Shifts in microbial community structure of granular and liquid biomass in response to changes to infeed and digester design in anaerobic digesters receiving food-processing wastes

► We examined the microbiome in the granular and the planktonic fractions in two digester designs fed different infeed. ► Predominant bacteria and methanogens were identified in each fraction and the differences in microbiomes were documented. ► Feedstock and digester design could affect the microbiome established in digesters, with infeed having a greater impact. ► The finding might help operation of anaerobic digesters and future studies of the microbiome in anaerobic digesters.