Download Biological augmentation of nitrifiers using the BABE

Biological augmentation of nitrifiers using the BABE-process
Contact:
Institute:
Status (aug2004):
Realization:
prof.dr.ir. Mark van Loosdrecht
Julianalaan 67, 2628 BC Delft
+31-15-278 1618
[email protected]
Delft University of Technology, Department of Biotechnology,
Environmental Biotechnology Group
1 full-scale plant under construction
DHV
Description
The nitrification capacity of an activated
Aeration tank
Settler
sludge process can be augmented by
Effluent
Influent
the addition of nitrifiers. These bacteria
are usually added as cell suspension.
An important disadvantage of adding
Return sludge line
bacteria in suspension is that they are
Return sludge fraction
susceptible to grazing by higher
to the BABE reactor
organisms,
and
not
necessarily
Effluent
adapted to the conditions of the actual
Reject water
BABE reactor
BABE reactor
treatment process. The so-called
Digester
BABE® technology, developed by DHV
Scheme illustrates the BABE concept
in co-operation with the TUD
overcomes this problem by producing
nitrifying bacteria into the activated sludge flocs. To achieve this, a limited amount of
activated sludge from the main process is recycled over the BABE reactor. This sidestream reactor is used to convert the ammonium in the filtrate of digested sludge.
BABE means "Biological Augmentation Batch Enhanced" and it is a new low-cost
method for N-removal in wastewater
treatment. The process works as an easy
way to upgrade WWTPs where aerobic
SRT is limited. The dual goal of the BABE
technology is the biological treatment of a
side-stream and augmentation of bred
bacteria to the main stream.
The BABE reactor in Garmerwolde
WWTP (350000 p.e.)
The process was tested at full-scale at the
WWTP of Garmerwolde (300,000 PE) in the
north of the Netherlands. . These experiments
on a full- scale have demonstrated univocally
the effective and stable operation of the BABE
technology. Besides FISH analysis revealed
that the type of bacteria cultivated in a BABE
reactor is the same type of bacteria that exists
in the main system.
References
Salem S, Berends D, van Loosdrecht MCM & Heijnen JJ. (2003). Bio-augmentation by
nitrification with return sludge. Wat. Res., 37(8), p1794-1804.
Salem S., Berends D., van Loosdrecht M.C.M. and Heijnen J.J. (2002). Model based
evaluation of a new upgrading concept for N-removal. Wat. Sci. and Tech., 45(6) p169-176.
Salem S., Berends D.H.J.G., van der Roest H.F., van der Kuij R.J., van Loosdrecht M.C.M.
Full-scale application of the BABE process. Accepted for the IWA Conference on Design,
Operation and Economics of Large Wastewater Treatment Plants (Praha, September 2003).
Berends D.H.J.G., van der Kuij R.J., Salem S., Uiiterlinde C. (2002). BABE-technologie
volwassen. H2O Dutch magazine, 19, 81-83.
Other webresources:
information by DHV