Effect of dissolved oxygen and carbon–nitrogen loads on denitrification by an aerobic consortium View Full Text


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Article Info

DATE

2000-10

AUTHORS

D. Patureau, N. Bernet, J. P. Delgenès, R. Moletta

ABSTRACT

Four samples of natural ecosystems and one sample from an activated sludge treatment plant were mixed together and progressively adapted to alternating aerobic/anoxic phases in the presence of nitrate in order to enrich the microflora in aerobic denitrifiers. Aerobic denitrifying performances of this mixed ecosystem at various dissolved oxygen concentrations and various carbon-nitrogen loads were evaluated and compared to those obtained with the aerobic denitrifier Microvirgula aerodenitrificans. The consortium and the pure strain exhibited an aerobic denitrifying activity at air saturation conditions (7 mg dissolved oxygen 1(-1)), i.e. there was co-respiration of the two electron acceptors with significant specific nitrate reduction rates. Dissolved oxygen concentrations had no influence on denitrifying performances above a defined threshold: 0.35 mg l(-1) for the consortium and 4.5 mg l(-1) for M. aerodenitrificans respectively. Under these thresholds, decreasing the dissolved oxygen concentrations enhanced the denitrifying activity of each culture. The higher the carbon and nitrogen loads, the higher the performance of the aerobic denitrifying ecosystem. However, for M. aerodenitrificans, the nitrate reduction percentage was affected more by variations in nitrogen load than in carbon load. More... »

PAGES

535-542

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002530000386

DOI

http://dx.doi.org/10.1007/s002530000386

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028385051

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11092629


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