Dépôt numérique
RECHERCHER

Synthetic hospital wastewater treatment by coupling submerged membrane bioreactor and electrochemical advanced oxidation process: Kinetic study and toxicity assessment.

Ouarda, Yassine; Tiwari, Bhagyashree; Azaïs, Antonin; Vaudreuil, Marc-Antoine; Ndiaye, Sokhna Dieng; Drogui, Patrick; Tyagi, Rajeshwar Dayal; Sauvé, Sébastien; Desrosiers, Mélanie; Buelna, Gerardo; Dubé, Rino (2018). Synthetic hospital wastewater treatment by coupling submerged membrane bioreactor and electrochemical advanced oxidation process: Kinetic study and toxicity assessment. Chemosphere , vol. 193 . p. 160-169. DOI: 10.1016/j.chemosphere.2017.11.010.

Ce document n'est pas hébergé sur EspaceINRS.

Résumé

In this work, the combination of membrane bioreactor (MBR) and electro-oxidation (EO) process was studied for the treatment of a synthetic hospital wastewater fortified with four pharmaceutical pollutants namely carbamazepine (CBZ), ibuprofen (IBU), estradiol (E-E) at a concentration of 10 μg L ⁻¹ venlafaxine (VEN) at 0.2 μg L⁻¹. Two treatment configurations were studied: EO process as pre-treatment and post-treatment. Wastewater treatment with MBR alone shows high removal percentages of IBU and E-E (∼90%). Unlikely for CBZ and VEN, a low elimination percentage (∼10%) was observed. The hydraulic and the solid retention times (HRT and SRT) were 18 h and 140 d respectively, while the biomass concentration in the MBR was 16.5 g L⁻¹. To enhance pharmaceuticals elimination, an EO pretreatment was conducted during 40 min at 2 A. This configuration allowed a 92% removal for VEN, which was far greater than both treatments alone, with lower than 30% and 50% for MBR and EO, respectively. The MBR-EO coupling (EO as post-treatment) allows high removal percentages (∼97%) of the four pharmaceutical pollutants after 40 min of treatment at a current intensity of 0.5 A with Nb/BDD as electrodes. This configuration appears to be very effective compared to the first configuration (EO-MBR) where EO process is used as a pre-treatment. Toxicity assessment showed that the treated effluent of this configuration is not toxic to Daphnia magna except at 100% v/v. The MBR-EO coupling appears to be a promising treatment for contaminated hospital effluents.

Type de document: Article
Mots-clés libres: hospital wastewaters; pharmaceutical pollutants; electrochemical advanced oxidation process; membrane bioreactor; Daphnia toxicity test
Centre: Centre Eau Terre Environnement
Date de dépôt: 12 févr. 2018 20:59
Dernière modification: 23 mars 2018 18:28
URI: http://espace.inrs.ca/id/eprint/6572

Actions (Identification requise)

Modifier la notice Modifier la notice