The behaviour of an activated sludge system in starvation conditions was examined in batch according to substrate impulses defined by different S0/X0 ratio. The answer was characterised by an exogenous phase followed by a starvation one. If at high S0/X0 ratio, bacterial cell multiplication was the main synthesis process during exogenous phase, at low S0/X0 ratio the observed phenomenon was compound storage. In starvation conditions, for the lowest S0/X0 ratio, a rapid decrease in the MLVSS without soluble proteins production was observed. No bacterial lysis occurred and this phenomenon was due to consumption of the storage compounds with a decrease rate equal to 0.74 d−1. For high S0/X0 ratio, as soon as the exogenous phase was completed, a decrease of the MLVSS simultaneously to a soluble protein production was observed. An immediate bacterial lysis occurred with a decay rate equal to 0.53 d−1. Because MBR systems work generally in low F/M conditions, the activity of the present microbial population is close to the one observed in starvation phase. This work points out that these conditions do not allow net bacterial growth and cells just use lysis products to satisfy their maintenance requirements. These assumptions confirm the feasibility of a decrease of the net biomass production in a MBR when high sludge retention time is operated.
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Research Article|
March 01 2005
Effects of starvation conditions on biomass behaviour for minimization of sludge production in membrane bioreactors
J. Lobos;
1Laboratoire de Génie des Procédés d'Elaboration des Bioproduits, UMR CIRAD 016, Université de Montpellier II, Place Eugéne Bataillon, 34095 Montpellier cedex 05, France (E-mail: wisniews@univ-montp2.fr; heran@univ-montp2.fr; grasmick@univ-montp2.fr)
E-mail: lobos@univ-montp2.fr
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C. Wisniewski;
C. Wisniewski
1Laboratoire de Génie des Procédés d'Elaboration des Bioproduits, UMR CIRAD 016, Université de Montpellier II, Place Eugéne Bataillon, 34095 Montpellier cedex 05, France (E-mail: wisniews@univ-montp2.fr; heran@univ-montp2.fr; grasmick@univ-montp2.fr)
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M. Heran;
M. Heran
1Laboratoire de Génie des Procédés d'Elaboration des Bioproduits, UMR CIRAD 016, Université de Montpellier II, Place Eugéne Bataillon, 34095 Montpellier cedex 05, France (E-mail: wisniews@univ-montp2.fr; heran@univ-montp2.fr; grasmick@univ-montp2.fr)
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A. Grasmick
A. Grasmick
1Laboratoire de Génie des Procédés d'Elaboration des Bioproduits, UMR CIRAD 016, Université de Montpellier II, Place Eugéne Bataillon, 34095 Montpellier cedex 05, France (E-mail: wisniews@univ-montp2.fr; heran@univ-montp2.fr; grasmick@univ-montp2.fr)
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Water Sci Technol (2005) 51 (6-7): 35–44.
Citation
J. Lobos, C. Wisniewski, M. Heran, A. Grasmick; Effects of starvation conditions on biomass behaviour for minimization of sludge production in membrane bioreactors. Water Sci Technol 1 March 2005; 51 (6-7): 35–44. doi: https://doi.org/10.2166/wst.2005.0619
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