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Method and device for reducing nitrate radicals in acid solution

A nitrate and acid solution technology, applied in chemical instruments and methods, reduced water/sewage treatment, water pollutants, etc., can solve the problem of catalyst deactivation, catalytic reaction time, reduction products that need to be reprocessed, and long catalytic reaction time and other problems, to achieve high industrial application value, no secondary pollution formation, fast response effect

Active Publication Date: 2020-08-04
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chemical reduction technology has many disadvantages, such as the catalyst is easily deactivated, the catalytic reaction time is long, and toxic gas is produced, and the electrode plate is not resistant to corrosion, especially acidic wastewater.
[0003] CN107519868A discloses a nano-palladium-silver alloy catalyst material for catalytic reduction of nitrate in water, and applies the material in the reduction process of nitrate, using nano-metal particles as a catalyst, and formic acid as a reducing agent to improve the reaction rate and Selectivity, but the catalyst is easily deactivated and the catalytic reaction time is long, and toxic gases will be generated during the reaction
[0005] CN107640814A discloses a method for in-situ reduction and degradation of nitrate in water. The method uses metal sodium borohydride or potassium borohydride and a metal alkali solution to reduce the nitrate in the solution to ammonia, but the ammonia produced by the method still needs to be reprocessed
[0006] In summary, the existing methods for treating nitrate in wastewater have various problems such as easy deactivation of catalysts, easy corrosion of electrode plates, or reprocessing of reduced products.

Method used

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  • Method and device for reducing nitrate radicals in acid solution
  • Method and device for reducing nitrate radicals in acid solution
  • Method and device for reducing nitrate radicals in acid solution

Examples

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Effect test

Embodiment 1

[0071] The composition of the acid solution containing nitrate in this embodiment includes: the content of nitrate is 50000 mg / L, the COD value is 5000 mg / L, and the mass content of sulfuric acid is 5%.

[0072] The present embodiment provides a kind of reduction method of nitrate in acid solution, described method comprises the steps:

[0073] (1) Send the acid solution containing nitrate into the reduction device, and carry out evaporation and concentration treatment at 70°C under normal pressure to obtain a concentrated solution with a hydrogen ion molar concentration of 2mol / L;

[0074] (2) adding glucose to the concentrated solution, the quality of glucose accounts for 10% of the total mass of the concentrated solution, and performing a pre-reduction reaction at 10° C. for 10 minutes to obtain a pre-reduction solution containing nitrite;

[0075] (3) In the pre-reduction solution, add concentrated sulfuric acid until the molar concentration of hydrogen ions in the pre-red...

Embodiment 2

[0086] The nitrate-containing acid solution treated in this embodiment is: nitrate-containing fluosilicic acid aqueous solution, and its composition includes: the nitrate content is 25000 mg / L, and the mass content of fluosilicic acid is 10%.

[0087] The present embodiment provides a kind of reduction method of nitrate in acid solution, described method comprises the steps:

[0088] (1) Send the acid solution containing nitrate into the reduction device, and carry out evaporation and concentration treatment at 60°C under normal pressure to obtain a concentrated solution with a hydrogen ion molar concentration of 3mol / L;

[0089] (2) adding ascorbic acid to the concentrated solution, the quality of ascorbic acid accounts for 2% of the total mass of the concentrated solution, and performing a pre-reduction reaction at 20° C. for 20 minutes to obtain a pre-reduction solution containing nitrite;

[0090] (3) In the pre-reduction solution, adding high concentration of fluosilicic ...

Embodiment 3

[0093] The acid solution containing nitrate radicals handled by the present embodiment is the same as that of Embodiment 2.

[0094] This embodiment provides a method for reducing nitrate in an acid solution. The method is the same as in Example 2 except that "ascorbic acid" in step (2) is replaced by "isopropanol".

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Abstract

The invention provides a method for reducing nitrate radicals in an acid solution. According to the method, an acid solution containing the nitrate radicals is subjected to pre-reduction, the nitrateradicals are reduced to be in a nitrite radical state, then catalytic reduction is carried out, the nitrite radicals are directly reduced to be nitrogen, nitrate radical ions in the acid solution areremoved, and a generated gas is low in nitrogen oxide content, free of pollution to air and harmless to a human body; meanwhile, the method has the advantages of simple operation conditions and process, the invention further provides a device for reducing the nitrate radicals in the acid solution, and the device is simple and easy to operate and has great industrial application value.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method and device for reducing nitrate in an acid solution. Background technique [0002] There are three main methods for the removal of nitrate in industrial wastewater: physical method, biological denitrification method and chemical reduction method. Physical methods mainly include electrodialysis, reverse osmosis, distillation, ion exchange, etc. Due to the high cost of removing nitrate nitrogen in water by physical methods, and the removal is not selective and incomplete, only the occurrence of pollutants Diversion or concentration, and not suitable for spent acid. The biological method is to convert nitrate into other forms through the action of microorganisms. The disadvantage of this method is that it depends on the action of microorganisms, takes a long time to degrade nitrate, has poor impact resistance, is significantly affected by the enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/16
CPCC02F1/70C02F2101/163Y02A50/20
Inventor 向龙曹羽芹邹辉
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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