title: Bacterial 16S rRNA gene amplicon  of O3 consortium
design: Total genomic DNA extractions were carried out using ten milliliters of active enrichment culture samples according to the instruction of AxyPrepTM Bacterial Genomic DNA Miniprep Kit (Axygen Biosciences, CA, USA). The bacterial 16S rRNA genes were PCR amplified by primer sets 515F 5-GTGCCAGCMGCCGCGGTAA -3;907R 5-CCGTCAATTCMTTTRAGTTT-3.