RT info:eu-repo/semantics/article
T1 Combining coagulation and electrocoagulation with UVA-LED photo-fenton to improve the efficiency and reduce the cost of mature landfill leachate treatment
A1 Tejera Tejo, Javier
A1 Hermosilla Redondo, María Daphne
A1 Gasco Guerrero, Antonio María
A1 Negro Alvarez, Carlos Manuel
A1 Blanco Suárez, Ángeles
K1 Ingeniería Agrícola
K1 Forestal
K1 Wastewater treatment
K1 Electrocoagulation
K1 Landfill leachate
K1 Tratamiento de aguas residuales
K1 Electrocoagulación
K1 Lixiviados de vertedero
K1 3102 Ingeniería Agrícola
K1 3106 Ciencia Forestal
AB 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.
PB MDPI
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/59490
UL https://uvadoc.uva.es/handle/10324/59490
LA eng
NO Molecules, 2021, vol. 26, n. 21, 6425
NO Producción Científica
DS UVaDOC
RD 16-jun-2024