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This research is part of the projects PID2022-137828OB-I00 (EMULREM) and PDC2022-133095-I00 (VAL-REMSURFOX) funded by MCIN/AEI/10.13039/501100011033. Project TEC-2024/ECO-69 (CARESOIL-CM) funded by the Community of Madrid is also acknowledged. Y. Moreno-De la Fuente acknowledges the Spanish State Investigation Agency for the grant PREP2022-000074 funded by MICIU/AEI/10.13039/501100011033 and FSE + .

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Removal of antracene and benzo[a]pyrene from soil-washing synthetic emulsions by Fenton and solar photo-Fenton oxidation

Publicado en:Journal Of Water Process Engineering. 75 107959- - 2025-06-01 75(), DOI: 10.1016/j.jwpe.2025.107959

Autores: Ayedi, Karima; Fuente, Yaiza Moreno-De La; Herraiz-Carbone, Miguel; Cotillas, Salvador; Prisciandaro, Marina; Santos, Aurora; Dominguez, Carmen M

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This study examines the treatment of polycyclic aromatic hydrocarbons (PAHs) aqueous emulsions, equivalent to those obtained from soil-washing, using Fenton and solar photo-Fenton oxidation for pollutant removal and surfactant recovery in water treatment applications. PAHs, persistent contaminants in industrial wastewater, require sustainable treatment approaches. Soil was contaminated with anthracene (ANT) and benzo[a]pyrene (BaP) and washed with sodium dodecyl sulfate (SDS) at a mass liquid-to-soil ratio of 2:1, with SDS concentrations ranging from 2500 to 10,000 mg L-1. A synthetic emulsion (SDS: 4500 mg L-1, ANT: 5 mg L-1, BaP: 5 mg L-1) was prepared and treated using low oxidant (H2O2: 60-240 mg L-1) and catalyst (Fe: 2.5-10 mg L-1) dosages to optimize reagent consumption. The Fenton process (pH = 3) achieved complete PAHs removal, with BaP fully degraded under all conditions and ANT requiring higher oxidant (H2O2, 240 mg L-1) and catalyst (Fe, 10 mg L-1) concentrations. The solar photo-Fenton process achieved up to 70 % ANT and 85 % BaP removal at near-neutral pH using ferrioxalate complexes (120 mg L-1 H2O2, 10 mg L-1 Fe). Minimal SDS degradation and negligible mineralization support surfactant recovery and reuse, enhancing process sustainability. These findings highlight the viability of light-assisted advanced oxidation processes for selective pollutant degradation in engineered water systems, supporting the development of cost-effective and environmentally friendly remediation technologies.

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