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Internal-circulation gas lift type microbial fuel cell device and application thereof

A fuel cell and airlift technology, which is applied to the field of internal circulation airlift microbial fuel cell devices, can solve problems such as the influence of physical and chemical properties, and achieve the advantages of strengthening macroscopic gas-liquid two-phase mixing and dispersion, saving energy and promoting degradation. Effect

Inactive Publication Date: 2018-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of microbial fuel cells to treat gaseous VOCs has solved the limitation of electron transfer, its mass transfer effect still needs to be further enhanced due to the influence of the physical and chemical properties of the gas itself.

Method used

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  • Internal-circulation gas lift type microbial fuel cell device and application thereof
  • Internal-circulation gas lift type microbial fuel cell device and application thereof
  • Internal-circulation gas lift type microbial fuel cell device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Reactor configuration and assembly

[0039] see figure 1 , as shown in the figure, an internal circulation airlift microbial fuel cell is used to remove volatile organic pollutants, including a carbon felt in the reaction tank and a guide tube that is rolled and fixed in the reactor, a gas distributor and a Air cathode on outer wall. The air cathode was prepared with reference to the article "Electrochemical Performance of Air Cathode Biofuel Cells" published by Wen Qing, Liu Zhimin and others in 2008.

[0040] The top of the reaction tank is provided with a water inlet, an air outlet and a sampling port. In addition, a thermometer and a pH meter can be installed. The reaction tank is in the shape of a cylinder, the height-diameter ratio is 6:1, the ratio of the diameter of the annular gas distributor to the diameter of the diversion cylinder is 0.8:1, and the cross-sectional area of ​​the diversion cylinder and the cross-sectional area of ​​the reaction ta...

Embodiment 2

[0043] Example 2: Inoculation and Start-up of Internal Circulation Airlift Microbial Fuel Cell

[0044] Under the optimal environmental factor conditions (culture solution pH=7, culture temperature 30°C), 2L of activated sludge treated with wastewater (Hangzhou Xiaoshan City Green Energy Co., Ltd.) was mixed with 8L of inorganic salt solution (phosphate buffer solution + trace elements) + vitamin solution) was added to the anode chamber of the airlift microbial fuel cell, and sodium acetate was added to make the final concentration 2g / L as a carbon source, and high-purity N was added. 2 to drive out the oxygen in the solution. When the voltage to be recorded is less than 0.05V, the carbon source in the reactor is considered to be completely consumed, and one cycle of operation is completed. After the first cycle, the anolyte was centrifuged to retain microorganisms, suspended with fresh oxygen-free inorganic salt solution, and then added to the anode chamber, and sodium aceta...

Embodiment 3

[0050] Example 3: Mineralization of typical VOCs toluene and electricity generation by airlift microbial fuel cells

[0051] After the MFC was successfully started by using sodium acetate and activated sludge, the inorganic salt solution was used as the anolyte in the system, the mixed gas of toluene and nitrogen at 200 mL / min was introduced as the carbon source, and the anaerobic environment was maintained, and the toluene concentration was detected by gas chromatography. Degradation and mineralization, use a data recorder to detect the conversion of electrical energy, where toluene removal efficiency=(inlet concentration−outlet concentration) / inlet concentration×100%.

[0052] The reactor showed weak toluene removal ability and electric energy recovery ability in the initial stage of toluene flow, because toluene had a toxic effect on electroactive bacteria using sodium acetate as carbon source, and the metabolic activity of most electroactive bacteria decreased. The number ...

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Abstract

The invention discloses an internal-circulation gas lift type microbial fuel cell device which comprises a reaction tank, a tubular anode, an air cathode and a gas distributor. The tubular anode is arranged in an inner cavity of the reaction tank, the gas distributor is arranged under the tubular anode, the air cathode is arranged on the outer wall of the lateral side of the reaction tank, and a resistor is connected between the tubular anode and the air cathode. The internal-circulation gas lift type microbial fuel cell device is simple in structure, volatile organic pollutants can be mineralized in an anaerobic mode, and a proton exchange membrane is not needed; and a carbon base material which is reasonable in price is used as an electrode and a flow guide cylinder at the same time, external added energy for stirring and mixing is not required, and the construction cost and the operation cost are saved.

Description

(1) Technical field [0001] The invention relates to an internal circulation air-lift type microbial fuel cell device and its application in mineralization and degradation of volatile organic pollutants. (2) Background technology [0002] Volatile organic compounds (VOCs) are compounds with a boiling point of 50-250°C, a saturated vapor pressure of more than 133.32Pa at room temperature, and a class of organic compounds that exist in the air in the form of steam at room temperature. There are mainly industrial sources and living sources, among which industrial sources include emissions from pharmaceutical, petrochemical, electronics, printing, manufacturing and other industries, and living sources are mainly building materials, furniture, floors, paints, etc. themselves volatilize and exhaust emissions from transportation, etc. . The flammable and explosive nature of VOCs brings potential risks to the production of enterprises. The photochemical smog, organic aerosols and ha...

Claims

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Application Information

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IPC IPC(8): H01M8/16
CPCH01M8/16Y02E60/50
Inventor 张士汉尤菊平陈建孟安妮
Owner ZHEJIANG UNIV OF TECH
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