The Iowa Transit Volume 17-20

The Iowa Transit Volume 17-20

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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. 1912 edition. Excerpt: ... to secure sufficient purification. Overdosing which _is always an objectionable feature where calicum hy pochlorite is used is thus prevented or reduced to a min1II111II1. " The Iowa City Water Plant is privately owned, operating under a franchise from the city. It takes its water Supply chiefly from galleries under the Iowa River, but it is to a certain extent forced "to take water directly from the river. The proportion of river water n1iXel Wlth gallery Water varies with the amount of water available from the gallery wells and the immediate demand for water. The claim has been made, that, since the completion_if the University dam in 1906, the scouring action of the river has been lessened, and that silt deposited on the river bottom has so greatly reduced the filtration into the galleries from above, that the water in them is chiefly ground water. This water is high in iron, so that it favors the growth of the iron-secreting thread bacteria. Growths of crenothrix have been very troublesome. It was for this reason that the company installed an iron _ removal plant, which, with some modifications, is in use today. The plant will be found described in the Engineering Record, Volume 62, Page 102, (1910.) It was put in operation May 12, 1910. As originally constructed it consisted of a chemical house with lime solution and storage tanks, two covered sedimentation basins of 250,000 gallon capacity, four rapid sand filters, clear well, air blower, pumps, etc. It was constructed under contract with the New York Continential Jewell Filtration Co., at a cost of a bout $26,000. The modifications that have been made are the addition of apparatus for treating the water with aluminum sulphate before sedimentation and with calicum...
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Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236789806
  • 9781236789808