Abstract
Spent Merox caustic (SMC) is a hazardous waste that is produced during the Merox desulfurization process in the petroleum refinery industry and should be treated before discharging to environment. In the present study, treatment of SMC was investigated by three methods including Fenton-like process, foam fractionation, and a combination of both processes. Immobilized TiO2/Fe0 on modified silica nanoparticles was used as a heterogeneous Fenton-like catalyst. The chemical and physical characteristics of the catalyst were determined using Fourier-transform infrared spectroscopy, X-ray diffraction, diffuse reflectance spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and transmission electron microscopy techniques. The treatment performance of the combined method was measured as a cost-effective method with chemical oxygen demand (COD) removal percentage. The effect of parameters including pH, gas flow rate, surfactant type and concentration of hydrogen peroxide, catalyst, and chelate were investigated. It is found that the prepared heterogeneous catalyst has high activity for the treatment of SMC. In addition, the results showed that the combined method achieved 97.6 ± 0.5% COD removal, while the measured values for Fenton or foam fractionation methods alone did not exceed 85.5 ± 1% and 47.2 ± 0.4%, respectively. The advantage of combination process over foam fractionation was the use of an advanced oxidation process in the separating column to eliminate or reduce the secondary phase contamination load. Besides, the role of the column in the effective contact of contaminants with the rising bubbles improved the degradation performance of the proposed process and reduced the consumption of hydrogen peroxide by 46% compared to the Fenton-like method.
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Data availability
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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HT conducted the experiments and also co-wrote the article. HSH has analyzed identification analyzes and has also participated in writing the text. AL and PD also wrote the final text and also participated in the analysis of the results. All authors read and approved the final manuscript.
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Tahmouresinejad, H., Darvishi, P., Lashanizadegan, A. et al. Treatment of Olefin plant spent caustic by combination of Fenton-like and foam fractionation methods in a bench scale. Environ Sci Pollut Res 29, 52438–52456 (2022). https://doi.org/10.1007/s11356-022-19364-y
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DOI: https://doi.org/10.1007/s11356-022-19364-y