Microbial electrolysis cell integrating functions of CO2 conversion and sewage treatment

Abstract

The invention discloses a microbial electrolysis cell integrating functions of CO2 conversion and sewage treatment, which comprises a microbial electrolysis cell shell, the inside of the microbial electrolysis cell shell is provided with an anion / cation exchange membrane for dividing the microbial electrolysis cell shell into an anode chamber and a cathode chamber, the insides of the anode chamber and the cathode chamber for accommodating to-be-treated sewage are respectively provided with an anode and a cathode which are connected with an external power supply, the inside of the cathode chamber is also provided with a reference electrode for controlling the electric potential of the cathode, the upper end of the cathode chamber is provided with a cathode product outlet, and the anode chamber is communicated with the cathode chamber by an air-guide tube. In the invention, sewage is fed into the anode chamber and used as a nutrient source for the growth of various microbes, and at room temperature, the microbes carry out catabolism on organic matters in the sewage so as to achieve a wastewater treatment process. In the CO2 capturing and conversion process, CO2 released by the anode is fed into the cathode chamber by the air-guide tube, then under the catalytic action of bacteria in the cathode chamber, an effect of CO2 capturing and an effect of converting the CO2 into CH4 are achieved.

Description

technical field

[0001] The invention belongs to the interdisciplinary field of bio-battery, environment, and carbon dioxide capture and utilization, and specifically relates to a CO2-collecting 2 A microbial electrolytic cell that integrates transformation and sewage treatment. Background technique

[0002] Fossil fuels have played a huge role in the development of industry and economy in the past century. However, as the main energy source, the greenhouse gases (mainly CO 2 ) impact on climate has become increasingly prominent. CO in the global atmosphere 2 Concentrations have increased from about 280 ppm before industrialization to 379 ppm in 2005. Atmospheric CO in 2005 2 The concentration value has far exceeded the natural variation range (180-330ppm) of the concentration since 650,000 years according to ice core records. Although atmospheric CO 2 There is an interannual variability in the growth rate of the concentration, and its growth rate in the past ten years ...

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