This study investigated metal dynamics, and their bioavailability, before and after thermal pretreatment
of olive mill solid waste (OMSW), using a sequential metal extraction scheme. The 11.5% increase of
cobalt in the most available fraction after the pretreatment coupled to the increase of methane production
rate have been a good indicator that the OMSW anaerobic digestion might be metal limited due to
the lack of cobalt.