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Monitoring Microbial Shifts during Activated Sludge Floc and Aerobic Granule Development

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Annular gap bioreactors or Couette-Taylor bioreactors (CTB) were used to apply varying shear forces to the biomass in this study. The shear forces in these bioreactors were controlled by adjusting the rotational speeds, allowing the shear to be independent of aeration rates. Both the inner-cylinder rotating CTB (i-CTB) and outer-cylinder rotating CTB (o-CTB) showed decreasing mean floc diameter as the shear increased. Denaturing gradient gel electrophoresis (DGGE) revealed that microbial communities from the activated sludge from both i-CTB and o-CTB were changing over time and indicated the potential contribution of protozoa to the development of aerobic granules.

Document Type: Research Article


Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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