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Distance-based redundancy analysis (db-RDA) of microbial enrichment achieved in various sludge fractions (constrained inertia = 42.76%). Enrichment factors were constrained by facility types (TMWRF employing EBPR vs. STMWRF performing conventional treatment). Both facility operational condition (SRT) and sludge characteristic (DNA amount per gram of MLVSS) explained variations in enrichment (SRT: R2Adonis = 0.126, PAdonis = 0.085; DNA/MLVSS: R2Adonis = 0.302, PAdonis = 0.003).
