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A denitrification method coupled with ion exchange-zero-valent iron-denitrifying bacteria

A denitrifying bacteria, coupled denitrification technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of low nitrate removal rate, requiring days or even weeks The time and pH of the effluent are high, and the removal rate is fast, the conditions are easy to control, and there is no secondary pollution.

Inactive Publication Date: 2015-11-04
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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Problems solved by technology

However, in practical applications, there are still some problems to be solved. One is that the reaction usually takes days or even weeks to complete, and the removal rate of nitrate is too low; the other is that a large amount of OH is released during the corrosion process of zero-valent iron. - Ions, causing the pH of the system effluent to be too high

Method used

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  • A denitrification method coupled with ion exchange-zero-valent iron-denitrifying bacteria
  • A denitrification method coupled with ion exchange-zero-valent iron-denitrifying bacteria
  • A denitrification method coupled with ion exchange-zero-valent iron-denitrifying bacteria

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Embodiment 1

[0026] A coupling denitrification method of ion exchange-zero-valent iron-denitrifying bacteria, using ion-exchange resin to quickly remove nitrate, and using zero-valent iron and denitrifying bacteria to complete biological denitrification and ion-exchange resin regeneration of water nitrate Harmless reduction, the ion exchange resin is an anion exchange resin with nitrate adsorption capacity, the zero-valent iron is 300 mesh reducing iron powder, and the denitrifying bacteria are facultative anaerobic bacteria that use hydrogen to grow autotrophically under anaerobic conditions. Denitrifying bacteria, the steps are as follows:

[0027] 1) The volume of raw water to be treated is 1L, and the pH value of the water to be reacted is adjusted to 7.0 with 1 mol / L hydrochloric acid solution;

[0028] 2) The nitrate content in the water body was determined to be 50 mg / L (calculated as N) by ultraviolet spectrophotometry;

[0029] 3) Select 717 anion exchange resin with an exchange ...

Embodiment 2

[0036] A coupling denitrification method of ion exchange-zero-valent iron-denitrifying bacteria, using ion-exchange resin to quickly remove nitrate, and using zero-valent iron and denitrifying bacteria to complete biological denitrification and ion-exchange resin regeneration of water nitrate Harmless reduction, the ion exchange resin is an anion exchange resin with nitrate adsorption capacity, the zero-valent iron is 100 mesh reducing iron powder, and the denitrifying bacteria are facultative anaerobic bacteria that use hydrogen to grow autotrophically under anaerobic conditions. Denitrifying bacteria, the steps are as follows:

[0037] 1) The volume of raw water to be treated is 1.5L, and the pH value of the water to be reacted is adjusted to 7.0 with 1 mol / L hydrochloric acid solution;

[0038] 2) The nitrate content in the water body was determined to be 65 mg / L (calculated as N) by ultraviolet spectrophotometry;

[0039] 3) Select 717 anion exchange resin with an exchang...

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Abstract

The invention provides an ion exchange-zero-valent iron-denitrifying bacteria coupling denitrification method. The ion exchange-zero-valent iron-denitrifying bacteria coupling denitrification method is characterized in that ion exchange resin is used for rapidly removing nitrate, and meanwhile, zero-valent iron and denitrifying bacteria are used for completing the biological denitrification and the harmless reduction of nitrate in water in which the ion exchange resin is regenerated, wherein the ion exchange resin is anion exchange resin with nitrate adsorption capacity, the zero-valent iron is 100-300 meshes of reductive iron powder, and the denitrifying bacteria are facultative anaerobic denitrifying bacteria which grow in an autotrophic manner by using hydrogen under an anaerobic condition. The ion exchange-zero-valent iron-denitrifying bacteria coupling denitrification method has the advantages that the ion exchange and the iron-bacteria coupling denitrification are optimized and combined, so that the reaction time is short in an iron-bacteria coupling process, the generation of toxic byproducts such as ammonium salt is inhibited, and meanwhile, the problems that the ion exchange denitrification is incomplete, lots of alkali liquor is needed for regenerating the ion exchange resin and the like are solved; the reaction and operation process is simple, conditions are easy to control, the removal speed of pollutants is high, and the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to an ion exchange-zero-valent iron-denitrifying bacteria coupling denitrification method. Background technique [0002] Autotrophic denitrification, especially hydrogen-supported denitrification, is considered to be an ideal denitrification method because of its clean product and little impact on the water environment. Therefore, with hydrogen-supported denitrification as the core, the development of combined biological denitrification technology has become a research hotspot at home and abroad. The core is to find a suitable hydrogen supply method for hydrogen-supported denitrification bacteria. And combine it with autotrophic denitrifying bacteria to build a nitrogen removal composite system. However, the solubility of hydrogen in water is extremely low, and the use of an external hydrogen source will greatly reduce the denitrification reaction rate....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 安毅张克强董琪
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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