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Sludge, filter, Slud ge digestion, Secondary, settling, tank, Floating, Tank, Glass-covered, p+gas sludges-drying bed, cover, Sand, Sludge is, disgestion, by rotating, Dried sludge, is disposed off, Removes, humus, arm, treatment plant for large cities, NT PLANTS, cept in mind while giving layout of any sewage treatment, Returnal activated sludge, Skmming, tank, Primary, setting, tank, Grit, Racks, chamber, Aeration, tank, Sludge, digestion, Trickling, Final, Excess activated, Dried +, filter, tank, sludge, 1 disposal, settling, tank, sludge, Effluent, disposal, Fig. 12.4. Layout of sewage treatment plant., s should be arranged in such a way that minimum area is, ure economy in its cost., be occupied for future extension, in the beginning., Ce should also be provided near the treatment plants, so, ch the plants easily