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- Title
Combining partial nitritation and heterotrophic denitritation for the treatment of landfill leachate previous to an anammox reactor.
- Authors
Ganigué, R; Gabarró, J; López, H; Ruscalleda, M; Balaguer, M D; Colprim, J
- Abstract
Landfill leachate can present extremely elevated concentrations of ammonium (up to 6,000 mg N-NH(4) (+) L(-1)) and a low biodegradable organic matter fraction. As an alternative to conventional systems, this wastewater can be treated on a more sustainable way by a fully autotrophic partial nitritation-anammox system. The operation of the first step of this system, the partial nitritation, is critical since the elevated concentrations of ammonium and nitrite in the reactor can severely inhibit ammonium oxidizing bacteria (AOB) activity. In this way, the inclusion of anoxic phases during the feeding events to promote the denitrification via nitrite can be a good option for upgrading the process performance and increasing the stability of the system. This paper deals with the evaluation of an anoxic-aerobic step-feed strategy for the operation of a partial nitritation SBR. Results of this study have revealed a decrease on the total nitrogen inside the reactor of more than 200 mg N L(-1) without prejudice on the partial nitritation process. Furthermore, this study has also allowed detecting an AOB activity reduction at the end of aerobic phases due to bicarbonate limitation and/or free nitrous acid inhibition.
- Publication
Water science and technology : a journal of the International Association on Water Pollution Research, 2010, Vol 61, Issue 8, p1949
- ISSN
0273-1223
- Publication type
Journal Article
- DOI
10.2166/wst.2010.968