Implementation of an advanced photooxidation process to intensify pharmaceuticals removal by a membrane bioreactor
Résumé
Removal of pharmaceuticals from wastewaters is of particular importance nowadays. If biodegradable molecules can be nearly totally eliminated by biological treatments such as membrane bioreactor (MBR), many pharmaceutics are recalcitrant. To improve the removal of these micropollutants, an advanced oxidation process (AOP), based on TiO2 photocatalyst, has been implemented on a recirculation loop on a 15-L MBR operated with a sludge retention time (SRT) of 30d and a hydraulic retention time (HRT) of 48h. This innovative process did not negatively impact the bacterial community of the MBR which maintained same a Total Suspended Solids (TSS) concentration of 5g.L-1 and a high carbon removal yield (> 92 %). For different flux densities tested (4, 17 and 40 W.m-²), similar degradation efficiency was observed for two pharmaceuticals: ibuprofen (IBU) and carbamazepine (CBZ). Thus, a flux density of 4 W.m-² was selected for the coupling. This configuration intensified the degradation of CBZ by a factor 10 (up to 28 % removal) in comparison with the MBR alone and the removal of IBU was maintained close to 99 %.
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