Dominance of the genus Polaromonas in the microbial ecology of an Intermittently Aerated Sequencing Batch Reactor (IASBR) treating dairy processing wastewater under varying aeration rates
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Media type:
E-Article
Title:
Dominance of the genus Polaromonas in the microbial ecology of an Intermittently Aerated Sequencing Batch Reactor (IASBR) treating dairy processing wastewater under varying aeration rates
Description:
<jats:p>In this Research Communication we investigate potential correlations between key bacterial groups and nutrient removal efficiency in an Intermittently Aerated Sequencing Batch Reactor (IASBR) treating synthetic dairy processing wastewater. Reactor aeration rates of 0·6 and 0·4 litre per minute (LPM) were applied to an 8 l laboratory scale system and the relative impacts on IASBR microbial community structure and orthophosphate (PO<jats:sub>4</jats:sub>-P) and ammonium (NH<jats:sub>4</jats:sub>-N) removal efficiencies compared. Aeration at 0·6 LPM over several sludge retention times (SRTs) resulted in approximately 92% removal efficiencies for both PO<jats:sub>4</jats:sub>-P and NH<jats:sub>4</jats:sub>-N. Biomass samples subjected to next-generation sequencing (NGS), 16S rRNA profiling revealed a concomitant enrichment of <jats:italic>Polaromonas</jats:italic> under 0·6 LPM conditions, up to ~50% relative abundance within the reactor biomass. The subsequent shift in reactor aeration to 0·4 LPM, over a period of 3 SRTs, resulted in markedly reduced nutrient removal efficiencies for PO<jats:sub>4</jats:sub>-P (50%) and NH<jats:sub>4</jats:sub>-N (45%). An 85·7% reduction in the genus level relative abundance of <jats:italic>Polaromonas</jats:italic> was observed under 0·4 LPM aeration conditions over the same period.</jats:p>