Electrochemical technologies for wastewater treatment and resource reclamation

Feng, Yi; Yang, Lisha; Liu, Junfeng; Logan, Bruce E.

doi:10.1039/c5ew00289c

Cited by 238 publications

(166 citation statements)

References 398 publications

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“…The use of reticulated vitreous carbon as working electrode has shown some advantages such as good conductivity, high surface area, chemical stability and low cost (5). Cooper and silver electrodes present good activity for the electroreduction of nitrate (4), therefore the deposition of these metals onto carbon electrodes to enhance the catalytic activity have been tested with good results (6,7,8).…”

Section: Introductionmentioning

confidence: 99%

“…Many processes have been used for nitrate removal and the electrochemical treatment is one of the most efficient due to its advantages regarding low cost effectiveness and ability to treat highly concentrated nitrate effluents (3). The electrode material is an important variable for the nitrate electroreduction process and the development of new electrodes to improve their catalytic activity is a challenge (4). The use of reticulated vitreous carbon as working electrode has shown some advantages such as good conductivity, high surface area, chemical stability and low cost (5).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silver Particles Electrodeposited on Reticulated Vitreous Carbon for Nitrate Reduction

et al. 2017

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The electrocatalytic activity of silver particles electrodeposited on reticulated vitreous carbon (RVC) was evaluated for nitrate reduction. Different morphologies of silver deposits were obtained by varying the deposition potential, AgNO 3 concentration solution, and deposition time. Silver deposit was not uniform due to the three-dimensional shaped electrode. The more elevated regions on the surface present a more intense deposition. The lowest silver ion concentration of 5 mM associated to the lowest deposition time of 10 s provided the most uniform Ag deposition. The electrocatalytic activities for nitrate reduction were improved for electrodes with Ag deposited at potential of -0.3 V, time of 60 s and silver ion concentrations of 10 and 20 mM, probably due to the connection between Ag dendrites and Ag nanoparticles that increased the electrode surface area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Silver Particles Electrodeposited on Reticulated Vitreous Carbon for Nitrate Reduction

et al. 2017

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“…Electrocoagulation is an electrochemical technology that is currently gaining scientific and industrial interest due to the wide range of applications in which this process has been proven efficient. It has been successfully applied in the treatment of drinking water, different types of industrial wastewater, urban wastewater and reclaimed wastewater …”

Section: Introductionmentioning

confidence: 99%

“…Electrocoagulation is reported to exhibit clear advantages versus conventional chemical coagulation, specifically lower chemical dosing requirements, limited increase (or even decrease) in the ionic conductivity, better pH control and lower operational costs . In addition, this process is known to activate other additional treatment mechanisms such as electro‐flocculation, electro‐flotation or even electrochemical disinfection …”

Section: Introductionmentioning

confidence: 99%

Development of a novel electrochemical coagulant dosing unit for water treatment

Llanos

Isidro

Sáez

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND The design of new approaches that help to decrease both the environmental impact of industrial activities and the cost of existing water treatment technologies is becoming a key aspect of research. In the present work, an efficient and easy‐to‐use electrochemical device designed to dose iron coagulants is presented. RESULTS The proposed device (the Electrochemically‐assisted Coagulant – production & dosing Unit, ECU) exhibits an efficient performance in the dosing of coagulants regardless of the ionic conductivity of the water matrixes tested (within the range 100 to 1000 µS cm−1), covering a wide range of potential real surface waters. The behaviour of the ECU device was compared to that of a conventional chemical dosing of iron, and showed better pH (pH ≈ 8 for ECU but < 4 for equivalent chemical dosing) and conductivity (decrease for ECU but increase up to 60% for equivalent chemical dosing) control. Moreover, the ECU unit produced a noticeable amount of Fe2+ ions, due to the limited access of atmospheric oxygen inside the device. CONLUSION The device developed overcomes traditional chemical iron dosing and could be potentially applied in uses different from electrocoagulation, as it is the case of Fenton‐related technologies. © 2018 Society of Chemical Industry

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“…These include water recovery of sufficient quality for discharge or onsite reuse, as well as secondary minerals and/or metals of commercial interest. 4,5 Recently, our group has developed a hybrid autotrophic-microbial/ electrochemical AMD treatment system that requires no chemical dosing and that is able to concomitantly produce a pH-neutral water effluent, recover elemental sulfur (S 0 ), produce a metal-sludge with superior settleability and that includes rare Earth elements and yttrium (REY) with numerous current and emerging industrial applications. 4 Microbial electrochemical AMD remediation is nevertheless a relatively new proposed alternative to other conventional management/remediation methods 6 -such as neutralisation and precipitation by chemical dosing (of, for example, lime)…”

Section: Introductionmentioning

confidence: 99%

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

et al. 2018

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Microbial electrochemical processes have potential to remediate acid mine drainage (AMD) wastewaters which are highly acidic and rich in sulfate and heavy metals, without the need for extensive chemical dosing. In this manuscript, a novel hybrid microbial/electrochemical remediation process which uses a 3-reactor system -a precipitation vessel, an electrochemical reactor and a microbial electrochemical reactor with a sulfate-reducing biocathode -was modelled. To evaluate the long-term operability of this system, a dynamic model for the fluxes of 140 different ionic species was developed and calibrated using laboratory-scale experimental data. The model identified that when the reactors are operating in the desired state, the coulombic efficiency of sulfate removal from AMD is high (91%). Modelling also identified that a periodic electrolyte purge is required to prevent the build-up of Cl À ions in the microbial electrochemical reactor. The model furthermore studied the fate of sulfate and carbon in the system.For sulfate, it was found that only 29% can be converted into elemental sulfur, with the rest complexating with metals in the precipitation vessel. Finally, the model shows that the flux of inorganic carbon under the current operational strategy is insufficient to maintain the autotrophic sulfate-reducing biomass. The modelling approach demonstrates that a change in system operational strategies plus close monitoring of overlooked ionic species (such as Cl À and HCO 3 À ) are key towards the scaling-up of this technology.

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Electrochemical technologies for wastewater treatment and resource reclamation

Abstract: Electrochemical processes that can be used for wastewater treatment and resource reclamation are reviewed with suggestions for future research directions.

Cited by 238 publications

References 398 publications

Effect of Silver Particles Electrodeposited on Reticulated Vitreous Carbon for Nitrate Reduction

Effect of Silver Particles Electrodeposited on Reticulated Vitreous Carbon for Nitrate Reduction

Development of a novel electrochemical coagulant dosing unit for water treatment

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

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