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Device and method for recovering ammonia during wastewater treatment

A technology for wastewater treatment and ammonia recovery, applied in water/sewage multi-stage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of inability to effectively guarantee the removal effect of ammonia nitrogen, small gas-liquid contact area, etc. Problems, to avoid air pollution, easy to operate, expand the effect of the contact area

Inactive Publication Date: 2011-08-31
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this operating condition, the vacuum degree is as high as 0.09MPa (700mmHg), which can prevent air pollution, but the device uses a cylindrical deammonization tank, and the gas-liquid contact area is small, so that the removal rate of ammonia nitrogen can be improved, so it cannot be effectively guaranteed. Ammonia nitrogen removal effect

Method used

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  • Device and method for recovering ammonia during wastewater treatment
  • Device and method for recovering ammonia during wastewater treatment
  • Device and method for recovering ammonia during wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The wastewater with an ammonia nitrogen content of 1194 mg / L ammonium chloride is treated and ammonia is recovered. The experimental vacuum is controlled at 0.04-0.06MPa, and the heater temperature is controlled at 40-50°C. The removal rate of ammonia nitrogen reaches over 99% within three hours.

[0022] time (h)

Embodiment 2

[0024] The phenol-containing wastewater with an ammonia nitrogen content of 3000mg / L is treated and ammonia is recovered. In the experiment, the vacuum degree was controlled at 0.04-0.06MPa, and the heater temperature was controlled at 40-50°C. The removal rate of ammonia nitrogen reaches over 99% within three hours, and the recovery rate of ammonia reaches over 99%.

[0025] time (h)

Embodiment 3

[0026] Example 3: Treat oily wastewater with an ammonia nitrogen content of 1322 mg / L and recover ammonia. The experimental vacuum is controlled at 0.04-0.06MPa, and the heater temperature is controlled at 40-50°C. The removal rate of ammonia nitrogen reached over 99% within three hours, and the presence of oil did not have much influence on the removal of ammonia nitrogen.

[0027] time (h)

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PUM

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Abstract

The invention belongs to the field of wastewater treatment technologies and resource recycling and relates to a device and method for recovering ammonia during wastewater treatment. In the invention, on the basis of chemical equilibrium and the difference of boiling points of NH3 and H2O, a principle that ammonia volatilizes and water does not volatilize when the temperature is controlled at 40-60 DEG C and the vacuum degree is controlled at 0.04-0.06MPa is adopted, and processes of vacuum and bubbling reinforced stirring and falling film heating are utilized under a lower temperature by utilizing a vacuum falling film bubbling and deaminizing device to enlarge the contact surface between a gas phase and a liquid phase and enhance the removal effect of ammonia nitrogen, and the volatilized ammonia is recovered by utilizing the negative pressure to avoid air pollution. By means of the method and the device disclosed by the invention, the advantages of high recovery rate, low energy consumption, convenience for operation and capability of continuous and intermittent production are achieved.

Description

technical field [0001] The invention belongs to the field of waste water treatment technology and resource recycling, and relates to a device and method for waste water treatment and recovery of ammonia. Background technique [0002] Chemical, coking, chemical fertilizer, oil refining, metallurgy and other enterprises are the main discharge sources of high-concentration ammonia-nitrogen wastewater. The composition is complex, the concentration of pollutants is high, it is difficult to biochemically degrade, and it is very harmful. At present, the removal of ammonia nitrogen in industrial wastewater usually adopts biological method, stripping method, ion exchange method, break point chlorination method, etc., among which the biological method is through nitrification and denitrification process. It occupies a large area, has a high primary investment cost, and has a long removal period. It is converted into inactive gaseous nitrogen and released into the atmosphere, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/10C02F1/02C02F1/66
Inventor 马伟王刃赵南南程子洪张星林载祁黄琦
Owner DALIAN UNIV OF TECH
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