Improvement of (transition metal-modified) activated carbon regeneration by H2O2-promoted catalytic wet air oxidation

Imane Benhamed (1) , Laurie Barthe (1) , Rachid Kessas (2) , Henri Delmas (1) , Carine Julcour-Lebigue (1)

1 LGC - Laboratoire de Génie Chimique
2 USTO MB - Université des sciences et de la Technologie d'Oran Mohamed Boudiaf [Oran]

Oxidative regeneration of activated carbon (AC) exhausted with phenolic compounds is still a challenging issue due to the frequent porosity loss. Addition of low H2O2 amount is investigated as a way to promote catalytic wet air oxidation (CWAO) of adsorbed pollutants and thereby to recover absorbent properties. Commercial AC and transition metal (iron or copper)-modified counterparts are tested in repeated adsorption/batch peroxide-promoted CWAO of phenol. Cycles are operated in both fixed bed and slurry reactors to vary the initial pollutant distribution in between the two phases. Influence of metal location is also studied by adding iron salt to the pollutant solution prior to perform peroxide-promoted oxidation on bare carbon. Regeneration results are analyzed through a detailed analysis of both the solid and the liquid phases during the oxidative treatment. It is proved that a convenient H2O2 dosage can increase the lifetime of adsorbent in adsorption–oxidation cycles, but coupling with (un)supported metal oxide does not provide significant gain.

Mots clés: Wastewater treatment; Sequential process; Adsorption; Advanced oxidation; Phenol

Domaines: Autre; Génie chimique; Ingénierie de l'environnement

Imane Benhamed, Laurie Barthe, Rachid Kessas, Henri Delmas, Carine Julcour-Lebigue. Improvement of (transition metal-modified) activated carbon regeneration by H2O2-promoted catalytic wet air oxidation. Environmental Technology, 2018, 39 (21), pp.2761-2770. ⟨10.1080/09593330.2017.1365942⟩. ⟨hal-01879931⟩