Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . from the septic tank. The anaerobic filter is one in which anaerobic bacterial actionis given opportunity to reduce the organic matter in the sewageto its elemental condition. The filter may be constructed in anyform that will permit the process of filtration to be carried outin a Avay that will afford good anaerobic action. The extent to SEWAGE DISPOSAL 175 which the purification is to be carried will determine the form andsize of the filter. In Fig. 154 is shown such a plant, whe
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Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . from the septic tank. The anaerobic filter is one in which anaerobic bacterial actionis given opportunity to reduce the organic matter in the sewageto its elemental condition. The filter may be constructed in anyform that will permit the process of filtration to be carried outin a Avay that will afford good anaerobic action. The extent to SEWAGE DISPOSAL 175 which the purification is to be carried will determine the form andsize of the filter. In Fig. 154 is shown such a plant, where a combined septic tankand anaerobic filter discharges its effluent into a filter ditch inwhich the purifying process is continued through a bed of gravelof any desired length. The figure illustrates a plant that wasdesigned for a country residence. The septic tank and anaerobicfilter are located relatively as shown in the drawing, the filterditch following the course of a roadway. The water is finallydischarged into a little stream, where it mingles with the waterfrom a spring, and flows through a meadow.. SEPTIC TANK AND ANAEROBIC FILTER Genecal Arrangement of PlantFig. 154.—Sectional view of a septic tank combined with an anaerobic filter; to-gether with the details of construction and plan of arrangement. The septic tank in Fig. 154 is quite similar in construction to theothers described except that a section of sewer tile takes the placeof the brick wall between the two parts of the tank. The opening0, through which the effluent is discharged, is located a littleabove the center of the tank. The anaerobic filter is a tank, rectangular in cross-section, made with brick walls and cemented on the inside. The effluentfrom the septic tank enters the anaerobic filter in a chamber, thatis separated from the main tank by a wooden grating againstwhich rests the filter material. As indicated in the drawing, thebottom is filled with coarse material; stones or broken tiles 176 MECH