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EVIDENCE OF NON – CAND. A. PHOSPHATIS POPULATION PARTICIPATING IN ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL IN CARROUSEL ACTIVATED SLUDGE PROCESS

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This study investigated the potential of Enhanced Biological Phosphorus Removal (EBPR) in a full-scale Carrousel activated sludge process, not designed to achieve biological phosphorus removal. The Carrousel activated sludge process configuration does not have any strict anaerobic environment, and thus does not follow the conventional EBPR design. Experiments were carried out at full-scale and bench-scale. Full-scale sampling and analysis of the Carrousel process clearly indicated the existence of an EBPR activity in the mixed liquor where almost 70 % dissolved P was observed to be removed. Phosphorus release and uptake kinetics on the Carrousel full-scale mixed liquor exhibited a good phosphorus release and uptake trend with 2.66 mg PO4-P/mg VSS-day specific P release and 0.099 mg PO4-P/mg VSS-day specific uptake rates respectively, for the month of October. The Carrousel in-situ conditions were simulated in a bench-scale sequencing batch reactor by bubbling nitrogen gas containing 0.3% dissolved oxygen, hence the conditions were not truly anaerobic. Effective and sustainable EBPR activity could be maintained in the bench-scale reactor for over 200 days of operation. In order to evaluate the microbial community, bacterial communities that were targeted by the RHC439f polymerase chain reaction forward primer, a most commonly used primer to target CAND. A. PHOSPHATIS related organisms, were identified and analyzed. Molecular analysis using 16S rRNA gene cloning and sequencing, showed dominance of Dechloromonas sp. and Propionivibrio, instead of CAND. A. PHOSPHATIS in both the full and bench-scale samples.
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Document Type: Research Article

Publication date: 01 January 2007

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