Septic Tank

The septic tank continues to serve as the wastewater disposal system for millions of households and numerous small industries, trailer parks, and recreation areas. Figure 7.21.11 is a typical flow sheet for a septic tank. The system combines settling and anaerobic surface disposal, usually by an open-jointed tile underdrain network. Seepage pits—covered pits lined with open-jointed masonry surrounded by gravel—are occasionally used instead of the

FIG. 7.21.10 Oxidation ditch flow sheets. A, Single ditch unit, B, Multiple ditch unit.
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