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Lime softening (also known as lime buttering, lime-soda treatment, or Clark 's process) [1] is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.
A combination of lime and soda ash, along with coagulant and flocculant chemicals, is added to raw water to promote a precipitation reaction. This allows softening to take place. Cold Lime Softening. Precipitation softening accomplished at ambient temperatures is referred to as cold lime softening.
21 sty 2017 · Lime water is a dilute solution of calcium hydroxide, $\ce{Ca(OH)2}$, in water. Soda lime is a mixture of sodium hydroxide, $\ce{NaOH}$, (also known as caustic soda) and calcium oxide, $\ce{CaO}$, (also known as quicklime).
The water is treated with lime or a combination of lime and soda ash (carbonate ion). These chemicals react with the hardness and natural alkalinity in the water to form insoluble compounds. The compounds precipitate and are removed from the water by sedimentation and, usually, filtration.
15 wrz 2021 · Drinking water softening is often implemented to increase consumer convenience e.g. by reducing lime scaling and soap use. Softening reduces hardness, but changes also the overall mineral composition of the water, depending on the technology.
30 sie 2023 · Pellet softening is a fluidized bed reactor technology for precipitation-based water softening. It uses caustic soda or lime to raise the pH of the water to create a precipitation reaction to reduce calcium in the water.
Chemical precipitation of hardness with lime and soda ash, commonly called lime soda softening, is used in most cases where surface water supplies are softened in public water supply treatment and in some softening of groundwater for public water supplies.
