“…The methanogenic reactor was inoculated with the anaerobically digested sludge coming from the full-scale mesophilic digester of Treviso WWTP (Da Ros et al, 2017) and maintained under thermophilic temperature (55 C) for about 1 month, as it was for the first fermentation reactor. The methanogenic reactor was daily fed with the effluent from the first stage.…”