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Method for improving yield and purity of methane in microbial electrolytic cell

A microbial electrolysis cell and production technology, which is applied in the direction of electrolysis organic production, electrolysis process, electrolysis components, etc., can solve the problems affecting the direct utilization of biogas, low degradation rate of organic matter, increase economic cost, etc. The effect of improving conductivity

Active Publication Date: 2019-04-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the degradation rate of organic matter in the existing method of producing methane by microbial electrolysis cells is still relatively low, and the production of methane needs to be further improved. CO in the gas produced by microbial electrolysis cells 2 The methane content is also relatively high (usually 10%~18%), while the methane content is low, resulting in low calorific value of the gas and affecting the direct utilization of biogas
The use of biogas purification process will increase economic costs and cause methane loss

Method used

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  • Method for improving yield and purity of methane in microbial electrolytic cell

Examples

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Embodiment 1

[0042] In this embodiment, wollastonite is placed on the support 7 of the microbial electrolytic cell reactor, and the specific steps are as follows:

[0043] Microbial electrolytic cell reactors in which the effluent microorganisms of the secondary sedimentation tank of a sewage treatment plant are used as inoculum to domesticate and cultivate electrode biofilms. The anode uses a carbon fiber brush with a diameter of about 5 cm, and the cathode uses a carbon fiber cloth coated with a platinum-carbon alloy catalyst (platinum-loaded area About 0.5mg / cm 2 ), the reactor capacity is 500mL, 420mL sludge hydrolyzate is added into the reactor, 8g (the dosage of wollastonite powder is 19.05g / L) wollastonite powder with a particle size of 100µm is wrapped in a 3500Da dialysis bag, and placed On the bracket 7, the distance between the dialysis bag and the bristles on the outermost edge of the anode carbon brush is 0.5cm, the applied voltage is 0.8V, and the initial pH is 7.0. Stir and ...

Embodiment 2

[0045] Embodiment 2, embodiment 3, the technique of embodiment 4 are identical with embodiment 1, and difference is, do not add wollastonite powder in the dialysis bag in embodiment 2, and the wollastonite powder in the dialysis bag in embodiment 3 is 5g (throwing The dosage is 11.95mg / L), and the wollastonite powder in the dialysis bag in Example 4 is 10g (the dosage is 23.81g / L).

Embodiment 5

[0047] The difference between this example and Example 1 is that in this example, 8g of wollastonite powder is packed into a dialysis bag and placed in the reactor without being fixed by a bracket 7, and other conditions are the same as in Example 1.

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Abstract

The invention discloses a method for improving the yield and purity of methane in a microbial electrolytic cell. According to the method, silicon-calcium stone powder is added into a microbial electrolytic cell reactor to carry out a process of preparing methane through the microbial electrolytic cell, wherein the silicon-calcium stone powder is packaged by a dialysis bag and then is placed in themicrobial electrolytic cell reactor, and the silicon-calcium stone powder is located around an anode of the microbial electrolytic cell reactor. According to the invention, the silicon-calcium stonepowder is added into the microbial electrolytic cell reactor, protons are generated by the anode of the microbial electrolytic cell to dissolve the silicon-calcium stone, and calcium ions are releasedinto the microbial electrolytic cell reactor, so that the yield and purity of methane of the microbial electrolytic cell are improved, and the problems that the yield of biogas gas in an existing microbial electrolytic cell is low and the content of carbon dioxide is high are effectively solved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for increasing the methane output and purity of a microbial electrolysis cell. Background technique [0002] Microbial electrolysis cell is a microorganism attached to the anode that oxidizes and decomposes organic matter while generating electrons and protons. Under the action of an applied voltage, the electrons are transferred to the cathode through an external circuit, and the protons are transferred to the cathode through the solution and under the action of the auxiliary potential and the catalyst. A device that combines with electrons to undergo a chemical reaction. Compared with traditional anaerobic digestion, methane production by microbial electrolytic cells has the advantages of promoting the degradation of complex organic substrates, fast degradation speed, and high degradation degree. [0003] For example, the patent literature with the ...

Claims

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Application Information

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IPC IPC(8): C25B3/04C12P5/02C25B3/25
CPCC12P5/023C25B3/25Y02E50/30
Inventor 刘和张衍姜倩倩龚林林郑志永崔敏华章湝
Owner JIANGNAN UNIV
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