. Bulletin. Natural history; Natural history. 181 connection with city water supplies, in sewers, near dung heaps, and in various places containing decaying organic matter. The eciuipment of the Thirty-ninth Street Sewage Testing Sta- tion is as follows : a "grit chamber", 20X4X3 feet, with a capacity of 1,500 gallons at flow depth; three tanks, each 40 feet long, 7 to g feet deep and 73^ feet wide, total capacity 19,000 gallons, flow 17,000 gallons, tank "A" being an open septic tank with a nominal eight-hour period, tank "B" a closed septic tank, and tank "
. Bulletin. Natural history; Natural history. 181 connection with city water supplies, in sewers, near dung heaps, and in various places containing decaying organic matter. The eciuipment of the Thirty-ninth Street Sewage Testing Sta- tion is as follows : a "grit chamber", 20X4X3 feet, with a capacity of 1,500 gallons at flow depth; three tanks, each 40 feet long, 7 to g feet deep and 73^ feet wide, total capacity 19,000 gallons, flow 17,000 gallons, tank "A" being an open septic tank with a nominal eight-hour period, tank "B" a closed septic tank, and tank "C" an open settling tank; an Imhoff or Emscher tank, 7J/' feet in diameter and 17 feet deep; a modified Dortmund tank, 'jy2 feet in diameter and g feet deep; five sprinkling filters in cylindrical wooden tanks connected with the settling- and septic tanks, four being open and one covered; various settling basins; and a sludge digestion tank 29X7X6 feet, with a total capacity of 8,900 gallons. The following diagram will indicate the relation of these various tanks and filters to each Sludge Di^eslion lank To Final Dispt The one important thing to note in connection with the data which is to follow is the nature of the effluents of the various settling and septic tanks. In brief, the aim of modern sewage disposal involves two distinct steps: the disposal of the small amount of suspended mat-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
