Cellulose-induced shifts in microbial communities and microbial interactions in an anoxic/aerobic membrane bioreactor

•Influent cellulose did not affect nutrient removal of the A/O MBR.•Influent cellulose lowered microbial polymer concentrations in the MBR.•Influent cellulose changed the microbial diversity and structure of the MBR.•Influent cellulose shaped cellulose and biopolymer metabolism associated taxa.•Influent cellulose affected keystone taxa and microbial interactions in the MBR.