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Microorganism electrochemical denitrification method for enhancing bio-hydrogen production

A microbial electrochemical and microbial technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of catholyte pH rise, low cathode denitrification rate, alkalinity consumption, etc. problems, to achieve the effect of increasing the denitrification rate, increasing the reduction rate and denitrification efficiency

Inactive Publication Date: 2015-04-15
JIANGNAN UNIV
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Problems solved by technology

[0003] In the BES denitrification process, due to the limitation of the anode electron generation rate, the cathode denitrification rate is low. At the same time, the denitrification process will generate alkalinity, causing the pH of the catholyte to rise; and the hydrogen produced in the anaerobic biological hydrogen production process can not only be used as a reduction To promote the process of denitrification and denitrification, along with the hydrolysis and acidification process of the carbon source in the substrate, organic acids such as acetic acid, butyric acid, propionic acid, and lactic acid will be produced, and the alkalinity generated by denitrification can also be consumed

Method used

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Examples

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Embodiment 1

[0017] Example 1 Using the sludge of Wuxi Chengbei Sewage Treatment Plant to carry out biological hydrogen production enhanced microbial electrochemical denitrification

[0018] combined with figure 1 , 2 described as follows:

[0019] Such as figure 1 As shown, the present invention uses a microbial electrochemical system as a reactor, which is composed of an anode chamber and an anode chamber, separated by a cation exchange membrane in the middle. The anode is fed by the water inlet (5), the cathode is fed by the water inlet (7) with a peristaltic pump, and the sample is taken through the water outlet (8). )superior.

[0020] First, a total volume of 550mL electrogenic nutrient solution and anaerobic sludge supernatant acclimated by electrogenic nutrient solution were inoculated into the anode chamber, wherein electrogenic nutrient solution and anaerobic sludge supernatant (containing electrogenic nutrient solution) microorganisms) with a volume ratio of 3:1, and the an...

Embodiment 2

[0021] Example 2 Using the sludge from Xuzhou Kangdafeng County Sewage Treatment Plant to carry out biological hydrogen production enhanced microbial electrochemical denitrification

[0022] The implementation method in Example 2 is similar to that of Example 1, except that the anaerobic sludge of electricity-producing microorganisms, denitrifying microorganisms and hydrogen-producing microorganisms are all obtained from Xuzhou Kangdafeng County Wastewater Treatment Plant. In addition to the experimental group in which denitrification microorganisms and hydrogen-producing microorganisms were added at the same time, there were also abiotic cathode groups in which only denitrification microorganisms were added and no microorganisms were added. After 32 days of operation, the denitrification effect of the biocathode was significantly improved compared with that of the non-biocathode, and the result was similar to that of Example 1, so no additional charts will be made here.

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Abstract

The invention discloses a microorganism electrochemical denitrification method for enhancing the bio-hydrogen production, which belongs to the field of environmental engineering and energy and chemical industry. The method is characterized in that a microorganism electrochemical system is used as a reactor, and denitrification microorganisms are added into a cathode to realize the nitrogen removal by denitrification of a biological cathode. Meanwhile, by adding the hydrogen-production microorganisms in the biological cathode, the BES (knowledge based expert system) denitrification capacity is further improved by utilizing the biological hydrogen production. The denitrification microorganisms can directly utilize the hydrogen generated by the hydrogen-production microorganisms in the biological cathode to carry out the denitrification effect; meanwhile, organic acid generated in the biological hydrogen production process can play a role in buffering pH, so that the BES denitrification rate can be further increased.

Description

technical field [0001] The invention relates to a microbial electrochemical denitrification method enhanced by biological hydrogen production, which belongs to the fields of environmental engineering and energy chemical industry. Background technique [0002] In recent years, nitrogen, as a global water pollutant, has received more and more attention for its removal. Traditional denitrification processes can be divided into three categories: physical, chemical and biological. Physical methods for denitrification mainly include ion exchange, reverse osmosis, and electrodialysis. Chemical denitrification refers to the conversion of nitrate in water to ammonia using iron salts or copper rust under alkaline or neutral pH conditions. The principle of traditional biological denitrification process is divided into three stages, including ammonification, nitrification and denitrification. The traditional denitrification process has the disadvantages of large equipment footprint, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34
Inventor 严群刘浩
Owner JIANGNAN UNIV
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