Progress Report of Public Health in Wisconsin Volume 16
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Progress Report of Public Health in Wisconsin Volume 16

Progress Report of Public Health in Wisconsin Volume 16


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...was not doing the work in a satisfactory way, but the cause of the inefficiency was not so easy to fathom at this time with' the meager data that the author had at command. The marked turbidity of the unfiltered water during the spring months was occasioned by the breaking up of the ice and the Purification of Sand Filtration. severe winds that prevailed at this time sufficed to disturb the water of the entire bay. On this account the filter surfaces were soon clogged, necessitating a "skimming" or removal of the superficial half inch or more at very frequent ini tervals. The efficiency of a sand filter in removing microbic life is dependent in large part, as previously noted, upon the formation of a slimy surface coat on the superficial stratum of sand. This is due in part to the slow accumulation of organic matter that is strained out from the passing water and when once formed, tins jelly-like mass permits the passage of the water but holds back almost all organic matter. If, however, this slime coat is disturbed, or if it accumulates to such an extent that it becomes necessary to remove the same, then the continuity of the retaining coat is destroyed and the sand layers become filled with bacteria, many of which pass through into the effluent. The severe conditions imposed upon the Ashland filtering system by reason of the extremely fine clay in the bay water necessitated a very frequent skimming of the surface, and it was suggested to the water company that the failure of the filter to properly perform its work was occasioned by the frequent disturbance of the filtering surface. At this time it was learned that only two of the filter beds' (1-3 of an acre) had been put into actual operation, the third; being used for a storage reservoir in ca...


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Product Details
  • ISBN-13: 9781236243096
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236243099
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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