MVR evaporators, steam compressors, and cooling water circuits. The tube side of the MVR evaporator is connected to the shell side through interconnecting piping and the steam compressor. The cooling water circuit is connected to the steam compressor's intake. The working process of the MVR evaporation system includes a heating phase and a steam phase. During the heating phase, as the steam compressor is not yet operational, the cooling water circuit used to control the steam compressor temperature can be closed. At normal temperatures, untreated liquids such as industrial wastewater enter the tube side of the MVR evaporator. Heat sources like electric heaters are used to heat the untreated liquid until it boils and produces a large amount of steam. Then, the MVR evaporation system proceeds to the distillation phase. The large amount of steam evaporated from the untreated liquid exits the tube side of the MVR evaporator and is compressed by the industrial wastewater treatment equipment's steam compressor to become high-pressure, high-quality steam. This steam enters the shell side of the MVR evaporator. In the shell side, the high-quality steam exchanges heat with the untreated liquid in the tube side through the heat exchange tubes of the MVR evaporator, thereby maintaining the continuous evaporation of the untreated liquid. In the distillation phase, the steam compressor compresses the low-pressure, low-quality steam that exits the shell side into high-pressure, high-quality steam. To prevent the steam compressor from overheating, cold water can be introduced through the cooling water circuit to control the temperature.

The conventional MVR evaporator wastewater treatment system, during the heating phase, utilizes electric heating methods, resulting in a higher heating temperature than the boiling point of the wastewater to be treated. This causes scaling on the heater surface and makes volatile contaminants in the wastewater more volatile at high temperatures, affecting the treatment efficiency during the evaporation phase. In this technical solution, we completely omit additional heat sources like heaters and solely use a steam compressor for heating. This avoids scaling on the heater surface during high-temperature heating and reduces the volatility of contaminants in the wastewater during the heating phase, thereby enhancing the overall treatment efficiency of the MVR evaporator wastewater treatment system for the wastewater to be treated.