Ammonia nitrogen waste water discharge-reducing and ammonia nitrogen resource utilizing device and method

Abstract

The invention relates to a device for ammonia nitrogen wastewater discharge reduction and ammonia nitrogen resource utilization and a method thereof, and belongs to the field of wastewater discharge reduction. The conventional steam blow-off method has high unit energy consumption (250-300 Kg steam / ton wastewater) in ammonia nitrogen wastewater treatment, thus resulting in very high ammonia nitrogen wastewater treatment cost. The inventive device comprises at least two stages of ammonia nitrogen stripping step and ammonia nitrogen reutilization step. The ammonia nitrogen wastewater to be treated is respectively fed into each stage of ammonia nitrogen stripping step, and the removal of ammonia nitrogen in wastewater is realized in ammonia nitrogen stripping tower and the resource utilization is realized in the ammonia nitrogen reutilization step. Except for the first stage of the ammonia nitrogen stripping tower requiring steam introduction, the steam required on other stages of ammonia nitrogen stripping tower is obtained by vaporization of a part of the tower bottom liquid in each tower by using the heat released via condensation of a part of steam in the upper stage tower and flash evaporation of the tower bottom liquid in the upper stage tower, so as to remarkably reduce steam consumption. The inventive device and method have the advantages of high ammonia nitrogen content wastewater treatment, low ammonia nitrogen content in wastewater after treatment, low steam consumption, and low treatment cost.

Description

technical field [0001] The invention relates to a method for reducing discharge of industrial wastewater and resource utilization, in particular to a method for treating ammonia nitrogen wastewater by steam stripping and resource utilization of ammonia nitrogen. Background technique [0002] A large amount of ammonia nitrogen wastewater will be produced in industries such as chemical fertilizers, pesticides, foaming agents and catalysts. 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 will consume a lot of oxygen in the process of being decomposed by microorganisms in the water, so that the water body is severely anoxic, resulting in the death of a large number of aquatic organisms, and the decayed dead body will lead to a large number of microorganisms, which will eventually make the water body turbid and produce stench. Seriously p...

AI Technical Summary

Problems solved by technology

[0005] The traditional process of the steam stripping method uses lye to adjust the pH value of the wastewater, and then uses steam in the stripping deamination tower to recover the ammonia in the ammonia nitrogen wastewater in the form of ammonia water. Due to serious shortcomings in the design of energy saving and consumption reduction, the ammonia nitrogen wastewater The unit consumption of steam treatment is very high (250-300kg steam / ton of waste water), resulting in high cost of ammonia nitrogen waste water treatment, which makes enterprises unwilling or unable to bear the treatment cost

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