High-ammonia nitrogen high-salt wastewater resourceful treatment method

Abstract

The invention discloses a high-ammonia nitrogen high-salt wastewater resourceful treatment method which comprises the following steps: with the combination of steam stripping distillation and evaporation, firstly, evaporating wastewater so as to obtain ammonia-containing steam and crystal salt; performing heat exchange on the ammonia-containing steam with a reboiler so as to provide a heat source to a steam stripping distillation tower; centrifuging the crystal salt, abd recycling the crystal salt; feeding weak aqua ammonia obtained after heat exchange of the ammonia-containing steam into the steam stripping distillation tower for deamination concentration so as to obtain ammonium hydroxide recycling, performing up-to-stand discharge on the effluent, or recycling the effluent for production. By adopting the method disclosed by the invention, secondary steam generated from evaporation is adopted as the heat source of the steam stripping distillation tower, steam condensate is adopted as fed water of the steam stripping distillation tower, no intense corrosion medium or caking component is introduced, requirements on equipment materials are reduced, meanwhile the problem that the steam stripping distillation tower is blocked is solved, the cost is reduced, and good market prospects are achieved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for resourceful treatment of waste water with high ammonia nitrogen and high salt. Background technique [0002] At present, in the field of industrial high-ammonia nitrogen and high-salt wastewater treatment, the wastewater is usually first passed into the stripping rectification system for deamination treatment, and then enters the multi-effect evaporation system for desalination treatment, and finally achieves deamination and desalination and achieves the goal of qualified effluent water quality . [0003] However, since both stripping distillation and evaporation require continuous consumption of heat sources and high energy consumption, the traditional process usually heats the stripping distillation system and the evaporation system separately, which cannot realize the reuse of energy and consumes a large amount of steam; secondly, High-ammonia nitrogen and hi...

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Problems solved by technology

[0003] However, since both stripping distillation and evaporation require continuous consumption of heat sources and high energy consumption, the traditional process usually heats the stripping distillation system and the evaporation system separately, which cannot realize the reuse of energy and consumes a large amount of steam; secondly, High-ammonia-nitrogen and high-salt wastewater usually contains strong corrosive ions. In the existing technical solutions, both stripping, rectification and evaporation work in a corrosive environment, which requires high equipment materials, which will inevitably lead to high investment in equipment; again, stripping The rectification tower works under strong alkaline conditions. Once the wastewater in the traditional process contains fouling components, it is easy to scale under alkaline conditions, resulting in blockage of the stripping rectification tower

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