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A kind of bioelectrochemical reaction device and gas purification method

A chemical reaction and bioelectric technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of increasing the structural complexity and operating cost of the gas purification system, and there is no hydrogen sulfide bioelectrochemical system, purification, etc.

Active Publication Date: 2022-07-01
国科学技术大学苏州高等研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of bioelectrochemical reaction device and gas purification method
  • A kind of bioelectrochemical reaction device and gas purification method
  • A kind of bioelectrochemical reaction device and gas purification method

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Experimental program
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Effect test

Embodiment 1

[0056] use figure 1 In the device shown, sodium sulfide is used instead of hydrogen sulfide as the sulfur source, and sodium bicarbonate in the culture medium and carbon dioxide in the headspace are used as the carbon source to perform simultaneous sulfur ion oxidation and recovery of elemental sulfur and carbon dioxide reduction to produce methane.

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

Embodiment 2

[0064] High-purity nitrogen gas and pure carbon dioxide gas (purity of 99.95%) were used to fully aerate the headspace of the anode and cathode chambers, respectively, and then 1% H 2 S(99%N 2 ) gas is continuously fed into the anode chamber at a rate of 1.0 mL / min (the anolyte is a ferrous sulfate solution, the concentration of the ferrous sulfate solution is 0.2 mol / L, and the pH of the anolyte is 1.0), and 0.1 M The sodium hydroxide solution is used as the exhaust gas absorption liquid; inoculate the hydrogenophilic methanogen in the cathode chamber (the medium solution is the standard DSMZ 141 medium after removing the zymoin, peptone and sodium acetate, the pH value of the medium solution is 8.0 ± 0.2, the final concentration of 100mM diglyceride is used as buffer salt in the medium solution), the circuit is connected, and the entire bioelectrochemical reaction device is placed at 37 V under the condition that the applied voltage ensures that the cathode potential is -0.7...

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 the cathode chamber, and then 1% H 2 S(99%N 2 ) gas is continuously fed into the anode chamber at a rate of 1.0 mL / min (the anolyte is a ferrous sulfate solution, the concentration of the ferrous sulfate solution is 0.2 mol / L, and the pH of the anolyte is 1.0), and 0.1 M The sodium hydroxide solution is used as the exhaust gas absorption liquid; inoculate the hydrogenophilic methanogen in the cathode chamber (the medium solution is the standard DSMZ 141 medium, the medium obtained after removing the yeast, peptone and sodium acetate, the pH value of the medium solution is 8.0 ± 0.2, using the final concentration of 100mM DDP in the medium solution as a buffer salt), connecting the circuit, and applying the voltage to ensure that the cathode potential is -0.7V, the entire bioe...

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Abstract

The invention belongs to the technical field of bioelectrochemical gas purification and sulfur resource recovery, and in particular relates to a bioelectrochemical reaction device and a gas purification method. In the invention, a medium substance with redox activity is added into the anode chamber, and the anode is used as an electron acceptor to indirectly oxidize sulfur ions to generate recyclable elemental sulfur particles; The biocathode of methanogens reduces carbon dioxide to methane, thereby realizing the removal of high-concentration carbon dioxide and increasing the methane content in the mixed gas. The invention uses electric energy as a driving force, can simultaneously realize the removal of hydrogen sulfide, the recovery of elemental sulfur and the reduction of carbon dioxide to produce methane, and is suitable for the upgrading and purification of anaerobic digestion of biogas, natural gas and industrial waste gas containing hydrogen sulfide.

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 because of its abundant reserves, convenient extraction and efficient combustion. But in addition to methane, the presence of carbon dioxide and a small amount of hydrogen sulfide in natural gas brings great inconvenience to its direct utilization. In addition, biological anaerobic fermentation is a relatively mature technology for degrading organic waste and energy recovery. The main component of its main product biogas is also methane gas (about 60-70%), which contains The large amount of energy makes it promising as an important renewable energy alternative to natural gas. Similar to natural ...

Claims

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Application Information

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Patent Type & Authority Patents(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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