Anaerobic SBR (ASBR), which has a much simpler configuration than UASB, is a modified design of batch fed process. The major differences between ASBR and UASB are: (a) ASBR does not require feed distribution; (b) there is no three-phase separator in ASBR; and (c) an upflow hydraulic pattern is absent in ASBR system. As compared to UASB system, the non-continuous operation mode of ASBR is the major disadvantage. Wirtz and Dague (1996) successfully cultivated a granular sludge blanket with an ASBR in five months after seeding the reactor with nongranular primary digester sludge. Angenent and Sung (2001) found that MLVSS retained in ASBR is 2.5-fold higher than that in UASB, and the performance in term of COD removal in ASBR is comparable to that of UASB. The research conducted by Kennedy and Lentz (2000) also showed that at low OLRs, the performances of continuous UASB and anaerobic SBR were quite similar, but continuous UASB reactors performed more favorably than the anaerobic SBR at high OLRs.
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