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Method for reducing and degrading nitrates in water in situ

A nitrate, in-situ technology, applied in the direction of reducing water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problem of adding a large amount of metal elemental substances, achieve good application prospects, reduce dosage, and respond quickly Effect

Inactive Publication Date: 2018-01-30
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, this method needs to add a large amount of simple metal to treat nitrate wastewater, and the reaction time varies with the shape of the metal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Under the condition of pH value 14 and magnetic stirring, add NO to 200 mL 3 - -N 1500 mg / L nitrate wastewater, add 1.9 g reducing agent sodium borohydride, after mixing evenly, adjust the temperature of the system to 50°C, add 1.6 g aluminum chloride with six crystallization water dissolved in 25 mL 2mol / L sodium hydroxide solution, continuously stirred for 30 min, after the reaction was completed, cooled to room temperature, filtered to remove the precipitated substance in the solution, and measured the nitrogen content in the solution at this time to be 962 mg / L; then passed the struvite precipitation method The ammonia nitrogen in the solution after the reaction was precipitated and removed, and the nitrogen content of the solution was measured to be 5.54 mg / L.

Embodiment 2

[0020] Under the condition of pH value 14 and magnetic stirring, add NO to 200 mL 3 - -N 1500 mg / L nitrate wastewater, add reducing agent sodium borohydride 1.9 g, after mixing evenly, adjust the temperature of the system to 50°C, add 1.2 g copper chloride with two crystal waters dissolved in 25 mL 1mol / L sodium hydroxide solution, stirring continuously for 60 min, after the reaction is completed, cool to room temperature, filter to remove the precipitated substance in the solution, and measure the nitrogen content in the solution at this time to be 405 mg / L; then pass the struvite precipitation method The ammonia nitrogen in the solution after the reaction was precipitated and removed, and the nitrogen content of the solution was measured to be 0.4 mg / L.

Embodiment 3

[0022] Under the condition of pH value 14 and magnetic stirring, add NO to 200 mL 3 - -N 5000 mg / L nitrate wastewater, add 6 g of reducing agent sodium borohydride, after mixing evenly, adjust the temperature of the system to 50°C, add 3.5 g of copper chloride with two crystal waters dissolved in 50°C to the mixed solution mL 1 mol / L sodium hydroxide solution, keep stirring for 60 min, after the reaction is completed, cool to room temperature, filter to remove the precipitated substance in the solution, measure the nitrogen content in the solution at this time to be 1257 mg / L; The ammonia nitrogen precipitation in the solution after the reaction was removed by precipitation, and the nitrogen content of the measured solution was 0.7 mg / L.

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PUM

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Abstract

The invention relates to a method for reducing and degrading nitrates in water in situ. The method comprises the following steps: adding a reducing agent A into 200mL of waste water containing nitrateaccording to a certain molar ratio under the stirring action of magnetic force and at a certain pH; adjusting the temperature of a system after uniform mixing, adding a certain amount of metal alkalisolution into the mixed solution; continually stirring for 10 to 120 minutes in order to reduce the metal alkali solution into a corresponding metal element reducer in situ; rapidly reducing nitrateto generate ammonia. Through adoption of the method, an adopted denitration manner is rapid in reaction, is suitable for treating waste water containing nitrate at various concentrations, is high in nitrate removing rate; the nitrate in the water can be removed deeply, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for in-situ reduction and degradation of nitrate in water, which can solve the problems of difficult treatment of high-concentration nitrate wastewater and difficult advanced treatment of low-concentration nitrate wastewater. Background technique [0002] Nitrate removal from water is a major issue in water treatment. Trace amounts of nitrate in drinking water can induce methemoglobinemia in infants and increase the risk of cancer in humans. Therefore, the World Health Organization stipulates that the nitrate content in drinking water should not exceed 10 mg NO 3 - -N / L. During the purification process of drinking water, the concentration of nitrate is usually low. However, for some industrial wastewater such as nuclear waste treatment wastewater, the concentration of nitrate can exceed 1 mol / L, and the pH value of the wastewater will be extremely high or ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/16
Inventor 何丹农邓洁童琴代卫国赵昆峰金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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