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A fill-and-draw reactor is a single reactor in cyclic operation :
It is clear that the water level in the reactor cannot be constant and that continuous feeding is not possible.
On the other hand, the fill-and-draw reactor allows wastewater feeding into a reactor with a relatively high substrate concentration. In these conditions, the so-called floc forming bacteria grow much faster than the filament forming bacteria. These floc forming bacteria tend to settle much more easily than the filaments (better sedimentation).
In a conventional system, the substrate concentration is lower and this means that the filaments tend to dominate. This leads to less easily settling sludge. To solve this problem, a conventional system sometimes uses a separate so-called selector tank in which the influent is mixed with the highly concentrated recycled sludge.
Easy and compact construction
Control in time
Selection of well settling sludge (= 'integrated selector effect')
Quiescent settling conditions.
Discontinuous influent feeding and effluent discharge
The variable level and volume
Complex moving equipment
SEQUENCING BATCH REACTOR (SBR)
There is a fairly simple way to make a fill-and-draw system continuous: place several fill-and-draw reactors (each operating in batch mode) in parallel, in such a way that always at least one reactor is in 'fill' mode and one in 'draw' mode. This way, some of the advantages of the fill-and-draw system are maintained, on the other hand this method retains some of the disadvantages of fill-and-draw (variable level) and of the conventional system (several reactors).
Waterleau Lucas® system merges the fill-and-draw (time control) and conventional system (place control), combining the advantages of both systems and eliminating the disadvantages.