Abstract
The present study is conducted to compare the performance of different oxidation processes such as the solar photo-Fenton, the solar photocatalyst of TiO2 and solar photocatalyst of TiO2/Fenton process for the treatment of petroleum wastewater from Sohar oil refinery (SOR) by a central composite design (CCD) with response surface methodology (RSM). The degradation efficiency is evaluated in terms of chemical oxygen demand (COD) and total organic carbon (TOC) reductions. The solar photocatalyst of TiO2/Fenton method improved the performance of photocatalyst TiO2 in the normal value of pH (7) for petroleum wastewater, therefore no need to adjust pH during this treatment. In acidic conditions pH 7. The TiO2 dosage and pH are the two main factors that improved the TOC and COD removal in the solar photocatalyst of TiO2/Fenton and the solar photocatalyst of TiO2 processes while the pH and H2O2 concentration are the two main factors in the solar photo-Fenton process.
Highlights
One of the major problems facing industrialized nations is contamination of the environment by hazardous chemicals
The solar photo-Fenton process is more efficient for petroleum wastewater treatment than the solar photocatalyst of TiO2 process in acidic conditions pH
While initial concentration of chemical oxygen demand (COD) is actual factor for the solar photocatalyst of TiO2 [11]. Different oxidation processes such as the solar photo-Fenton, the solar photocatalyst of TiO2, and solar photocatalyst of TiO2/Fenton processes are conducted to compare their performances in the treatment of petroleum wastewater by a central composite design (CCD) with response surface methodology (RSM)
Summary
One of the major problems facing industrialized nations is contamination of the environment by hazardous chemicals. Advanced oxidation processes (AOPs) have capability of rapid degradation of recalcitrant pollutants in the aquatic environment. Remediation of hazardous substances is attributed to hydroxyl radical. A hydroxyl radical has the potential to destroy and degrade organic pollutants [1]. In the solar photocatalyst of TiO2, when TiO2 exposed to sunlight, a hole in the valence band and an electron in the conduction band are generated by light induction. This hole causes the oxidation of hydroxyl ions and produces the hydroxyl radicals at the TiO2 surface. While in the photo-Fenton process, formation of hydroxyl radicals based on reaction between Fe+2 and H2O2 under sunlight irradiation. In treatment of non-biodegradable and toxic compounds, the photocatalytic processes have shown promising results [3]
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