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Method and reactor for removing nitrate through membrane electrolysis electrochemical hydrogen autotrophic denitrification

An autotrophic denitrification and nitrate technology, applied in chemical instruments and methods, anaerobic digestion treatment, water/sewage multi-stage treatment, etc., can solve the problem of reactor load reduction, achieve volume load increase, and avoid microbial pollution , to avoid the effect of secondary pollution

Inactive Publication Date: 2010-01-13
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The anode of the traditional anode and cathode electrochemical hydrogen autotrophic denitrification reactor without diaphragm uses carbon material as a sacrificial anode, so the anode oxygen evolution reaction limits the reactor to operate at a lower operating current (voltage), and the reactor load also greatly reduced

Method used

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  • Method and reactor for removing nitrate through membrane electrolysis electrochemical hydrogen autotrophic denitrification
  • Method and reactor for removing nitrate through membrane electrolysis electrochemical hydrogen autotrophic denitrification

Examples

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Embodiment 1

[0020] Apply 0.03mol / L of H to the anode chamber 2 SO 4 Ensure that the effluent of the cathode chamber is neutral, and the effective volume of the reactor is 3.0L. will contain NO 3 - -N 30mg / L wastewater enters the membrane electrolysis electrochemical hydrogen autotrophic membrane bioreactor from the water inlet, the applied current is 250mA, the residence time is 5h, the sludge concentration is 1000-2000mg / L, the system treats the effluent, SS is not detected out, reactor NO 3 - -N removal rate > 90%, and no NO 2 - accumulation.

Embodiment 2

[0022] The operating conditions are the same as in Example 1, except that when the applied current is 300mA, the residence time is 4h, and the sludge concentration is 1000-2000mg / L, the system treats the water, SS is not detected, and the reactor NO 3 - -N removal rate > 90%, and no NO 2 - accumulation.

Embodiment 3

[0024] The operating conditions are the same as in Example 1, except that when the applied current is 400mA, the residence time is 3h, and the sludge concentration is 1000-2000mg / L, the system treats the water, SS is not detected, and the reactor NO 3 - -N removal rate > 90%, and no NO 2 - accumulation.

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Abstract

The invention relates to a method and a reactor for removing nitrate by combining the processes of membrane electrolysis, electrochemical reduction, hydrogen autotrophic denitrification, membrane separation and the like, which belong to the application field of a water treatment technique. Specifically, a hydrogen ion exchange membrane is used to separate the positive electrode and the negative electrode of an electrolytic bath so as to form a negative electrode chamber and a positive electrode chamber, and a hydrogen autotrophic denitrifying bacteria solution is added in the negative electrode chamber. The positive electrode end and the negative electrode end are applied with direct current, the bacteria in the negative electrode chamber use the hydrogen generated by the negative electrode to perform denitrification so as to remove the nitrate, and simultaneously, the yielding water performs ultrafiltration membrane separation to perform filtration, and the ultrafiltration membrane concentrate flows back into the negative electrode chamber to improve the biomass in the reactor. The positive electrode chamber is added with H2SO4 of which the concentration range is between 0.01 and 0.5 M, H3PO4 or an acid solution thereof prepared according to arbitrary ratio. The method has the advantages of high efficiency for nitrate removal, simple operation and small floor space.

Description

technical field [0001] The invention relates to a method for removing nitrate nitrogen in water, belonging to the application field of water treatment technology. The invention proposes a method for removing nitrate in water by combining membrane electrolysis, electrochemical reduction, hydrogen autotrophic denitrification and membrane separation. Specifically, the anode and cathode of the electrolytic cell are separated by a hydrogen ion exchange membrane to form an anode chamber and a cathode chamber, a direct current is applied to the cathode and anode sections, and hydrogenated autotrophic denitrification bacteria solution is injected into the cathode chamber. The hydrogen autotrophic denitrification bacteria in the cathode chamber use the hydrogen generated at the cathode during the electrolysis process of the ion exchange membrane to perform autotrophic denitrification to reduce nitrate to nitrogen. The effluent from the electrolyzer reactor is filtered by an ultrafiltr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/461C02F3/28
Inventor 刘会娟万东锦曲久辉雷鹏举刘锐平
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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