In-depth insight into improvement of simultaneous nitrification and denitrification/biofouling control by increasing sludge concentration in membrane reactor: performance, microbial assembly and metagenomic analysis

[Display omitted] •High sludge concentration simultaneously improved TN removal/biofouling control.•High sludge concentration drove microbial assembly for excellent MBR performance.•Microbial composition between bulk sludge and bio-cake displayed differently.•Up-regulated nitrogen metabolism and NAD...

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