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Reduction treatment method for nitrates in water

A nitrate and water treatment technology, applied in the field of water treatment, can solve the problems of low concentration, failure to reach, reduce total nitrogen in water, etc., and achieve the effects of good sedimentation performance, no secondary pollution, and low concentration of metal ions

Inactive Publication Date: 2014-02-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]However, so far, the use of patina to treat nitrate has not been reported in China, and the research of foreign scholars in this area also focuses on the improvement of the reduction rate, almost all According to the literature, the final reduction product of nitrate is ammonium. Although it has been reported in the literature, N2O and N2 may be produced during the reduction process, but the concentration is Below the detection limit (3)
For water treatment, this does not achieve the goal of reducing total nitrogen in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Accurately weigh 5.56g FeSO 4 ·7H 2 O, 1.6 g Fe 2 (SO 4 ) 3 , 0.225g CuSO 4 ·5H 2 O and 0.6664g Al 2 (SO 4 ) 3 18H 2 O was dissolved in 100 mL of fresh anaerobic deionized water, and poured into a three-neck flask, configured with 1 mol / L NaOH solution, and transferred to a constant pressure titration funnel. The three ports are respectively connected to the constant pressure titration funnel, pH electrode and inert gas vent, and the joints are sealed. NaOH solution was added dropwise, and the magnetic stirring was continued until the pH of the solution was stabilized at 7.0 and maintained for a period of time, and the reaction was completed. 40 o C was aged for 24 hours, filtered through a 0.45 μm filter membrane, washed several times with fresh anaerobic deionized water, and the filter cake was freeze-dried to obtain the product.

[0022] use KNO 3 Prepare simulated wastewater with a nitrate concentration (calculated as nitrogen) of 40mg / L with fresh anae...

Embodiment 2

[0025] Accurately weigh 5.56g FeSO 4 ·7H 2 O, 1.6 g Fe 2 (SO 4 ) 3 and 0.6664g Al 2 (SO 4 ) 3 18H 2 O, weigh 0g, 0.0375g, 0.075g, 0.225g and 0.375g CuSO respectively 4 ·5H 2 O was dissolved in 100 mL of fresh anaerobic deionized water, and poured into a three-neck flask, configured with 1 mol / L NaOH solution, and transferred to a constant pressure titration funnel. The three ports are respectively connected to the constant pressure titration funnel, pH electrode and inert gas vent, and the joints are sealed. NaOH solution was added dropwise, and the magnetic stirring was continued until the pH of the solution was stabilized at 7.0 and maintained for a period of time, and the reaction was completed. 40 o C was aged for 24 hours, filtered through a 0.45 μm filter membrane, washed several times with fresh anaerobic deionized water, and the filter cake was freeze-dried to obtain the product.

[0026] use KNO 3 Prepare simulated wastewater with a nitrate concentration ...

Embodiment 3

[0029] Accurately weigh 5.56g FeSO 4 ·7H 2 O, 1.6 g Fe 2 (SO 4 ) 3 , 0.225g CuSO 4 ·5H 2 O and 0.6664g Al 2 (SO 4 ) 3 18H 2 O was dissolved in 100 mL of fresh anaerobic deionized water, and poured into a three-neck flask, configured with 1 mol / L NaOH solution, and transferred to a constant pressure titration funnel. The three ports are respectively connected to the constant pressure titration funnel, pH electrode and inert gas vent, and the joints are sealed. NaOH solution was added dropwise, and the magnetic stirring was continued until the pH of the solution was stabilized at 7.0 and maintained for a period of time, and the reaction was completed. 40 oC was aged for 24 hours, filtered through a 0.45 μm filter membrane, washed several times with fresh anaerobic deionized water, and the filter cake was freeze-dried to obtain the product.

[0030] use KNO 3 Prepare simulated wastewater with a nitrate concentration (calculated as nitrogen) of 40mg / L with fresh anaer...

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PUM

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Abstract

The invention belongs to the technical field of water treatment, and relates to a reduction treatment method for nitrates in water. Green rust LDH (Layered double hydroxides) are fed into nitrate-containing wastewater to react, so that the reaction rate thereof on reducing nitrates in water and the partial removal of total nitrogen are effectively improved. According to the invention, nitrates are subjected to reduction treatment by using the reducibility of green rusts, and then under the action of catalyst ions, part of the LDH is transferred into an environmental-friendly gas N2, so that the reaction time is short, and more than 95% of the nitrates can be removed within 4h; the removal rate of total nitrogen is more than 35%; the method is good in iron cement sedimentation and simple in operation, and has good economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a novel material for treating nitrates and a method for reducing and treating nitrates in water. Background technique [0002] Due to the discharge of nitrogen-containing wastewater from industrial production, the application of agricultural nitrogen fertilizers, and the discharge of domestic sewage, the environmental pollution is becoming more and more serious. The problem of nitrate pollution has attracted widespread attention at home and abroad. High NO 3 - After entering the human body, it is easily reduced to NO 2 - , NO 2 - And then converted into carcinogenic nitrosamines. [0003] Countries and regions all over the world have set maximum limits for nitrate content in drinking water, such as the drinking water quality standards promulgated by the European Union and the World Health Organization (WHO). 3 -_ The maximum limit value concentration of N is 11.3mg / ...

Claims

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Application Information

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IPC IPC(8): C02F1/70
Inventor 陆永生吴祖龙张在屋王展王瑶钱光人
Owner SHANGHAI UNIV
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