16Sseq of metagenome
DNA from frozen bioreactor or inoculum (slurry) samples was extracted using the MagNA Pure LC DNA Isolation Kit III (Bacteria, Fungi) (Roche, Mannheim, Germany) following the manufacturers instructions. The hypervariable region V1V2 of the 16S rRNA gene was amplified (primers: F-AGAGTTTGATCCTGGCTCAG; R-TGCTGCCTCCCGTAGGAGT)