Bioleaching of tungsten-rich spent hydrocracking catalyst using Penicillium simplicissimum

Amiri, F.; Yaghmaei, Soheila; Mousavi, Seyyed Mohammad

doi:10.1016/j.biortech.2010.08.087

Cited by 104 publications

(51 citation statements)

References 16 publications

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“…Hydrometallurgical processes, by acidic leaching or alkaline leaching, are popular ways [14][15][16] among these proposals. The main idea of these processes is to selectively transfer metal ions from solid waste into solution.…”

Section: Introductionmentioning

confidence: 99%

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Huo

Chang

et al. 2014

Waste Biomass Valor

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The catalytic removal of NO x technologies must pay attention to waste selective catalytic reduction (SCR) catalysts, which are the traditional commercial V 2 O 5 -WO 3 / TiO 2 catalysts. Our work focuses on the progress in green reclamation and green chemistry for dealing with the spent SCR catalysts with sustainability perspectives. The problem outlined deals largely with the study of a feasible preparation way for visible-light-sensitive BiVO 4 /Bi 2 WO 6 heterojunction photocatalyst, which was synthesized via a hydrothermal process through waste SCR catalysts. In this paper, the simulated waste SCR catalyst dissolved by sodium hydroxide (NaOH) solution was proposed. V 2 O 5 and WO 3 were dissolved heavily while TiO 2 was rarely dissolved by sodium hydroxide. Afterword, the dissolved vanadium and tungsten in leaching solution were used to produce BiVO 4 /Bi 2 WO 6 heterojunction through a hydrothermal process at 160°C, which can be used as photocatalyst. The photocatalytic performance of the BiVO 4 /Bi 2 WO 6 sample was evaluated by degradation of methylene blue in aqueous solution under visible light irradiation, which attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the heterojunction between Bi 2 WO 6 and BiVO 4 .

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Section: Introductionmentioning

confidence: 99%

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Huo

Chang

et al. 2014

Waste Biomass Valor

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“…The concentrations of organic acid increased as the sucrose concentration increased in the fungal bioleaching experiment. Amiri et al [43] reported that the decrease in the fungus growth rate caused the consumption of organic acids in the late stage of the bioleaching experiment, resulting in a less organic acid production (Figure 2). Figure 3 illustrates the effect of solid content on the removal of heavy metals from sewage sludge.…”

Section: Variation Of Organic Acidsmentioning

confidence: 99%

“…It is noticed that the increase in the efficiency of metal removal was related to the increase of the organic acid concentrations, indicating that the biogenically produced organic acids played a direct and important role in the fungal bioleaching process. Therefore, the depletion of bioleaching agents could be one reason in decreasing the efficiency of metal removal [43]. Figure 4 shows the effect of sucrose concentrations on the removal of heavy metals during the fungal bioleaching experiment.…”

Section: Variation Of Organic Acidsmentioning

confidence: 99%

Effects of Solid Content and Substrate Concentration on Bioleaching of Heavy Metals from Sewage Sludge Using Aspergillus niger

Chen¹,

Wang²

2019

Metals

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The presence of heavy metals in sewage sludge not only affects the performance of sludge anaerobic digestion process but also restricts the land application of treated sewage sludge. Therefore, a fungi-mediated bioleaching process for simultaneous metal leaching and sludge digestion by Aspergillus niger was developed to treat the sewage sludge containing heavy metals in this study. The effects of two important parameters, sludge solid content and substrate (sucrose) concentration, on the performance of fungal bioleaching were investigated in this study. The results showed that the rate of pH reduction increased with increasing sludge solid contents and sucrose concentrations. In this study, the efficiency of metal removal decreases in the order of Mn > Zn > Ni > Pb. The efficiencies of metal leaching and solid degradation (SS and VSS) were found to be decreased with an increase of sludge solid content and a decrease of sucrose concentration. At 2 days of reaction time, the maximum efficiency of metal solubilization was 95, 56, 21 and 13% for Mn, Zn, Ni and Pb, respectively.

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“…The amount of spent catalysts has increased in recent years owing to the rapid growth in diesel hydrotreatment capacity. Spent catalysts are regarded as solid wastes and have raised environmental awareness [2]. Spent catalysts containing plentiful hydrocarbon pollutants and heavy metals, e.g., V and Ni, have been tagged as hazardous wastes by the U.S. Environmental Protection Agency [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Stress on Deoiling of Oil‐Contaminated Catalysts in a Hydrocyclone

Liu

Zhang

et al. 2016

Chem Eng & Technol

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Shear stress provided by a hydrocyclone was employed to remove the oil from oilcontaminated catalysts. Understanding the deoiling mechanism and quantitative analysis of the interaction between shear stress fields and deoiling are necessary to improve deoiling efficiency. A numerical simulation was conducted for the velocity field and shear stress field of a hydrocyclone. The shear stress field in the wall layer, where oil-contaminated catalysts are usually located, was robust. Increasing inlet flow rates resulted in a higher shear rate distribution along the wall layer. Numerical results were compared with experimental data. In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. Deoiling by the shear stress of a hydrocyclone is an efficient method for cleaning oil-contaminated catalysts within a short time.

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Bioleaching of tungsten-rich spent hydrocracking catalyst using Penicillium simplicissimum

Cited by 104 publications

References 16 publications

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Effects of Solid Content and Substrate Concentration on Bioleaching of Heavy Metals from Sewage Sludge Using Aspergillus niger

Effect of Shear Stress on Deoiling of Oil‐Contaminated Catalysts in a Hydrocyclone

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