Proceedings of the Annual Convention of the American Water Works Association, Volume 8-10

Proceedings of the Annual Convention of the American Water Works Association, Volume 8-10

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 edition. Excerpt: ...in so minute a manner as to allow the water to pass only in a restricted and divided manner into the filter bed underneath. The advantage claimed for this arrangement is, that it relieves the filtering material of any excessive pressure, which a large body over it would cause, but as the capacity of filtering of a given bed must necessarily vary as the bed becomes clogged, the surplus water must accumlate on top of the filtering material. The water from the upper reservoirs passes downward through the filter bed and enters still lower down and separated from the latter, into the channel into the large reservoir immediately underneath. The water, percolating into space, is thus exposed to the oxidizing effect of the atmosphere, which is certainly a valuable feature of the West Filter. There remains yet ' another distinguishing feature in the West Filter, namely, that it is placed under a roof, thus preventing the action of the rays of the sun having an injurious eflfect on the water. This idea is, however, only applicable in the case of small filters. Coming now to the manner of cleaning the filtering material in the West System, the most important feature in any filter, there seems no further provision made than for the actual bodily removal of the filtering material, charged with inter.epted matter, each time the filter bed needs cleaning. For this removal however, every facility is made by way of hoists and tramways. In this system, it will be noted also, that there is no provision made for injecting clear water under pressure to, dislodge and dissolve intercepted matter. nor are there any means to collect the filth charged water, neither is there any local mechanical appliance to hasten this cleaning process as is the case in...show more

Product details

  • Paperback | 212 pages
  • 189 x 246 x 11mm | 386g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236905709
  • 9781236905703