2026-06-10T05:55:16Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/747482025-09-11T11:17:59Zcom_10324_1157com_10324_931com_10324_894col_10324_1298

Treatment of mature landfill leachate by electrocoagulation followed by Fenton or UVA-LED photo-Fenton processes Tejera, Javier Hermosilla, Daphne Gascó, Antonio Miranda, Rubén Negro, Carlos Blanco, Ángeles Alonso Gómez, Víctor The main objective of this study is to optimize a two-step treatment for mature landfill leachate consisting of electrocoagulation (EC) followed by Fenton or UVA-LED photo-Fenton processes aiming to provide a more efficient and feasible alternative treatment strategy that also increases biodegradability and decreases conductivity. Although 5 mA cm−2 EC is cheaper than 10 mA cm−2 EC per kg of removed COD (0.63 vs. 0.89 € kgCOD−1), it achieved the half total COD removal (13% compared to 26%), and the low residual iron concentration (100 mg L−1) that remained at the end of the process made necessary a long treatment time to perform the posterior Fenton (48 h) or UVA-LED photo-Fenton (6 h) process. When EC was performed at 10 mA cm−2, the residual iron concentration (220 mg L−1) was high enough to reduce treatment time by one half for both Fenton processes. Consequently, treatment cost decreases from 5.91 to 3.48 € kgCOD−1 for the EC + UVA-LED photo-Fenton ([H2O2]/COD = 1.063) treatment combination; whereas it slightly decreases from 1.68 to 1.61 € kgCOD−1 for the alternative EC + conventional Fenton combination. In both cases, total COD removal was around 87%. In addition, SUVA removal was >40%, conductivity was reduced about 20–30%, and biodegradability (BOD5/COD) increased over 0.3. 2025-01-31T18:58:36Z 2025-01-31T18:58:36Z 2021 info:eu-repo/semantics/article Journal of the Taiwan Institute of Chemical Engineers, 2021, Volume 119, Pages 33-44, 1876-1070 https://uvadoc.uva.es/handle/10324/74748 10.1016/j.jtice.2021.02.018 33 44 Journal of the Taiwan Institute of Chemical Engineers 119 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional SI