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مجله زیست شناسی اروپای مرکزی 2014
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  • from macro to lab-scale: changes in bacterial community led to deterioration of ebpr in lab reactor

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 759
    • تعداد پرسش و پاسخ ها: 0
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     a laboratory scale sequencing batch reactor (sbr), fed with synthetic wastewater containing a mixture of organic compounds, was operated for nearly six months. despite maintaining the same operational conditions, a deterioration of enhanced biological phosphorus removal (ebpr) occurred after 40 days of sbr operation. the prel/cupt ratio decreased from 0.28 to 0.06 p-mol c-mol−1, and c requirements increased from 11 to 32 mg c h−1 g−1 of mixed liquor suspended solids. a fish analysis showed that the percentage of accumulibacter in an overall community of polyphosphate accumulating organisms (paos) and glycogen accumulating organisms (gaos) dropped from 93% to 13%. an increase in abundance of gammaproteobacteria (from 2.6% to 22%) andalphaproteobacteria (from 1.8% to 10%) was observed. the number of competibacter increased from 0.5% to nearly 9%. clusters 1 and 2 of defluviicoccus-related gaos, not detected before deterioration, constituted 35% and 27% of alphaproteobacteria, respectively. we concluded that lab-scale experiments should not be extended implicitly to full-scale ebpr systems because some bacterial groups are detected mainlyin lab-scale reactors. well-defined, lab-scale operational conditions reduce the number of ecological niches available to bacteria.

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