2.3.2 Batch test II
4 L of pre-concentrated RAS from the inlet of the
pre-anoxic zone was put into a 5 L laboratory SBR
and stirred for 3 h. During the process, samples were
taken from the SBR every 15 min for 3
PO4− -P,
NO3− -N, and NO2− -N analysis, while pH and ORP
were measured by online probes .