The Filtraflo Carb process consists of transferring raw water in a reactor, containing the filtering activated carbon bed and using an upflow stream.
The water circulates upward at a speed which does not allow the bed fluidization but causes the activated carbon to gradually migrate towards the bottom of the reactor.
The filtered water is collected at the top of the works into collecting troughs.
The activated carbon at the bottom of the filtering bed is continuously recirculated to the top via an air lift. Energy consumption is therefore very low.
This technique enables to permanently clean the recirculated activated carbon filled with suspended solids from the flocs and other impurities by some of the filtered water in a specific stack located towards the top of the works.
Having been recirculated and “washed,” the activated carbon is then ready to be reused in adsorbing micro-pollutants.
Extracted either continuously or at a set frequency, the activated carbon in the bottom of the bed is replaced by an equivalent quantity of new activated carbon at the top of the bed.
Once the activated carbon is removed from the works, it is sent to drain before ultimately going to a thermal regeneration unit.
Innovation: Micrograin carbon
One benefit of the Filtraflo Carb process is its use of activated carbon in microgranules.
Once removed, the micrograin active carbon undergoes a simple draining and is then stored before being carried to a thermal regeneration unit. This means that the same material can be reused multiple times. Water treatment plants using Filtraflo Carb do not require any specific sludge treatment.
This real alternative reduces operating costs by avoiding the spreading of activated carbon sludge and related costs (transport, spreading or landfilling).