Optimization of Fenton's Process for the Treatment of Cotton Textile Wastewater using Response Surface Methodology

Degradation of cotton textile wastewater using Fenton’s process was investigated. The effect of individual and interactive operating parameters on the response was analyzed using central composite design (CCD), a commonly used form of response surface methodology (RSM). The operating parameters selected were pH, dosage of hydrogen peroxide, dosage of iron and the responses (dependent parameters) were chemical oxygen demand (COD) and colour. The model derived correlation coefficients R2 and R2 adj for COD were 0.982 and 0.966, respectively and the values were almost similar for colour also. The optimum values for various operating parameters namely pH, H2O2 and Fe2+ dosage were found to be 3.33, 60.57 and 1.56 mM, respectively for electrolysis time of 60 min. By performing the experiments with these values of operating parameters, the COD and colour removal efficiencies were found to be 83.5% and 98.1%, respectively.

Oxidative removal of stabilized landfill leachate by Fenton's process: process modeling, optimization & analysis of degraded products

In this study, the stabilized landfill leachate which has a BOD : COD ratio of 0.045 was treated using Fenton's process.

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

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.

Detoxification of Olive Mill Wastewaters by Fenton’s Process

Olive mill wastewaters (OMW) constitute an environmental problem affecting mainly Mediterranean Sea area countries where the olive mill industry is a very important economic sector. The strong impact and management issues of these effluents are mainly due to their seasonality, localized production, and high organic load with high toxic features and low biodegradability. As the olive oil industry is highly water demanding, the search for suitable water recovery strategies requires the development and optimization of advanced treatment technologies. The classical Fenton’s process is an interesting alternative, as it operates at room conditions of pressure and temperature. However, it shows some drawbacks, such as the generation of iron sludges, which require further management. Nevertheless, because of its features that make it industrially desirable, overcoming these limitations has been the focus of researchers in the last years. Bearing this in mind, this paper focuses on the recent research regarding OMW treatment using Fenton’s process. The use of Fenton’s peroxidation treatment at homogenous, heterogeneous, and photo-aided conditions is analysed. The use of solid catalysts may be an interesting way to avoid sludge formation. Light-driven Fenton can also reduce the amount of iron needed for effective degradation. Moreover, Fenton’s process integration in combined treatment schemes is discussed. Finally, remarks regarding its application at full scale are given.