HIGHLIGHTS • Molecular composition of solid-state anaerobic digestates of pig slurry and straw studied by Py-GC/MS • Highest OM loss found when using 2 and 4 percolate recirculation per day • Greater polysaccharides consumption found when increasing recirculation frequency • Enrichment in Lig-compounds found when increasing recirculation frequency • Positive effect of percolate recirculation on OM degradation and stabilization
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