filter bed

A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

filter bed

1. (Civil Engineering) a layer of sand or gravel in a tank or reservoir through which a liquid is passed so as to purify it. Compare bacteria bed

2. (Chemistry) any layer of material through which a liquid is passed so as to filter it

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

fil′ter bed`

a pond or tank having a false bottom covered with sand and serving to filter river or pond waters.

[1870–75]

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Noun

filter bed - filter consisting of a layer of sand or gravel for filtering water

filter - device that removes something from whatever passes through it

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To perform a backwash, it is necessary to conduct previously filtered water through one or more filters of the filtration set, in the opposite direction of the filtration process (usually upward) with enough velocity to promote an adequate level of expansion and disturbance of the filter bed (Kau & Lawler, 1995; Turan et al., 2003; Ramirez et al., 2011).

Assessment methodology of backwash in pressurized sand filters/Metodologia de avaliacao do processo de retrolavagem em filtros de areia pressurizados

The project will improve the habitat of the country park off Junction 4 of the M42, including putting in three balancing ponds to manage the local flood plain and create an extensive filter bed system to cleanse the polluted rain water that previously drained off Stratford Road straight into the River Blythe.

Going with the flow

Key statement: The crumb rubber media are compressible which allows the porosity between rubber particles to decrease through the filter bed. The crumb rubber media compress as headloss increases, allowing for better effluent quality late in the run, allow greater depth filtration, can be used at high filter rates greater than 20 gpm/ft.

Method of using waste tires as a filter media

* Filter Bed -- This type of filtration system is comprised of a bed made up of either inert or active aggregrates.