Adaptation of biohydrogen producing reactor to higher substrate load: Redox controlled process integration strategy to overcome limitations

► AcSBBR was adapted to increasing load (OL) of vegetable waste for H2 production. ► Stabilization in the performance was observed after OL, 26.44 kg COD/m3. ► Redox controlled process integration showed improved efficiency even at higher OL. ► This strategy improved both H2 production (42%) and substrate degradation (37%). ► This approach helps to check limitation of H2 production with high strength wastes.