Catalytic ozonation of bio-treated coking wastewater in continuous pilot- and full-scale system: Efficiency, catalyst deactivation and in-situ regeneration

He, Can; Wang, Jianbing; Wang, Chunrong; Zhang, Chunhui; Hou, Pin; Xu, Xieyang

doi:10.1016/j.watres.2020.116090

Cited by 65 publications

(25 citation statements)

References 64 publications

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“…The long-term continuous catalytic ozonation for the treatment of BCW was conducted with the full-scale IR system. The COD removal during the long-term operation was investigated in our previous study [27], but the removal of organic compounds in different running times was not studied. Thus, the 16 PAHs present in the influent and the effluent of IR system were analyzed on day 15 and 487 of operation, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, the three-dimensional excitation-emission matrix fluorescence (3DEEM) and the ultraviolet absorbance at 254 nm (UV254) were monitored. The parameters of the full-scale application system are the same as those of the previous study [27]. As depicted in Figure 2d, the IR has two sections, i.e., ozone absorption section and catalytic ozonation section consisted of catalyst bed and catalytic reaction section.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The Mn x Ce 1-x O 2 /γ-Al 2 O 3 catalyst was prepared by impregnation-calcination as described by He et al [27]. Upon impregnation and calcination, the γ-Al 2 O 3 spheres were converted into a Mn x Ce 1-x O 2 /γ-Al 2 O 3 shell/core structure.…”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

“…The results demonstrated that the catalyst showed excellent catalytic activity and structural stability for practical application. In our previous study [27], a long-term pilot-scale and full-scale study on the advanced treatment of coking wastewater by catalytic ozonation with an Mn x Ce 1-x O 2 /γ-Al 2 O 3 catalyst were carried out. It was found that backflushing significantly improved COD removal stability in the catalytic ozonation process.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Wang

et al. 2020

Water

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In this work, the treatment of bio-treated coking wastewater (BCW) by catalytic ozonation was conducted in semi-batch and continuous flow reactors. The kinetics of chemical oxygen demand (COD) removal were analyzed using BCWs from five coking plants. An integral reactor with catalytic ozonation stacked by ozone absorption (IR) was developed, and its efficiency was studied. The catalyst of MnxCe1-xO2/γ-Al2O3 was efficient in the catalytic ozonation process for the treatment of various BCWs. The chemical oxygen demand (COD) removal efficiencies after 120 min reaction were 64–74%. The overall apparent reaction rate constants were 0.0101–0.0117 min−1, which has no obvious relationship with the initial COD of BCW and pre-treatment biological process. The IR demonstrated the highest efficiency due to the enhancement of mass transfer and the utilization efficiency of ozone. Bypass internal circulation can further improve the reactor efficiency. The optimal results were obtained with the ozone absorption section accounting for 19% of the valid water depth in the reactor and 250% of circulation flow ratio. The long-term and full-scale application of the novel reactor in a continuous mode indicated stable removal of COD and polycyclic aromatic hydrocarbons (PAHs). The results showed that the system of IR is a promising reactor type for tertiary treatment of coking wastewater by catalytic ozonation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Wang

et al. 2020

Water

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Efficient treatment of salty organic wastewater by α‐MnO₂‐N/C synergistic catalytic ozonation: Effect and mechanism

Shao

et al. 2023

AIChE Journal

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A novel and efficient α‐MnO2‐N/C@active carbon (AC) catalyst was proposed and synthesized through a surface modification method based on imprinting process. Uniformly dispersed α‐MnO2 and N/C sites were constructed simultaneously and the competitive adsorption of metal precursors with nonmetal precursors was avoided. Conformational relationship of α‐MnO2‐N/C@AC revealed that α‐MnO2 and graphite N were the main active sites, cleverly forming synergistic catalytic effect, which results in a good degradation effect for two actual printing and dyeing wastewater. The removal rate of chemical oxygen demand (COD) could reach 78% and 58% within 60 min, respectively, and it maintained stable after 20 repetitions without leaching of metal ions. Mechanistic investigation demonstrated that N/C sites rapidly adsorbed ozone to generate ·O2− and synergistically catalyzed with adjacent α‐MnO2 sites to further produce ·OH, significantly facilitating the generation of ·OH. This work provides a promising strategy to synthesize novel and efficient catalysts for ozone catalytic oxidation process.

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Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

Kumar

Gopinath

Ranjith

et al. 2022

CLEAN Soil Air Water

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The integrated steel industry is considered as one of the important industrial sectors, and its outputs are inputs for other sectors including construction, engineering, medical and scientific equipment, and defence. Massive production, consumption, and export of steel signify a country's economic index. This review outlines the World's steel production quantities, the processes involved, and wastewater generation from the industry and its treatment. Wastewater generated from steel plants is highly complex and requires intensive treatment before discharge into natural water bodies. Technologies adopted for treating wastewater generated from steel industries are deliberated, focusing on coking wastewater treatment. Microbial mediated processes provide an effective means of degrading the contaminants, but the toxicity of certain compounds during higher pollutant load inhibits its further treatment. However, these processes can be integrated with either electrochemical technologies or advanced oxidation processes (AOPs), which can reduce the toxicity level. Hence, when a highly concentrated and complex mixture of contaminants is considered, an integrated approach is a resourceful option in terms of cost‐effectiveness and treatment efficiency.

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Catalytic ozonation of bio-treated coking wastewater in continuous pilot- and full-scale system: Efficiency, catalyst deactivation and in-situ regeneration

Cited by 65 publications

References 64 publications

Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Efficient treatment of salty organic wastewater by α‐MnO₂‐N/C synergistic catalytic ozonation: Effect and mechanism

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

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Catalytic ozonation of bio-treated coking wastewater in continuous pilot- and full-scale system: Efficiency, catalyst deactivation and in-situ regeneration

Cited by 65 publications

References 64 publications

Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Treatment of Bio-Treated Coking Wastewater by Catalytic Ozonation with Semi-Batch and Continuous Flow Reactors

Efficient treatment of salty organic wastewater by α‐MnO2‐N/C synergistic catalytic ozonation: Effect and mechanism

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

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Product

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Efficient treatment of salty organic wastewater by α‐MnO₂‐N/C synergistic catalytic ozonation: Effect and mechanism