What water treatment method removes ionized mineral salts by using ion exchangers?
A. Softening
B. Coagulation
C. Demineralization
D. Reverse osmosis
A. Incorrect. Softening is the treatment of water to remove dissolved mineral salts such as calcium and magnesium, known as hardness, in boiler feedwater.
B. Incorrect. Coagulation adds chemicals to reduce coarse suspended solids, silt, turbidity, and colloids through the use of a clarifier.
C. Correct. Demineralization is the removal of ionized mineral salts by ion exchangers.
D. Incorrect. Reverse osmosis uses pressure to remove dissolved solids from boiler feedwater by forcing the water from a more concentrated solution, through a semipermeable membrane, to a less concentrated solution.
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