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Method for improving power generation performance of buffer-less microbial fuel cell (BLMFC)

A fuel cell and electrical performance technology, applied in the field of environmental biology, can solve the problems of limited buffer capacity and low concentration

Inactive Publication Date: 2017-09-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during a single run cycle, the HCO 3 - It is gradually accumulated with the occurrence of anodic reaction, so the concentration is low and the buffer capacity is limited

Method used

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  • Method for improving power generation performance of buffer-less microbial fuel cell (BLMFC)

Examples

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Effect test

example 1

[0014] Place the graphite felt anode and the activated carbon air cathode in a 28mL MFC reactor, use the sludge from the anaerobic pool of the sewage treatment plant as the inoculum, add PBS buffer solution (50mM) containing 1g / L sodium acetate, and connect an external resistance of 500Ω , inoculate at room temperature, and the reactor starts up successfully when the power generation of the MFC system is greater than 100mV. Suck out the sludge, add NaCl solution (50mM) containing 1g / L sodium acetate as anolyte, connect external resistance of 500Ω, and inoculate at room temperature. The anolyte is reused at a volume ratio of 30%, that is, at the end of each power generation cycle, 30% of the volume of the anolyte is taken out and re-added to the MFC reactor, followed by adding a high-concentration sodium acetate solution and using NaCl solution (50mM) Fill the MFC reactor fully and connect the external circuit to generate electricity. After 5 cycles of reuse, the pH value of t...

example 2

[0016] Place the graphite felt anode and the activated carbon air cathode in a 1L MFC reactor, use the sludge from the anaerobic pool of the sewage treatment plant as the inoculum, add PBS buffer solution (50mM) containing 1g / L sodium acetate, and connect an external resistance of 500Ω , inoculate at room temperature, and the reactor starts up successfully when the power generation of the MFC system is greater than 100mV. The sludge was sucked out, and a NaCl solution (50mM) containing 1g / L glucose was pumped in by a peristaltic pump as the anolyte, connected to an external resistance of 500Ω, and operated continuously at room temperature. The effluent is directly pumped into the reactor with a peristaltic pump so that the volume of recycled anolyte in the reactor accounts for 50% of the total volume of the reactor, and an external circuit is connected to generate electricity. After 6 days of operation, the pH value of the anolyte fluctuates around 7.6, and the HCO 3 - The c...

example 3

[0018] The carbon fiber brush anode and the Pt / C modified carbon cloth air cathode were placed in a 5L MFC reactor, and the anaerobic pool sludge of the sewage treatment plant was used as the inoculum, and a phosphate buffer solution (50mM) containing 1g / L sodium acetate was added , an external 500Ω external resistance, inoculation at room temperature, when the power generation of the MFC system is greater than 100mV, the reactor starts successfully. Suck out the sludge and pump it into domestic sewage with a peristaltic pump (COD is 400mg·L -1 ) as the anolyte, connected to an external resistance of 500Ω, and operated continuously at room temperature. The effluent is directly pumped into the reactor with a peristaltic pump so that the volume of recycled anolyte in the reactor accounts for 40% of the total volume of the reactor, and an external circuit is connected to generate electricity. After 8 days of operation, the pH value of the anolyte fluctuated around 8.3, and the H...

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Abstract

According to a method for improving power generation performance of a buffer-less microbial fuel cell (BLMFC), the accumulation concentration of HCO<3><-> in a positive electrode liquid is increased by recycling outgoing water of the BLMFC, the self-buffer capability of a BLMFC system is improved, a phenomenon that the positive electrode liquid is acidulated is thoroughly eliminated, and finally, the power generation stability and the power density of the BLMFC system are remarkably improved. The method is simple to operate, the power generation improvement effect of the BLMFC system is remarkable, and the MFC can have application value in aspects of handling waste water and solid waste.

Description

technical field [0001] The invention relates to a method for strengthening the electricity production performance of a non-buffer microbial fuel cell (BLMFC), which belongs to the field of environmental biotechnology. Background technique [0002] Microbial fuel cell (MFC) is a sewage treatment technology with great development potential, which can recover electrical energy while degrading organic matter. Therefore, the research on the MFC system has naturally become a research hotspot in the field of environment. At present, during the operation of the small-scale MFC system in the laboratory, it is generally necessary to add PBS buffer or NaHCO 3 The solution is used to maintain a certain ionic strength and pH value to ensure the efficient and stable operation of the system. However, the large-scale application of MFC in the field of sewage treatment in the future will need to be carried out under unbuffered conditions, because the addition of buffer salts will significa...

Claims

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Application Information

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IPC IPC(8): H01M8/16C02F1/46
CPCC02F1/46H01M8/16Y02E60/50
Inventor 任月萍
Owner JIANGNAN UNIV
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