Catalytic Efficiency of Red Mud for the Degradation of Olive Mill Wastewater through Heterogeneous Fenton's Process
authors Domingues, E; Assuncao, N; Gomes, J; Lopes, DV; Frade, JR; Quina, MJ; Quinta-Ferreira, RM; Martins, RC
nationality International
journal WATER
author keywords Fenton's process; red mud; toxicity assessment; phenolic acids; heterogeneous catalysts
keywords HYDROGEN-PEROXIDE; CORBICULA-FLUMINEA; OXIDATION PROCESS; ION-EXCHANGE; OIL MILLS; OZONATION; BIODEGRADABILITY; CYTOTOXICITY; PARABENS; SYSTEMS
abstract Olive mill wastewater is a challenging effluent, especially due to its toxicity related to the presence of phenolic compounds. Fenton's process was analysed on the abatement of phenolic acids typically found in this kind of effluents. To overcome the main drawback of Fenton's process, a waste from the aluminium industry commonly called red mud was used as a heterogeneous source of iron. The adsorption of simulated effluent on the red mud was negligible. Therefore, the degradation of phenolic acids during Fenton's process was due to oxidation by hydroxyl radicals. The amount of red mud and hydrogen peroxide were optimized regarding phenolic acids degradation. The optimal conditions leading to the highest removal of contaminants (100% of phenolic acids degradation and 25% of mineralization after 60 min of reaction) were 1 g/L of catalyst and 100 mg/L of hydrogen peroxide. The possibility of recovering treated water for agricultural purposes was evaluated by assessing the toxic impact over a wide range of species. The toxicity observed for the treated samples was mainly related to the residual hydrogen peroxide remaining after treatment.
publisher MDPI
issn 2073-4441
year published 2019
volume 11
issue 6
digital object identifier (doi) 10.3390/w11061183
web of science category Water Resources
subject category Water Resources
unique article identifier WOS:000475346300071
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journal impact factor 2.069
5 year journal impact factor 2.250
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