1.Introdution to Fixed bed reactor technology: The FBR (Fixed Bed Reactor) is a technology used to treat organic solvents in wastewater as well as inorganic substances such as H2S, sulfite, ammonia, nitrogen. Based on the activity of microorganisms that pollute organic matter to produce food for growth and development, the Fixed Bed Reactor (FBR) system integrates all three active sludge …