Greenlan heat pump evaporator uses the heat generated by the heat pump to separate water and pollutants from waste to get clear distilled water under low temperature around 35℃ and it can reduce COD as high as 99% to reuse the distillate water or discharge directly. The equipment is automatic operation without the unattended. It can treat industrial wastewater into high concentrated liquid. This greatly reduces the hazardous waste treatment amount and achieve cost saving. This equipment is widely used in mechanical steel industry, metal wire, casting, aluminum products, galvanizing wastewater, pharmaceutical, chemical, emulsion, coating agent, medicine, high salt wastewater, high COD wastewater, etc.