This work was financed by the ADEME

This work was financed by the ADEME (French Environment
and Energy Management Agency) and the INRA (French National
Institute for Agricultural Research). The experiments were funded
by Veolia Environment, Research and Development. We would like
to thank Christophe Labat and Guillaume Bodineau for their help in
the experiment setup, Valérie Bergheaud and Valérie Dumeny for
their assistance in sampling and Véronique Etievant for her collaboration
in the laboratory analyses. We would like to thank Suzette
Tanis-Plant for her discussion and English editorial advice.