Effect Of The Start-up Length On The
Biological Nutrient Removal Process
Author(s)
F. J. Fernández, J. Villaseñor & L. Rodríguez
Abstract
In this work, a study of the start-up stage of a Biological Phosphorus Removal
(BPR) process was carried out.
To do this, SBR alternating anaerobic and aerobic conditions were used with
conventional activated sludge and fed with synthetic influent at the beginning of
each cycle. During the length of the cycles (4 h) the most important parameters
were determined.
The main results obtained were that during the first days of the start-up stage
the phosphorus removal percentage increased more quickly that those of the
COD and ammonium-nitrogen. However, it was necessary to extend the start-up
stage to at least 30 days in order to obtain the maximum phosphorus removal
percentages and a stable Phosphorus Accumulating Organisms (PAO)
population, whereas the maximum COD and ammonium-nitrogen removal
percentages were obtained in about ten days.
Once the start-up period had finished the ratio P released to COD stored was
determined, obtaining a value of about 0.14, which is significantly lower than the
theoretical value (0.55), suggesting the presence of a significant GAO
population.
Keywords: activated sludge, biological phosphorus removal, biological nitrogen
removal, start-up stage.
1 Introduction
Biological Nutrient Removal (BNR) processes are being widely used to remove
nutrients, Nitrogen and Phosphorous, as well as organic compounds contained in
Keywords
activated sludge, biological phosphorus removal, biological nitrogen
removal, start-up stage.
Related Book
Other papers in this volume
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