Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

Zeng, Xu; Liu, Jun; Zhao, Jianfu

doi:10.1371/journal.pone.0199520

Cited by 19 publications

(13 citation statements)

References 29 publications

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“…In our previous study, we also investigated several catalysts for the wet oxidation of pharmaceutical sludge and wastewater. We found that the prepared Cu–Ce/γ-Al 2 O 3 catalyst has good performance 28 – 30 . The catalyst was synthesized by a typical wet impregnation procedure.…”

Section: Resultsmentioning

confidence: 80%

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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: 80%

“…We examined the performance of the prepared catalyst in catalytic wet oxidation of pharmaceutical sludge 30 . It was found that the highest removal rates for VSS (87.3%) and COD (72.6%) were achieved at 260 °C over 60 min with an oxygen pressure of 1.0 MPa and 10 g·L −1 of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Wet oxidation and catalytic wet oxidation of pharmaceutical sludge

Zeng

Zhao

2023

Sci Rep

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“…The light-harvesting centers and catalytic active sites are ideal in homogenous photocatalysts in comparison to heterogenous photocatalysts. The coordination chemistry has been utilized to unite the merits of homogenous and heterogenous photocatalysts to upgrade the photocatalysis process (Zeng et al, 2018). The homogeneous photocatalyst frequently uses the ozone and photo-Fenton processes (Capodaglio 2020).…”

Section: Homogenous Photocatalysismentioning

confidence: 99%

Recent advances in the elimination of persistent organic pollutants by photocatalysis

Gaur

Dutta

Singh

et al. 2022

Front. Environ. Sci.

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The non-ending needs of growing human population are being met by rapid industrialization and globalization, which have nowadays become an indispensable component of growth. Although these activities have led to phenomenal growth of the human civilization, at the same time, they have resulted in severe environmental pollution by discharge of highly toxic waste. This waste is severely detrimental not only for the environment but also for the health of the human population. Among different classes of pollutants, one being considered as one of the highly toxic ones is that of persistent organic pollutants (POPs). Advanced oxidation technologies (AOTs) play a major role in the degradation of pollutants by converting organic pollutants into CO2, H2O, and mineralized inorganic ions. AOTs include UV-based photocatalysis, ozonation, electrochemical oxidation, and Fenton and Fenton-like processes There are some difficulties and challenges associated with AOT, such as being highly capital intensive and high consumption of energy. To overcome these bottlenecks, photocatalytic degradation is a promising method that uses solar energy for the degradation of such pollutants. Photocatalysis is further classified into homogenous and heterogenous photocatalysis. As a part of heterogenous photocatalysis, semiconductor photocatalysts have received great attention; but because of their drawbacks such as the recombination of the electron/hole pair, low adsorption rate, and low surface area coverage, nanotechnology was considered for bringing a novel and enhanced remediation photocatalysis process. To this end, the designing of a more efficient photocatalyst by modifying morphology, composition, and structure and reducing toxicity is the need of the hour for the abatement of environmental pollutants. This review focuses on the degradation and removal of highly toxic persistent organic pollutants by using photocatalytic degradation with a detailed account of the various pollutants, their degradation mechanism, process shortcomings, remedial measures, and future prospects.

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“…They also highlighted the potential for recovery of valuable compounds from sewage sludge when combined with post-treatments. Hydrothermal processing can be applied to a diverse range of wet organic materials for a variety of applications such as domestic sewage, biosolids, pharmaceuticals, and agricultural wastes for waste treatment, pretreatment of lignocellulosic feedstocks to enhance enzymatic degradation, pretreatment of sewage sludge to improve anaerobic digestion, hydrothermal carbonization of biomass for production of hydro-char and biofuel, and hydrothermal processing of inorganics for nanoparticle synthesis ( Debellefontaine and Foussard, 2000 ; Hii et al., 2014 ; Ruiz et al., 2020 ; Sharma et al., 2020 ; Yang and Park, 2019 ; Yousefifar et al., 2017b ; Zeng et al., 2018 ; Zhan et al., 2020 ). For the decentralised treatment of household toilet waste, HP is particularly an attractive technology because of the short processing times at high temperatures, the considerable reductions in waste solids and pathogens and the potential for resource recovery.…”

Section: Introductionmentioning

confidence: 99%