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Microfiltration. Microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane filter to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmosis ...
Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters almost always ...
Berkefeld filter. A Berkefeld filter [1] is a water filter made of diatomaceous earth ( Kieselguhr ). It was invented in Germany in 1891, and by 1922 was being marketed in the United Kingdom by the Berkefeld Filter Co. [2] Berkefeld was the name of the owner of the mine in Hanover, Germany, where the ceramic material was obtained.
The association estimated in a report last year that it would take $157.5 billion to bring nonfederal U.S. dams up to par. That pertains just to today’s safety standards — it does not factor ...
Paramount's future looks as uncertain as the ending to a blood and guts horror movie."I will say Paramount as a company is quite impaired at this point," Candle Media co-founder Kevin Mayer told ...
High-ranking military officials from the U.S. and its top African allies watched intently as dust and flames shot up from pieces of the Sahara Desert hit by tank and artillery fire. The practice ...
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