R1, control SBR, with no
extra bacteria addition; (2) R2, bioaugmented SBR, seeded with
3 g PCN bacteria made in 2.1. The operation was divided into two
phases, first phase (0–20 d): both reactors were fed with raw
wastewater; second phase (21–53 d): sodium succinate was used
as the extra carbon source and directly added to the reactor at
the beginning of every aeration period. The pH and DO values were
monitored at a regular time interval during the operation.
For long operation of reactor R2, 50 g of sodium succinate was
directly added to the reactor at the beginning of every aeration
period. The solid retention time (SRT) of reactor R2 was kept at
12–15 d and the mixed liquor suspended solids (MLSS) in the main