Public works . ous to eliminate any dead areawhere digested sludge may collect and not mix withthe incoming fresh sewage. Capacities range to cubic feet per capita, averaging slightlyabove 1 cubic foot per capita. A capactiy of over 2cubic feet per capita is preferred. The bottom of the sludge chamber should be inthe shape of a cone or truncated pyramid and thegreater the slope of the walls of this chamber thebetter. The sludge chamber is usually divided intosquare compartments and sludge drawing facilitiesare provided for each compartment. The greatesttrouble with such a division
Public works . ous to eliminate any dead areawhere digested sludge may collect and not mix withthe incoming fresh sewage. Capacities range to cubic feet per capita, averaging slightlyabove 1 cubic foot per capita. A capactiy of over 2cubic feet per capita is preferred. The bottom of the sludge chamber should be inthe shape of a cone or truncated pyramid and thegreater the slope of the walls of this chamber thebetter. The sludge chamber is usually divided intosquare compartments and sludge drawing facilitiesare provided for each compartment. The greatesttrouble with such a division is that the good and badsludge do not mix properly. Attempts have beenmade to cut holes in the partition walls but this hasnot improved operation. Of course, the heavierlarger particles will settle in the primary compart-ment, with correspondingly poorer sludge in thesucceeding compartments. Reversing the flow helpsout the two end compartments but the good sludgein the central compartments does not mix with the. XARRriW (,. VENT WITH TROUGH IX WESTMONT fresh sludge. It hardly seems necessary to constructsuch division walls. Sludge Pipes: The average sludge i)ipe sizeis 8 inches. Care should be taken that the end ofthe pipe is neither too near nor yet too far from theconcrete side walls or bottom. If screens and gritchambers are used they should not become clogged. Scum Pipes or Troughs: Experience indi-cates that at practically all plants, scum collectsin large quantities in the gas vents. Usually thisscum is well digested and odorless and it can bedrawn off on the sludge bed. Due to the large gascontent it dries faster than the bottom sludge. Itis suggested that apparatus for removal of floatingsludge or scum be installed. Pipes or troughs canbe constructed at little additional expense and maybe a great saving in the end. This conveyor shouldbe constructed about 1 foot below the water level. Such a design has been followed in the constructionof the Haddonfield and Westmont
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
