MBBR Technology
 Description
Colloide’s Moving Bed Bioreactor System provides a highly effective treatment solution using biofilm to provide organic carbon removal and nitrification / de-nitrification where necessary.
The process is a highly reliable and robust solution for the removal of BOD and Nitrogen.
The process uses biofilm carriers in the treatment mixing tanks on which the biomass grows. Aeration then supplies the energy to disperse the carriers.
The process configuration designed for BOD removal is a once-through design, with 1 to 2 process stages in series, the number of stages determined according to the required effluent quality.
In this configuration, there is no sludge recycle to the aeration tank, and all of the biological activity takes place in the bio-film on the carriers.
The wastewater is delivered into the two stage aerobic tank system. The biofilm on the carriers break down the wastewater while air is fed into the base of each of the reactor tanks to provide oxygen for the biofilm while also providing mixing of the tank. The water exists each of the reactor tanks via a mechanical screen which is used to retain the carriers within each of the tanks.
When Nitrogen and/or nutrient removal is also required, the process will include a larger number of process stages, and an internal circulation of effluent to a pre-denitrification tank, but other than this, there is no sludge recycle from the solids separation unit.
The MBBR system can also be used in series with conventional activated sludge system or as a hybrid system with biofilm carriers used in the same tank as conventional activated sludge.
All of this leaves the MBBR system a highly flexible system whether for a new plant or the upgrade to an existing one.
MBBR configurations
This MBBR process can be used in a variety of configurations (standard MBBR, IFAS BNR etc) to achieve the necessary treatment.
Wastewater is treated only with carriers ie. no suspended biomass involved. This leaves a very simple process involving a once-through flow, no recycle for carbonaceous BOD removal, followed by solids removal eg. DAF unit, clarifier. More specialised process with internal recycles are used for nutrient removal.
Benefits of Colloide’s MBBR System
Very good effluent quality (20BOD/ 30SS/ Ammonia)
Low capital cost
Simple, robust design
Energy efficient
Ease of installation and operation
Capacity of existing works can be quickly and easily increased
Low operating cost
Small footprint for new works
Upgrade of existing works—simultaneously increase capacity and improve effluent quality
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