Apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia

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...

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

Images