The Moving Bed Biofilm Reactor (MBBR) process is a new wastewater treatment process that combines activated sludge (suspension growth) and biofilm method (fluidized attachment growth). The process was developed in the mid-80s of the 20th century, its principle is that the density is close to water, the suspension carrier filler is added to the aeration tank as a microbial growth carrier, the filler can be fully in contact with sewage after being fluidized through aeration, and the microorganisms are in the gas, liquid, and solid three-phase growth environment, at this time, anaerobic bacteria or facultative anaerobic bacteria grow in large quantities in the carrier, and the outside is aerobic bacteria, and each carrier forms a micro-reactor to make nitrification reaction and denitrification reaction exist at the same time.
The MBBR process combines the advantages of both the traditional fluidized bed and the biological contact oxidation method, and solves the problems of fixed-bed reactor need to be backwashed regularly, fluidized bed needs to fluidize the carrier, and the flooded biological filter is easy to clog and needs to clean the packing and replace the aerator. The process is referred to as a "mobile biofilm" due to the frequent contact between the suspended filler and the effluent.
The MBBR process is suitable for municipal and industrial wastewater treatment. Since the late 80s of the 20th century, MBBR has been put into use in more than 400 sewage treatment plants in 17 countries around the world, and has achieved good results. At present, the combined processes of MBBR in use include LINPOR MBBR series process and Kaldnes MBBR series process, which improve the traditional activated sludge method in terms of improving treatment effect and strengthening nitrogen and phosphorus removal.