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[Display omitted] • Bacillus sp. F3X3 and Paenibacillus sp. F1A5 have lignocellulolytic activity. • The inoculum and the substrate mixture for green waste composting were optimized. • The best mixture has 50% green waste and 35% food waste, with a C/N ratio of 27. • Lignocellulose degradation with inoculation was 1.6-fold higher than the control. The present study evaluates the effect of the mixing ratio of substrates and inoculation with lignocellulolytic bacteria on green waste (GW) and food waste (FW) co-composting. A Box-Behnken design was used to simultaneously optimize the lignocellulose degradation (%LD) and end-product quality. The best operational conditions were 4.85*105 CFU g−1 of Bacillus sp. F3X3 and 1.44*106 CFU g−1 of Paenibacillus sp. F1A5 with a substrate mixture containing 50% GW, 32.5% unprocessed FW, 2.5% processed FW, 13% sawdust, and 2% phosphate rock; with a C/N ratio of 27. Under these conditions, the %LD was 33% and the end-product has pH 8.3, TOC 22,4%, TN 1,7%, and a germination index of 103%. Therefore, the product complies with quality standards for organic fertilizers. The results of this study allow the identification of appropriate strategies to optimize GW composting, increasing the degradation of lignocellulose and improving the end-product quality. [ABSTRACT FROM AUTHOR]