Applying electro-Fenton process as an alternative to a slaughterhouse effluent treatment

Páramo-Vargas, Javier; Camargo, A. Mounserrath Estrada; Gutiérrez-Granados, Silvia; Godı́nez, Luis A.; Peralta‐Hernández, Juan M.

doi:10.1016/j.jelechem.2015.07.002

Cited by 27 publications

(8 citation statements)

References 35 publications

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“…Carbon-based cathodes are optimum to carry out EF, PEF and SPEF because they allow the efficient production of H2O2 at a low cost and toxicity. Among them, carbon felt [6][7][8][9][10] and air-diffusion electrodes [11][12][13][14][15][16][17] have been widely explored, being reticulated vitreous carbon [18,19] and BDD [20] more rarely employed.…”

Section: Introductionmentioning

confidence: 99%

Solar photoelectro-Fenton treatment of a mixture of parabens spiked into secondary treated wastewater effluent at low input current

Steter¹,

Brillas²,

Sirés³

2018

Applied Catalysis B: Environmental

102

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Aqueous mixtures of methyl, ethyl and propyl paraben (MeP, EtP and PrP) prepared in real urban wastewater with low conductivity were treated by solar photoelectro-Fenton (SPEF) process at low input current (j = 10 mA cm -2 ) using a pre-pilot plant with an electrochemical reactor equipped with an air-diffusion cathode to electrogenerate H2O2 and a boron-doped diamond (BDD) or RuO2-based anode. Comparative trials in simulated water matrices with or without Cl − in the absence of natural organic matter (NOM) always led to a slower decay of parabens concentration and total organic carbon (TOC). This was mainly due to the superior regeneration of Fe 2+ from photoreduction of Fe(III) complexes formed with NOM in real wastewater compared to that from Fe(OH) 2+ . In all matrices, a catalyst concentration as low as 0.20 mM Fe 2+ was enough to ensure the production of • OH in the bulk from Fenton's reaction. SPEF with BDD yielded a complete removal of parabens in 180 min and 66% mineralization at 240 min. This gave rise to the greatest mineralization current efficiencies reported so far, up to 1000%, with a low energy consumption of 84 kWh (kg TOC) -1 . The synergy between homogeneous and heterogeneous catalysis, which allowed the efficient dosage of • OH and M( • OH) at low j, with simultaneous action of high UV power from sunlight justified such a good performance. Analogous apparent rate constants were determined for MeP, EtP and PrP. Slower decays were found with RuO2-based anode due to its lower oxidation power. As a result, the MCE was 425% as maximum, but a lower energy consumption of 52 kWh (kg TOC) -1 was needed. Since the role of active chlorine was of minor importance, the formation of toxic, refractory chloroderivatives was minimized. All byproducts were transformed into malic, formic and oxalic acids prior to total mineralization.

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Section: Introductionmentioning

confidence: 99%

Solar photoelectro-Fenton treatment of a mixture of parabens spiked into secondary treated wastewater effluent at low input current

Steter¹,

Brillas²,

Sirés³

2018

Applied Catalysis B: Environmental

102

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“…It is worth to notice that the required concentration of peroxide to maximize the removal efficiency is always on its minimum value. The removal process, involves chemical oxidation and coagulation, the last one because ferric hydroxocomplexes are formed [12][13][14][15][16]. This observation is confirmed throughout different points of the process: a) the presence of flocs which at the end are measured as settled solids (approximately 30 mL L , Fe t and Fe 3+ indicates that iron is removed from the solution [17].…”

Section: Cod T T − − − −mentioning

confidence: 69%

Modeling the Fenton Depuration of the Effluent from a Slaughterhouse based on Design of Experiments

Peralta‐Hernández¹

2017

MOJES

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In an effort to improve the quality of treated water, the implementation of a new technology referred to as Advanced Oxidation Processes (AOP) is being examined, either alone or in combination with other processes. When working with real conditions there are sometimes changes which involve adjustments of the process, and it is easier to perform such adjustments when it has a reliable mathematical model. The studied scaled design referred to as Fenton treatment, involving the use of a central-composite design (quadratic model) which was tested on the effluent discharge of a slaughterhouse. As a result of our treatability study, we experienced removal efficiencies based on chemical oxygen demand (COD) greater than 85%, while ascertaining that removal process was the result of chemical oxidation and coagulation.

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“…This is feasible because a 3D ADE ensures a remarkably high efficiency for O2 reduction by reaction (1) since it is not limited by the mass transfer of the gas such as occurs with immersed cathodes that are feed with the dissolved O2 in solution. Among the latter kinds of cathodes, carbon felt [14][15][16][17][18],…”

Section: Introductionmentioning

confidence: 99%

Mass transfer and residence time distribution in an electrochemical cell with an air-diffusion electrode: Effect of air pressure and mesh promoters

Walker

Cavalcanti

Atrashkevich

et al. 2021

Electrochimica Acta

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Electrochemical advanced oxidation processes (EAOPs) have shown excellent capabilities to the abatement of recalcitrant organic pollutants. The Fenton-based electrochemical systems have shown great performance for in-situ generation of H2O2, allowing an efficient • OH production for the mineralization of organic pollutants. These systems have been widely applied at bench scale; however, studies to scale-up to a higher technology readiness level (TRL) are lacking. One of the main scale-up challenges of the Fenton-based systems is the implementation of air diffusion electrodes (ADE) in flow-by electrochemical cells. The ADE adds additional complexity with respect to mass transfer effects due to hydraulic reactor design and ADE gas pressure control. Therefore, this work experimentally investigated residence time distribution and platinum-sheet electrode mass transfer effects due to (a) the liquid cross-flow velocity through the electrochemical cell, (b) the gas pressure of the air-diffusion electrode (ADE), and (c) the presence of mesh sheet mass transfer promoters between the electrodes. Analysis of experimental results revealed a synergistic improvement of mass transfer with the ADE gas flow and the presence of mesh promoters. Engineers could exploit this synergistic effect to design electrochemical cells with significantly lower capital cost.

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Applying electro-Fenton process as an alternative to a slaughterhouse effluent treatment

Cited by 27 publications

References 35 publications

Solar photoelectro-Fenton treatment of a mixture of parabens spiked into secondary treated wastewater effluent at low input current

Solar photoelectro-Fenton treatment of a mixture of parabens spiked into secondary treated wastewater effluent at low input current

Modeling the Fenton Depuration of the Effluent from a Slaughterhouse based on Design of Experiments

Mass transfer and residence time distribution in an electrochemical cell with an air-diffusion electrode: Effect of air pressure and mesh promoters

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