Conventional Reactors and Microreactors in Electro-Fenton

Panizza, Marco; Scialdone, Onofrio

doi:10.1007/698_2017_39

Cited by 3 publications

(4 citation statements)

References 149 publications

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“…Despite being a promising technology, research on EF has been performed mostly at a lab scale, and less attention has been paid to aspects such as equipment, scale-up or economic issues, which should be tackled in order to treat real wastewater at industrial scale [3]. Investigations at lab scale have been extensively performed in mixed-tank cells with electrodes arranged in a parallel-plate configuration, where compressed air or oxygen is bubbled into the solution so as to provide the oxygen required for the in situ generation of hydrogen peroxide [4,5]. However, this layout presents several bottlenecks preventing the full-scale application of EF, such as energy consumption issues, mass transfer limitations and low solubility of oxygen [5,6].…”

Section: Introductionmentioning

confidence: 99%

Towards a more realistic heterogeneous electro-Fenton

Poza-Nogueiras

Moratalla

Sáez

et al. 2021

Journal of Electroanalytical Chemistry

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With the aim of bringing the heterogeneous electro-Fenton (EF) treatment one step closer to a more realistic operation, the scaling-up of that technology was evaluated. Assays were performed firstly at lab scale in a stirred-tank reactor and then at bench scale in a flow setup including a jet aerator and a microfluidic flow-through electrochemical cell. A fluidized-bed reactor was added to the bench-scale installation in order to retain the solid catalyst, iron-containing alginate beads. To the best of the authors' knowledge, there are no precedent studies reporting a heterogeneous EF treatment in a similar bench scale-configuration. Hydrogen peroxide generation and clofibric acid removal were assessed at both scales at current intensities of 0.12 and 0.25 A. Results showed that the scaled-up treatment was more efficient and cost-effective: at bench scale 18 times more volume was treated, the mass production of hydrogen peroxide was 28 higher and the specific cost for the removal of clofibric acid was cut by more than half. The most efficient treatment turned out to be the EF performed at 0.12 A at bench scale. Those results highlighted the importance of the reactor design in the scaling-up process. Additionally, aromatic intermediates were detected by liquid chromatography-mass spectrometry (LC-MS) and a degradation route was suggested. Carboxylic acids were also measured by HPLC confirming that the pollutant is mineralizing.

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Section: Introductionmentioning

confidence: 99%

Towards a more realistic heterogeneous electro-Fenton

Poza-Nogueiras

Moratalla

Sáez

et al. 2021

Journal of Electroanalytical Chemistry

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“…Comparatively, most of the studies have been focused on the influence of the electrode material and operating conditions and less attention has been paid to other aspects of cell design [7,8]. Traditionally, EF has been extensively applied in either simple stirred tank reactors or in parallel-plate flow-by cells [1,9]. Despite the positive results achieved by conventional EF reactors so far, there is still work to be done to speed up and reduce costs of this technology in order to make it a reliable and competitive alternative on an industrial scale [10].…”

Section: Introductionmentioning

confidence: 99%

On the design of a jet-aerated microfluidic flow-through reactor for wastewater treatment by electro-Fenton

Pérez

Llanos

Sáez

et al. 2019

Separation and Purification Technology

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“…21−23 Until now, little scientific attention has been paid to the development of efficient reactors (most of it comes from companies) and most of the works devoted to wastewater treatment in the literature use stirred-tanks cells or parallel-plate flow-by reactors. 24,25 Recently, parallel-plate flow-by microfluidic (MF) electrochemical cells have been evaluated for the treatment of wastewater containing biorefractory organic pollutants. 18,26 The main advantage of a microfluidic cell is the minimum ohmic drop in the electrolyte thanks to an interelectrode gap in the order of micrometers.…”

Section: Introductionmentioning

confidence: 99%

“…A great deal of effort has been put in order to develop new processes. − In this context, the electrochemical cell design has a major role in the performance of the electrochemical processes and hence in its efficiency. − Until now, little scientific attention has been paid to the development of efficient reactors (most of it comes from companies) and most of the works devoted to wastewater treatment in the literature use stirred-tanks cells or parallel-plate flow-by reactors. , …”

Section: Introductionmentioning

confidence: 99%

Toward the Development of Efficient Electro-Fenton Reactors for Soil Washing Wastes through Microfluidic Cells

Rodríguez

Muñoz-Morales

Pérez

et al. 2018

Ind. Eng. Chem. Res.

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This work focuses on the coupling of three different approaches into the same reactor at 11 the same time: microfluidic cells, anodic oxidation with diamond anodes and an electro-12 Fenton process. In order to supply oxygen a jet aerator was used and a CB/PTFE 13 Duocel ® Al foam cathode was installed to promote the formation of hydrogen peroxide. 14 This novel concept is applied for the direct treatment (without the addition of salts or 15 other reagents) of soil washing wastes obtained in the remediation of soil spiked with 16 clopyralid. Results obtained pointed out that this approach can increase the efficiency of 17 the process by folds as compared to traditional treatment technologies. The chemical 18 analysis of the intermediates showed different reaction mechanisms: anodic oxidation, 19 electro-Fenton and a negligible contribution of coagulation. The coupled system studied 20 in this work present several advantages such as high treatment efficiency and short 21 treatment time which indicates that the development of electrochemical reactors for 22 diluted liquid wastes is progressing in an adequate direction.

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Conventional Reactors and Microreactors in Electro-Fenton

Cited by 3 publications

References 149 publications

Towards a more realistic heterogeneous electro-Fenton

Towards a more realistic heterogeneous electro-Fenton

On the design of a jet-aerated microfluidic flow-through reactor for wastewater treatment by electro-Fenton

Toward the Development of Efficient Electro-Fenton Reactors for Soil Washing Wastes through Microfluidic Cells

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