Influencing factors of phosphorus removal by novel integrated bioreactor

Based on the manual simulated domestic sewage as the treatment media, influence of dissolved oxygen (DO), carbon to nitrogen ratios (C/N), hydraulic retention time (HRT) at different feeding modes(feeding from anaerobic zone and anoxic zone respectively)on phosphorus removal was studied by the Integral OCO Process with the centerislandsettling tank. Satisfactory TP removal rate was obtained when DO is about 2.0 mg/L and it achieves 93% on average; also the satisfactory TP removal rate was obtained when C/N ratios is about 8.5 and it achieves 94% on average. The TP average removal efficiency increases first and then decreases along with the increase of HRT based on feeding from anaerobic zone, and the best TP removal efficiency is 92% when the HRT=12 h, the effluent TP is less than 0.5 mg/L. The TP average removal efficiency decreases along with the increase of HRT based on feeding from anoxic zone and satisfactory TP removal rate was obtained and it achieved 92% when HRT=4.8 h.