The invention discloses a method for concentrating a high-
salinity wastewater at low temperature. The method is characterized by comprising the following steps: feeding, single-effect
evaporation, two-effect heat exchange, two-effect
evaporation and separation. Especially, a steam
machine recompression
evaporator is adopted to carry out low-temperature
evaporation concentration in the single-effect evaporation step, and the
concentration effect is good. By adopting the method for concentrating the high-
salinity wastewater at low temperature, the
evaporation temperature of the high-
salinity wastewater is reduced, energy is saved, the environment is protected,
energy consumption for evaporating 1t of water is about 1 / 8 to 1 / 7 of that of the traditional
evaporator, the method completely gets rid of dependence on a steam boiler, the MVR mainly consumes
electric energy after consuming steam, an
energy source is saved, the cost is reduced, the automatic degree is high, the
work flow is full-automatic, and method is free of manual control.