Method for processing high-concentration ammonia nitrogen in rare earth wastewater

A high-concentration, waste-water technology, applied in metallurgical waste water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high energy consumption and high voltage, achieve low energy consumption, low voltage, and eliminate concentration polarization Effect

Inactive Publication Date: 2012-11-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to seek a method for electrolytic removal of high-concentration ammonia-nitrogen in rare-earth wastewater that can simultaneously achieve low power consumption, low cost, and avoid the risk of secondary pollution, the present invention provides a method for treating high-concentration ammonia-nitrogen in rare-earth wastewater. The catalytically active electrode eliminates the concentration polarization of the ion concentration in the surrounding solution, thereby generating a redox reaction to convert the high concentration of ammonia nitrogen in the dilute wastewater into nitrogen and discharge it into the air. The removal rate of ammonia nitrogen is as high as 99.8%, which solves the problem in the prior art The problems of high voltage and high energy consumption avoid the risk of secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First take 105 mesh granular activated carbon, soak it in 0.5M HCl solution for 2 hours, rinse it with deionized water under the action of ultrasonic waves for 3 times, put it into 2M NaOH solution for 4 hours, and then wash it with deionized water under the action of ultrasonic wave for 3 times. and dry it naturally for 2 hours at a temperature of 105°C; then soak the dried granular activated carbon in 2.5M Cu(NO 3 ) 2 , 1.0M Ni((NO 3 ) 2 Put in the mixed solution for 5 hours, dry it naturally, and dry it at a temperature of 105°C for 2 hours; then put the above-mentioned treated granular activated carbon into a hollow cylindrical microporous iron shell as an electrolytic electrode; finally adjust the concentration of ammonia nitrogen to 2500mg / L of rare earth wastewater was passed into the electrolytic cell, and the mass ratio of 0.1% NaCl solid was added. After electrolysis at a voltage of 40V for 3 hours, the ammonia nitrogen concentration in the rare earth waste...

Embodiment 2

[0018] First take 150-mesh granular activated carbon, soak in 0.5M HCl solution for 3 hours, rinse 3 times with deionized water under the action of ultrasonic waves, soak in 2M NaOH solution for 3 hours, and rinse 3 times with deionized water under the action of ultrasonic waves , dried naturally, and dried at a temperature of 105°C for 3 hours; then the dried granular activated carbon was immersed in 2.5M Cu(NO 3 ) 2 , 1.0M Ni((NO 3 ) 2 Put in the mixed solution for 6 hours, dry naturally, and dry at a temperature of 105°C for 3 hours; then put the above-mentioned treated granular activated carbon into a hollow cylindrical microporous iron shell as an electrolytic electrode; finally adjust the concentration of ammonia nitrogen to 5000mg / L of rare earth wastewater was passed into the electrolytic cell, and a mass ratio of 0.5% NaCl solid was added. After electrolysis at 110V for 4 hours, it was measured that the ammonia nitrogen concentration in the rare earth wastewater dr...

Embodiment 3

[0020] First take 125 mesh granular activated carbon, soak in 0.5M HCl solution for 2 hours, rinse 3 times with deionized water under the action of ultrasonic waves, soak in 2M NaOH solution for 4 hours, and rinse 3 times with deionized water under the action of ultrasonic waves , dried naturally, and dried at a temperature of 105°C for 3 hours; then the dried granular activated carbon was immersed in 2.5M Cu(NO 3 ) 2 , 1.0M Ni((NO 3 ) 2 Put in the mixed solution for 5 hours, dry it naturally, and dry it at a temperature of 105°C for 2 hours; then put the above-mentioned treated granular activated carbon into a hollow cylindrical microporous iron shell as an electrolytic electrode; finally adjust the ammonia nitrogen concentration to 3500mg / L of rare earth wastewater was passed into the electrolytic cell, and a mass ratio of 0.3% NaCl solid was added, and after electrolysis at 80V for 3 hours, the ammonia nitrogen concentration in the rare earth wastewater was measured to d...

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Abstract

The invention discloses a method for processing high-concentration ammonia nitrogen in rare earth wastewater. The method comprises the specific steps as follows: firstly, taking 100-mesh to 150-mesh granular active carbon for preparing an electrode with catalytic activity; secondly, filling the rare earth wastewater with the high-concentration ammonia nitrogen into an electrolytic tank; thirdly, adding a NaCl solid and electrolyzing for 3-4h at the voltage of 36-110V; and finally, reducing the concentration of the ammonia nitrogen in the discharged rare earth wastewater to be less than 0.2mg / L. According to the method, the concentration polarization of ion concentration in a surrounding solution is eliminated by the granular active carbon and the electrode with catalytic activity, so thatthe redox reaction is conducted to convert the high-concentration ammonia nitrogen in the rare earth wastewater into nitrogen, and the nitrogen is discharged into the air; the ammonia nitrogen removal rate is more than 99.8%; the voltage is low; the energy consumption is low; and the secondary pollution risk is avoided.

Description

technical field [0001] The invention relates to a method for treating high-concentration ammonia nitrogen in rare earth wastewater, belonging to the field of sewage treatment. Background technique [0002] There are three types of wastewater discharged by pharmaceuticals during the production and smelting of rare earths, mainly acidic wastewater generated by spraying and purifying tail gas of rare earth concentrate roasting, ammonium salt wastewater generated by rare earth carbonate production process, and ammonium salt wastewater generated by rare earth separation. Among them, the rare earth industry produces more than 20 million tons of wastewater every year, with an ammonia nitrogen content of 300-5,000 mg / L, exceeding the national discharge standard by ten to hundreds of times. Ammonia nitrogen pollutants in wastewater is one of the three major wastewater produced in rare earth smelting. Ammonia nitrogen in water quality indicators is an important pollutant that causes w...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F103/16
Inventor 雷春生张凤娥麦源珍
Owner CHANGZHOU UNIV
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