Sewage disposal . umi-noid N. Nitrites. Sewage 1109 957 14 259117 54 Imhoff effluent Per cent Parts per million. Nitrates, Oxygen con-sumed. Alka-linity. Chlorine. Dissolvedoxygen. Bacteria per cubic centimeter at 20°. Imhoff cent removal. 1259226 259 267 194170 1,461,000 1,291,000 12 Removal of aettleable solids, 80 per cent. IMHOFF INSTALLATIONS IN THE UNITED STATES 191 It is evident that the moisture content of Imhoff sludgesvaries widely at different American plants. We have notedmoisture contents of 74 pe
Sewage disposal . umi-noid N. Nitrites. Sewage 1109 957 14 259117 54 Imhoff effluent Per cent Parts per million. Nitrates, Oxygen con-sumed. Alka-linity. Chlorine. Dissolvedoxygen. Bacteria per cubic centimeter at 20°. Imhoff cent removal. 1259226 259 267 194170 1,461,000 1,291,000 12 Removal of aettleable solids, 80 per cent. IMHOFF INSTALLATIONS IN THE UNITED STATES 191 It is evident that the moisture content of Imhoff sludgesvaries widely at different American plants. We have notedmoisture contents of 74 per cent at Akron; 91 per cent at Chi-cago; 85 per cent at Cleveland; and 87 per cent at and Eddy (1916) cite records of 92 per cent at Worces-ter, and 87 per cent and 90 per cent respectively at the twoAtlanta plants. Imhoff Installations in the United States. The acceptance ofthe Imhoff tank as a practical method of sewage treatment hasbeen almost as rapid in this country as in Germany, in large. Fig. 55. Plan of Rectangular Imhoff Tank at Rochester, N. Y.(courtesy of C. A. Poole). measure as a result of the leadership of Rudolph Hering. In1916 according to Dr. Imhoff 170 tanks of this type had beendesigned in Germany to serve a total population of 3,000,000, ofwhich 130 were in actual operation, while 70 plants had beendesigned in the United States to serve a total population of600,000 with over half of the plants in operation. Among themost interesting of our installations are perhaps those at Roches-ter, Baltimore, Atlanta, Fitchburg and Columbus. The Rochester tanks are excellent examples of the rectangulartype of construction which has met with most favor in this 192 PRELIMINARY TREATMENT IN TWO-STORY TANKS country. The tanks (Poole, 1915) are designed in units, each unitto handle the sewage of 40,000 persons after preliminary treat-ment by 2-inch and half-inch screens and detritus tanks. Eachunit (see Fig. 55) consists of two tanks placed side by side,
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