Influence of the initial composition of algal-bacterial microcosms on the degradation of salicylate in a fed-batch culture |
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| Authors: | Benoit Guieysse Xavier Borde Raul Muñoz Rajni Hatti-Kaul Caroline Nugier-Chauvin Henri Patin Bo Mattiasson |
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| Institution: | (1) Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden;(2) Laboratoire de Chimie des Biomolécules et des Systèmes Organisés, CNRS UMR 6052, Ecole Nationale Supérieure de Chimie de Rennes, Avenue du Général Leclerc, F-35700 Rennes, France |
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| Abstract: | The influence of the initial composition of an algal-bacterial microcosm constituted of Chlorella sorokiniana and Ralstonia basilensis was tested for the fed-batch degradation of salicylate at 5 mM. Salicylate degradation was always limited by the O2 generation rate, which was initially proportional to the algal density, but rapidly became limited by the availability of light once the algae started to grow. The decrease of the salicylate removal rate observed at high algal densities was likely caused by mutual shading within the algal population and the increase of O2 consumption due to algal dark respiration. With repeated salicylate amendments, all systems converged towards the same characteristics, reaching an optimum rate of salicylate degradation at 1 mmol l–1 day. |
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| Keywords: | algal-bacterial microcosms aromatic pollutants biodegradation Chlorella sorokiniana inoculation Ralstonia basilensis |
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