The MBBR shows to be more stable when a FR of 40% is used, which allows a reduction of the HRT from 8 to 4 h, reaching a COD removal of 95%, allowing a reduction on the energy consumption, compared to the conventional processes.
Rusten et al. [5] used a MBBR pilot plant to treat dairy wastewater, reaching COD removal efficiencies above 85% for organic loads up to 500 g CQO/m3 h and a hydraulic retention time (HRT) of 7 h. A MBBR was also used to treat paper mill wastewater [6] with an organic matter removal efficiency of 98.7%. Vaidhegi [7] analyzed the same type of effluent and observed a maximum degradation when using 50% of FR in 8 h, pointing out that the filling ratio is an important factor because the organic removal depends on the biomass attached to the biocarriers.
For denitrification, anoxic Moving Bed Biofilm Reactor MBBR tanks are used. The anoxic tank is similar to aerobic Moving Bed Biofilm Reactor MBBR tank described above except that no oxygen is supplied. The tank contains no diffusers and the media is kept in suspension in the reactor through submersible mixers. Other feature such as the screen is the same as aerobic reactor although the design may be slightly different.
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.
PROCESS BENEFITS
Compact Design
A fraction of the size of conventional systems
Expandable
Capacity can be easily upgraded by simply increasing the fill fraction of biofilm carriers
Single Pass Process
No return activated sludge stream required
Load Responsive
Actively sloughed biofilm automatically responds to load fluctuations
Minimal Maintenance
No F/M ratios or MLSS levels to maintain
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