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.

Key words: saline waste water, mechanical vapor recompression, plate heat exchanger, flash evaporation, zero release

摘要：

随着环保要求的不断提高，零排放技术成为实现污水资源化利用的重要路径。为了了解零排放技术中的机械式蒸汽再压缩（MVR）蒸发结晶技术对含盐废水的实际处理情况，并为国内废水零排放工程的设计与运行提供参考，以江苏某光纤制品厂产生的高浓度含盐废水处理工程为对象，介绍了MVR蒸发结晶技术处理含盐废水的工艺流程和运行情况，同时对系统的经济性进行了分析。该工程基于MVR工艺原理，采用外置式板式换热器与闪蒸蒸发器形成的蒸发结晶系统。结果显示，蒸发结晶系统实际处理量为48 t/d，系统的脱盐率为99.23%，冷凝水指标达到厂内回用水指标，回收率为93.47%，结晶产生的废盐纯度为96%，达到了《工业盐》（GB/T 5462—2015）工业湿盐一级标准，吨水处理成本为65.03元。运用MVR蒸发结晶技术对含盐废水处理节能环保，无污染物外排，做到了工业废水的近零排放。

关键词: 含盐废水, 机械式蒸汽再压缩, 板式换热器, 闪蒸, 零排放

CLC Number: 

• X703