A Report to the Director of Public Improvements of the City of Columbus, Ohio, on the Proper Disposal of the Sewage of the City; Together with Plans and Estimates of Cost. Also Upon a Project for the Sewerage and Drainage of Volume 1-3

A Report to the Director of Public Improvements of the City of Columbus, Ohio, on the Proper Disposal of the Sewage of the City; Together with Plans and Estimates of Cost. Also Upon a Project for the Sewerage and Drainage of Volume 1-3

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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. 1899 edition. Excerpt: ...the following weights to the factors oper ating in a settling tank. Facoor. Importance. 1. Detention period 100 2. Change in temperature 30 3. Depth of tank 30 4. Construction of inlet and outlet 30 5. Character of sewage as fresh or septic domestic or manu facturing waste 30 6. Velocity of flow through tank provided it is less than 350 to 600 feet per hour 0 INLETS AND OUTLETS. Care must be exercised to prevent scum from forming in the inlets or outlets of tanks. In case curved pipes are used, the lower ends should be submerged to a depth that will allow them to discharge the sewage and collect the effluent below the level of the scum, and yet not deep enough to cause disturbance of the settled sludge. In some cases it may be necessary to alter slightly the design of the inlets and outlets in order to prevent accumulations. CLEANING. The length of time that any plant may operate without being cleaned depends entirely on local conditions. Some tanks have been in operation for two or more years, and the sludge deposit is not yet large enough to warrant its removal, while others fill with sludge so rapidly that it is necessary to clean them two or three time each year. Where sludge cannot be removed by gravity, the tank should be cleaned when the detention period has been cut down from 10 to 20 percent. Weather conditions should be taken into account in choosing the time of cleaning, for it is desirable to dry sludge as quickly as possible and remove it before rains undo the work of drying. APPEARANCE OF SLUDGE IN THE EFFLUENT. All plain septic tanks disgorge sludge from time to time and must be watched closely to prevent the fouling of the receiving watercourse or the clogging of the secondary treatment units. Sludge in the effluent of a...show more

Product details

  • Paperback | 98 pages
  • 189 x 246 x 5mm | 191g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236948262
  • 9781236948267