Biogas production from brewery spent grain enhanced by bioaugmentation with hydrolytic anaerobic bacteria.

•The impact of bioaugmentation on methane production from spent grain was examined.•Methane production elevated for 17.8% with P. xylanivorans Mz5T bioaugmentation.•Bioaugmentation enhances the hydrolysis of brewery spent grain.•Changes in bacterial and archaeal communities were detected during biogas process.•Bioaugmentation enables successful biogas production from brewery spent grain.