Abstract: The invention relates to an apparatus for the purification of a substance from a solution, a suspension or a mixture of liquids by crystallization, preferably in a continuous manner. The apparatus comprises a first crystallizer (1c) comprising an input (1) for receiving a liquid comprising the substance and an output (4) for discharging a slurry of liquid and crystals. The apparatus comprises also a first separator (1s) connected to the output 4 of the first crystallizer (1c) having a product output (2), and being with a residue output (5) connected to an input of a second crystallizer (2c), and a second separator (2s) being with an input connected to an output (6) of the second crystallizer (2c), a crystal output (7) of the second separator (2s) being connected to an input of the first crystallizer (1c).

Abstract: An apparatus for purifying waste streams having water, dissolved noxious substances and volatile organic compounds, comprising a distillation unit having distillate and bottoms products, a freeze-concentration unit and a processing unit. The distillate product is processed in the processing unit and the bottoms product is processed in the freeze-concentration unit, where purified water is extracted.