Small Scale Sewage Treatment, Cesspools, Bacillus Subtilis, Anaerobic Treatment System, Organic Molecules, Aerobic Oxidation

Small Scale Sewage Treatment

	Small Scale Sewage Treatment This essentially involves the sewage treatment in unsewered areas. Cesspools In many houses, human waste is dumped into cesspools. Cesspool is an underground construction consisting of concrete cylindrical rings with pores in the walls of the ring. Water passes out the bottom and through the pores into the surrounding sand whereas the solid waste accumulates at the bottom.
Anaerobic bacteria in the sludge layer at the bottom of cesspool digest the organic matter. The breakdown products diffuse into the ground. After few years, if the sludge becomes thicker it is necessary to clean with strong acid. Dried bacterial spores of Bacillus subtilis are available in stores. These may be added to accelerate the sludge digestion. Addition of yeasts at intervals is also useful. Septic Tank It is a water-tight masonry tank into which household sewage is admitted for treatment. It is a satisfactory means of disposing excreta and liquid wastes from individual dwellings, small groups of houses and institutions which have adequate water supplies but do not have access to public sewerage system. The location of a septic tank in a household. Septic tanks are settling tanks and are based on the sedimentation principle. They are plain single storeyed tanks.
It is the simplest form of anaerobic treatment system. It is a kind of sewage settling tank. It is an enclosed concrete box into which waste flows from the house. The organic matter accumulates at the bottom of tank whereas the water rises to the outlet pipes which empty into the surrounding area. The tank is to be pumped out regularly as there is no absorption of the digested organic matter into the earth.
Complex organic matter are anaerobically decomposed to simple organic molecules and fermentation gases. They are relatively small closed tanks vented for the escape of fermentation gases. The tank accomplishes two processes-sedimentation and biological degradation of the sludge which are achieved by anaerobic digestion and aerobic oxidation.

Index >> Waste Water Microbiology >>Small Scale Sewage Treatment

Small Scale Sewage Treatment