Different physical, chemical and biological methods can be used to remove ammonia from aquatic environments. For this study, we used a plexiglass MBBR reactor. The useful volume of the pilot was 30 liters, in which the fluid-filled up to 46 cm of the reactor. Inside the pilot, the Kaldnes K3 type movable media and the polyethylene type with a total surface area of 584 m2 / m3 were used. After the pilot was completed, the entire research was carried out in three steps: (1) Start-up of the system and feeding with synthetic sewage for the purpose of biofilm formation. (2) Adaptation of the system and biofilm formation. (3) Inserting various organic loads and doing experiments. Three retention time, 4, 8 and 12 hours, and organic loading (COD) of 300, 500 and 800mg/l were used for this study. A large amount of information was obtained in this study including the removal efficiency of organic loading (BOD5, COD), nitrate and other items. Information on the optimal conditions for removing these pollutants was obtained. Also, there was a significant relationship between the removal efficiency of pollutants with pH, temperature, hydraulic retention time (HRT) and other parameters. Due to the fact that the country has suffered from a Drought and famine crisis, attention to the water cycle and the use of appropriate water treatment methods can be more and more important and one of the priorities of research in the field of environmental engineering.