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Method for heavy metal elimination or precious metal recovery using microbial fuel cell

A technology of fuel cells and microorganisms, applied in biochemical fuel cells, fuel cell additives, chemical instruments and methods, etc., can solve the problems of harmful by-products and high processing costs

Inactive Publication Date: 2013-06-12
RM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no technical reports on the removal of heavy metals and the recovery of precious metals using microbial fuel cells
[0006] The aforementioned heavy metal removal methods have the disadvantages of high processing costs and harmful by-products. Compared with microbial fuel cells, which have the advantage of using organic waste to remove heavy metals or recover precious metals and generate electricity at the same time, it can naturally generate electricity from waste water. removal of organic matter

Method used

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  • Method for heavy metal elimination or precious metal recovery using microbial fuel cell
  • Method for heavy metal elimination or precious metal recovery using microbial fuel cell
  • Method for heavy metal elimination or precious metal recovery using microbial fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Example 1: Removal of mercury in wastewater

[0093] Hg Removal from Mercury-Containing Wastewater (MWW) Using MFC Technology 2+ ions, we studied the effect of factors such as initial concentration and initial pH on the Hg 2+ The effect of ion removal rate.

[0094] The MFC is assembled in this way: carbon felt is used for the anode (oxide electrode, positive electrode), carbon paper is used for the cathode (reduction electrode, negative electrode), and an anion exchange membrane is used for the membrane between the two electrode chambers.

[0095] (1) MFC installation

[0096] The present invention uses a double-chamber MFC whose electrode chamber is made of resin glass. The volume of the electrode chamber is 137ml (length: 7cm, diameter 5cm), and the effective volume of each electrode chamber is 120ml. Anion exchange is used between the two electrode chambers. Separated by touch (AEM, AMI-7001, Membrane International Inc., USA), the anion exchange membrane area is ...

example 2

[0132] Example 2: from containing Cr 6+ / Cr 3+ Cr removed from wastewater 6+ / Cr 3+

[0133] Figure 7 is a removal of Cr 6+ / Cr 3+ Schematic of the two-chamber MFC. This dual-chamber MFC can provide the front-end voltage to the end when the end voltage is insufficient, so as to remove or recycle metal. Various ions can be removed or recovered using this method.

[0134] In the present example, the conditions of the cathode compartment are listed in Table 2.

[0135] Table 2

[0136]

No. 1 reduction electrode room

No. 2 reduction electrode room

ion

Cr 6+

Cr 3+

Material

Carbon brush 2.5x2.5cm

Carbon cloth 1.7x1.3cm

volume

100ml

100ml

ion concentration

200ppm

100ppm

film

CEM

AEM

pH value

2

Unadjusted, 6.4

K 2 SO 4 concentration

200mM

200mM

Stirring method

Remove N 2

Remove N 2

[0137] Figure 8-12 is shown to use a...

example 3

[0140] Example 3: Removal of As in wastewater 5+ / As 3+

[0141] Figure 15 is to remove As 5+ / As 3+ Schematic setup of the dual-chamber MFC. This dual-chamber MFC is used when the voltage of the rear battery is insufficient, and the voltage provided by the front battery can be used to remove or recover metals. This method can be used to remove or recover a variety of ions.

[0142] Shown in Table 3 are the conditions for the cathode.

[0143] table 3

[0144]

No. 1 reduction electrode room

No. 2 reduction electrode room

ion

As 5+

As 3+

Material

Carbon brush 2.5*2.5cm

Carbon cloth 1.7*1.3cm

volume

100mL

100mL

ion concentration

100ppm

50ppm

film

CEM

CEM

pH value

2

Unadjusted, 9.5

K 2 SO 4 concentration

200mM

200mM

Stirring method

remove N2

remove N2

[0145] Figures 16 to 20 Indicates that it is used to remove AS i...

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Abstract

The present invention relates to a method in which a microbial fuel cell (MFC) is used in order to produce electrical power while also either eliminating a heavy metal or recovering a precious metal from waste water containing the heavy metal or the precious metal, and, more particularly, the invention has advantages including effective elimination of Hg2+ in the form of a solid precipitate or deposit of Hg or Hg2Cl2, and, incidentally, power is produced, by-products are rendered harmless and long-term economic operation is achieved.

Description

technical field [0001] The invention relates to the use of microbial fuel cells to remove heavy metals or recover precious metals from waste water containing precious metals or heavy metals, and simultaneously generate electricity. Background technique [0002] Mercury is the most important cause of environmental pollution among heavy metals. Mercury exists mainly in three forms: elemental mercury, inorganic mercury compounds and organic mercury compounds. The complex of these three types of mercury is called total mercury. Inorganic mercury complexes including mercurous salt Hg + and mercury salt Hg 2+ And amalgam, organic mercury is mainly alkylmercury complexes. All forms of mercury are highly toxic, but each type has different effects on human health, especially methylmercury and Hg 2 Cl 2 May cause cancer. Mercury and its compounds are widely used in the production of paint, pulp, paper, petroleum refining, battery manufacturing and pharmaceutical processes. If ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28H01M8/16H01M8/04C02F3/34
CPCC02F1/469C02F2101/20C02F2101/22C02F2201/46115C02F2303/10H01M8/16C02F2001/46152C02F3/348C02F2001/46133C02F2101/206C02F2201/4616C02F2209/001C02F2209/02C02F3/005Y02W10/30Y02W10/37Y02E60/50C02F3/28H01M8/04C02F3/34C02F3/2853
Inventor 崔灿洙
Owner RM TECH
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