W Waste water in Bantar Gebang contains nitrogen 1269.74 mg/1 on average for TIN and 1053.97 3-N for amoniac which endangers water body if it was not processed before consumption. At low pH, amoniac (NHS) in the water changes into amonium 4) having toxic featttre and endanger living creatures because it reduces oxygen solubility in water.SBR is group of reactors which is designed based on stream in flowing into each reactor continually. SBR is a reactor working in a cycle functioning as equalization tank, aeration and sedimentation and does not requires active sludge recirculation disined based on contual stream (batch).SBR reactor is in the form of sliced-pyramid completed with a hopper as the sludge storage, blower to distribute oxygen, mixing media to deposit the sludge during the dinitrification process and stream control as the waste water control in flowing into the SBR tank.This research was carried out for 2 semesters using Poly Uretlian in the form of cube and functioning as medium to attach the (suspended) microorganisms which enable to produce growth, maintenance and the death of the cells.Seeding was performed for 33 days and the VSS concentration is 7670 mg/l. Acclimatization was done for 7 days using 4600 VSS concentration mg/l. The variation made in this research is time variation, i.e. 3, 6 and 9 hours. In this research, nitrification efficiency in 3 hours is — 41% and - 1.8% and the denitrificatioon efficiency is -14% and 17% . At the variation time of 6 hours, the nitrification efficiency is —7% and 1% and the denitrification is 3% and - 66%. In the 9-hour operational condition, the nitrification effeciency is —2%, 0% and —8°» and the denitrification efficiency is 0%, -1% and —12%.The result of this research reveals that nitrification process did not occur in this research while the denitrification process took place with 3% -17% efficiency. The result of the identification of microorganism indicated that there are nitrosobacter and nitrosoinonas iii the waste water sample.