Anaerobic digestion of brewer’s spent grain with biochars—biomethane production and digestate quality effects

In this research, biochar (BC) made from the brewer’s spent grain at temperatures of 300, 450, and 600 °C was produced subjected to anaerobic digestion grain. BC shares 2, 5, 10, 50% concerning total solids substrate were tested three substrate-to-inoculum ratios 0.5, 1.0, 2.0, respectively. The process performed 37 took 30 days. For digestion, biomethane production recorded used for kinetics parameter determination according first-order model. After process, residues (digestate) analyzed fertilizing potential. yield differs 264 325 mL×g vs −1 , while parameters 292.7–344.7 0.08–0.11 d 24–42.5 mL×(g ×d) y max k r main factors affecting ratio share. No specific effect between types on found. An increase in share 2% SIR results improvement range 1.8% 10%. quality digestate (nutrients) inoculum quantity substrate. research complex showed that final supplementation depends not only properties, but also operational feedstock.