Microbial electrochemical in-situ biogas desulfurization method

A microbial electrochemistry and biogas desulfurization technology, applied in the field of in-situ biogas desulfurization, can solve problems such as electrode passivation, reduce the floor space, simplify the biogas desulfurization and purification system, and facilitate the operation.

Active Publication Date: 2015-12-23
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (application number CN99807239.7) describes a method for the electrochemical oxidation of hydrogen sulfide, the product of which is sulfur particles. Although sulfur particles are good for collection, they are easy to cause electrode passivation
So far, there is no method for microbial electrochemical catalysis for in situ desulfurization of biogas

Method used

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  • Microbial electrochemical in-situ biogas desulfurization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Anode sulfur oxidation biofilm domestication

[0036]Construct a double-chamber microbial electrolytic cell, the anode is composed of two graphite plates, the size of each graphite plate electrode is 8cmx4cm, and the composition of the anode culture solution is 0.25g / LNH 4 Cl,0.5g / LNaH 2 PO 4 ,2.0g / LNaHCO 3 ,0.25g / L Acetate,5.0mMNa 2 S. The anode chamber was inoculated with Desulfuromonas, the anode potential was set to 0.3V (VsAg / AgCl) with a potentiostat, and 0.25g / LNH was added to the cathode chamber 4 Cl, 0.5g / LNaH 2 PO 4 , 2.0g / LNaHCO 3 The culture solution; observe the change of current and detect the content of sulfide and sulfate at the same time, when more than 90% of sulfide is converted into sulfate, change the solution until the sulfur conversion and current change show a periodic law, and the anodic sulfur oxidation biofilm Domestication was successful.

[0037] (2) Build electrodes

[0038] Transfer the two domesticated sulfur oxidation biofi...

Embodiment 2

[0045] The method of this example is the same as Example 1, the difference is that the applied voltage is controlled at 0.9V, and the anaerobic reactor continuously flows into the water to treat pig farm breeding wastewater, HRT=8h, and the data of the experimental group and the control group are respectively as follows:

[0046] Experimental group and control group data of table 2 embodiment 2

[0047]

[0048] It can be seen from the experimental data that the methane content of the experimental group can reach more than 80%, and the gas percentage is the volume percentage (V / V).

Embodiment 3

[0050] The method of this example is the same as Example 2, and the difference is that the anaerobic reactor directly processes the fresh leachate of the garbage transfer station. Under the continuous flow operation condition (HRT=8h), the data of the experimental group and the matched group are respectively as follows:

[0051] Experimental group and control group data of table 3 embodiment 3

[0052]

[0053] It can be seen from the experimental data that the methane content of the experimental group is much higher than that of the control group, and the hydrogen sulfide content in the biogas is lower than 10ppm, and the gas percentage is volume percentage (V / V).

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Abstract

The invention relates to a microbial electrochemical in-situ biogas desulfurization method. According to the method, sulfate is generated through microbial catalytic oxidation hydrogen sulphide with an anode electrochemical function, the sulfuretted hydrogen is prevented from being released into biogas, biogas in-situ desulfurization is completed, and the purity of methane in the biogas is improved; meanwhile, the electrons and H<+> released through sulphide oxidization are used for fixing carbon dioxide synthesis methane through cathodes, the concentration of carbon dioxide in the biogas is lowered, and synchronous in-situ desulfurization and biogas purification are achieved.

Description

technical field [0001] The invention relates to a biogas desulfurization method, in particular to a microbial electrochemical in-situ desulfurization method in an anaerobic fermentation biogas production process, which is suitable for in-situ biogas desulfurization of large, medium and small anaerobic fermentation tanks and household biogas ponds. technical background [0002] As a kind of biomass energy, biogas has high application value. The biogas produced by biomass fermentation is a kind of mixed gas, in which the mass concentration of hydrogen sulfide is generally 1-12g / m 3 , far exceeding the use regulations in the existing gas standards, the high concentration of hydrogen sulfide is the biggest limiting factor for the use of biogas as fuel gas. Hydrogen sulfide is a highly toxic gas that can corrode pipes and instruments, and will be converted into harmful gases such as sulfur dioxide during combustion, and released into the air to cause air pollution. Therefore, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/84
CPCY02A50/20
Inventor 占国强何晓红杨暖李大平
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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