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Catalytic Efficiency of Red Mud for the Degradation of Olive Mill Wastewater through Heterogeneous Fenton’s Process

Authors :
Eva Domingues
Nelson Assunção
João Gomes
Daniela V. Lopes
Jorge R. Frade
Margarida J. Quina
Rosa M. Quinta-Ferreira
Rui C. Martins
Source :
Water, Vol 11, Iss 6, p 1183 (2019)
Publication Year :
2019
Publisher :
MDPI AG, 2019.

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.

Details

Language :
English
ISSN :
20734441
Volume :
11
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Water
Publication Type :
Academic Journal
Accession number :
edsdoj.6a587ad8d1d440cb46498f88e3a394f
Document Type :
article
Full Text :
https://doi.org/10.3390/w11061183