Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 319, Issue -, Pages 13-23Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.12.010
Keywords
Bioelectro-Fenton; Electro-Fenton; Biodegradability; Oxidation by-products; Hydroxyl radicals
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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-blocket 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 by (OH)-O-center dot (k(MTPL)) was determined by the competition kinetics method and found to be (1.72 +/- 0.04) x 10(9) M-1 s(-1). A reaction pathway for the mineralization of the drug was proposed based on the identification of oxidation byproducts. Secondly, EF process was used as pre-treatment. An increase of BOD5/COD ratio from 0.012 to 0.44 was obtained after 1 h 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. (C) 2015 Elsevier B.V. All rights reserved.
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