| 单词 | contact bed |
| 释义 | > as lemmascontact bed contact bed n. a tank containing porous material through which sewage is filtered in order that contact with the bacterial organisms and atmospheric oxygen in the pores of the material may chemically destroy the noxious organic matter in the sewage. 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 1902 Westm. Gaz. 18 Aug. 2/1 The contact bed treatment differs from the intermittent filtration method in that the sewage is rapidly run into a bed of cinders,..or the like, and after a few hours is as quickly run out. 1911 G. B. Kershaw Sewage Purification 226 Treatment of sewage in contact beds. 1936 E. H. Blake Drainage & Sanitation (ed. 5) xi. 428 Such treatment is carried out in what are often called Bacteria Beds. These may be on the intermittent principle, in which case they are called Contact Beds, or on the continuous flow principle, in which case they are called Percolating Filters or Trickling Filters; in either case the cause of purification is aerobic bacteria. < as lemmas |
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