Journal
WATER RESEARCH
Volume 131, Issue -, Pages 310-319Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.12.070
Keywords
Anodic oxidation; Electro-oxidation; Reactive electrochemical membrane; Organic pollutants; Sub-stoichiometric titanium oxide; Mineralization
Funding
- National French Agency of Research 'ANR' [ANR-13-ECOT-003]
Ask authors/readers for more resources
Reactive Electrochemical Membrane (REM) prepared from carbothermal reduction of TiO2 is used for the mineralization of biorefractory pollutants during filtration operation. The mixture of Ti4O7 and Ti5O9 Magneli phases ensures the high reactivity of the membrane for organic compound oxidation through (OH)-O-center dot mediated oxidation and direct electron transfer. In cross-flow filtration mode, convection-enhanced mass transport of pollutants can be achieved from the high membrane permeability (3300 LMH bar(-1)). Mineralization efficiency of oxalic acid, paracetamol and phenol was assessed as regards to current density, transmembrane pressure and feed concentration. Unprecedented high removal rates of total organic carbon and mineralization current efficiency were achieved after a single passage through the REM, e.g. 47 g m(-2) h(-1) - 72% and 6.7 g m(-2) h(-1) - 47% for oxalic acid and paracetamol, respectively, at 15 mA cm(-2). However, two mechanisms have to be considered for optimization of the process. When the TOC flux is too high with respect to the current density, aromatic compounds polymerize in the REM layer where only direct electron transfer occurs. This phenomenon decreases the oxidation efficiency and/or increases REM fouling. Besides, O-2 bubbles sweeping at high permeate flux promotes O-2 gas generation, with adverse effect on oxidation efficiency. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available