Influence of the starting microbial nucleus type on the anaerobic granulation dynamics |
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Authors: | R El-Mamouni R Leduc S R Guiot |
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Institution: | (1) Environmental Bioengineering Group, Biotechnology Research Institute, N.R.C., 6100 Royalmount Avenue, Montréal, Québec, H4P 2R2, Canada. Fax 1 514 496 6265 e-mail: serge.guiot@nrc.ca, CA;(2) Department of Civil Engineering, University of Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada, CA |
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Abstract: | The influence of four different granulation precursors, syntroph-enriched methanogenic consortia, Methanosaeta-enriched, Methanosarcina-enriched nuclei and acidogenic flocs, on the time course of complex granule development and the lag time for start-up was
investigated in four upflow anaerobic sludge-bed and filter reactors. Although the operational conditions allowed the maintenance
of the same specific growth rate of biomass in the four reactors, granulation proceeded rapidly with syntroph/methanogenic
consortia, Methanosaeta and Methanosarcina nuclei. However, granulation was significantly retarded when acidogenic flocs were used as precursors. The granule mean Sauter
diameter increased rapidly in the reactor inoculated with syntroph/methanogenic consortia, Methanosaeta and Methanosarcina nuclei and reached, at the end of the experiment, 3.1, 2.7 and 2.4 mm compared to 1.1 mm in that inoculated with acidogenic
flocs. This corresponded to a rate of granule size increase of 31, 21, 18 μm/day in syntroph/methanogenic consortia, Methanosaeta and Methanosarcina nuclei, respectively, compared to 7 μm/day in acidogenic flocs. Biomass specific activities (i.e. acidogenic, syntrophic
and methanogenic activities) increased stepwise in all reactors with time, especially in those inoculated with syntroph/methanogenic
consortia and Methanosaeta nuclei. From these results it appears that syntrophs and Methanosaeta spp. play an important role in the anaerobic granulation process.
Received: 25 January 1996 / Received revision: 3 September 1996 / Accepted: 13 September 1996 |
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