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 steam / ton wastewater. The operating cost is still high, and the process is complicated, the number of equipment sets is large, more automatic control instruments and automatic valves are required, the control requirements are high, and the investment is high
[0006] For the problems in the above-mentioned related technologies, no effective solution has been proposed yet

Method used

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

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Embodiment 1

[0020] Adopt process of the present invention to handle ammonia nitrogen wastewater, ammonia nitrogen wastewater B treatment capacity is 20m 3 / h, ammonia nitrogen concentration is 4500mg / L, at first adjust the pH value of ammonia nitrogen wastewater B to 11 with sodium hydroxide solution, pump into the raw material preheater 1 to preheat and then enter the stripping section of stripping deamination tower 2 , contact with the rising steam at the bottom of the tower, and finally flow into the liquid tank 3 of the tower kettle, the ammonia in the waste water is transferred to the steam, and rises to the top of the tower with the steam, and the ammonia-containing steam at the top of the tower is extracted by the steam compressor 7 and pressurized into the re- Boiler 6, in this process, the temperature, pressure and enthalpy of ammonia-containing vapor increase; Tower still liquid circulation pump 5 makes tower still liquid in reboiler 6, the bottom of stripping deamination tower 2...

Embodiment 2

[0022] Adopt process of the present invention to process ammonia nitrogen wastewater, ammonia nitrogen wastewater B treatment capacity is 40m 3 / h, the concentration of ammonia nitrogen is 18000mg / L, and its mode of operation is the same as that of Example 1. An ammonia absorption tower is then connected to absorb with frozen pure water, and the production concentration per hour is 4 tons of strong ammonia water of 17.5%. Less than 67.5mg / L, the water and electricity consumption per ton is 9.2 degrees.

Embodiment 3

[0024] Adopt process of the present invention to process ammonia nitrogen waste water, the processing capacity of ammonia nitrogen waste water B is 10m 3 / h, ammonia nitrogen concentration is 32000mg / L, and its mode of operation is the same as embodiment 1, connects an ammonia absorption tower afterwards, absorbs with dilute sulfuric acid, and production concentration is the ammonium sulfate solution of 28.5%, and the wastewater ammonia nitrogen concentration after treatment is less than 50mg / L L, water and electricity consumption per ton is 9.8 degrees.

[0025]To sum up, with the help of the above-mentioned technical solution of the present invention, the present invention has the advantages of low operating cost, small footprint, less public works, simple process, few sets of equipment, convenient maintenance and operation management, high degree of automation, The total investment is less and so on.

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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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