Brief Introduction

       Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical engineering, electronics, and instrumentation. Heavy metal (such as cadmium, nickel, mercury, zinc, etc.) wastewater is one of the industrial wastewater that pollutes the environment the most and harms humans the most, and its water quality and quantity are related to the production process. The heavy metals in wastewater generally cannot be decomposed and destroyed, but can only transfer their location and change their physical and chemical forms. The treatment method is to first reform the production process, do not use or use less toxic heavy metals, in-situ treatment at the production site (if not discharged from the production workshop) often use chemical precipitation method, ion exchange method, etc., the treatment of heavy metals in the water is lower than Emission standards can be discharged or reused. The formation of new heavy metal concentrated products is recycled as much as possible or treated in a harmless manner.

Approach

       The heavy metal wastewater evaporation system includes a steam compressor and a preheater, a heat exchanger and an evaporative crystallizer connected in sequence. The outlet of the evaporative crystallizer is connected to the inlet of the steam compressor and the inlet of the cooling device respectively. The air outlet of the vapor compressor and the air outlet of the preheating device are respectively connected with the shell side air inlet and the tube side air inlet of the heat exchange device, and the evaporative crystallization device is provided with a discharge outlet. The evaporation system evaporates the water in the wastewater into water vapor, and finally condenses it back to the production workshop. The evaporated residual salt is treated as hazardous waste, so as to achieve true zero discharge and truly solve the problem that has been plagued by the development of the heavy metal industry, especially the PCB industry. Pollution problems; and the evaporation system does not require steam generation during the entire evaporation process except for the startup, and has the advantages of lower energy consumption, less floor space, high efficiency, and high degree of automation than traditional evaporators.