equipment is a microorganism fuel battery; a positive electrode region consists of a positive electrode and microorganism culture liquid inoculated on the positive electrode; a negative electrode region consists of a catalyst-loaded carbon material and a buffering solution; a detoxification region is separated from the negative electrode region through a filtering membrane; the detoxification region is a sodium chloride aqueous solution. The repairing method comprises the steps of (1) air-drying the heavy metal polluted soil to be repaired, and performing screening and dilution to obtain heavy metal pollution sludge; (2) replacing the sodium chloride aqueous solution in the detoxification region with a heavy metal polluted soil solution, keeping for 3 days to 6 months, and thus finishing repairing. According to the method, the microorganism fuel battery converts organic matters into current, and the generated current is used for electrically repairing the heavy metal polluted soil, so that the repairing treatment speed is high, and the cost is low; the metal is particularly suitable for removing electric pollutants from low-permeation soil.

Description

technical field [0001] The invention belongs to the field of soil treatment, and relates to a method for treating polluted soil, in particular to a method for repairing heavy metal polluted soil. Background technique [0002] With the development of my country's economy and the expansion of cities, the concentration of heavy metals in agricultural soil continues to increase, which has threatened the food safety of our country. The treatment methods for heavy metal-contaminated soil mainly include: 1) physical methods, including soil dumping, soil replacement, topsoil removal, guest soil, deep plowing, and electrodynamic methods; 2) chemical methods, including precipitation, adsorption, and chemical leaching 3) Biological method, using certain animals, plants and microorganisms to absorb, accumulate, degrade and transform pollutants. Although these methods have certain improvement effects on soil heavy metal pollution control, they also have relatively large limitations. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
Inventor 朱永官王亚洁孙国新梁建宏朱博恺陈正
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI