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Method and reactor for removing nitrate through catalytic electrochemical biological hydrogen autotrophic denitrification

An autotrophic denitrification and nitrate technology, applied in chemical instruments and methods, electrochemical water/sewage treatment, biological water/sewage treatment, etc., can solve problems such as low current efficiency, and achieve high current efficiency and biological treatment units. Simplified, easy-to-use effects

Active 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

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Problems solved by technology

Among them, the electrochemical reduction method is a denitrification method developed in recent years. The electrode with catalytic activity is used as the cathode. Under the action of direct current, electrons are used as the reducing agent to directly carry out the catalytic reduction reaction on the surface of the electrode without adding Any agent, fast reaction speed, simple process, easy to operate, but low current efficiency

Method used

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  • Method and reactor for removing nitrate through catalytic electrochemical biological hydrogen autotrophic denitrification
  • Method and reactor for removing nitrate through catalytic electrochemical biological hydrogen autotrophic denitrification

Examples

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Embodiment 1

[0020] The effective volume of the cathode chamber of the reactor is 400mL. Surface modification of copper electrode with self-made catalytic electrode Pd (galvanostatic electrodeposition, PdCl 2 Concentration: 0.005mol / L; NH 4 Cl concentration: 0.1mol / L; deposition time: 15min; pH: 0.3) as the cathode, keep the hydrogen autotrophic denitrification sludge concentration of 700mg / L in the cathode chamber, apply a current of 50mA, when NO 3 - The initial concentration is 100mg / L, after 3.5h of reaction, the reactor NO 3 - -N removal rate > 95%, and no NO 2 - and NH 4 + accumulation.

Embodiment 2

[0022] The effective volume of the cathode chamber of the reactor is 400mL. Surface modification of copper electrode with self-made catalytic electrode Pd (galvanostatic electrodeposition, PdCl 2 Concentration: 0.005mol / L; NH 4 Cl concentration: 0.1mol / L; deposition time: 15min; pH: 0.3) as the cathode, keep the concentration of hydrogen autotrophic denitrification sludge in the cathode chamber at 1000mg / L, apply a current of 100mA, when NO 3 - The initial concentration is 100mg / L, after 2.5h of reaction, the reactor NO 3 - -N removal rate > 95%, and no NO 2 - and NH 4 + accumulation.

Embodiment 3

[0024] The effective volume of the cathode chamber of the reactor is 400mL. Surface modification of copper electrode with self-made catalytic electrode Pd (galvanostatic electrodeposition, PdCl 2 Concentration: 0.005mol / L; NH 4 Cl concentration: 0.1mol / L; deposition time: 15min; pH: 0.3) as the cathode, keep the concentration of hydrogen autotrophic denitrification sludge in the cathode chamber at 1000mg / L, apply a current of 50mA, when NO 3 - The initial concentration is 70mg / L, after 2.0h of reaction, the reactor NO 3 - -N removal rate > 95%, and no NO 2 - and NH 4 + accumulation.

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Abstract

The invention relates to a method and a reactor for removing nitrate by combining the processes of electro-catalytic reduction and electrochemical hydrogen autotrophic denitrification. Specifically, an electrode with catalytic activity is adopted as the negative electrode, and simultaneously denitrifying bacteria are contacted with the negative electrode directly. Under an electro-reduction condition with high selectivity, the nitrate in water can obtain electrons and is reduced in the process of electrode reaction, and simultaneously, the hydrogen evolution reaction happens on the surface ofthe electrode, part of the hydrogen participates in the reduction reaction of nitrate radicals on the surface of the electrode directly, while the other part of the hydrogen is used by the autotrophic denitrifying bacteria and the nitrate in the water is removed through the autotrophic denitrification. Thus, the current efficiency is improved, and a biological processing unit is simplified. Besides, the yielding water from a reactive tank is filtered by an ultrafiltration unit to remove microorganisms in the water, and simultaneously the ultrafiltration concentrate flows back to a biochemicalreaction chamber. The method and the reactor belong to the application field of a water treatment technique, and have the advantages of high current efficiency, quick reaction, simplified biological processing unit, easy operation and small floor area.

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 present invention proposes a method and a reactor for combining electrocatalysis and electrochemical hydrogen autotrophic denitrification process to remove nitrate in water. Specifically, the electrode with catalytic activity is used as the cathode, and the electrode is used on the one hand through the electrochemical process. The chemical process directly catalyzes the reduction of nitrate, and on the other hand, the hydrogen generated by the catalytic electrode is used for the growth of hydrogen autotrophic denitrifying bacteria, thereby reducing nitrate. technical background [0002] Due to the development of modern agriculture and the widespread use of large amounts of synthetic nitrogen fertilizers, nitrate has become one of the most ubiquitous groundwater pollutants. my country is a large agricultural co...

Claims

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Application Information

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IPC IPC(8): C02F1/46C02F3/00
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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