| 单词 | percolating filter |
| 释义 | > as lemmaspercolating filter percolating filter n. a type of filter used in the treatment of sewage, usually after the removal of suspended solids, consisting of a bed of inert, porous material such as crushed rock, through which the sewage is allowed to percolate so that noxious organic matter is removed by aerobic microorganisms. ΘΚΠ the world > physical sensation > cleanness and dirtiness > sanitation > provision of sewers > sewage treatment > [noun] > apparatus for sewage treatment septic tank1896 percolating filter1901 contact bed1902 trickling filter1903 bacteria bed1913 sedimentation tank1920 septic1929 comminutor1939 1901 S. Barwise Bacterial Purification of Sewage iv. 37 I have adopted the phrase ‘Percolating Filters’, instead of that of ‘Continuous Filters’, because some of the continuous filters are worked intermittently. 1948 L. E. H. Whitby Nurses' Handbk. Hygiene (ed. 8) iii. 73 The tank liquor is distributed slowly on to a ‘percolating filter’ made of clinker or stone, through which it slowly drains. 2002 BioCycle (Nexis) Apr. 83 A variety of biological treatment systems have been developed, ranging from cess and septic tanks to gravel beds, percolating filters and activated sludge processes. < as lemmas |
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