Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . of porous tile, set in loose soil. Thetank is shown in detail in Fig. 152. It is a cemented brickcistern with an opening to the surface that contains a doublecover as a protection during cold weather. A brick partitiondivides the tank into spaces G and //, that contain volumes thatare to each other as 1 to 2. The tank is of such size as will holda volume of sewage equal to 24 hours use; that is, it is expected 172 MECHANICS OF THE HOUSEHOLD that any portion of sewage will remain in
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . of porous tile, set in loose soil. Thetank is shown in detail in Fig. 152. It is a cemented brickcistern with an opening to the surface that contains a doublecover as a protection during cold weather. A brick partitiondivides the tank into spaces G and //, that contain volumes thatare to each other as 1 to 2. The tank is of such size as will holda volume of sewage equal to 24 hours use; that is, it is expected 172 MECHANICS OF THE HOUSEHOLD that any portion of sewage will remain in the tank for that lengthof time. The sewage enters at A, in such a way as will give theleast disturbance of the liquid of the tank. An opening C allowsthe liquid to pass from H into G, where any additional sewageentering i? will displace an equal amount in G, which will passout at B to the filter bed. The partition D is high enough sothat the scum that forms on the surface will not pass directlyinto the space G, The entrance and exit pipes are made ofvitrified sewer tile with the openings below the Fig. 151.—Sectional view of a septic tank, connected with a sand-bed filter; forthe disposal of sewage from a residence. As the sewage enters the tank A, a considerable portion willsink to the bottom, while some will float to the top where a thickscum will gather. By far the greatest portion of solids will bereadily dissolved in the water and the remainder will be stillfurther reduced to liquid form by bacterial solution. The processof disintegration that goes on evolves a considerable amount ofcarbon dioxide and ammonia which filters through the process that now goes on in the tank is that of liquefying theorganic matter and changing it from organic to the inorganicstate. The bacteriologist recognizes in the process of sewage disin-tegration the work of two classes of bacteria, the aerobic or those SEWAGE DISPOSAL 173 bacteria that work by reason of air and do
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