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A/O BAF system has been used in the treatment of nitrogen and phosphorus and other nutrients present in wastewater, This economical and effective way of nutrients removal uses different parameters in the actualization of desired objectives, one of them is the Reflux ratio, this research focuses on the influence and roles of Reflux, Sponge Iron and Manganese sand on the removal of nitrogen and phosphorus from wastewater. The following experimental operational parameters was set up for the purpose of this experiment, Hydraulic load of 0.5 m 3 / m 2 • h., Air/Water ratio of 10:1 (0.42L/min) and reflux ratio of 100 and 200 percent. The experiment is divided into two main areas: The effects of reflux ratio presence and absences on removal efficiency of the BAF system. The reflux water was introduced into the anaerobic column and sometimes in aerobic column. The results were examined to note the extent to which reflux plays a part on the removal rate of the nutrients when introduced into the aerobic column instead of the anaerobic column and vice versa. sponge iron and manganese sand column were also introduced, and the results of the nitrifying bacteria shown it supports the removal efficiency observed in the BAF system. The results were all investigated, compared and the analysis showed that reflux helped more in the removal of nitrogen and ammonia, while sponge iron and manganese sand increased the removal efficiency of phosphorus from waste water Key Word: BAF: Biological Aeration Filter; Total Phosphorus; Total Nitrogen; Chemical Oxygen Demand (COD);

REFLUX : IT'S IMPACT ON THE REMOVAL OF NITROGEN AND PHOSPHORUS FROM SEWAGE WATER USING ENHANCED AO BAF SYSTEM