Science for beginners . center. Dosing chamber in foreground. Sewer inlet shownat far end. (Julietta, Ind.) (Courtesy of Chas. Brossman.) AA, Fig. 269). As the sewage passes through this settlingchamber, the solid matter settles through this opening into the 444 WATER SUPPLY AND SEWAGE DISPOSAL sludge chamber below. It is chiefly in the sludge chamberthat liquefaction or digestion takes place as a result of theaction of the anaerobic bacteria. This type of septic tankis considered superior because the contents of the sludgechamber are but slightly disturbed by, or mixed with, theconstant in-fl
Science for beginners . center. Dosing chamber in foreground. Sewer inlet shownat far end. (Julietta, Ind.) (Courtesy of Chas. Brossman.) AA, Fig. 269). As the sewage passes through this settlingchamber, the solid matter settles through this opening into the 444 WATER SUPPLY AND SEWAGE DISPOSAL sludge chamber below. It is chiefly in the sludge chamberthat liquefaction or digestion takes place as a result of theaction of the anaerobic bacteria. This type of septic tankis considered superior because the contents of the sludgechamber are but slightly disturbed by, or mixed with, theconstant in-flow of fresh sewage. The bacterial action is,therefore, more certain and perfect. 522. Sludge and Its Disposal.—Even when operating atits best, considerable insoluble material accumulates in thebottom of a septic tank. This accumulation is known assludge. Occasionally the sludge must be removed from aseptic tank. It is claimed that the Imhoff type of septic tankproduces a sludge more solid and more readily handled than. Fig. 271.—Contact niters of stone. (Julietta, Ind.) Sewage is dis-charged from tank, Fig. 270, to these beds. (Courtesy of Chas. Bross- man.) that produced by tanks of the type shown in Figs. 265 and266. Sludge from septic tanks is valuable as fertilizer. 523. The Complete Oxidation of the Sewage.—In theseptic tank only partial oxidation of the organic matter in thesewage ever takes place. While the outflowing sewage from DISPOSAL OF SEWAGE 445 the septic tank should be fairly clear and free from sediment,it still contains large amounts of undecomposed organic matterin solution. The methods followed and apparatus used toaccomplish the final and complete oxidation of the sewagedepends upon surrounding conditions and the amount ofsewage to be handled. If small amounts of sewage only areto be disposed of, and the character of the soil permits, thefinal oxidation may be accomplished by means of subsoildrains and underdrains only (Fig. 267). If large amountsof s
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921
