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Method for treating high-concentration ammonia nitrogen in urea

A high-concentration, ammonia-nitrogen technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve environmental secondary pollution, aging, ammonia emissions, etc.

Inactive Publication Date: 2015-09-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide an organic composite denitrification agent modified magnesium in view of the fact that there is ammonia gas discharge in the process of treating high-concentration ammonia-nitrogen wastewater in the current organic composite denitrification agent combined with blow-off method, which causes secondary environmental pollution. Aluminum-iron hydrotalcite nano-magnetic adsorption material can absorb high-concentration ammonia nitrogen in wastewater, and can age the surface layer of the adsorption material after saturation. Under the action of external magnetic field and water flow, the adsorption material can be renewed without regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] First, weigh 6.0g of magnesium nitrate, 4.8g of aluminum nitrate, and 15.6g of ferric nitrate and dissolve them in 350ml of anhydrous ethanol solution containing 7.0g of urea, stir at room temperature for 1 hour, then pour into a hydrothermal reaction kettle and heat to 140°C. React for 12 hours, cool to room temperature, wash twice with ethanol and deionized water, and dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcite, and then use the above-mentioned nano-magnesium-aluminum-iron hydrotalcite with a mass concentration of 36.5% in turn. Soak in hydrochloric acid and saturated potassium hydroxide solution for 8 hours, place in a muffle furnace, dry at a temperature of 105°C, and magnetize near a magnetic field. In 10g of organic composite denitrification agent, wherein it contains 5.0g ethyl lactate, 2.0g ethyl cyclopropyl formate, 3.0g aminobutyric acid, and then stir for 40min, then use the modified nano magnesium aluminum iron hydrotalcite mat...

example 2

[0025] First, weigh 5.0g of magnesium nitrate, 5.2g of aluminum nitrate, and 13.6g of ferric nitrate and dissolve them in 400ml of anhydrous ethanol solution containing 6.4g of urea, stir at room temperature for 1 hour, then pour into a hydrothermal reaction kettle and heat to 140°C. React for 12 hours, cool to room temperature, wash twice with ethanol and deionized water, and dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcite, and then use the above-mentioned nano-magnesium-aluminum-iron hydrotalcite with a mass concentration of 36.5% in turn. Soak in hydrochloric acid and saturated potassium hydroxide solution for 8 hours, place in a muffle furnace, dry at a temperature of 105°C, and magnetize near a magnetic field. 20g of organic composite denitrification agent, which contains 10g of ethyl lactate, 4g of ethyl cyclopropanate, 6g of aminobutyric acid, stirred for 40min, and then the modified nano-magnesium-aluminum-iron hydrotalcite material was clean...

example 3

[0027] First, weigh 7.1g of magnesium nitrate, 4.8g of aluminum nitrate, and 15.6g of ferric nitrate and dissolve them in 350ml of absolute ethanol solution containing 6.4g of urea, stir at room temperature for 1 hour, then pour into a hydrothermal reaction kettle and heat to 140°C. React for 12 hours, cool to room temperature, wash twice with ethanol and deionized water, and dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcite, and then use the above-mentioned nano-magnesium-aluminum-iron hydrotalcite with a mass concentration of 36.5% in turn. Soak in hydrochloric acid and saturated potassium hydroxide solution for 8 hours, place in a muffle furnace, dry at a temperature of 105°C, and magnetize near a magnetic field. 30g of organic composite denitrification agent, which contains 15g of ethyl lactate, 6g of ethyl cyclopropanate, 9g of aminobutyric acid, stirred for 40min, and then the modified nano-magnesium-aluminum-iron hydrotalcite material was cleane...

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Abstract

The invention relates to a method for treating high-concentration ammonia nitrogen in urea and belongs to the field of wastewater treatment. The method comprises the following steps: preparing a viscous liquid by using a prepared organic compound denitrification agent modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material and an adhesive in a mass ratio of 1:5, applying the viscous liquid to the surface of an adsorption rod, drying, putting the adsorption rod coated with the viscous liquid into an adsorption tower, enabling urea to flow through the adsorption tower until the organic compound denitrification agent modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material on the surface of the adsorption rod adsorbs urea to be saturated, enabling aged surface layers of the organic compound denitrification agent modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material one by one under the action of flashing of landfill leachate flow and an external magnetic field, and finally testing the content of ammonia nitrogen in wastewater. No ammonia gas can be generated to diffuse into the atmosphere, and no precipitate can be generated either, no secondary environment pollution can be caused, the adsorption material does not need to be regenerated, the ammonia nitrogen concentration is less than 1mg / L, and the removal rate is 99.99% or above.

Description

technical field [0001] The invention discloses a method for treating high-concentration ammonia nitrogen in urine, which belongs to the field of waste water treatment. Background technique [0002] Urine is weakly acidic, with a pH of about 6.5, and its main components are urea, ammonia, phosphate, organic substances, bacteria, etc. Most of the nitrogen in urine exists in the form of ammonia nitrogen, and the ammonia nitrogen in human urine has accounted for 80% of the influent ammonia nitrogen load in wastewater treatment. A large amount of ammonia nitrogen discharge not only causes the pollution of the water environment, eutrophication of the water body, and red tides in the water body, but also causes the reproduction of microorganisms in the water equipment in the industrial wastewater treatment and reuse projects to form biofouling, blockage of pipes and water equipment, affecting heat exchange. [0003] At present, the air flotation method is mainly used to deal with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58B01J20/08B01J20/30C02F101/16
Inventor 陈毅忠张帆
Owner CHANGZHOU UNIV
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