Abstract
In this study, the treatment of nanofiltration (NF) concentrate from a landfill leachate treatment plant through the electrooxidation (EO) process was investigated. Experimental studies were conducted in a batch reactor equipped with multi-metal oxide/TiO2 doped Ti anode and Pt doped Ti cathode. Persulfate was added as the oxidant and the performance of Fe0, Fe2+, and Fe3+ species as catalysts for persulfate activation was compared. Kinetic studies were carried out for chemical oxygen demand (COD) removal from leachate NF concentrate. Maximum COD removal efficiency was obtained by the EO process in which persulfate was added as the oxidant and Fe2+ was used as the catalyst for persulfate activation. Optimum values of the process variables (pH 5, current 2 A, Fe2+ dose 12 mM and persulfate dose: 60 mM) were determined. The COD removal was 77.1% under optimum conditions. The overall COD removal mechanism is well fitted with the pseudo-first-order and second-order kinetic models with R2 values of > 0.80 under all applied current values. Specific energy consumption calculated for optimum conditions were 73.4 kWh/m3 and 14.3 kWh/kg COD. The EO process assisted with Fe2+ activated persulfate can be evaluated as an efficient treatment method for leachate NF concentrate treatment.
Article Highlights
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SO 4 − . was produced by electrochemically activation.
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Fe 0 , Fe 2+ , and Fe 3+ species as catalysts were compared.
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Multi-metal oxide/TiO 2 anode and Pt/Ti cathode were used in batch processes.
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77.1% COD removal was achieved with electrooxidation—Fe 2+ activated persulfate.
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Kinetic models with R 2 values of > 0.80 under all applied current values.
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Conceptualization and supervision were performed by GV. Investigation and data collection were performed by SYG and EC-G. Analysis and visualization were performed by AC. Software, formal analysis, validation, and methodology were performed by SYG. The first draft of the manuscript was written by GV and EC-G. The manuscript was reviewed and edited by SYG and GV. Electrodes were supplied by BO. All the authors read and approved the final manuscript.
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Yazici Guvenc, S., Can-Güven, E., Cebi, A. et al. Electro/Fe2+/Persulfate Oxidation of Landfill Leachate Nanofiltration Concentrate Using MMO/TiO2-Ti Anode: A Kinetic Study. Int J Environ Res 15, 959–969 (2021). https://doi.org/10.1007/s41742-021-00365-7
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DOI: https://doi.org/10.1007/s41742-021-00365-7