Composting as digestate post-treatment: composting behaviour and gaseous emissions of three types of digestate compared to non-digested waste
Résumé
In the actual context of French regulation, anaerobic digestion products are still considered as waste and cannot be valorised as product unless being composted. Nevertheless digestates specificities concerning composting treatment have to be thoroughly studied. Thus the present work compared the composting behaviour of digestates with their non-digested waste. Three origins were considered: agricultural waste, source sorted organic fraction of municipal solid waste and mechanically sorted organic fraction of municipal solid waste. Whatever the origin of the waste, biodegradation rate of digestates during composting was lower than the one of the non-digested waste. Temperatures reached during composting were also lower than for non-digested waste even if the produced heat permitted to dry the treated digestates anyway. Composting behaviour mainly differed from one digestate to the others considering biodegradation kinetics and trends of GES and ammonia emissions.
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