Improvements in or relating to the purification of water for consumption and of waste water

摘要

503,011. Filters. EAU ET ASSAINISSEMENT, ANCIENS ETABLISSEMENTS C. GIBAULT, and CHIDAINE, P. E. Aug. 23, 1937, No. 6580/39. Divided out of and addition to 502,962, under which a Specification was laid open to inspection under Sect. 91 of the Acts, Oct. 20, 1938. [Class 46] In the process of filtering drinking water or waste water, as described in the parent Specification, according to which the water is passed downwards through a bed of absorbent material on a perforated plate below which a reduced pressure is maintained by a suction device, so that air passes from top to bottom through the whole of the bed, the filtering-medium used may be in a finely-divided state, so as to afford a very large surface of contact to the liquid passing through it. The medium may be sand or pulverized coal, charcoal or clinker.