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Bioelectrochemical reaction device and gas purification method

A technology of chemical reaction and bioelectricity, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of increasing the structure complexity and operating cost of the gas purification system, purification, and hydrogen sulfide bioelectrochemical system.

Active Publication Date: 2021-03-30
国科学技术大学苏州高等研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology cannot be directly used for natural gas or biogas purification due to the presence of corrosive hydrogen sulfide gas components
Therefore, it is often necessary to remove hydrogen sulfide through pretreatment methods such as absorption and adsorption, but this undoubtedly increases the structural complexity and operating costs of the gas purification system
At present, there is no bioelectrochemical system for the purification of mixed gas containing methane that can simultaneously realize the removal of hydrogen sulfide and the reduction of carbon dioxide

Method used

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  • Bioelectrochemical reaction device and gas purification method
  • Bioelectrochemical reaction device and gas purification method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] use figure 1 The shown device uses sodium sulfide instead of hydrogen sulfide as the sulfur source, uses sodium bicarbonate in the culture medium and carbon dioxide in the headspace as the carbon source, and performs the synchronous oxidation of sulfur ions to recover elemental sulfur and the reduction of carbon dioxide to produce methane.

[0057] Use high-purity nitrogen (purity 99.999%) and nitrogen / carbon dioxide mixture (the volume ratio of nitrogen and carbon dioxide in the mixture is 80:20) to fully aerate the headspace of the anode chamber and cathode chamber, and then in the anode chamber Add the sulfur source (the anolyte is a ferrous sulfate solution, the concentration of the ferrous sulfate solution is 0.2mol / L, and the pH value of the anolyte is 1.0), inoculate the hydrogenophilic methanogen in the cathode chamber (cultivate The base solution is the standard DSMZ 141 medium obtained after removing yeastin, peptone and sodium acetate, the pH value of the med...

Embodiment 2

[0064] The headspace of the anode chamber and cathode chamber was fully aerated with high-purity nitrogen gas and pure carbon dioxide gas (purity 99.95%), and then 1% H 2 S (99% N 2 ) gas is continuously passed into the anode chamber at a rate of 1.0mL / min (the anolyte is a ferrous sulfate solution, the concentration of the ferrous sulfate solution is 0.2mol / L, and the pH value of the anolyte is 1.0), and a 0.1M The sodium hydroxide solution is used as the tail gas absorption solution; inoculate the hydrogenophilic methanogens in the cathode chamber (the medium solution is the standard DSMZ 141 medium obtained after removing zymosin, peptone and sodium acetate, the pH value of the medium solution 8.0 ± 0.2, the medium solution uses a final concentration of 100mM glyceryl dipeptide as a buffer salt), connected to the circuit, under the condition that the applied voltage ensures that the cathode potential is -0.7V, the whole bioelectrochemical reaction device is placed at 37 In...

Embodiment 3

[0072] High-purity nitrogen and carbon dioxide / methane mixed gas (the volume ratio of carbon dioxide and methane in the mixed gas is 40:60) were used to fully aerate the headspace of the anode chamber and cathode chamber, and then 1% H 2 S (99% N 2 ) gas is continuously passed into the anode chamber at a rate of 1.0mL / min (the anolyte is a ferrous sulfate solution, the concentration of the ferrous sulfate solution is 0.2mol / L, and the pH value of the anolyte is 1.0), and a 0.1M The sodium hydroxide solution is used as the tail gas absorption solution; inoculate the hydrogenophilic methanogens in the cathode chamber (the medium solution is the standard DSMZ 141 medium obtained after removing zymosin, peptone and sodium acetate, the pH value of the medium solution 8.0 ± 0.2, the final concentration of 100mM glycerol dipeptide is used as a buffer salt in the medium solution), the circuit is connected, and the applied voltage ensures that the cathode potential is -0.7V, and the en...

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Abstract

The invention belongs to the technical field of bioelectrochemical gas purification and sulfur resource recovery, and particularly relates to a bioelectrochemical reaction device and a gas purification method. According to the invention, a medium substance with redox activity is added into an anode chamber, and an anode is used as an electron acceptor to indirectly oxidize sulfur ions to generaterecoverable elemental sulfur particles; and meanwhile, under the condition that a direct-current power supply provides external voltage, carbon dioxide is reduced into methane by utilizing a biological cathode enriched with hydrogenophilic methanogens, so that the removal of the high-concentration carbon dioxide is realized, and the content of the methane in the mixed gas is increased. Electric energy is used as driving force, hydrogen sulfide removal, elemental sulfur recovery and carbon dioxide reduction methane production can be synchronously achieved, and the device and method are suitablefor upgrading and purifying anaerobic digestion biogas, natural gas and hydrogen sulfide-containing industrial waste gas.

Description

technical field [0001] The invention relates to the technical field of bioelectrochemical gas purification and sulfur resource recovery, in particular to a bioelectrochemical reaction device and a gas purification method. Background technique [0002] Natural gas is an energy gas with methane as the main component. It has become an important form of energy supply in the world today due to its advantages such as abundant reserves, convenient mining and efficient combustion. However, in addition to methane, the presence of carbon dioxide and a small amount of hydrogen sulfide in natural gas has brought great inconvenience to its direct utilization. In addition, as a relatively mature technology for the degradation of organic waste and energy recovery, bioanaerobic fermentation is the main component of the main product biogas is also methane gas (content is about 60-70%), which contains A large amount of energy makes it expected to become an important renewable energy alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32C25B1/01C25B3/26C25B3/03C25B9/19
CPCB01D53/326C25B1/00B01D2257/304B01D2257/504B01D2256/245Y02P20/151
Inventor 李文卫付贤钟李杰柳后起
Owner 国科学技术大学苏州高等研究院
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