Sewage disposal . 76,000 cubic feet(about per capita). During the autumn of 1916 the first eight of these tanks to becompleted were operated at double their normal rate to care forthe entire sewage flow while the remaining reconstruction wascompleted. The result of this heavy burden before the tankshad ripened was very bad foaming in the gas vents, with a dim-inution of efficiency from a 56 per cent removal of suspendedsolids in July to 13 per cent in November. At Alliance, Ohio (Pratt, 1918), an installation of three so-called septic tanks, built in 1910, has recently been modified byconv
Sewage disposal . 76,000 cubic feet(about per capita). During the autumn of 1916 the first eight of these tanks to becompleted were operated at double their normal rate to care forthe entire sewage flow while the remaining reconstruction wascompleted. The result of this heavy burden before the tankshad ripened was very bad foaming in the gas vents, with a dim-inution of efficiency from a 56 per cent removal of suspendedsolids in July to 13 per cent in November. At Alliance, Ohio (Pratt, 1918), an installation of three so-called septic tanks, built in 1910, has recently been modified byconverting one of the original tanks into six two-story tanks ofthe Imhoff type and making minor changes in the outlets of theoriginal tanks so that the sludge deposited in them could betransferred into the digestion chambers of the new tanks. Bythis plan, which is somewhat novel, the two original tanks wereretained for use as plain sedimentation tanks for treating part of IMHOFF INSTALLATIONS IN THE UNITED STATES 195. 196 PRELIMINARY TREATMENT IN TWO-STORY TANKS the sewage flow; while the remainder of the sewage was settledin the new two-story tank; and the sludge from all of the sewageis to be digested in these new tanks. Hence, the digestionchambers were of course made larger in proportion to the flowchannels than has usually been the practice in America. Operating Difficulties Experienced with Certain Imhoff In-stallations. Imhoff tanks were at first supposed to be free fromodors, yet the tendency of such tanks to foam at the gas ventsand to emit periodic whiffs or discharges of foul gases into theatmosphere has caused grave complaints at other places besidesBaltimore and Columbus and has led George W. Fuller to rec-ommend the substitution of fine screens for Imhoff tanks insewage designs at Cleveland, Indianapolis and Bridgeport, a recent paper Fuller (1918) has pointed out the specialliability to trouble in small plants treating domestic sewage be-cause of the large p
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