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KDP's evaporator in a printing and dyeing wastewater desalination system

Plate evaporator plays a key role in efficient evaporation concentration and crystallization separation in the desalination of printing and dyeing wastewater, and is particularly suitable for the treatment of high-salt and high-COD wastewater. Its core function is to drive water evaporation through thermal energy, achieve salt concentration and crystallization and fresh water recovery, and reduce the volume of wastewater at the same time.


This case is KDP's evaporator in a printing and dyeing wastewater desalination system. The wastewater characteristics of this printing and dyeing factory are: salt content 8%~10% (mainly Na₂SO₄), COD 5000~8000 mg/L, pH 9~11. Process configuration: 1. Pretreatment: adjust pH to neutral and filter suspended matter. 2. Evaporation system: MVR (mechanical vapor recompression) plate evaporator is used, and the material is titanium plate (Gr.2) (resistant to chloride ion and alkaline corrosion), and the evaporation temperature is 70~90℃. 3. Crystallization separation: forced circulation evaporator crystallizes sodium sulfate, and centrifuge separates and dries. Effect: Fresh water recovery rate ≥ 85%, COD reduced to below 100 mg/L; Sodium sulfate purity ≥ 98%, can be sold as a by-product; Energy consumption is 40% lower than that of multi-effect evaporation.

Plate evaporator realizes resource utilization through efficient evaporation, salt recovery and fresh water regeneration in the desalination of printing and dyeing wastewater. Typical cases show that it can reduce energy consumption by 30%~40% and the salt recovery rate exceeds 90%. Material selection needs to focus on chloride ion tolerance and anti-pollution design. Titanium and 254 SMO stainless steel are the mainstream choices. The future trend will be to develop an intelligent integrated system of MVR+plate evaporation.


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