Improving phosphorus removal in aerobic granular sludge processes through selective microbial management
(2016) Bioresource Technology — Vol. 211, p. 298-306 (2016)
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- Abstract
- This study aimed to improve phosphorus removal in aerobic granular sludge sequential batch reactors (AGS-SBR) by a differential selection of the granules containing the highest proportion of phosphate accumulating organisms (PAOs). The abundance of PAOs in granules with different density was analyzed by PCR-DGGE, pyrosequencing and qPCR. Dense granules contained a higher proportion of Candidatus Accumulibacter (PAO) with a 16S rRNA gene frequency up to 45%. Starting with an AGS-SBR with low height/diameter ratio performing unstable P removal, two strategies of biomass removal were assessed. First, a high selective pressure (short settling time) was applied and second, an increase of the settling time was combined with a homogeneous purge of the sludge bed. The first strategy resulted in a reduction of P removal efficiency while the second improved and stabilized P removal over 90%. This study offers a new approach of biomass management in AGS-SBR.
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Citations
Henriet, O., Meunier, C., Henry, P., & Mahillon, J. (2016). Improving phosphorus removal in aerobic granular sludge processes through selective microbial management. Bioresource Technology, 211, 298-306. https://doi.org/10.1016/j.biortech.2016.03.099 (Original work published 2016)