Contributions of biofilm and suspended sludge to nitrogen transformation andnitrous oxide emission in hybrid sequencing batch system
Ingwei Wayne Lo , Kwang Victor Lo , Don S Mavinic , Dean Shiskowski , William Ramey
DOI:
Received September 24, 2009,Revised November 16, 2009, Accepted , Available online
Volume 22,2010,Pages 953-960
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Hybrid system combines the nature of suspended growth and attached growth has been widely applied to wastewater treatment.
In this research, the contributions to N transformation and N2O emission by biofilm and suspended sludge in the hybrid sequencingbatch
reactor for a simultaneous nitrification, denitrification and phosphorus removal process were investigated. For the hybrid system,
nitrification occurred mostly in the suspended sludge, while the biofilm played the major role in denitrification. The interaction of
the biofilm and the suspended sludge in the same reactor resulted in a better overall nitrogen removal performance with simultaneous
nitrification and denitrification. However, N2O emission was the main end product of nitrogen removal for the hybrid system; while
it was N2 for the biofilm. The relative low N2O emissions from the pure biofilm and the pure suspended sludge corresponded to the
relatively high nitrate at the end of the aeration period compared with the hybrid system.
