In recent years, sequencing batch reactor (SBR) has been
employed as an effective technology for industrial and municipal
wastewater treatment, because of its simple single tank configuration
and high efficiency in BOD and SS removal (89e98% and
85e97%, respectively) (Mahvi, 2008). SBR is an improved version of
activated sludge system and the term SBR stems from the sequence
of its steps which occur within the same vessel: filling, aeration,
settling and decantation. Its design is simple yet produces high
quality effluent, since the system acts as an equalization tank,
reactor as well as a clarifier. The flexibility in operation reduces
costs without sacrificing effluent quality