MBBR--Moving bed biofilm reactor

Moving bed biofilm reactor (MBBR) is a type of wastewater treatment process that was first invented by Prof.
There are over 700 wastewater treatment systems (both municipal and industrial) installed in over 50 countries. Currently, there are various suppliers of MBBR systems.
The MBBR system is considered a biofilm process. Other conventional biofilm processes for wastewater treatment are called trickling filter, rotating biological contactor (RBC) and biological aerated filter (BAF). Biofilm processes in general require less space than activated sludge systems because the biomass is more concentrated, and the efficiency of the system is less dependent on the final sludge separation. A disadvantage with other biofilm processes is that they experience bioclogging and build-up of headloss
Some other advantages compared to activated sludge systems are:

Higher effective sludge retention time (SRT) which is favorable for nitrification
Responds to load fluctuations without operator intervention
Lower sludge production
Less area required
Resilient to toxic shock
Process performance independent of secondary clarifier (due to the fact that there is no sludge return line)

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