title: Bioelectro-Fenton: A sustainable integrated process for removal of organic pollutants from water: Application to mineralization of metoprolol.
abstract: The relevant environmental hazard related to the presence of pharmaceuticals in water sources requires the development of high effective and suitable wastewater treatment technologies. In the present work, a hybrid process coupling electro-Fenton (EF) process and aerobic biological treatment (Bio-EF process) was implemented for the efficient and cost-effective mineralization of beta-blocker metoprolol (MPTL) aqueous solutions. Firstly, operating factors influencing EF process were assessed. MTPL solutions were completely mineralized after 4h-electrolysis under optimal operating conditions and BDD anode demonstrated its oxidation superiority. The absolute rate constant of MTPL oxidation byOH (kMTPL) was determined by the competition kinetics method and found to be (1.72±0.04)×10(9)M(-1)s(-1). A reaction pathway for the mineralization of the drug was proposed based on the identification of oxidation by-products. Secondly, EF process was used as pre-treatment. An increase of BOD5/COD ratio from 0.012 to 0.44 was obtained after 1h EF treatment, along with 47% TOC removal and a significant decrease of toxicity, demonstrating the feasibility of a post-biological treatment. Finally, biological treatment successfully oxidized 43% of the total TOC content. An overall 90% mineralization of MPTL solutions was achieved by the Bio-EF process, demonstrating its potentiality for treating wastewater containing pharmaceutical residues.
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPE, 77454, Marne-la-Vallée, France.
authors.forename: Hugo
authors.initials: H
authors.lastname: Olvera-Vargas
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPE, 77454, Marne-la-Vallée, France.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Cocerva
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPE, 77454, Marne-la-Vallée, France.
authors.forename: Nihal
authors.initials: N
authors.lastname: Oturan
authors.affiliation: Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, Cedex 05, France.
authors.forename: Didier
authors.initials: D
authors.lastname: Buisson
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPE, 77454, Marne-la-Vallée, France. Electronic address: mehmet.oturan@univ-paris-est.fr.
authors.forename: Mehmet A
authors.initials: MA
authors.lastname: Oturan
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000737:chemistry / Q000378:metabolism / Q000633:toxicity; D000332:Aerobiosis; D048908:Aliivibrio fischeri / Q000187:drug effects / Q000378:metabolism; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D004572:Electrolysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008790:Metoprolol / Q000737:chemistry* / Q000378:metabolism* / Q000633:toxicity; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism* / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
chemical_list: D000319:Adrenergic beta-Antagonists; D016877:Oxidants; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron; D008790:Metoprolol
keywords: Biodegradability; Bioelectro-Fenton; Electro-Fenton; Hydroxyl radicals; Oxidation by-products