Abstract
Our studies focused on assessing the effectiveness of the heterogeneous photocatalysis method (TiO2/UV) and examining the feasibility of photocatalysis coupling with hydrogen peroxide in the treatment of oily industrial wastewater. Our oily water sample was taken from the de-oiling Haoud Berkaoui station entering, which is located 770 km in southern of Algiers); the AOPs investigated are TiO2/UV (photocatalysis) and TiO2/UV/Fe2+/H2O2 (photocatalysis–Fenton’s reagent). This method is used as an alternative or in addition to the conventional treatment techniques (coagulation–flocculation–decantation and filtration…etc). In this work, first we copulated between the two photocatalytic methods (TiO2/UV) and the Fenton’s reagent (H2O2/Fe+2) and then we studied the effect of various experimental factors on the treatment process: pH, initial concentration for each of the TiO2, H2O2, Fe2+, and oil pollutants and finally temperature. The study showed a marked improvement in efficiency on the treated water quality in terms of color, turbidity, and COD under optimized conditions (oil concentration, quantity of catalysts, temperature, Fenton’s reagent concentration, and the pH of the solution).
Highlights
The search for alternative methods for the treatment of oily wastewater has led to discover new technologies
The optimum TiO2 dosage in combined system achieved was 0.8 g/l. TiO2 dosage greater than the maximum value (0.8–1 g/l) has a negative effect on this process since the excess TiO2 particles increase the turbidity of the solution that will decrease the penetration of light into the solution, resulting in a reduction in production of hydroxyl radicals (OH·) at the TiO2 surface available to degrade the organic compounds in the oily water
We studied the efficiency of combining two treatment methods with an ultraviolet light source for oily wastewater treatment
Summary
The search for alternative methods for the treatment of oily wastewater has led to discover new technologies. Among these technologies, the so-called advanced oxidation processes (AOPs) are booming. The so-called advanced oxidation processes (AOPs) are booming This technology is based on the production of non-selective reactive oxidative species that will enable the oxidation of a large number of organic pollutants (Glaze et al 1987; Bauer and Fallmann 1997). 1. Chemical oxidation processes (H2O2/Fe2+ and H2O2/O3) (Klavarioti et al 2009); 2. Photocatalytic processes (H2O2/UV, O3/UV) (Fe2+/ H2O2/UV and TiO2/UV); 3. Electrochemical oxidation processes (Klavarioti et al.2009)
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