Grade 3&4 Water Treatment awwa ABC Questions and Answers Solved 100% Correct!!

calcium bicarbonate - A compount that is controlled through water treatment to prevent the formation of calcium carbonate. (Hardness) Ultraviolet disinfection - Disinfection using ultraviolet light membrane filtration - Water treatment process in which relatively pure water passes through a porous membrane while particles, molecules, or ions of unwanted matter are excluded Hardness - Caused primarily by salts calcium and magnesium Carbonate Hardness - hardness associated with bicarbonate noncarbonated hardness -Hardness caused by calcium and magnesium calcium carbonate - The principal hardness and scale causing compound in water Recarbonation - process of adding CO2 ion exchange - a process for softening water in which hard-water ions are exchanged for other ions Langellier saturation index - A measurement of the tendency of water to scale or corrode pipes based on pH, conductivity, hardness, alkalinity and temperatures Saturation - A stable condition of water in which the water will neither deposit scale nor cause corrosionChelation - A chemical process used to control scale formation in which a chelating agent captures scale causing ions and holds them in solution