CEBEDEAU • BeFlow: granular sludge metamorphosis - from applied research to upgrading activated sludge plants

Case study

BeFlow: granular sludge metamorphosis - from applied research to upgrading activated sludge plants

The problem

The aerobic granular biomass purification processes developed over many years are based on sequential operation (SBR). This sequential approach prohibits a continuous feeding of the biological reactor. However, the wastewater flow in some treatment plants is uninterrupted and the flow rate cannot be anticipated. Unless you have a huge buffer capacity, this process was not very suitable for municipal wastewater, which is why the vast majority of our plants operate in continuous flow.

The project

BeFLOW® is the second concrete result of the research carried out at CEBEDEAU on granular sludge, in partnership with the John Cockerill company. The research challenge was to succeed in developing granular sludge for activated sludge plants operating in continuous mode, with more diluted urban water. This did not exist at the time: in renovation, the only granular applications consisted of transforming conventional plants into sequential plants.

All this was developed over several years at CEBEDEAU on pilots of up to 500 L before being applied in real conditions on platforms of several tens of cubic metres.

The result

John Cockerill now offers a process that is particularly suitable for medium to large capacity municipal wastewater treatment plants (> 10,000 p.e.). They are positioning themselves on new installations and on increases in the capacity of existing activated sludge plants. In this case, they propose to convert the existing works to a BeFlow process, at a lower cost. The capacity increase on existing plants is in the order of +40 to +60%, depending on the partitioning constraints and the existing hydraulic line.

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