Microbial fuel cell for processing acid copper-containing waste water of mine, and copper recycling method

A fuel cell and microorganism technology, which is applied in the fields of biochemical fuel cells, water pollutants, water/sewage treatment, etc., can solve the problems of high energy consumption, failure to mention heavy metal recovery, and difficulty in directly recovering elemental copper.

Inactive Publication Date: 2018-04-20
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only traces of rare earth ions and ammonium sulfate in wastewater can be recycled, and the recovery of heavy metals cannot be mentioned.
[0008] In the existing methods for treating acidic copper-containing wastewater from mines, there are problems such as difficulty in directly recovering elemental copper, high energy consumption, or being easily affected by the weather, which also prompts people to continuously explore new technologies and methods. Microbial fuel cells (MFCs) ) is applied to the treatment of acidic copper-containing wastewater in mines, which has the advantages of environmental protection and energy saving, and is an environmentally friendly new method for wastewater treatment

Method used

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  • Microbial fuel cell for processing acid copper-containing waste water of mine, and copper recycling method
  • Microbial fuel cell for processing acid copper-containing waste water of mine, and copper recycling method
  • Microbial fuel cell for processing acid copper-containing waste water of mine, and copper recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Two sets of MFC devices were selected, the effective volume was 100mL, and the volume ratio of the anode bacteria to the substrate was 1:3. The first group of MFC1 is added to stir at a speed of 500r / min, and the speed of the other group of MFC2 is 0. Using the steady-state discharge method, the power density curve is obtained by calculation and drawing (see figure 1 ). After running for 30 days, take out the cathode, collect the cathode reduction product, and utilize XRD diffractometer to detect the cathode product (see figure 2 ), the morphology of the cathode product is as image 3 shown. The power generation performance and wastewater treatment effect of the two groups of batteries are compared as shown in Table 1.

[0043] It can be seen from Table 1 that when the speed increases from 0 to 500r / min, the maximum open circuit voltage of MFC increases from 503mV to 522mV, and the maximum power density increases from 225mW / m 2 increased to 400mW / m 2 , the power ...

Embodiment 2

[0047] This example is the same as the first group of MFC1 in Example 1, except that the volume ratio of the anode bacteria species to the substrate is 1:1. Under these conditions, the open circuit voltage of the microbial fuel cell is 610mV, and the maximum power density is 580.8mW / m 2 , the anode COD removal rate is 38.8%, and the cathode Cu 2+ The removal rate was 92.2%.

Embodiment 3

[0049] The method of this example is the same as Example 2, except that the effective volume of the device is 250mL. Under these conditions, the open circuit voltage of the microbial fuel cell is 538mV, and the maximum power density is 304.2mW / m 2 , the anode COD removal rate is 32.1%, and the cathode Cu 2+ The removal rate is 89.8%, and the cathodic reduction product is copper.

[0050] Table 1 Microbial fuel cell power generation performance and wastewater treatment effect

[0051]

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Abstract

The invention discloses a microbial fuel cell for processing acid copper-containing waste water of mine, and a copper recycling method. Processing of the acid copper-containing waste water of mine bythe microbial fuel cell comprises the following three steps (1) enrichment of a positive electrode electrochemical active microorganism: dewatered sludge is a positive electrode inoculum, and a culture domestication liquid taking sucrose as the main part is added for performing domestication for seven days to obtain a positive electrode culture; the main components of a positive electrode substrate comprise residual sludge, glucose and the like; and the volume ratio of the positive electrode culture to the substrate is 1:1 to 1:4; (2) establishment of an MFC system: the effective volume of theMFC is 100-250mL; the spacing between a positive electrode carbon brush and a negative electrode carbon brush is 4-6cm; and after the output voltage of the MFC reaches 400-600mV, a positive electrodestirring apparatus is started at the rotary speed of 450-550r / min and at the maximum power density of 580.8mW / m<2>; and (3) processing of the acid copper-containing waste water of mine and copper recycling in a negative electrode room: a negative electrode is taken out after operation for 25-30 days; a negative electrode reduction product is collected, and detection proves that the product is elementary copper; after the reaction, the negative electrode liquid is 6.5-6.9 in pH value; and negative electrode Cu<2+> removal ratio is 92.2%.

Description

technical field [0001] The invention relates to the fields of mine ecological environment management, heavy metal wastewater treatment and resource recycling. In particular, it relates to a microbial fuel cell for treating mine acidic copper-containing wastewater and a copper recovery method. Background technique [0002] With the rapid development of water resources in all aspects of the world today, there is a lot of demand and utilization. However, for the massive discharge of untreated or unqualified wastewater, it has caused great damage to human beings who are not rich in fresh water resources. Especially with the development of industrialization, more and more water resources are polluted, the aquatic ecosystem is greatly damaged, the utilization value of water resources is reduced, and the functions are also lost, and the resulting A series of problems unfavorable to water resources. Mineral resources are important resources for the development of human society. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/16C02F3/34C02F103/10C02F101/20
CPCC02F3/005C02F2101/20C02F2103/10C02F2201/46115H01M8/16Y02E60/50Y02P70/50
Inventor 刘维平朱美月潘璐璐吴丹菁梁国斌陈娴路娟娟
Owner JIANGSU UNIV OF TECH
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