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The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974
In India, surnames are placed as last names or before first names, which often denote: village of origin, caste, clan, office of authority their ancestors held, or trades of their ancestors. The use of surnames is a relatively new convention, introduced during British colonisation.
Water closets could now empty into the cities sewer which in turn emptied into the Thames. [8] This was a disaster for the river. In 1816 salmon could be caught in the Thames, four years later none could be caught. The water closet overloaded the medieval cesspool system which was still in use. The use of water to dispose of sewage in the water ...
Water softeners, which use sodium ions to replace water-hardening minerals in water, were first introduced into the water treatment market in 1903. The theory of ion exchange involves replacing undesirable or potentially harmful ions with more desirable or harmless ones. This is implemented in domestic water treatment system as water softeners.
Process water is water that is used in a variety of manufacturing operations, such as: coating and plating; rinsing and spraying; washing, etc. Municipal and ground water often contain dissolved minerals which make it unsuitable for these processes because it would affect product quality and/or increase manufacturing costs.
Dalecarlia Water Treatment Plant, Washington, D.C. Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment.
The treatment process was conceived by John L. Leal and the chlorination plant was designed by George Warren Fuller. [47] Over the next few years, chlorine disinfection using chloride of lime were rapidly installed in drinking water systems around the world. [48]
Lists of the most common surnames by continent: Lists of most common surnames in African countries; Lists of most common surnames in Asian countries; Lists of most common surnames in European countries; Lists of most common surnames in North American countries; Lists of most common surnames in Oceanian countries