Question 57General Subjects - 1st Asst/Chief

The correct answer is C) Seventy-five percent of the feed water entering the unit is removed as brine. In a distillation process, the majority of the feed water (typically around 75%) is removed as brine or concentrated waste, while the remaining 25% is collected as purified distillate. This is because the distillation process is designed to concentrate the impurities and minerals in the feed water, leaving the purified water behind. The higher the concentration of dissolved solids in the feed water, the more brine will need to be removed to maintain the efficiency of the distillation unit. The other options are incorrect because: A) The brine is not removed at a faster rate than the feed water entering; the process is designed to maintain a specific ratio of brine removal to feed water input. B) Twenty-five percent of the feed water is not removed as brine; the majority (around 75%) is removed as brine. D) The amount of brine leaving is not dependent on a specific device; it is a function of the overall distillation process design and the concentration of dissolved solids in the feed water.