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    Anodic Oxidation of Effluents from Stages of MBR-UF Municipal Landfill Leachate Treatment Plant
    (Mary Ann Liebert, Inc, 2020) Ukundimana, Zubeda; Kobya, Mehmet; Omwene, Philip Isaac; Gengec, Erhan; Can, Orhan Taner
    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/m(2)), 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/m(2)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.
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    Phosphorus removal from domestic wastewater in electrocoagulation reactor using aluminium and iron plate hybrid anodes
    (Elsevier Science Bv, 2018) Omwene, Philip Isaac; Kobya, Mehmet; Can, Orhan Taner
    The aim of this study was to investigate the effects of initial pH (pH(i) = 4.0-7.0), current density (j = 10-40 A/m(2)), initial phosphorus (P) concentration (C-i of 5.01-52.13 mg/L) and electrocoagulation (EC) time (t(Ec) = 10-100 min) on phosphorus removal from domestic wastewater by a batch EC reactor using hybrid aluminium (Al)-iron (Fe) anodes and titanium cathode. Phosphorus removal from domestic wastewater containing 52.13 mg/L PO4-P was obtained to be 99.99% at optimum conditions (pH(i) = 4, j = 20 A/m(2) and EC time = 80 min). The energy and electrode consumptions at optimum conditions were calculated as 3.422 kWh/m(3) and 0.328 kg/m(3), respectively. The amount of removed P per electrochemically dissolved total metal electrode (q(e)) was calculated as 55.69 mg P/g, while the dissolved metal to removed phosphorus ratio (M-e/P, mol/mol) was 4.40 (Fe/P = 2.63 and Al/P = 1.77) at optimum conditions. It can be concluded that phosphorus removal by hybrid Al-Fe anodes is as effective as using only Fe or Al anodes as per the results present in literature. In addition, the effluent pH after EC treatment process at optimum conditions was 8.8, hence requiring no pH adjustment before discharge.