| en |
Activated sludge acclimation for toluene and DEHP degradation in a two-phase partitioning bioreactor
Béchohra, I.; Le Menn, J.B.; Couvert, A. & Amrane, A.
Abstract
The effect of activated sludge acclimation on the
biodegradation of toluene in the presence of a biodegradable non-aqueous phase liquid, di (2-ethylhexyl) phthalate
(DEHP), in a two-phase partitioning bioreactor was characterized. The influence of the presence of DEHP, at a ratio
of 0.1 % (volume ratio), and of the acclimation of activated
sludge (AS) on the biodegradation of hydrophobic VOC
was studied. AS was acclimated to both toluene and DEHP
simultaneously. Using acclimated cells, 73 and 96 %
improvement of the mean biodegradation rates was recorded for toluene and the organic solvent (DEHP), respectively, if compared to the values recorded in the absence of
acclimation, during tests performed in Erlenmeyer flasks.
Degradation rates were further improved by the use of
acclimated AS in a reactor with a large head space;
degradation yields for toluene and DEHP were above 99
and 89 %, respectively.
Keywords
Toluene; DEHP; Activated sludge; Biodegradation; Acclimation
|
