COD was measured by closed reflux colorimetric
following Standard methods. The MLSS concentration
was measured by membrane filtration technique following
Standard methods in membrane filters with a pore
size of 0.45 mm [25]. pH and dissolved oxygen were
measured in a pH meter (WWT pH 330) and in an
oxygen-meter (WWT Oxi 330), respectively. VFA and
bicarbonate alkalinity were measured following the
methods proposed