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lime softening
Lime softening, also known as Clark's process,〔Mellor, J W, Intermediate Inorganic Chemistry, Longmans, Green & Co, London, 1941, p. 202〕 is a type of water treatment used for water softening which uses the addition of limewater (calcium hydroxide) to remove hardness (calcium and magnesium) ions by precipitation. The process is also effective at removing a variety of microorganisms and dissolved organic matter by flocculation.〔(USBR - Lime Softening fact sheet )〕
==History==
Lime softening was first used in 1841 to treat Thames River water. The process expanded in use as the bactericidal effect of the process was discovered. Lime softening greatly expanded in use during the early 1900s as industrial water use expanded. Lime softening provides soft water that can, in some cases, be used more effectively for heat transfer and various other industrial uses.
In the USA, it is used primarily in the Midwest, Florida and Texas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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