FRC Engineers use biological treatment primarily to remove biodegradable contaminants in wastewater. The FRC Moving Bed Biofilm Reactor (MBBR) biological treatment method uses small pieces of carrier material which are designed to maximize surface area and promote biomass growth. The MBBR tank is filled with these carriers, typically 30-70% by volume. The tank is aerated to feed the biomass and circulate the carriers throughout the tank, hence the ‘moving bed’ description. The bacteria grow on the carriers and consume contaminants, converting them to more biomass which can then leave the tank and be separated with a Dissolved Air Flotation (DAF) system or another form of clarification.

FRC uses MBBR technology to remove Biological Oxygen Demand (BOD) from wastewater, as well as to remove nitrogen and nitrogen-based compounds, phosphorous, and some forms of chemical oxygen demand (COD). MBBR systems are applicable in a wide variety of industrial and municipal applications.