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Nitrogen removal in maturation WSP ponds via biological uptake and sedimentation of dead biomass

Camargo Valero, M.A., Mara, D.D. and Newton, R.J. (2009) Nitrogen removal in maturation WSP ponds via biological uptake and sedimentation of dead biomass. In: 8th IWA Specialist Group Conference on Waste Stabilization Ponds, 26 - 29 April, 2009, Belo Horizonte/MG Brazil. (Unpublished)

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Abstract

In this work a set of experiments was undertaken in a pilot-scale WSP system to determine the importance of organic nitrogen sedimentation on ammonium and total nitrogen removals in maturation ponds and its seasonal variation under British weather conditions. Two maturation ponds in series (M1 and M2) were monitored seasonally from September 2004 to May 2007. The nitrogen content in collected sediment samples varied from 4.17 to 6.78 percent (dry weight) and calculated nitrogen sedimentation rates ranged from 291 to 2,868 g N/ha d in M1 and from 273 to 2,077 g N/ha d in M2. The increment of chlorophyll-a in M1 and M2 maturation pond effluents had a very good correlation with the corresponding increment of VSS (algal biomass) and suspended organic nitrogen; therefore, the occurrence of biological (algal) nitrogen uptake was confirmed. After sedimentation of the dead algal biomass, it was clear that algal-cell nitrogen was recycled from the sludge layer into the pond water column. An important portion (51% in M1 and 39% in M2) of the nitrogen taken up by the in-pond algae was finally accumulated as sludge after anaerobic digestion. Biological (mainly algal) uptake of inorganic nitrogen species and further sedimentation of dead biomass is one of the major mechanisms controlling ammonium and nitrogen removal in maturation WSP, particularly when environmental and operational conditions are favourable for algal growth.

Item Type: Conference or Workshop Item (Paper)
Keywords: Algal nitrogen uptake; maturation pond; sedimentation; nitrogen removal
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 15:34
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/8625

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