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Method for treating high-concentration ammonia nitrogen in leather wastewater

A high-concentration technology for leather wastewater, applied in chemical instruments and methods, adsorption water/sewage treatment, animal processing wastewater treatment, etc., can solve problems such as ammonia emission, aging, and environmental secondary pollution, and achieve high removal rate, low cost effect

Inactive Publication Date: 2015-09-30
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

[0025] 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 then dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcite, and then use the nano-magnesium-aluminum-iron hydrotalcite prepared above in sequence

[0026] Soak in 36.5% concentrated 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. The talc material was immersed in 10g of organic composite denitrification agent, which contained 2.5g of ethyl lactate, 3.5g of phenylalanine, 4g of stearyl acrylate, and then stirred for 40min, and then the modified nano-magnesium alumin...

example 2

[0028] First weigh 5.0g of magnesium nitrate, 5.2g of aluminum nitrate, and 13.6g of ferric nitrate, dissolve them in 400ml 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 then dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcites, and then use the nano-magnesium-aluminum-iron hydrotalcites prepared above in sequence with a mass concentration of

[0029]Soak in 36.5% concentrated 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. The talc material was immersed in 20g of organic composite denitrification agent, which contained 5g of ethyl lactate, 8g of phenylalanine, 7g of stearyl acrylate, stirred for 40min, and then the modified nano-magn...

example 3

[0031] 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 then dry at 60°C for 6 hours to obtain nano-magnesium-aluminum-iron hydrotalcite, and then use the nano-magnesium-aluminum-iron hydrotalcite prepared above in sequence

[0032] Soak in 36.5% concentrated 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. The talc material is immersed in 30g of organic composite denitrification agent, which contains 7g of ethyl lactate, 12g of phenylalanine, 11g of stearyl acrylate, and then stirred for 40min, and then the modified nano-magnesium aluminum ir...

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Abstract

The invention relates to a method for treating high-concentration ammonia nitrogen in leather wastewater, belonging to the field of wastewater treatment. The method comprises the following steps: mixing an organic composite denitrifier modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorbing material and an adhesive in a mass ratio of 1:5 to obtain a viscous liquid, coating the viscous liquid to the surface layer of an adsorbing bar, drying, putting in an adsorption column, enabling the leather wastewater to flow through the adsorption column until the organic composite denitrifier modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorbing material on the adsorbing bar surface adsorbs ammonia nitrogen to the saturated state, aging the surface layer of the magnesium-aluminum-iron hydrotalcite magnetic nano material by the organic composite denitrifier so that the aged adsorbing material surface layer sheds layer by layer under the actions of leather wastewater flow scour and external magnetic field, and finally, determining the ammonia nitrogen content in the wastewater. The method can not generate harmful gas or cause secondary environment pollution, and does not need to regenerate the adsorbing material. The ammonia nitrogen concentration in the treated wastewater is lower than 0.6 mg / L, and the removal rate is up to 99.99% above.

Description

technical field [0001] The invention discloses a method for treating high-concentration ammonia nitrogen in leather wastewater, belonging to the field of wastewater treatment. Background technique [0002] Leather wastewater contains pollutants such as oil, collagen, animal and plant fibers. Since tanning is a process of collagen fiber-protein processing, a large amount of skin protein is hydrolyzed, and with the ammoniation of protein in the wastewater, the concentration of ammonia nitrogen in the wastewater increases rapidly, and sometimes even the phenomenon that the concentration of ammonia nitrogen increases as the wastewater is treated . A large amount of high-concentration ammonia nitrogen wastewater is discharged into the water body, especially the slow-flowing lakes and bays, which will easily form a large number of algae and other microorganisms in the water, forming eutrophication pollution, causing black and odorous water bodies, quality decline, and nitrate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/22B01J20/28B01J20/30C02F101/16C02F103/24
Inventor 雷春生薛红娟
Owner CHANGZHOU UNIV
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