title: 16S (V4) marker-gene survey of integrated fixed-film activated sludge wastewater treatment controls: Extraction blank, associated with WWTP A samples, DNA extraction round 11
design: DNA extraction was carried out without sample addition using a Mo Bio PowerSoil DNA extraction kit, and PCR amplified using the 515FB-806RB primer set (Walters, et al. 2015. mSystems https://doi.org/10.1128/mSystems.00009-15) targeting bacteria and archaea.  A two-step library preparation was used including the incorporation of illumina overhang adapters onto locus-specific PCR primers, followed by a second round of PCR to add sequencing adapters and sample barcodes using an Illumina Nextera XT Index Kit.