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Method for recovering elemental copper from copper-containing wastewater with microbial fuel cell

A fuel cell and microorganism technology, applied in the fields of biochemical fuel cells, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of long start-up time and low copper recovery efficiency, achieve short start-up time, improve recovery efficiency, The effect of reducing the ohmic internal resistance

Inactive Publication Date: 2016-08-17
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The startup of CN 103397195 A needs 4 weeks (paragraph 0036 of the specification of CN 103397195 A), the startup time is too long, and the recovery efficiency of copper is low

Method used

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  • Method for recovering elemental copper from copper-containing wastewater with microbial fuel cell
  • Method for recovering elemental copper from copper-containing wastewater with microbial fuel cell
  • Method for recovering elemental copper from copper-containing wastewater with microbial fuel cell

Examples

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Embodiment 1）

[0033] The method for reclaiming elemental copper from copper-containing waste water with microbial fuel cell of the present embodiment comprises the following steps:

[0034] ① Construct a double-chamber MFC reactor.

[0035] The MFC reactor used in this example includes a cathode chamber and an anode chamber with the same volume, and the material is polyethylene. 300mL~500mL (the effective volume in this example is 500mL); the two electrode compartments are separated by a pretreated proton exchange membrane (Nafion TM 212, DuPont). The anode chamber and the cathode chamber are respectively equipped with an anode and a cathode, and the MFC anode is a graphite rod with an effective surface area of ​​31cm 2 ; MFC cathode is a graphite rod with an effective surface area of ​​31cm 2 . The two pole chambers are connected with wires, and a variable resistance box of 10Ω~100Ω is connected between the two pole chambers (the resistance is set to 50Ω in this embodiment). The anode...

Embodiment 2）

[0054] The method for reclaiming elemental copper from copper-containing wastewater by microbial fuel cell of the present embodiment is the same as in Example 1, except that:

[0055] The COD value of the anode substrate in step ③ is 850mg / L.

[0056] The power generation performance of the MFC of the present embodiment is shown in Figure 4 , the maximum current density of MFC is 0.6 mA·m -2 . After running for 190 hours, take out the cathode, and use a brush to scrape the bronze-colored deposits on the cathode into the product collector.

[0057] The XRD diffraction pattern of present embodiment cathode deposit sees Figure 5 According to the detection method of Example 1, sharp diffraction peaks appear in the cathode deposit diffraction pattern at 2θ of 43.9°, 50.4° and 73.6°, which are consistent with the characteristic peaks of elemental copper through computer retrieval; and the characteristics of cuprous oxide do not appear Peaks 36.4°, 43.2° and 61.4° and Cu 4 (OH...

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Abstract

The invention discloses a method for recovering elementary copper from copper-containing wastewater by using a microbiological fuel cell. The method comprises the following steps: (1): a double-chamber MFC reactor is built, MFC anode strains are domesticated and cultured, and anode substrates are led into the anode chamber, wherein the double-chamber MFC reactor comprises a cathode chamber, an anode chamber and a data collection system, and the cathode chamber and the anode chamber are separated by a proton exchange membrane; (2): in the domesticated and cultured anode strains and calcium phosphate buffer solutions, the COD value of the anode substrates is larger than 850mg / L, and the volume ratio of the anode strains and the anode substrates is 1:(8-14); copper-containing wastewater solutions are led into the cathode chamber to be used as catholyte. When the density of electric current produced by the MFC is 0.1-4.5mA.m<-2>, bronzed substances are separated out from a cathode, after the operation is performed for 190 hours to 400 hours, the cathode is taken out, bronzed sediments on the cathode are scraped into a product collector by a brush, and products are detected as the elementary copper via an X-ray diffractometer.

Description

technical field [0001] The invention relates to a method for recovering copper in copper-containing wastewater, in particular to a method for recovering elemental copper from copper-containing wastewater by using a microbial fuel cell. Background technique [0002] With the rapid development of modern industry, a large amount of copper-containing wastewater is produced in metal smelting, electroplating and printed circuit board industries. Taking a medium-scale plastic electroplating plant as an example, it usually discharges about 1500 t of wastewater per day, including about 840 t of copper-containing wastewater. If the copper content is 50 mg / L, the amount of copper discharged per day reaches 42 kg. Discharge of copper-containing wastewater into the environment will cause great harm to the environment. [0003] Traditional treatment methods for copper-containing wastewater include chemical precipitation, ion exchange, etc. These methods are difficult to recover copper an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/12C02F3/34
CPCC02F3/34C25C1/12H01M8/16Y02E60/50Y02P10/20
Inventor 刘维平印霞棐
Owner JIANGSU UNIV OF TECH
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