Anaerobic treatment systems have been used widely for treating wastewater arising from agro processing industries. The typical treatment systems include; up-flow anaerobic sludge blanket reactor (UASB), anaerobic digester, fixed film reactor, anaerobic fluidized bed reactor and anaerobic baffled reactor. In this work, studies were carried out in an up-flow anoxic bioreactor using synthetic fertilizer wastewater for evaluating the denitrification efficiency using ethanol and topioca starch as carbon sources.