Recently, the need for the removal of phosphorus and nitrogen increased due to many reasons including eutrophication control. Biological process could be reliable and economical N/P removal method from wastewater, however its removal mechanism and operating criteria were not well developed.
Objectives of this research are to find out the optimized operating strategy for $\underline{simultaneous removal of N/P}$, and their removal mechanisms and efficiency in SBR. Biological process of phosphorus removal from wastewater depends on the mechanism of phosphorus release during anaerobic period followed by phosphorus uptake during aerobic period. SPR (Specific Phosphorus-release Rate) was useful in estimating the phosphorus removal characteristics of sludge.
In this experiment the removal efficiency of phosphorus was above 95% where SPR was above 0.003 hr. Phosphorus removal efficiency was progressively enhanced over 4 months. Also the removal efficiencies of both TOC and nitrogen were 95% with the optimised operating strategy 2-hour-anaerobic-fill, 3-hour-aerobic, 3-hour-anoxic, and settle, draw and idle time of 4 hours in SBR.
