The moving bed bioreactor (MBBR) fixed film process system uses thousands of special suspended biomass carriers designed to create a large surface area for biofilm growth, enhancing the biological wastewater treatment system without increasing the plant footprint. It can be used for both BOD5 and nutrient removal in municipal and industrial wastewater treatment plants.

MBBR systems can be installed in new plants and in existing plants, increasing capacity and nutrient removal without requiring additional tanks, which minimises upgrade costs and the project duration, as well as eliminating the need for additional space.

Features include a spiral roll mixing pattern, fine or coarse bubble aeration systems, non-clogging wedge-wire screens that retain the biomass carriers in the reactor, biomass carriers suspended in the aerobic zones of the reactor, stage partitions that create cascading reactors with optimal reaction rates and optimised biomass inoculation, a mechanically fixed denitrification reactor and aerobic reactors filled with biomass carriers.

MBBR systems can be installed either as an integrated fixed-film activated sludge system (IFAS) or as a fixed-film system without activated sludge circulation. It uses either fine or coarse bubble diffusers to provide complete aeration basin mixing, coupled with enhanced oxygen transfer.