Sequencing batch dry anaerobic digestion of mixed feedstock regulating strategies for methane production: Multi-factor interactions among biotic and abiotic characteristics.

•The synergistic effects of multiple factors on SBD-AD were studied herein.•Attractive regulating strategies were developed based on feedstock ratio data.•The rate-limiting step in SBD-AD methane production is a low ammonia nitrogen level.•Comprehensive methane metabolic pathways are important for optimizing SBD-AD.•Significant differences in the microbial community were induced by feedstock type.