Units also may be fired directly with oil, gas or methane. The warmed brine enters the evaporation chamber. Airflow into evaporation chamber drops the vapor pressure and the vaporization temperature of the warmed brine. Wastewater is partially vaporized. As wastewater vaporizes, salts and other solids collect on membrane surfaces in the evaporator.
Vibration causes solids to regularly peel into a collection system for removal.
The cool brine remaining after vaporization is reheated in the heat exchanger and the process repeats.