What water treatment method is the treatment of water to remove dissolved mineral salts such as calcium and magnesium?
A. Softening
B. Coagulation
C. Deaeration
D. Filtration
A. Correct. 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. Incorrect. Deaeration removes oxygen or other gases from boiler feedwater by increasing the temperature and boiling out the dissolved gases.
D. Incorrect. Filtration removes coarse suspended matter and sludge from coagulation or from water softening systems.
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