Ammonium nitrate waste water treatment method

Abstract

The invention provides an ammonium nitrate-containing waste water processing method, merging secondary steam supplementary reaction and enhanced humidifying and washing into one and performing in high efficiency, and selecting multi-effect evaporating and / or single-effect mechanical compression processing method to make ammonia and ammonium nitrate pollutants in waste water return into a neutralizer in a form of 15%-35% thick ammonium nitrate solution and recovered, and besides, the processed waste water does not contain dissociative ammonia but has an ammonium nitrate content of 15-30ppm, achieving the use requirements of entering nitric acid equipment, achieving the recycling and zero-discharge purpose; and the efficiency is largely raised and the energy consumption is largely reduced. And it is especially applied to processing the waste water in the pressure-neutralizing process of high concentration nitric acid feedstock, and also applied to other similar processes, such as processing of waste water with sulfate, phosphate, nitrate, nitrite and other nonvolatile components.

Description

technical field [0001] The invention relates to a method for treating ammonium nitrate wastewater, in particular to a method for treating ammonium nitrate wastewater which minimizes the treatment of ammonium nitrate wastewater by using "source reduction" and "recycling". Background technique [0002] In the ammonium nitrate production process, especially in the high-concentration nitric acid pressurized neutralization process, the synthesis of one ton of ammonium nitrate produces about 0.4 tons of secondary steam containing 0.4% to 1.0% of free ammonia and 0.4% to 0.6% of ammonium nitrate, and In the process of evaporation and concentration of ammonium nitrate solution, evaporative condensate with a total nitrogen content of 0.4% to 0.8% related to the concentration of ammonium nitrate is produced at the same time. waste water. The usual treatment methods do not meet the emission standards, and most manufacturers use dilution methods to discharge outside, which not only cau...

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Problems solved by technology

[0004] The present invention takes "source reduction" and "recycling" as the means of priority for the minimization of ammonium nitrate wastewater treatment to solve the problem of environmental pollution caused by nitrogen and ammonia in ammonium nitrate wastewater that cannot be treated up to the discharge standard during the production process of ammonium nitrate , providing a method for ammonium nitrate wastewater treatment to meet the requirements of standard discharge and zero discharge

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