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Waste Management & Research, Vol. 11, No. 5, 403-414 (1993)
DOI: 10.1177/0734242X9301100504

Digesting the Organic Fraction of Municipal Solid Waste: Moving From Mesophilic (37°C) To Thermophilic (55°C) Conditions

F. Cecchi

Department of Environmental Sciences, University of Venice, Calle Larga S. Marta 2137, 30123 Venice, Italy

P. Pavan

Department of Environmental Sciences, University of Venice, Calle Larga S. Marta 2137, 30123 Venice, Italy

A. Musacco

Department of Environmental Sciences, University of Venice, Calle Larga S. Marta 2137, 30123 Venice, Italy

J. Mata Alvarez

Department of Chemical Engineering, University of Barcelona, Marti y Franquez 1/6 08028, Barcelona, Spain

G. Vallini

Centre for Soil Microbiology, National Research Council (CNR), Via del Borghetto 80, 56124 Pisa, Italy

This paper shows the possibility of moving in a matter of weeks from mesophilic (37°C) to thermophilic (55°C) conditions in the anaerobic digestion of the organic fraction of municipal solid waste (MSW) at high levels of solids (20%). After the temperature increases, a first pseudo steady-state condition can be reached after a month and a final steady-state condition after 2 months. No particular evidence of digester instability was observed using this approach in changing temperature range. The higher yields obtained in the latter condition (110% larger in terms of specific production) are shown.

Key Words: Anaerobic digestion • thermophilic • mesophilic • solid waste • organic fraction of MSW.


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