CHARACTERIZATION OF ANAEROBIC CO-DIGESTION PROCESSES USING LABSCALE BATCH TESTS

Anaerobic digesters for sludge stabilisation are often under-loaded and their performance in term of biogas production is poor. Co-digestion with suitable organic substrates, such as the sourcesorted organic fraction of municipal solid wastes (Bolzonella et al., 2006, Davidsson et al., 2007), food waste (Zhang et al., 2007), farm wastes (Alatriste-Mondragón et al., 2006), septage and slaughterhouse wastewater (Caffaz et al., 2005), has been suggested to improve biogas production and several successful full scale experiences are now operating in Italy.

In Italy, co-digestion appears to be an interesting solution to increase the biogas production of poorly performing under-loaded digesters of sewer sludge. In this context, simple and time effective procedures to roughly estimate the suitability of candidate co-substrates would be very useful. The present study was aimed at setting-up and applying a procedure to measure the anaerobic degradability of different organic substrates by short-term (4-7 days) lab-scale tests performed at very low food to biomass ratio to shorten the degradation process. Two complementary devices were used: OxiTop manometric system and the Challenge volumetric respirometer. Preliminary tests were carried out on acetate which showed a net biogas production close to the stoichiometric value.



Copyright: © IWWG International Waste Working Group
Quelle: Specialized Session D (Oktober 2007)
Seiten: 10
Preis inkl. MwSt.: € 10,00
Autor: S. Caffaz
Mauro Lombardi
Ing. Elena Ficara
Engineer Elena Bettazzi
Claudio Lubello

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