Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Moura, Dayanne Chianca de; Brito, Chrystiane do Nascimento; Quiróz, Marco A.; Pergher, Sibele B. C.; Martínez‐Huitle, Carlos A.

doi:10.1016/j.jwpe.2014.11.005

Cited by 20 publications

(7 citation statements)

References 29 publications

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“…They further observed an increase in COD removal by doubling the applied current from 25.2% to 30.5% at Pt anode and from 1.0% to 4.5% on BDD anode. This study observed the same as Zhou et al [30] for 10 mA cm −2 but this behavior changes for 43 and 86 mA cm −2 where the observations are similar to the ones from de Moura et al [31]. A possible explanation for this change in behavior might be the increasing current efficiency (CE) with decreasing applied current on BDD (Fig.…”

Section: Removal Of Codsupporting

confidence: 87%

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

et al. 2020

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This study investigated the applicability of electrochemical oxidation for landfill leachate treatment in climate areas, where cold temperatures prevail (like Northern Norway). Experiments were completed with pre-treated (coagulation/flocculation and separation) landfill leachate at 6 and 20 °C in order to assess the temperature influence on the degradation of the organic pollutant Bisphenol A and the fate of the ordinary wastewater parameters COD and nitrate. Furthermore, two different anode materials (Ti/Pt and Nb/BDD) and three different current densities (10, 43 and 86 mA cm−2) were compared. Additionally, the formation of the two groups of disinfection by-products, trihalomethanes and perchlorate, was monitored. A 99% removal of Bisphenol A was confirmed at 6 °C on both tested anode materials, but a current density of at least 43 mA cm−2 must be applied. Removal rates were on average 38% slower at 6 °C than at 20 °C. For comparison, Bisphenol A removal in clean electrolyte disclosed faster degradation rates (between 50 and 68%) due to absent landfill leachate matrix effects. The energy consumption for 99% Bisphenol A removal was 0.28 to 1.30 kWh m−3, and was on average 14% higher at 6 °C compared to 20 °C. Trihalomethanes were mainly formed on Pt anodes in the ppb range, while perchlorate was primarily formed at BDD anodes in the ppm range. Formation of disinfection by-products increased with increased applied current and temperature. Electrochemical oxidation was found to be a suitable treatment process for landfill leachate in cold climate areas by successfully meeting treatment goals. Graphic abstract

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Section: Removal Of Codsupporting

confidence: 87%

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

et al. 2020

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“…Another advantage looked for with the addition of salts to synthetic or real effluents is the promotion of mediated electrolysis mechanisms that enhance the efficiency of the overall process. It is well-known the formation of oxidants like peroxosalts, ozone and hydrogen peroxide on the surface of the diamond electrodes during electrolysis [25,26] and, currently, combination of CDEO with ultrasound or UV light irradiation is a topic of the major interest, because these technologies can help to transform these oxidants into very powerful radicals, which enhance hugely the mineralization of the pollutants contained in the bulk [5,27].…”

Section: Introductionmentioning

confidence: 99%

Is it really important the addition of salts for the electrolysis of soil washing effluents?

Cotillas

Cañizares

Muñoz

et al. 2017

Electrochimica Acta

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“…In the framework of EAOPs, the inactivation of pathogens can be achieved by direct oxidation which occurs when the pathogen reacts directly at the anode’s surface ( Comninellis, 1994 ; Comninellis and Nerini, 1995 ; Panizza, 2010 ) or by quasi-direct oxidation by physi- or chemi-sorbed • OH radicals in the anode’s surface vicinity ( Comninellis et al., 2008 ; Groenen-Serrano, 2018 ; Groenen-Serrano et al., 2013 ; Marselli et al., 2003 ). Furthermore, indirect oxidation can also take place by means of the electrochemical generation of a mediator such as O 3 , H 2 O 2 , active chlorine or active bromine, among others, which in turn can disinfect aqueous effluents in the bulk solution ( de Moura et al., 2015 ; García-Espinoza et al., 2018 ; Kanakaraju et al., 2018 ; Martinez-Huitle and Ferro, 2007 ; Martínez-Huitle and Panizza, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Photo-assisted electrochemical advanced oxidation processes for the disinfection of aqueous solutions: A review

et al. 2021

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Disinfection is usually the final step in water treatment and its effectiveness is of paramount importance in ensuring public health. Chlorination, ultraviolet (UV) irradiation and ozone (O 3 ) are currently the most common methods for water disinfection; however, the generation of toxic by-products and the non-remnant effect of UV and O 3 still constitute major drawbacks. Photo-assisted electrochemical advanced oxidation processes (EAOPs) on the other hand, appear as a potentially effective option for water disinfection. In these processes, the synergism between electrochemically produced active species and photo-generated radicals, improve their performance when compared with the corresponding separate processes and with other physical or chemical approaches. In photo-assisted EAOPs the inactivation of pathogens takes place by means of mechanisms that occur at different distances from the anode, that is: (i) directly at the electrode’s surface (direct oxidation), (ii) at the anode’s vicinity by means of electrochemically generated hydroxyl radical species (quasi-direct), (iii) or at the bulk solution (away from the electrode surface) by photo-electrogenerated active species (indirect oxidation). This review addresses state of the art reports concerning the inactivation of pathogens in water by means of photo-assisted EAOPs such as photo-electrocatalytic process, photo-assisted electrochemical oxidation, photo-electrocoagulation and cathodic processes. By focusing on the oxidation mechanism, it was found that while quasi-direct oxidation is the preponderant inactivation mechanism, the photo-electrocatalytic process using semiconductor materials is the most studied method as revealed by numerous reports in the literature. Advantages, disadvantages, trends and perspectives for water disinfection in photo-assisted EAOPs are also analyzed in this work.

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Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Cited by 20 publications

References 29 publications

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

Is it really important the addition of salts for the electrolysis of soil washing effluents?

Photo-assisted electrochemical advanced oxidation processes for the disinfection of aqueous solutions: A review

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