Sewage disposal . per minute to 5 pounds per square foot. The tank designed for sedimentation had a hopper bottomterminating in a cast-iron pipe 4 feet in diameter extending down-ward 24 feet below the bottom of the tank forming a sludge con-densation well. A 12-inch pipe inside the larger one extendedfrom near the bottom of the well to the top of the tank; and in-side this again was a 1-inch air pipe for forcing the sludge up tothe sludge activating tank or the presses. The ratio of air diffusing surface to water surface was 1 to capacity of the 8 aerating tanks was 360,000 gallons, o
Sewage disposal . per minute to 5 pounds per square foot. The tank designed for sedimentation had a hopper bottomterminating in a cast-iron pipe 4 feet in diameter extending down-ward 24 feet below the bottom of the tank forming a sludge con-densation well. A 12-inch pipe inside the larger one extendedfrom near the bottom of the well to the top of the tank; and in-side this again was a 1-inch air pipe for forcing the sludge up tothe sludge activating tank or the presses. The ratio of air diffusing surface to water surface was 1 to capacity of the 8 aerating tanks was 360,000 gallons, of thesedimentation tank, 33,000 gallons, and of the 2 sludge activatingtanks, 88,400 gallons, a total of 481,400 gallons. With a mixtureof 25 per cent of activated sludge, a 4-hour aeration period and a27-minute sedimentation period, 1,620,000 gallons per -day couldbe treated. With a 3-hour aeration and 20 minutes sedimenta-tion, 2,160,000 gallons could be handled. THE CONSTRUCTION OF AN ACTIVATED SLUDGE PLANT 395. Timber Pile6 SECTION E-E
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1919
