Importance of organic- and inorganic-based electro-precipitation on the advanced electro-oxidation efficiency towards reclaimed wastewater treatment in thin-film reactor - Mechanistic and modeling studies
Document Type
Article
Publication Date
12-1-2024
Abstract
To face the global water crisis with the increase of both water demand and water stress, it is necessary to consider wastewater effluent as a non-conventional water resource. However, before reusing this water, it is compulsory to apply complementary treatment to it so that the water discharge will be in full agreement with the regulations befitting the water reuse purpose. Electrochemical systems have been demonstrated to offer good performance in removing recalcitrant pollutants, but the influence of the matrix of reclaimed wastewater, and particularly the phenomenon of cathodic electro-precipitation has barely been considered until now. Therefore, a detailed mechanistic and modeling study of the influence of cathodic organic- and inorganic-based electro-precipitation on the advanced electro-oxidation efficiency for reclaimed wastewater treatment is newly proposed. For the first time, the predictive model takes into account multi-phenomena such as local cathodic alkalization, cathodic electro-precipitation of CaCO3, Ca-3(PO4)(2), as well as organic co-precipitation, anodic oxidation of carbonates, and electro-oxidation of organic contents. The results demonstrated that electro-precipitation increased with the use of real reclaimed wastewater compared to the simulated wastewater due to the co-precipitation of organics. Higher current density (16 mA cm(-2)) led to the anodic oxidation of carbonates, which reduced their ability to be precipitated on the cathode. Tylosin, a representative micropollutant, could be fully degraded using the stipulated thin-film electrochemical reactor. However, chlorinated and nitrogenous by-products accumulated at such a range of currents, and hypochlorous acid occupied a central role in the overall oxidation pathways that have been proposed.
Keywords
Cathodic electro-precipitation, Anodic oxidation, Chlorinated and nitrogenous by-products pathway, Predictive modeling, Reclaimed wastewater, Pharmaceuticals recalcitrant pollutant
Divisions
sch_che
Funders
French Ministry of Higher Education, Research, and Innovation (MESRI),Carnot ICEEL,LTSER Zone Atelier du Bassin de la Moselle (ZAM),European regional development fund program (CPER SusChemProc)
Publication Title
Journal of Environmental Chemical Engineering
Volume
12
Issue
6
Publisher
Elsevier
Publisher Location
125 London Wall, London, ENGLAND