Anodic oxidation of effluents from stages of MBR-UF Municipal landfill leachate treatment plant
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Date
2020-05-18
Journal Title
Journal ISSN
Volume Title
Publisher
Mary Ann Liebert
Abstract
This study used boron-doped diamond electrode on niobium substrate (Nb/boron-doped diamond [BDD]) for the anodic oxidation of landfill leachate in a batch reactor. Raw leachate and biologically pretreated effluent samples were collected from each step of the existing unit operation of a municipal landfill leachate treatment plant (Kocaeli-Turkey). The influence of parameters, such as treatment time, initial pH (3.50–10.0), and applied current density (j = 76–1,060 A/m2), on the removal of total organic carbon (TOC), chemical oxygen demand (COD), and ammonium nitrogen (NH4+-N) was assessed. The highest pollutant removal efficiencies were obtained at leachate inherent pH (6.50–8.75), moreover, pollutant removal rates increased with the increase in current density. The NH4+-N removal mainly occurred by indirect oxidation and well fitted second-order kinetics, whereas COD removal followed pseudo first-order kinetics. The optimum current density ensuring simultaneous removal of COD and NH4+-N was 756 and 455 A/m2 for raw leachate and for pretreated effluents, respectively. Under these optimums, nearly complete NH4+-N removal was attained, while ≥97% removal of TOC and COD was recorded. Herein, we present anodic oxidation as a suitable alternative for treatment of both stabilized raw leachate and effluents from stages of the membrane bioreactor/ultrafiltration treatment plant for the abatement of COD, TOC, and NH4+-N.
Description
Keywords
Anodic oxidation, COD removal, Landfill leachate, MBR effluents, NH4+-N removal
Citation
Ukundimana, Z., Kobya, M., Omwene, P. I., Gengec, E., Can, O. T. (2020). Anodic oxidation of effluents from stages of MBR-UF Municipal landfill leachate treatment plant. Environmental Engineering Science. http://doi.org/10.1089/ees.2020.0003