Technique for treating high-ammonia-nitrogen wastewater by recycling ammonium sulfate through MVR (Mechanical Vapor Recompression) ammonia distillation

Abstract

The invention discloses a technique for treating high-ammonia-nitrogen wastewater by recycling ammonium sulfate through MVR ammonia distillation. A steam closed cycle ammonia distillation technique is realized by virtue of alkali adjustment of high-ammonia-nitrogen wastewater and a mechanical vapor recompression (MVR) technique, ammonia nitrogen in treated wastewater is less than 10mg / L, and industrial product ammonium sulfate is recycled by carrying out MVR concentration and crystallization on a produced 25% ammonium sulfate solution.

Description

technical field [0001] The invention relates to a high-ammonia-nitrogen wastewater treatment technology, in particular to a technology for treating high-ammonia-nitrogen wastewater by MVR distilling ammonia and recovering ammonium sulfate. Background technique [0002] Ammonia is an important industrial raw material, which has been widely used in pharmaceutical, food processing, rare earth smelting and other industries, but at the same time, too much ammonia will become an important part of environmental pollution, not only ammonia pollution exists in domestic sewage, but also High ammonia pollution also exists in many industries such as rare earth, foaming agent, catalyst, pesticide, monosodium glutamate, chemical fertilizer, leather, gunpowder, coking, oil refining, meat processing, etc. The concentration of ammonia nitrogen varies from 200mg / L to 100000mg / L, far It is higher than the concentration of ammonia in domestic sewage, even in the leachate produced by landfill, t...

AI Technical Summary

Problems solved by technology

The blow-off method is divided into steam blow-off and air blow-off. The ammonia nitrogen at the outlet of steam blow-off can reach below 10mg / l, but the energy consumption is high; the energy consumption of conventional air blow-off is low, but the gas-water ratio is 3000-6000, resulting in Large, and the blow-off efficiency is generally lower than 70%, and its fatal disadvantage is that it emits a large amount of blow-off tail gas, and it is difficult to discharge the tail gas up to the standard

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