Method for electrochemically regenerating zeolite subjected to anerobic biochemical treatment and ammonia nitrogen adsorption

An electrochemical and ammonia adsorption technology, which is applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve the problems that the efficiency is easily affected by temperature, large waste liquid and waste gas are produced, and difficult to regenerate and recycle, so as to save The effect of manpower, high regeneration efficiency, and small footprint

Inactive Publication Date: 2011-09-21
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

The advantages of anaerobic biological treatment meet the requirements of new technologies for urban sewage treatment, but it still has the following disadvantages: in the anaerobic process, except for a small amount of nitrogen required by microbial synthesis cells, nitrogen can hardly be removed; Usually contains protein, which can be converted into ammonia nitrogen under the action of anaerobic bacteria, so the concentration of ammonia nitrogen in urban sewage sometimes increases after anaerobic treatment
The chemical and physical regeneration method is convenient and fast, but the cost is high, and it will produce a large amount of waste liquid and waste gas to be treated; the two-stage adsorption-biological regeneration method has low operating costs, but is slow, occupies a large area, and is easy to operate. The management is troublesome, and the efficiency is easily affected by temperature; the one-step adsorption-biological regeneration method uses a large amount of zeolite, which is difficult to regenerate and recycle, resulting in secondary pollution

Method used

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Comparison scheme
Effect test

Embodiment 1

[0035] The urban sewage from a certain place enters the EGSB reactor through the water distributor after being pretreated by grille and grit, and contacts with the highly active anaerobic sludge in the reactor from bottom to top, and the anaerobic sludge is produced by fermentative bacteria , Hydrogen-producing acetogenic bacteria, methanogenic bacteria, sulfate-reducing bacteria and other microorganisms, they degrade organic pollutants in urban sewage into CH 4 , CO 2 、H 2 O and other final products. Under the action of sulfate-reducing bacteria, SO in urban sewage 4 2- for H 2 S, the hydraulic retention time of the anaerobic reactor is 3 hours. At the same time, the supernatant from the upper three-phase separator was refluxed to the bottom of the reactor at a ratio of 1:1 to increase the rising flow rate and stirring. During the whole year of operation, the concentration of ammonia nitrogen in the effluent from the EGSB reactor was basically around 30mg / L. The perista...

Embodiment 2

[0038] The urban sewage from a certain place enters the UASB reactor through the water distributor after being pretreated by grille and grit, and contacts with the highly active anaerobic sludge in the reactor from bottom to top, and the anaerobic sludge is formed by fermentative bacteria , Hydrogen-producing acetogenic bacteria, methanogenic bacteria, sulfate-reducing bacteria and other microorganisms, they degrade organic pollutants in urban sewage into CH 4 , CO 2 、H 2 O and other final products. Under the action of sulfate-reducing bacteria, SO in urban sewage 4 2- for H 2 S, the hydraulic retention time of the anaerobic reactor is 4 hours. At the same time, the supernatant from the upper three-phase separator was refluxed to the bottom of the reactor at a ratio of 1:2 to increase the rising flow rate and stirring. During the whole year of operation, the concentration of ammonia nitrogen in the effluent from the EGSB reactor is basically around 40 mg / L, and the efflu...

Embodiment 3

[0041] The urban sewage from a certain place enters the EGSB reactor through the water distributor after being pretreated by grille and grit, and contacts with the highly active anaerobic sludge in the reactor from bottom to top, and the anaerobic sludge is produced by fermentative bacteria , Hydrogen-producing acetogenic bacteria, methanogenic bacteria, sulfate-reducing bacteria and other microorganisms, they degrade organic pollutants in urban sewage into CH 4 , CO 2 、H 2 O and other final products. Under the action of sulfate-reducing bacteria, SO in urban sewage 4 2- for H 2 S, the hydraulic retention time of the anaerobic reactor is 6 hours. At the same time, the supernatant from the upper three-phase separator was refluxed to the bottom of the reactor at a ratio of 1:1 to increase the rising flow rate and stirring. The concentration of ammonia nitrogen in the effluent from the EGSB reactor is basically around 30mg / L. Use a peristaltic pump to pump the effluent from...

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Abstract

The invention belongs to the technical field of environmental protection, and relates to a method for electrochemically regenerating zeolite subjected to anerobic biochemical treatment and ammonia nitrogen adsorption. The method comprises the following steps of: contacting pretreated town sewage with high-activity anaerobic sludge in a reactor, degrading organic pollutants in the sewage into final products such as CH4, CO2, H2O and the like by using various microbes in the anaerobic sludge, and performing electrochemical regeneration. By the method, the zeolite regeneration time is short; moreover, the ammonia nitrogen is oxidized into nitrogen and other substances in the electrochemical process, so the difficulty in treating used regenerated liquid is overcome to realize ammonia-nitrogen-free emission. Compared with bio-regeneration method and the like, the method has the advantages of small occupied area, simple operation and larger development space, and can fulfill the aims of recycling energy and saving energy.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for electrochemically regenerating zeolite after anaerobic biochemistry-absorbing ammonia nitrogen, and specifically relates to utilizing the method of electrochemical regeneration to regenerate zeolite after anaerobic biochemistry-adsorbing ammonia nitrogen to achieve the purpose of reusing energy and saving energy. energy purpose. Background technique [0002] Municipal sewage treatment often adopts the method of anaerobic biological treatment. Anaerobic biological treatment has the following characteristics: (1) construction, operation and operation are simple, and the cost of infrastructure and operation is low; (2) energy demand is low, which can save energy; (3) the treatment scale has a large elastic range, making decentralized treatment possible (4) The generation of excess sludge is less, the stability is good, the dehydration performance is good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14B01J20/34C02F1/28
Inventor 刘燕代瑞华刘翔李怀正金伟彭彬朱文君李亮
Owner FUDAN UNIV
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