Application of MVR evaporative crystallization technology in the treatment of high salt wastewater from fiber optic products scrubbing

Abstract

With the continuous improvement of environmental protection requirements，zero emissions technology becomes an important path to achieve the use of sewage resources. A fiber optic product factory in Jiangsu was chosen as object，the process flow and operation of MVR evaporation crystallization technology to treat saline wastewater by MVR evaporation crystallization technology for the treatment of salty wastewater produced was introduced. Furthermore，the economy of the system was analyzed. It is hoped to understand the actual processing effect of the MVR evaporation crystallization technology in zero emissions technology，and provide a reference for the design and operation of zero discharge projects in domestic wastewater. The project was based on the principle of MVR process，using external plate heat exchanger and flash evaporator to form an evaporation crystallization system. The results showed that the actual processing capacity of the evaporation crystallization system was 48 t/d，the system salt rejection rate was 99.23%，the condensate index reached the reuse index in the plant，the recovery rate was 93.47%，and the purity of the waste salt produced by crystallization was 96%. It met the first-class standard of industrial wet salt of Industrial Salt（GB/T 5462—2015），and the cost of water treatment per ton was 65.03 yuan. The evaporation crystallization technology of MVR was applied in the treatment of salt-containing wastewater，which was energy saving and environmental protection，and no pollutants were discharged，achieving the near-zero discharge of industrial wastewater.

Keywords

• saline waste water
• mechanical vapor recompression
• plate heat exchanger
• flash evaporation
• zero release