Water Softening Plants - Lime softening

Water Softening Plants - Lime softening

Water Softening Plants - Lime softening

 The Lime Softening Process utilizes the addition of lime (calcium hydroxide) to remove hardness (calcium and magnesium) ions by precipitation. Softening is achieved by adding lime in the form of Ca(OH)2, which reacts first with CO2 to form calcium carbonate precipitate, and then reacts with multivalent cations to remove carbonate hardness, then reacts with anions to replace the non-carbonate hardness due to multivalent cations with non-carbonate hardness due to calcium. Lime softening process produces large volumes of sludge and as such is not used nowadays.