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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