Authors: Yuan, Qiuyan; Oleszkiewicz, Jan A

Source: Water Environment Research, Volume 83, Number 11, November 2011 , pp. 2107-2114(8)

Publisher: Water Environment Federation

Abstract:

A laboratory-scale continuous-flow system with an anaerobic/anoxic/aerobic configuration was set up to study the effect of oxygen in the internal recycle stream; of particular interest was its performance of denitrifying phosphorus-accumulating organisms (DPAOs). It was found that, by using a degas device, the dissolved oxygen in the nitrate recycle stream was effectively decreased from 0.1±0.02 to 0.01±0.01 mg/L. This provided a favorable condition for DPAOs to grow under an anoxic condition and thus be sustained successfully in the system. When the degas device was removed from the system, the dissolved oxygen concentration in the anoxic reactor increased to 0.1±0.02 mg/L. The proliferation of the denitrifying glycogen-accumulating organisms (DGAOs) population and deterioration of DPAOs performance was observed. The increased population of DGAO/GAOs, which competed for the carbon source with DPAO/PAOs, resulted in a poor performance of biological phosphorus removal.

Keywords: biological phosphorus removal; dissolved oxygen; denitrifying phosphorus removal; denitrifying phosphorus-accumulating organisms; glycogen-accumulating organisms

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143011X12928814444538

Affiliations: 1: Department of Civil Engineering, University of Manitoba, Canada

Publication date: 2011-11-01

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