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Method for treating high-concentration ammonia nitrogen in garbage leachate

A landfill leachate, high-concentration technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary environmental pollution, aging, ammonia emission, etc. Simple to use effects

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

[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, there are 1.5g of polyvinyl chloride, 4.0g of acetic acid, 4.5g of ethylene glycol, stirred for 40min, and then the modified nano-magnesium-aluminum-iron-hydrotalcite material was washed 3...

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. In 20g of organic composite denitrification agent, wherein it contains 3.0g of polyvinyl chloride, 6.0g of acetic acid, 11.0g of ethylene glycol, stirred for 40min, and then the modified nano-magnesium-aluminum-iron hydrotalcite material w...

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. In the 30g organic composite denitrification agent, wherein it contains 4.5g polyvinyl chloride, 6g acetic acid, 19.5g ethylene glycol, stir 40min, then the nano magnesium aluminum iron hydrotalcite material after modification is washed 3 tim...

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Abstract

The invention relates to a method for treating high-concentration ammonia nitrogen in garbage leachate, 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 garbage leachate 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 action of garbage leachate flow scour and external magnetic field, and finally, determining the ammonia nitrogen content in the wastewater. The method can not generate ammonia gas to enter the air or generate any precipitate, can not cause secondary environmental pollution, does not need to regenerate the adsorbing material, and is simple to operate. The ammonia nitrogen removal concentration is lower than 1 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 landfill leachate, belonging to the field of waste water treatment. Background technique [0002] Landfill leachate refers to a liquid with a high concentration of organic or inorganic components produced during the process of stacking and landfill due to biochemical degradation such as compaction and fermentation, and at the same time seepage of precipitation and groundwater. It has ammonia nitrogen content The feature is high, in which the ammonia nitrogen concentration increases with the prolongation of the filling time, and the highest can reach 8000mg / L. 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 biofoul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/22B01J20/30C02F101/16
Inventor 郭迎庆蒋红娟
Owner CHANGZHOU UNIV
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