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

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.

Performance Analysis of Various Advanced Oxidation Processes on COD Removal from Raw Petroleum Refinery Effluent

“…In this case, the amount of unused oxidant could put formed hydroxyl radicals to be in severe competitive environment with other organic contaminants influencing oxidation efficiency. 20,21) In other perception, those hydroxyl radicals available in the solution system might be consumed by the excess amount of H 2 O 2 . 22) Furthermore, the effect of TiO 2 and ZnO loading on COD removal rate from PRE was also displayed in .…”

Physico‐chemical processes

“…Domingues et al (2019) used red mud as a heterogeneous source of iron for Fenton process to degrade phenolic acids. Results showed that phenolic acids were degraded totally after 60 min under optimal conditions, and the remained hydrogen peroxide was the source of toxicity after treatment.…”

Using Iron-Containing Metal Oxide as Catalyst for Heterogeneous Fenton Process in Textile Industry Wastewater

“…The oxidation reactions generally follow as below Eq. (1)-(4) (Sani et al, 2020 (Buthiyappan and Raman, 2019;Domingues et al, 2019;Xia et al, 2017). In recent years, metal oxides, which have properties such as low toxicity, low cost and chemical stability as catalysts in the Heterogeneous Fenton process, have been of great interest.…”