120 days later, mature granules were observed in SBR, with
stable operation of the SBR achieved. In order to investigate the
effect of pyridine concentration on pyridine biodegradation in the
bioaugmented SBR, 1000–8000 mg L−1 pyridine was added into the
synthetic influent to make initial pyridine in SBR over the concentration
range between 500 and 4000 mg L−1.