For
the first week, in addition to 1000 mg L−1 pyridine, 1000 mg L−1
acetate sodium was added into synthetic influent as supplementary
substrate for biomass growth stimulation. One week later, acetate
sodium in synthetic influent was reduced progressively, and finally
reduced to 0 mg L−1 on day 30. Thereafter, influent pyridine concentration
increased to 4000 mg L−1 step by step, while the cycle
time and settling time progressively decreased to 6 h and 2 min,
respectively.