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Title (Primary) Model experiments on improving nitrogen removal in laboratory scale subsurface constructed wetlands by enhancing the anaerobic ammonia oxidation
Author Paredes, D.; Kuschk, P.; Stange, F.; Müller, R.A.; Köser, H.;
Journal Water Science and Technology
Year 2007
Department UBT; BOPHY; UBZ;
Volume 56
Issue 3
Language englisch;
Keywords Anaerobic ammonia oxidation; Anammox; constructed wetlands; nitrite; nitrogen removal
Abstract Anaerobic ammonia oxidation (Anammox) has been identified as a new general process-strategy for nitrogen removal in wastewater treatment. In order to evaluate the role and effects of the Anammox process in wetlands, laboratory-scale model experiments were performed with planted fixed bed reactors. A reactor (planted with Juncus effusus) was fed with synthetic wastewater containing 150-200 mg L-1 NH+4 and 75-480 mg L-1 NO-2. Under these operating conditions, the plants were affected by the high ammonia and nitrite concentrations and the nitrogen removal rate fell within the same range of 45-49 mg N d-1 (equivalent to 0.64-0.70 g Nm-2d-1) as already reported by other authors. In order to stimulate the rate of nitrogen conversion, the planted reactor was inoculated with Anammox biomass. As a result, the rate of nitrogen removal was increased 4-5-fold and the toxic effects on the plants also disappeared. The results show that, in principle, subsurface flow wetlands can also function as an "Anammox bioreactor". However, the design of a complete process for the treatment of waters with a high ammonia load and, in particular, the realisation of simple technical solutions for partial nitrification have still to be developed.
ID 2142
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=2142
Paredes, D., Kuschk, P., Stange, F., Müller, R.A., Köser, H. (2007):
Model experiments on improving nitrogen removal in laboratory scale subsurface constructed wetlands by enhancing the anaerobic ammonia oxidation
Water Sci. Technol. 56 (3), 145 - 150