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Integral electrochemical denitration method and reactor

An electrochemical and reactor technology, applied in the field of nitrate nitrogen removal in drinking water, can solve the problems of explosion and high hydrogen cost

Inactive Publication Date: 2004-08-18
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

However, hydrogen supplied by external sources is prone to explosion, and the cost of hydrogen is relatively high

Method used

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  • Integral electrochemical denitration method and reactor
  • Integral electrochemical denitration method and reactor
  • Integral electrochemical denitration method and reactor

Examples

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example 1

[0030] Example 1 In a reactor column with a volume of 1.477L (a plexiglass column with an inner diameter of 7.28mm and a length of 355mm), add sulfur element and calcium carbonate with a particle size of 3.0 to 4.0mm as the filling medium. It is 0.848L; the upper layer is the electrochemical section with a volume of 0.515L (excluding the volume occupied by the electrodes), and there is no filler in the electrochemical section. The raw water to be treated is prepared by sodium nitrate, and the concentration of nitrate nitrogen in the water is 30mg / L. Carry out denitrification treatment under the following conditions:

[0031] Electrode Anode: carbon rod, diameter 25mm, length 140mm.

[0032] Cathode: stainless steel cylinder, inner diameter 72.8mm, length 160mm.

[0033] Electrode spacing: 2.39cm

[0034] Current intensity: 3mA

[0035] Current density: 0.01mA / cm 2

[0036] Voltage: 1.9V

[0037] The maximum denitrification load in the electrochemical section: ...

example 2

[0044] Example 2 In a reactor column with a volume of 1.469L (a plexiglass column with an inner diameter of 7.28mm and a length of 353mm), the sulfur element with a particle size of 3.0 to 4.0mm is added as a filling medium, and the filling volume of the medium is 0.839L; the upper layer is an electrochemical section, and the volume It is 0.515L (excluding the volume occupied by the electrodes); there is no packing in the electrochemical section. The raw water to be treated is prepared by potassium nitrate, and the concentration of nitrate nitrogen in the water is 30mg / L. Carry out denitrification treatment under the following conditions:

[0045] Electrode Anode: carbon rod, diameter 25mm, length 140mm.

[0046] Cathode: stainless steel cylinder, inner diameter 72.8mm, length 160mm.

[0047] Electrode spacing: 2.39cm

[0048] Current intensity: 3.4mA

[0049] Current density: 0.011mA / cm 2

[0050] Voltage: 2.0V

[0051] The maximum denitrification load in the e...

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Abstract

The present invention provides one kind of method of elimianting nitrate nitrogen from drinking water to combine two chemical processes of sulfuric autotrophic denitrification and electrochemical autotrophic denitrification. One reactor to eliminate nitrate nitrogen from water is also provided, and it includes sulfuric autotrophic denitrification unit and electrochemical autotrophic denitrifcation unit connected serially together. The present invention has a denitrification efficiency as high as 98% and the drinking water after treated by means of the method and reactor has nitrite nitrogen content lower than 0.01 mg / L and no secondary pollution.

Description

technical field [0001] The invention relates to a method and a reactor for removing nitrate nitrogen in drinking water, in particular to a method for removing nitrate nitrogen in drinking water by combining the sulfur autotrophic denitrification process with the autotrophic denitrification process of electrochemical hydrogen production method, and realize the optimization and integration of both processes in the same reactor. Background technique [0002] The removal of nitrate nitrogen in water mainly includes ion exchange method, membrane separation method, biological denitrification method and so on. Biological denitrification is considered to be the most promising method for drinking water denitrification due to its simple process and high efficiency. Since drinking water lacks a source of nutrients, when denitrification is used to remove nitrate from water, sufficient nutrients need to be added in some way. Therefore, biological denitrification is divided into heterot...

Claims

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Application Information

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IPC IPC(8): C02F1/46C02F1/461C02F1/58C02F3/00C02F3/34
Inventor 曲久辉王海燕雷鹏举刘会娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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