Iron (II) as catalyst for thiocyanate wet oxidation: Mechanism and modelization

Oulego, Paula; Collado, Sergio; Laca, Adriana; Dı́az, Mario

doi:10.1016/j.cej.2017.02.021

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…Among various catalysts in the catalytic wet oxidation process, catalysts containing Cu 2+ or Ce 4+ have attracted considerable attention due to their good performance in the oxidation of wastewater and sludge. Copper species are less pH-dependent and have received considerable research attention in the last ten years because the redox reaction with Cu species is more stable 26 , 27 . In our previous study, we also investigated several catalysts for the wet oxidation of pharmaceutical sludge and wastewater.…”

Section: Resultsmentioning

confidence: 99%

Wet oxidation and catalytic wet oxidation of pharmaceutical sludge

Zeng

Zhao

2023

Sci Rep

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In this work, wet oxidation and catalytic wet oxidation of pharmaceutical sludge using homogeneous and heterogeneous catalysts were investigated. The results indicate that wet oxidation is a promising method for the highly efficient degradation of pharmaceutical sludge. Under optimal conditions, the highest removal efficiencies of volatile suspended solids (VSS) 86.8% and chemical oxygen demand (COD) 62.5% were achieved at 260 °C for 60 min with an initial oxygen pressure of 1.0 MPa. NaOH exhibited excellent acceleration performance on the VSS removal. The highest VSS removal efficiency of 95.2% was obtained at 260 °C for 60 min with an initial oxygen pressure of 1.0 MPa and 10 g·L−1 of NaOH. By using a Cu–Ce/γ-Al2O3 catalyst, the highest removal rates of VSS 87.3% and COD 72.6% were achieved at 260 °C for 60 min with an initial oxygen pressure of 1.0 MPa and 10 g·L−1 of catalyst. The wet oxidation reaction can be maintained itself owing to the exothermic heat. The produced low-molecular-weight carboxylic acids have potential commercial utilization as organic carbon sources in the biological wastewater treatment processes. The inorganic residues can be utilized for the building materials production. These results implied that the catalytic wet oxidation is a promising method for the volume reduction and resource utilization of pharmaceutical sludge.

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Section: Resultsmentioning

confidence: 99%

Wet oxidation and catalytic wet oxidation of pharmaceutical sludge

Zeng

Zhao

2023

Sci Rep

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“…Recently, wet oxidation has gained much attention in the disposal of hazardous compounds, such as the organic wastewater with high concentration of organic pollutants. Wet oxidation has showed high potential for the treatment of effluents which contained organic toxic contaminants with high concentrations [1][2][3]. In the wet oxidation process, free radical agent was produced under high temperature, which possesses the characteristic with high oxidation activity.…”

Section: Introductionmentioning

confidence: 99%

Wet Oxidation of Excess Activated Sludge from Coal Chemical Industry

Qin

Wang²,

Zheng³

et al. 2023

J. Phys.: Conf. Ser.

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Excess activated sludge produced from coal chemical industries has gained much attention, because of the huge volume and high hazardous risk of the sludge. The wet oxidation of coal chemical sludge was studied in this study by using a stainless steel batch reactor. The effects of reaction parameters, including the moisture content, the additional dose of sludge, reaction temperature and the additional amount of oxygen, were discussed. The results showed that the highest removal ratios of COD and TS could reach up to 72.3% and 56.4% respectively with moisture content of sludge 93%, initial oxygen pressure 1.7 MPa under 240°C for 60 min. The mass transfer processes of sludge and oxygen, and the reaction temperature, are very important parameters for the treatment. It was suggested that wet oxidation technology provides a suitable alternative method for the treatment of excess sludge from coal chemical industries.

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“…However, an additional separate step is essential to prevent secondary pollution. Hence, the heterogeneous catalysts have attracted more and more attention over the years owing to their high activity and easy separation [12,13]. Noble metal catalysts (such as Pt, Ru, Pd, Ir) supported on carbon materials or oxides (such as CeO2, ZrO2, TiO2) have been widely investigated in the CWAO of organic compounds [14,15].…”

Section: Introductionmentioning

confidence: 99%