Biogas productivity by co-digesting Taihu blue algae with corn straw as an external carbon source

► Taihu blue algae are good feedstocks for biogas production. ► Co-digestion could be an option for efficient methane production and waste treatment. ► The increased methane production from co-digestion is attributed to synergistic effects. ► Increasing cellulase activity from corn straw could promote the methane production.