but below the water surface. Water exited
the cell and flowed through a downcomer pipe to the bottom of Cell
2. This flow pattern was repeated for Cells 3 and 4. The flow rate to
the ABR was maintained at 1.2 L/min, resulting in an upflow velocity
of 0.36 m/h. The reactor was seeded with granular sludge
from a mesophilic UASB receiving brewing waste and began operating
in June 2012.