Apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia

An ammonia nitrogen waste water and recycling technology, applied in heating water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc. It can solve multiple automatic control instruments and automatic valves, no solution is proposed, and there are many sets of equipment. and other problems, to achieve the effect of less public works, less equipment sets, and less total investment

Inactive Publication Date: 2017-02-08
王树岩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the traditional single-effect ammonia distillation process to treat ammonia nitrogen wastewater, the unit steam consumption is as high as 250-300kg steam/ton wastewater. The Beijing University of Chemical Technology patent (200810104999.9) adopts double-effect steam stripping to distill ammonia, and the steam unit consumption is reduced to about 100kg st

Method used

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  • Apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia

Examples

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Example Embodiment

[0019] Example 1:

[0020] The process of the invention is used to treat ammonia nitrogen wastewater, and the treatment volume of ammonia nitrogen wastewater B is 20m 3 / h, the ammonia nitrogen concentration is 4500mg / L, first adjust the pH value of the ammonia nitrogen wastewater B to 11 with sodium hydroxide solution, and use a pump to feed the raw material preheater 1 into the stripping section of the stripping ammonia tower 2 , Contact with the rising steam at the bottom of the tower, and finally flow into the tower kettle liquid tank 3. The ammonia in the waste water is transferred to the steam and rises to the top of the tower with the steam. The ammonia-containing vapor at the top of the tower is extracted by the steam compressor 7 and pressurized into the re Boiler 6, during this process, the temperature, pressure and enthalpy of the ammonia-containing steam increase; the tower still liquid circulating pump 5 makes the tower still liquid in the reboiler 6, the bottom of th...

Example Embodiment

[0021] Example 2:

[0022] The process of the present invention is used to treat ammonia nitrogen wastewater, and the treatment volume of ammonia nitrogen wastewater B is 40m 3 / h, the ammonia nitrogen concentration is 18000mg / L, the operation method is the same as that of Example 1, followed by an ammonia absorption tower, which is absorbed by frozen pure water, and produces 4 tons of concentrated ammonia water with a concentration of 17.5% per hour. The ammonia nitrogen concentration of the treated wastewater Less than 67.5mg / L, water and electricity consumption per ton is 9.2 kWh.

Example Embodiment

[0023] Example 3:

[0024] The process of the present invention is used to treat ammonia nitrogen wastewater, and the treatment volume of ammonia nitrogen wastewater B is 10m 3 / h, the ammonia nitrogen concentration is 32000mg / L, the operation method is the same as that of Example 1, followed by an ammonia absorption tower, which is absorbed by dilute sulfuric acid to produce an ammonium sulfate solution with a concentration of 28.5%. The ammonia nitrogen concentration of the treated wastewater is less than 50mg / L, water and electricity consumption per ton is 9.8 degrees.

[0025] To sum up, with the help of the above technical solutions of the present invention, the present invention has low operating cost, small floor space, few utilities, simple process, few equipment sets, convenient maintenance and operation management, high degree of automation, Advantages such as less total investment.

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Abstract

The invention provides an apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia, belonging to the technical field of chemical engineering. Directed at the defects of high unit steam consumption and operation cost or complex process, multiple sets of equipment, high investment and the like of conventional steam-stripping deamination processes, the invention provides the apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia only by using electric energy. The apparatus comprises a raw material preheater, a stripping deamination tower, a tower-bottom liquid tank, a tower-bottom liquid discharging pump, a tower-bottom liquid circulating pump, a reboiler, a steam compressor, a condensate liquid reflux pump, a condensate liquid separation tank, etc. Only a small amount of steam is needed in system starting; steam needed in stripping is obtained by compressing steam at the top of the stripping deamination tower via the steam compressor and then allowing the compressed steam to pass through the reboiler, and raw steam is not needed after starting; power consumption per ton of water is less than 10 DEG, and operation cost is substantially lower than operation cost in the prior art; and the apparatus further has the advantages of a small occupied land area, needs for few matching public projects, simple process, usage of few sets of equipment, convenience in maintenance and operation management, high automation degree, low total investment, etc.

Description

technical field [0001] The invention relates to a device and process for ammonia nitrogen wastewater treatment and ammonia resource utilization, in particular to a method for treating ammonia nitrogen wastewater by steam stripping and resource utilization of ammonia. Background technique [0002] A large amount of ammonia nitrogen wastewater will be produced in chemical fertilizer, pesticide, foaming agent, catalyst, coal chemical industry and other industries. When the concentration of ammonia nitrogen in the water body increases, it will lead to eutrophication of the water body and make aquatic organisms grow wildly. When these organisms die, they are decomposed by microorganisms in the water, which consume a large amount of dissolved oxygen, causing severe hypoxia in the water body, resulting in the death of a large number of aquatic organisms, and the decayed dead body causes a large number of microorganisms to multiply, and finally makes the water turbid and produces ste...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F101/16
Inventor 王树岩
Owner 王树岩
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