System and method for treating ammonia-nitrogen wastewater

Abstract

The invention provides a system and a method for treating ammonia-nitrogen wastewater. The system for treating ammonia-nitrogen wastewater comprises a preheating unit, a multi-effect evaporation unit,a gas-liquid separation unit and a concentrate combustion unit; the discharge port of the preheating unit is connected with the feed port of the multi-effect evaporation unit, the gas discharge portof the multi-effect evaporation unit is connected with the gas-liquid separation unit, and the liquid outlet of the multi-effect evaporation unit is connected with the concentrate combustion unit; andthe concentrate combustion unit comprises a concentrate combustion device, a heat exchange device and a tail gas treatment device which are connected in sequence. The ammonia-nitrogen wastewater is concentrated, and the obtained concentrate is combusted to recycle the ammonia-nitrogen wastewater; and the system has the advantages of low energy consumption, high pollutant removal rate, and positive effect on environmental protection.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment, and relates to a wastewater treatment system and method, in particular to an ammonia nitrogen wastewater treatment system and method. Background technique [0002] Amination refers to the reaction of introducing amino groups into organic compounds. Therefore, the wastewater produced by the amination process has the characteristics of high ammonia nitrogen and high COD. In the prior art, treatment methods for high COD wastewater include physical methods, chemical methods, biological methods and combined treatment methods. [0003] The physical methods include adsorption methods, coagulation sedimentation methods, and membrane filtration methods. For example, CN 109205939 A discloses a method for treating ammonia nitrogen wastewater by using an adsorbent, comprising: (1) selecting phosphate, silicate and magnesium salt as the raw material of the adsorbent, and uniformly mixing them int...

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Problems solved by technology

[0008] However, the process of pure chemical treatment of wastewater is complicated, and it needs to add a variety of additional components at the same time, the cost is high, and the treatment effect is unstable

[0009] For the treatment of high ammonia nitrogen wastewater, the current treatment methods include biological nitrification and denitrification, breakpoint chlorination, gas stripping, precipitation and ion exchange methods, and then the biological method uses the metabolism of microorganisms to complete the degradation of organic matter in wastewater. It has the characteristics of wide application range, large treatment capacity, and low operating cost, but it is only suitable for treating organic wastewater with a salt content lower than 5000mg / L, and it is difficult to treat organic wastewater with a high salt content

Moreover, the biological method has low treatment efficiency and is not suitable for application scenarios that require high treatment efficiency.

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