Method for recycling wastewater containing high-concentration ammonia nitrogen

An ammonia nitrogen wastewater, high concentration technology, applied in chemical instruments and methods, water pollutants, hydrogen production and other directions, can solve problems such as the inability to achieve harmless ammonia nitrogen

Active Publication Date: 2013-05-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Aiming at the problem that the existing treatment method of wastewater containing high concentration of ammonia nitrogen cannot realize the harmless treatment of ammonia nitrogen, the present invention provides a resource of wastewater containing high concentration of ammonia nitrogen The method is to concentrate and purify the high-concentration ammonia nitrogen in the wastewater through processes such as stripping and adsorption, and then continue to carry out catalytic electrolysis reaction on ammonia nitrogen to produce hydrogen, and collect and purify the generated hydrogen. The hydrogen in it can continue to be used as Raw materials for hydrogen batteries, other synthetic reactions, etc., to realize the recycling of high-concentration nitrogen-containing wastewater

Method used

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Effect test

Embodiment 1

[0040] The concentration of ammonia nitrogen in the wastewater is 1000-10000mg / L, and the pH is controlled between 9 and 11. The lye and electric energy are consumed, and the air is blown off to blow off more than 90% of the high-concentration ammonia nitrogen from the wastewater, followed by lye Absorb the ammonia nitrogen blown out to complete the concentration and purification of ammonia nitrogen;

[0041] The design parameters of the electrolytic reaction device used in the ammonia nitrogen electrolytic hydrogen production test are: the appearance size is 190mm×110mm×180mm; the iron plate and the graphite electrode are 2 pieces each, and the size is 100mm×100mm×5mm; the DC output voltage of the current regulator 1-15V, current 1-10A. Table 1 shows the results of the electrolysis of two ammonia nitrogen solutions with different concentrations under the conditions of a voltage of 5V and a distance between the plates of 1.5cm.

[0042] time (min) Ammonia nitrogen...

Embodiment 2

[0046] The concentration of ammonia nitrogen in the wastewater is 1000-10000mg / L, and the packing blow-off tower is used to control the pH between 9-11, and the air is blown off for 1.5-2 hours to blow off the high-concentration ammonia-nitrogen above 70-95% from the waste water. The lye is used to absorb the stripped ammonia nitrogen to complete the concentration and purification of ammonia nitrogen; the electrolytic reaction device used in the ammonia nitrogen electrolytic hydrogen production test uses a modified electrode coated with Pt, Rh and Ir precious metals on the surface; the voltage is 1-15V, Current 1-10A. Under the conditions of a voltage of 5V and a distance between plates of 1.5cm, the concentration of electrolyzed ammonia nitrogen is between 5000 and 10000mg / L, and the conversion rate of ammonia nitrogen is 91.4%.

Embodiment 3

[0048] The concentration of ammonia nitrogen in the wastewater is 5000-8000mg / L, and the packed stripping tower controls the pH between 10 and 13, air blows off for 2 hours, and blows off more than 90% of the high-concentration ammonia nitrogen from the wastewater at a temperature of 30-50 °C out, and then use lye to absorb the stripped ammonia nitrogen to complete the concentration and purification of ammonia nitrogen; the electrolytic reactor adopts modified electrodes coated with Ti, Rh and Ir precious metals on the surface; the voltage is 7.5V, and the current is 5A. Under the condition that the distance between the plates is 2cm, the concentration of electrolytic ammonia nitrogen is between 5000 and 10000 mg / L, and the conversion rate of ammonia nitrogen is greater than 90%.

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Abstract

The invention discloses a method for recycling wastewater containing high-concentration ammonia nitrogen, belonging to the field of recycling of organic wastewater. The method comprises the following steps: carrying out a stripping-adsorption purification process on nitrogen-containing high-concentration organic wastewater to strip high-concentration ammonia nitrogen (higher than 90%) out of the wastewater while controlling the pH value at 9-11, and concentrating and purifying the ammonia nitrogen in the wastewater; and carrying out electrolytic hydrogen production reaction on the concentrated and purified high-concentration ammonia nitrogen under the voltage of 1-15V and the current of 1-10A, so as to convert the ammonia nitrogen into nitrogen and hydrogen, wherein the hydrogen is collected. The invention overcomes the defects of high secondary pollution and high environment treatment cost when a chemical precipitation method and other physicochemical techniques are specially used for denitrification, and also overcomes the defects that the concentration can not be too high, the activity of sludge can be easily inhibited by the high-concentration ammonia nitrogen, and the ammonianitrogen can only be converted into harmless substances when the conventional biochemical method is used for treating ammonia nitrogen. The invention converts high-concentration ammonia nitrogen in wastewater into resources, and the effluent water meets the first grade discharge standard in the national 'Integrated Wastewater Discharge Standard' (GB8978-96).

Description

technical field [0001] The invention relates to a treatment method for ammonia-nitrogen wastewater, more specifically a resource recovery method for wastewater containing high-concentration ammonia-nitrogen. Background technique [0002] At present, many industrial wastewaters, such as landfill leachate, coking, synthetic ammonia, and pharmaceuticals, contain high concentrations of ammonia nitrogen. Once these ammonia nitrogen wastewater is discharged into the water body, it will quickly consume dissolved oxygen in the water body, resulting in rapid enrichment of the water body. Nutritization will lead to rapid deterioration of local water quality. [0003] For the high concentration of ammonia nitrogen contained in wastewater, physical and chemical nitrogen removal measures such as air stripping, precipitation, membrane absorption and wet oxidation are usually used, and the efficiency of nitrogen removal is relatively high. To improve the PH value of wastewater, so that am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/02C02F9/08C02F1/461C02F1/20C25B11/08C01B3/04C02F101/16
CPCY02E60/364Y02E60/36
Inventor 丁原红潘丙才杨云军
Owner NANJING UNIV
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