sand filter

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• Sand filter — Sand filters are used for water purification. There are three main types; # rapid (gravity) sand filters # upflow sand filters # slow sand filters All three methods are used extensively in the water industry throughout the world. The first two… …   Wikipedia

• sand filter — …   Useful english dictionary

• Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… …   Wikipedia

• Rapid sand filter — The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal water treatment facilities. Rapid sand filters use relatively coarse sand and other granular media to remove particles… …   Wikipedia

• slow sand filter — A bed of sand through which water slowly flows; the gelatinous microbial layer on the sand grain surface removes waterborne microorganisms, particularly Giardia, by adhesion to the gel. This type of filter is used in some water purification… …   Dictionary of microbiology

• Filter (chemistry) — In domestic food and drink preparation where bulk solids are removed from liquids, this is often called a strainer. Filtrate is the liquid produced after filtering a suspension of a solid in a liquid.Filtrand (or Residue) is the solid residue… …   Wikipedia

• filter — I n. 1) to pass smt. through a filter 2) a cloth; sand filter II v. 1) (d; intr.) to filter into (foreign influence began to filter into the country) 2) (d; tr.) to filter through * * * [ fɪltə] sand filter a cloth to pass smt. through a filter …   Combinatory dictionary

• Filter [1] — Filter. Strömt eine Flüssigkeit so durch einen porösen Körper, daß die in ersterer enthaltenen Suspensionen dem letzteren durch Adhäsion verbleiben[26] oder sich vor demselben festlegen, so nennt man den Vorgang Filtration, den Körper das Filter… …   Lexikon der gesamten Technik

• Filter — Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may …   The Collaborative International Dictionary of English

• Filter bed — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English

• Filter gallery — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English