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Microbial fuel cell and method for monitoring organic waste fermentation process

A technology of organic waste and fuel cells, applied in the direction of biochemical fuel cells, fuel cells, fuel cell additives, etc., can solve the problems of no online monitoring of organic matter in fermentation liquid, information lag, high cost, etc., and achieve the design of portable flow cells , low maintenance cost and stable operation

Active Publication Date: 2015-10-28
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the real-time online monitoring parameters of biogas fermentation are mainly biogas flow rate, pH and temperature of fermentation broth, etc. The monitoring of organic acids in fermentation broth mainly relies on off-line analysis methods such as liquid chromatography, which has disadvantages such as time-consuming, high cost, and information lag. , there is no online monitoring of organic matter in fermentation broth

Method used

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  • Microbial fuel cell and method for monitoring organic waste fermentation process
  • Microbial fuel cell and method for monitoring organic waste fermentation process
  • Microbial fuel cell and method for monitoring organic waste fermentation process

Examples

Experimental program
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Effect test

Embodiment 1

[0044] For the structure of the MFC device used, please refer to figure 1 . The MFC working conditions are optimized cathode pump flow rate of 7.28mL / min, anode flow rate of 7.74mL / min, catholyte and anolyte are both phosphate (PBS) buffer solution with a concentration of 60mmol / L (concentration of NaCl contained is 50mmol / L). Test the relationship between OECD wastewater concentration and voltage output. The concentration range is 0~7000mg COD / L. Depend on figure 2 It can be seen that there is a good linear relationship between the matrix concentration and the voltage signal in the range of 0-120mg COD / L, and when the concentration is greater than 120mg COD / L, the relationship between the two conforms to the Monod equation.

Embodiment 2

[0046] The biogas reactor used is an upflow fixed-bed anaerobic reactor (UFBAR), in which a relatively stable microbial population has been formed. The shape is cylindrical (105×450mm), made of glass. The temperature of the system was controlled at 36.5°C through the outer jacket. The filler is polyethylene material. The working volume of the reactor is 1.2L, the flow rate of the external circulation pump is 17.6L / h, and the retention time of the matrix in the UFBAR is 4min. The high flow rate of the external circulation environment is used to keep the state of the circulation liquid in the UFBAR tank and the outside of the tank as consistent as possible. This makes the external loop pH and MFC monitoring closest to the biological state in the tank. The main components of the biogas fermentation system include UFBAR, pH electrode, gas flow meter, dissolved oxygen electrode, temperature control water bath, gas-liquid separator, peristaltic pump, signal acquisition and data an...

Embodiment 3

[0049] Using urban waste as raw material, it is hydrolyzed in a hydrolysis tank first, and the UFBAR described in Example 2 is used. Both MFC and gas flow have a peak. The peak voltage of the two MFCs appears at about 7h, and the peak of gas flow appears at 10h. The initial COD of municipal waste was more than 20g / L, but it dropped to below 5g / L the next day after connecting UFBAR, and the change of VFAs in the filtrate of hydrolysis reactor was consistent with COD. During the process of waste liquefaction and hydrolysis, the online gas flow, MFC electrical signal and pH all change with the hydrolysis process. After more than 10 days of hydrolysis, the COD value of the filtrate discharged from the hydrolysis reactor dropped from 22000mg / L to 700mg / L at the beginning. According to the gas production flow curve, the gas production rate was close to zero in the last two days (200-250h). However, the voltage produced by MFC remained at 20mV, which indicated that some organic subs...

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Abstract

The invention belongs to the organic waste anaerobic fermentation monitoring field, and especially relates to a microbiological fuel cell (MFC) for monitoring the organic waste fermentation process, and a method thereof. The MFC has a jacket flow tank structure, and mainly comprises an anode chamber, a cathode chamber and a proton exchange membrane separating the anode chamber and the cathode chamber. When the MFC starts to work, an anode graphite rod and a cathode graphite rod in the electrode chamber are connected with an external circuit through leads, and acquire the voltage signals at two ends of a load resistor through data collection cards, and data are collected and processed through an electronic computer connected with the acquisition cards. An anode liquid during anaerobic monitoring liquid is an anaerobic fermentation system external circulation liquid. The above MFC system has the characteristics of stable running, real-time feedback, low maintenance cost, portable flow cell design and the like, and is an efficient biological fermenting monitoring apparatus and technology. The MFC realizes timely and effective signals and well reflects the microbial fermentation state in the fermentation monitoring process.

Description

technical field [0001] The invention belongs to the field of anaerobic fermentation monitoring of organic waste, and in particular relates to a microbial fuel cell and a method for monitoring the fermentation process of organic waste. Background technique [0002] With the worsening of energy and environmental problems, biogas produced by anaerobic fermentation of organic waste is expected to produce renewable energy while treating waste pollution, so biogas projects are developing rapidly around the world. The first step of anaerobic fermentation of organic waste is the hydrolysis process of macromolecules, which are converted into intermediate metabolites such as sugar through hydrolysis or liquefaction. Anaerobic fermentation of solid waste is a more complex biochemical process involving a variety of microorganisms , Operation negligence or material overload often lead to imbalance and inactivation of microbial flora, resulting in failure of biogas fermentation. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/16H01M8/02H01M8/04C02F3/34
CPCY02E60/527Y02E70/20Y02E60/50
Inventor 刘志丹刘京张源辉李保明
Owner CHINA AGRI UNIV