EFFECT OF DIRECT THERMAL PRE-TREATMENT ON ANAEROBIC DIGESTION OF MUNICIPAL SOLID WASTESP.K. PRATAP CHANDRAN R.SARAVANAN AND S.RENGANARAYANANAbstract Organic content in segregated municipal solid wastes makes it a potential source of renewable energy by the Anaerobic Digestion route. One of the major constraints is the large residence time involved. Steam Digestion (Direct thermal pre-treatment) followed by Anaerobic Digestion could be a novel way to harness the Bio-Energy in solid wastes more efficiently and economically. The bio-degradability of the waste increases after the Steam Digestion due to the breaking up of large molecules and also due to the changes in internal composition. In the present study an attempt has been made to optimize parameters for Anaerobic Digestion after subjecting the waste to Steam Digestion. This Steam digestion was carried out at temperatures in the range 110°C to 150°C. The resultant slurry was cooled and filtered. The filtrate COD showed a reduction of 46% at the maximum temperature. The filtrate when subjected to Anaerobic Digestion showed a net increase in COD reduction 6.5%.
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