2026-06-27T11:09:03Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/74612024-07-04T23:50:31Zcom_20.500.14352_14col_20.500.14352_15
Combining Coagulation and Electrocoagulation with UVA-LED
Photo-Fenton to Improve the Efficiency and Reduce the Cost of
Mature Landfill Leachate Treatment
Tejera Tejo, Javier
Hermosilla Redondo, María Daphne
Gascó, Antonio
Negro Álvarez, Carlos Manuel
Blanco Suárez, María Ángeles
This study focused on the reduction of the treatment cost of mature landfill leachate (LL) by enhancing the coagulation pre-treatment before a UVA-LED photo-Fenton process. A more efficient advanced coagulation pretreatment was designed by combining conventional coagulation (CC) and electro-coagulation (EC). Regardless of the order in which the two coagulations were applied, the combination achieved more than 73% color removal, 80% COD removal, and 27% SUVA removal. However, the coagulation order had a great influence on both final pH and total dissolved iron, which were key parameters for the UVA-LED photo-Fenton post-treatment. CC (pH = 5; 2 g L−1 of FeCl36H2O) followed by EC (pH = 5; 10 mA cm−2) resulted in a pH of 6.4 and 100 mg L−1 of dissolved iron, whereas EC (pH = 4; 10 mA cm−2) followed by CC (pH = 6; 1 g L−1 FeCl36H2O) led to a final pH of 3.4 and 210 mg L−1 dissolved iron. This last combination was therefore considered better for the posterior photo-Fenton treatment. Results at the best cost-efficient [H2O2]:COD ratio of 1.063 showed a high treatment efficiency, namely the removal of 99% of the color, 89% of the COD, and 60% of the SUVA. Conductivity was reduced by 17%, and biodegradability increased to BOD5:COD = 0.40. With this proposed treatment, a final COD of only 453 mg O2 L−1 was obtained at a treatment cost of EUR 3.42 kg COD−1.
2023-06-17T08:34:11Z
2023-06-17T08:34:11Z
2023-06-17T08:34:11Z
2021
journal article
https://hdl.handle.net/20.500.14352/7461
1420-3049
10.3390/molecules26216425
eng
VoR
Project CTM2016-77948-R
Project RETOPROSOST-2 (S2018/EMT-4459)
Tejera, Javier, et al. «Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment». Molecules, vol. 26, n.o 21, octubre de 2021, p. 6425. DOI.org (Crossref), https://doi.org/10.3390/molecules26216425.
https://creativecommons.org/licenses/by/3.0/es/
open access
Atribución 3.0 España
MDPI