Camargo Valero, M, Read L F, , Mara, D, Newton, R, Curtis, T and Davenport, R (2009) Nitrification-denitrification in WSP: a mechanism for permanent nitrogen removal in maturation ponds. In: UNSPECIFIED 8th IWA Specialist Group on Waste Stabilization Ponds, 26-29 Apr 2009, Belo Horizonte/MG Brazil. . (Unpublished)
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.
|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) > Earth Surface Science Institute (ESSI) (Leeds)|
|Depositing User:||Ms Caroline Wilson|
|Date Deposited:||22 May 2009 15:42|
|Last Modified:||26 Aug 2015 13:34|