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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.
Lime softening is the process in which lime is added to hard water to make it softer. It has several advantages [further explanation needed] over the ion-exchange method but is mainly suited to commercial treatment applications. [13]
A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
The necessity of repeated treatment requires continuous management and phosphorus monitoring to ensure optimal effectiveness. [citation needed] Biological implications are another important consideration of alum treatment. Treatments increase water clarity, which has been correlated with increased plant growth at greater depths within the lake. [8]
Soap scum or lime soap is the white solid composed of calcium stearate, magnesium stearate, and similar alkaline earth metal derivatives of fatty acids. These materials result from the addition of soap and other anionic surfactants to hard water .
Both quick- and hydrated lime are used in the treatment of drinking water. [10] Petroleum industry: Water detection pastes contain a mix of calcium oxide and phenolphthalein. Should this paste come into contact with water in a fuel storage tank, the CaO reacts with the water to form calcium hydroxide.
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