The presence of large amounts of phosphorus in wastewater is one of the primary causes of eutrophication, which has a detrimental impact on many natural water bodies. Prior to discharge to the stream, wastewater treatment plants should remove phosphorus from the effluent. In this study, (POC) is used as submerged attached growth systems to be introduced into the aeration tank of activated sludge systems which was evaluated for the removal phosphorus PO4 from synthetic wastewater. The experiments were conducted into different influent flow rates ranging from 5, 10, 15, 20, 25, and 30 L/d. Sampling was conducted every two days from the influent and effluent points. Parameters such as Phosphorus were monitored. Generally, PO4 was highly removed. The average removal of PO4 reached 88 for reactor A while 77 for reactor B with flowrate 5L/d. While for the first order kinetic model the substrate removal rate (K1) was found as 5 and 3.9 per day with a correlation coefficient (R2) of 0.9721 and 0.9718 for reactor A and B, respectively. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.