a layer of sand, gravel, or other porous material serving as a filter; a pond or tank incorporating such a layer.
| 单词 | θ61370 |
| 释义 | the world > physical sensation > cleanness and dirtiness > freedom from impurities > removal of impurities > filtering or percolating > [noun] > filter or percolator > others (5) filter bed1828 a layer of sand, gravel, or other porous material serving as a filter; a pond or tank incorporating such a layer. physeter1842 A filtering apparatus for liquids, in which a partial vacuum is created on one side of the filter, causing liquid to be forced through the filter… sack-filter1875 a form of filter used in sugar-refining (E. H. Knight Pract. Dict. Mech. 1875). biofilter1936 A filter or filtration device used for biofiltration. permeator1975 A vessel divided into two by a semi-permeable membrane, used esp. in the large-scale removal of solutes from a liquid by reverse osmosis. |
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