2.2. Operation strategy
The combined UASB and MBR system was operated for 220 days
prior to the start of this research; before day 0 the system was fed
with low-strength semi-synthetic wastewater and the results are
presented elsewhere [17]. The present study was performed over
292 days and the operation can be divided into three different
periods:
Period I (from day 0 until day 32). During this period, the recirculation
pump from the first chamber of the MBR stage to the UASB