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Abstract
The effect of cyclic pressurized aeration on the activated sludge process is investigated in the present study. The COD removal of the wastewater treated under elevated pressure is moni‐tored in terms of the aeration time, maximum operating pressure and wastewater/sludge ratio. It is observed that within the range of parameters studied in the present work, the COD reduction increases steadily with increasing maximum operating pressure and aeration time and decreasing waste‐water/sludge ratio. The overall COD reduction of the present cyclic pressure aeration process is significantly lower than that of the corresponding constant pressure aeration counterpart for the maximum operating pressure up to 7.12 atmospheres. At a much higher maximum pressure, it is possible that the cyclic pressure aeration process may outperform the constant pressure aeration process. The cyclic pressurized aeration was also found to considerably improve the suspended solids removal.