(60d) Removal of Pesticide from Wastewater By Electrochemical Advanced Oxidation Processes
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2020
- Proceeding: 2020 Virtual Spring Meeting and 16th GCPS
- Group: Spring Meeting Poster Session and Networking Reception
- Time: Wednesday, August 19, 2020 - 3:00pm-4:00pm
The present work reports the electrochemical degradation of the pesticide advanced oxidation processes like anodic oxidation with electro-generated H2O2, electro-Fenton (EF) and UVA photo-electro-Fenton (PEF). A boron-doped diamond (BDD) anode was combined with an air-diffusion cathode to produce H2O2 and oxidize the pesticide. Degradation of pesticide was related to its, applied current density, and the concentration of fenton reagent. Complete pesticide removal and approximately 88% of organic matter oxidation was achieved by all methods at a constant current density (j) â¥120.0 mA cmâ2. Pesticide degradation kinetics as well as chemical oxygen demand removal rate were successfully modeled to pseudo first-order kinetic. Organic matter mineralization was found to be independent from pH within the range 3.0â9.0. Electro-Fenton and photo-electro-Fenton processes showed an optimum pH and ferric ion concentration of 3.0, 0.50 mM, respectively, and showed the highest pesticide removal under two consecutive pseudo-first-order kinetic stages. The obtained degradation efficiency was related to the fast reaction between the targeted pesticide and the generated hydroxyl radicals. In conclusion, PEF was observed to give the best treatment as a results of the decomposition of photoactive intermediates by UVA radiation. The pesticide degradation pathway was proposed based on the products identified by GCâMS and LC-MS/MS. Oxalic and oxamic acids were detected as final carboxylic acids by ion-exclusion HPLC.