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Internal circulation (IC) of activated sludge anaerobic and anoxic/oxic processes was used to treat high carbon (C) and nitrogen (N) synthetic wastewater in order to achieve an effluent standard. The 1st & 2nd internal circulation anoxic (ICA) has shown a great advantage. Because under anoxic conditions heterotrophs utilize organic matter (OM). OM and NO3−-N are an electron donor and an electron donor, respectively. As a result, under conditions high carbon and NO3−-N, N2 production can generate higher than with 1st ICA BNR system only. Aerobic IC to anoxic, 1st ICA, and effluent IC to anoxic, 2nd ICA, could remove 100% of COD, 99.60% of TKN, and 99.90% of NH4+-N. The organic loading rate and NH4+-N loading rate are 68.38 kg-COD m−3 d−1 and 9.86 kg NH4+-N m−3 d−1, respectively in synthetic wastewater. Performance of these ICA activated sludge treatment was achieved the discharge standard with effluent COD less than 0 mg L−1,effluent NH4+-N less than 4 mg NH4+-N L−1, effluent NO2−-N less than 0.1 mg NO2−-N L−1, and NO3−-N less than 0.02 mg NO3−-N L−1

Removal of High C and N Contents in Synthetic Wastewater Using Internal Circulation of Anaerobic and Anoxic/Oxic Activated Sludge Processes