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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.
MBBR systems don't need a recycling of the sludge, which is the case with activated sludge systems.
The MBBR system is often installed as a retrofit of existing activated sludge tanks to increase the capacity of the existing system. The degree of filling of carriers can be adapted to the specific situation and the desired capacity. Thus an existing treatment plant can increase its capacity without increasing the footprint by constructing new tanks.
When constructing the filling degree can be set to, for example, 40% in the beginning, and later be increased to 70% by filling more carriers. Examples of situations can be population increase in a city for a municipal wastewater treatment plant or increased wastewater production from an industrial factory.
Some other advantages compared to activated sludge systems are:
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Higher effective sludge retention time (SRT) which is favorable for nitrification
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Responds to load fluctuations without operator intervention
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Lower sludge production
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Less area required
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Resilient to toxic shock
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Process performance independent of secondary clarifier (due to the fact that there is no sludge return line)
This technology provides cost-effective treatment with minimal maintenance since MBBR processes self-maintain an optimum level of productive biofilm. Additionally, the biofilm attached to the mobile biocarriers within the system automatically responds to load fluctuations.
Conclusions
1. The MBBR is a well‐proven, robust and very compact technology
(Now altogether > 800 plants in > 50 countries – 50/50 industrial/municipal).
2. The MBBR is used in pure biofilm processes as well as in hybrid processes (IFAS)
3. The combined pre‐ and post denitrification MBBR process is especially suitable
for low C/N waters and offers great flexibility in operation
4. The MBBR is very efficient in the upgrading of activated sludge plants:
a. as "roughing" reactor before AS in order to reduce organic matter loading
b. in an IFAS‐process in order to achieve: nitrification, N‐removal and or P‐removal
5. The MBBR‐based processes are especially suitable for developing special
cultures – for instance for:
a. N‐removal by anammox processes
b. Organic micropollutants removal
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