Biodegradability enhancement of landfill leachate nanofiltration concentrate using sequential and combined electrochemical processes

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dc.authorid0000-0002-9134-5535
dc.authorid0000-0003-1983-266X
dc.authorid0000-0001-9940-3878
dc.contributor.authorYucel, Esra
dc.contributor.authorOzen, Irem
dc.contributor.authorCene, Gulay Arslan
dc.contributor.authorIlhan, Hilal
dc.contributor.authorGuvenc, Senem Yazici
dc.contributor.authorCan-Guven, Emine
dc.contributor.authorDemir, Ahmet
dc.date.accessioned2026-02-08T15:15:21Z
dc.date.available2026-02-08T15:15:21Z
dc.date.issued2025
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractIn this study, the treatment of landfill leachate nanofiltration concentrate (LNFC) was investigated using sequential (two distinct stages, one following the other) and combined (two mechanisms operating simultaneously in a single reactor) electrochemical processes. In the first stage, initial pH, applied current, and reaction time were optimized for individual processes: electro-oxidation (EO), peroxi-coagulation (PC), and electrochemical-peroxidation (EP). In the second stage, sequential (EO-PC, PC-EO, EO-EP, EP-EO) and combined (EO/PC, EO/EP) processes were applied with the optimal conditions determined in the first stage. Under optimum conditions (pH 5; applied current 1 A; reaction time 60 min), chemical oxygen demand (COD) removal efficiencies of 38.9 %, 42.1 %, and 53.1 % were obtained for the EO, PC, and EP processes, respectively. Enhanced COD removal was obtained by sequential processes, yielding removal rates of 65.6 % for EO-PC, 71.1 % for PC-EO, 78.3 % for EO-EP, and 83.6 % for EP-EO. The highest efficiencies were observed in the combined systems, with COD removals of 76.4 % for EO/PC and 89.1 % for EO/EP. The lowest specific energy consumption (SEC) was calculated as 31.2 kWh/kg COD for EP among the single processes, 41.0 kWh/kg COD for EP-EO among the sequential processes, and 47.5 kWh/kg COD for EO/EP among the combined processes. These findings suggest that EP-based systems require less energy than EO-based systems. The EO/EP process can be proposed as an alternative treatment for LNFC due to its compliance with the discharge standards (500 mg/L for COD for leachate) specified in the Water Pollution Control Regulation of T & uuml;rkiye and its relatively low SEC.
dc.description.sponsorshipTUBITAK with 2209-A-Research Projects Support Program for Undergraduate Students; Yildiz Technical University-Scientific Research Projects Coordinatorship [FLO-2025-7108]
dc.description.sponsorshipThis research was supported and financed by TUBITAK with 2209-A-Research Projects Support Program for Undergraduate Students and Yildiz Technical University-Scientific Research Projects Coordinatorship with the research project number of FLO-2025-7108.
dc.identifier.doi10.1016/j.jwpe.2025.109221
dc.identifier.issn2214-7144
dc.identifier.scopus2-s2.0-105024189170
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jwpe.2025.109221
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5740
dc.identifier.volume80
dc.identifier.wosWOS:001633146700001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofJournal of Water Process Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzWOS_KA_20260207
dc.subjectAdvanced oxidation
dc.subjectElectrochemical treatment
dc.subjectLandfill leachate
dc.subjectSpecific energy consumption
dc.subjectWastewater treatment
dc.titleBiodegradability enhancement of landfill leachate nanofiltration concentrate using sequential and combined electrochemical processes
dc.typeArticle

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