Journal article
Nitrogen loss in a nitrifying rotating contactor treating ammonium-rich wastewater without organic carbon
- Siegrist, H. Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600 Dübendorf, Switzerland
- Reithaar, S. Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600 Dübendorf, Switzerland
- Koch, G. Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600 Dübendorf, Switzerland
- Lais, P. Sondermülldeponie Köllikon, CH-5742 Köllikon, Switzerland
Published in:
- Water Science and Technology. - IWA Publishing. - 1998, vol. 38, no. 8-9, p. 241-248
English
Extensive loss of nitrogen (up to 70% of ammonium oxidized) is observed in a nitrifying rotating biological contactor (RBC) treating ammonium-rich leachate from a hazardous-waste landfill site. Due to pretreatment (precipitation, flocculation, sedimentation, BOD removal, activated carbon adsorption), the DOC is less than 20 mg/l. Heterotrophic denitrification can therefore be excluded. The nitrification rate reaches 3-4 g NH4-N m−2 d−1 at a pH of 7-7.3 in the first two compartments of the three-stage RBC. An increasing partial pressure of oxygen and ammonium concentration favor nitrogen removal over ammonium oxidation. The reduction of nitrite might therefore be strongly coupled with ammonium oxidation. The degradation mechanism is not yet known. Two possibilities are suggested: (i) nitrite produced in the aerobic biofilm layer close to the surface diffuses into deeper anoxic layers of the biofilm and is reduced in parallel with ammonium oxidation similarly to the Anammox process, or (ii) nitrite produced by Nitrosomonas is reduced by NADH2+ generated during hydroxylamine oxidation.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.2166/wst.1998.0812
- ISSN 0273-1223
- Persistent URL
- https://sonar.ch/global/documents/93135
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