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Nitrification-denitrification in WSP: a mechanism for permanent nitrogen removal in maturation ponds

Camargo Valero, M.A., Read, L.F., Mara, D.D., Newton, R.J., Curtis, T.P. and Davenport, R.J. (2009) Nitrification-denitrification in WSP: a mechanism for permanent nitrogen removal in maturation ponds. In: 8th IWA Specialist Group Conference on Waste Stabilization Ponds, 26 - 29 April 2009, Belo Horizonte/MG Brazil. (Unpublished)

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Abstract

A pilot-scale primary maturation pond was spiked with 15N-labelled ammonia (15NH4Cl) and 15N labelled nitrite (Na15NO2), in order to improve current understanding of the dynamics of inorganic nitrogen transformations and removal in WSP systems. Stable isotope analysis of δ15N showed that nitrification could be considered as an intermediate step in WSP, which is masked by simultaneous denitrification, under conditions of low algal activity. Molecular microbiology analysis showed that denitrification can be considered a feasible mechanism for permanent nitrogen removal in WSP, which may be supported either by ammonia-oxidising bacteria (AOB) or by methanotrophs, in addition to nitrite-oxidising bacteria (NOB). However, the relative supremacy of the denitrification process over other nitrogen removal mechanisms (e.g., biological uptake) depends upon phytoplanktonic activity.

Item Type: Conference or Workshop Item (Paper)
Keywords: 15N stable isotopes; denitrification; maturation pond; nitrification; nitrogen removal; tracer experiments
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds)
Depositing User: Ms Caroline Wilson
Date Deposited: 22 May 2009 15:42
Last Modified: 08 Feb 2013 17:06
Published Version: http://www.acquacon.com.br/ponds2009/en/download.p...
Status: Unpublished
URI: http://eprints.whiterose.ac.uk/id/eprint/8627

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