Method used for treating high concentration ammonia nitrogen in metallurgical waste water

A high-concentration, wastewater technology, applied in the field of high-concentration ammonia nitrogen, can solve problems such as secondary pollution of the environment, and achieve the effects of strong pertinence, high removal rate and low cost

Inactive Publication Date: 2015-09-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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 pollution to the environment. Aluminum-iron hydrotalcite nano-magnetic adsorption material can absorb high-concentration ammonia nitrogen in wastewater, and after saturation, it can age the surface layer of the adsorption material. Under the action of external magnetic field and water flow, the adsorption material can be renewed without regeneration; it saves energy consumption and reduces costs. Can efficiently remove high concentration ammonia nitrogen in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] First weigh 4.8g of magnesium nitrate, 4.2g of aluminum nitrate, and 5.5g of ferric nitrate and dissolve them in 220ml of absolute ethanol solution containing 3.6g of urea, stir at room temperature for 1h, pour into a hydrothermal reaction kettle and heat to 140°C, and react 13h, cooled to room temperature, washed three times with ethanol and deionized water, and then dried at 60°C for 6h to obtain nano-magnesium-aluminum-iron hydrotalcite; Soak in 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; immerse the nano-magnesium aluminum iron hydrotalcite material after pickling, alkali leaching and magnetization in 1g of oxaloacetic acid , 2g potassium oxalate and 7g stearyl acrylate, stir for 25min; wash the modified nano-magnesium aluminum iron hydrotalcite material with deionized water 3 times, and dry it under nitrogen protection; calcined at 800°C for 4h ; The prepared orga...

example 2

[0031]First weigh 8.1g of magnesium nitrate, 5.8g of aluminum nitrate, and 9.7g of ferric nitrate and dissolve them in 310ml of absolute ethanol solution containing 5.3g of urea, stir at room temperature for 1h, pour into a hydrothermal reaction kettle and heat to 140°C, and react 14h, cooled to room temperature, washed three times with ethanol and deionized water, and then dried at 60°C for 6h to obtain nano-magnesium-aluminum-iron hydrotalcite; Soak in 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; immerse the nano-magnesium aluminum iron hydrotalcite material after pickling, alkali leaching and magnetization in 6g of oxaloacetic acid , 8g of potassium oxalate and 6g of stearyl acrylate, stirred for 40min; the modified nano-magnesium aluminum iron hydrotalcite material was washed 3 times with deionized water, dried under nitrogen protection conditions; calcined at a temperature...

example 3

[0033] First, weigh 10.3g of magnesium nitrate, 7.5g of aluminum nitrate, and 13.9g of ferric nitrate and dissolve them in 380ml of absolute ethanol solution containing 7.2g of urea, stir at room temperature for 1h, pour into a hydrothermal reaction kettle and heat to 140°C, and react 15h, cooled to room temperature, washed three times with ethanol and deionized water, and dried at 60°C for 6h to obtain nano-magnesium-aluminum-iron hydrotalcite; Soak in 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; immerse the nano-magnesium aluminum iron hydrotalcite material after pickling, alkali leaching and magnetization in 12g of oxaloacetic acid , 8g potassium oxalate and 20g stearyl acrylate, stir for 65min; wash the modified nano-magnesium aluminum iron hydrotalcite material with deionized water 3 times, and dry it under nitrogen protection; calcined at 900°C for 6h ; The prepared orga...

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Abstract

The invention discloses a method used for treating high concentration ammonia nitrogen in metallurgical waste water, and belongs to the field of metallurgical waste water treatment. According to the method, an organic composite denitrification agent modified magnesium aluminum iron hydrotalcite magnetic nano adsorptive material is prepared via magnetization, modification, drying, and activation, and then adsorption rods are prepared and are arranged in an adsorption tower to treat high concentration ammonia nitrogen in metallurgical waste water. In removing processes, high concentration ammonia nitrogen in waste water is absorbed, after saturation, aging of the surface layer of the adsorption material is realized, and updating of the adsorption material is realized under the action of an applied magnetic field and flow scour, and regeneration is not needed. After shedding, an obtained residue is waterless, and is small in volume; no ammonia gas is generated or released into the atmosphere; no precipitate is obtained; and no environmental secondary pollution is caused. Separation can be realized under the action of the applied magnetic field; ammonia nitrogen concentration is reduce to 0.45mg/L from 2000-6000mg/L; ammonia nitrogen removing ratio is higher than 99.99%; and the method can be used for treating waste water with high concentration ammonia nitrogen, and possesses a promising prospect.

Description

technical field [0001] The invention relates to a method for high-concentration ammonia nitrogen, especially in the technical field of metallurgical wastewater treatment. Background technique [0002] The metallurgical industry is one of the oldest industries in human history. After the industrial revolution in the 18th century, the rapid development of the iron and steel industry caused serious pollution. After entering the 20th century, the scale of metallurgical production increased rapidly, and the content of high-concentration ammonia nitrogen in wastewater continued to increase; , There are many ways to remove ammonia nitrogen in wastewater, such as ion exchange 4 + The zeolite with strong ion selectivity is used as the exchange resin to achieve the purpose of removing ammonia nitrogen. Although this method is simple in process and low in investment and high in removal rate, it is only suitable for medium and low concentration ammonia nitrogen wastewater. For high con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/22B01J20/30B01J20/34C02F101/16
Inventor 雷春生盛艳花
Owner CHANGZHOU UNIV
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