A water treatment method that uses ion exchangers to remove all ionized mineral salts is:
a. deaeration
b. coagulation
c. reverse osmosis
d. demineralization
a. Incorrect. Deaeration removes oxygen or other gases from boiler feedwater by increasing the temperature and boiling out the dissolved gases.
b. Incorrect. Coagulation adds chemicals to reduce coarse suspended solids, silt, turbidity, and colloids through the use of a clarifier.
c. 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.
d. Correct. Demineralization is the removal of ionized mineral salts by ion exchangers.
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