A manual of hygiene and sanitation . Tiy Pass - Outlet P^pe* Inlet Pipes - Sedimentation Blow Off =0Basin Supply to Filters * Plan of filter-beds at Albany, N. Y,. for the controlling of the depth of water upon the surface,rate of flow of the filtrate, cleaning of filters, etc. () Such filters act primarily as strainers to remove thesolid impurities from the water, but their efficiency ismuch increased by the sediment that is retained uponthe surface of the sand and that forms a filter or^ blanket ^ much finer than the latter and is capable ofmechanically preventing the passage of most
A manual of hygiene and sanitation . Tiy Pass - Outlet P^pe* Inlet Pipes - Sedimentation Blow Off =0Basin Supply to Filters * Plan of filter-beds at Albany, N. Y,. for the controlling of the depth of water upon the surface,rate of flow of the filtrate, cleaning of filters, etc. () Such filters act primarily as strainers to remove thesolid impurities from the water, but their efficiency ismuch increased by the sediment that is retained uponthe surface of the sand and that forms a filter or^ blanket ^ much finer than the latter and is capable ofmechanically preventing the passage of most of the 1 Filtration of Public Water-supplies. FUNCTIONS OF SEDIMENT-LAYER. 183 bacteria always present in a surface-water. Moreover, thisremoval of the bacteria is often largely due to the organ-isms themselves in the sediment-layer, because by forminga felt-like growth therein they not only increase the fine-ness of the strainer, but by acting as saprophytes theyalso decompose much of the organic matter and even killthe pathogenic bacteria. However, it now seems probablethat for continuous filters the action is sometimes mainlymechanical, consisting in the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, bookyear1903
