Abstract: A liquid concentrating and solid drying machine in which a pair of heated drums with smooth surfaces disposed in side-by-side relationship project downwardly into a tank, one of the drums preferably being of a smaller size than the other and extending into the liquid in the tank when the tank is operating at a certain level and being disposed above the liquid when the tank is operating at a lower level. Liquid is discharged in the area of close proximity between the two drums, and when both drums are partially immersed in the liquid, they both operate to concentrate the liquid, and when the liquid level falls below the smaller drum, the large drum continues to operate as a liquid concentrating drum and the smaller drum operates as a drying drum.