. Bulletin of the Illinois State Laboratory of Natural History. Natural history -- Illinois. 181 connection with city water supplies, in sewers, near dung heaps, and in various places containing decaying organic matter. The equipment 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 9 feet deep and yYz 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 "
. Bulletin of the Illinois State Laboratory of Natural History. Natural history -- Illinois. 181 connection with city water supplies, in sewers, near dung heaps, and in various places containing decaying organic matter. The equipment 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 9 feet deep and yYz 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, jYi feet in diameter and 17 feet deep; a modified Dortmund tank, 7^ feet in diameter and 9 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 other. Shallow Seltlind Basin To Final Disposal. Sludge Digestion Jink To Fm&l Disposal To Final Disposal 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 State Laboratory of Natural History. Bloomington, Ill. : The Laboratory
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