Navigating the electrodisinfection frontier: A roadmap towards resilient implementation

Atrashkevich, Aksana; Garcia-Segura, Sergi

doi:10.1016/j.coelec.2023.101437

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…To assess the potential for employing a dual-cathode system for efficient treatment of uncharged trace organic contaminants, we coupled an air-diffusion electrode and a flow-through stainless-steel electrode to produce · OH from ambient air. Three reactor configurations were assessed because the interactions between electrodes could affect the H 2 O 2 production and activation processes and may offer additional benefits, such as disinfection by the anodically produced free chlorine, reduced formation of disinfection products, and control of residual H 2 O 2 . The system was optimized to ensure a proper balance between H 2 O 2 production and activation under circumneutral pH conditions prior to assessing its ability to transform neutral trace organic contaminants in authentic surface waters.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Hydrogen Peroxide Generation and Activation Using a Dual-Cathode Flow-Through Treatment System: Enhanced Selectivity for Contaminant Removal by Electrostatic Repulsion

Duan,

Sedlak

2024

Environ. Sci. Technol.

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To oxidize trace concentrations of organic contaminants under conditions relevant to surface-and groundwater, airdiffusion cathodes were coupled to stainless-steel cathodes that convert atmospheric O 2 into hydrogen peroxide (H 2 O 2 ), which then was activated to produce hydroxyl radicals ( • OH). By separating H 2 O 2 generation from its activation and employing a flow-through electrode consisting of stainless-steel fibers, the two processes could be operated efficiently in a manner that overcame mass-transfer limitations for O 2 , H 2 O 2 , and trace organic contaminants. The flexibility resulting from separate control of the two processes made it possible to avoid both the accumulation of excess H 2 O 2 and the energy losses that take place after H 2 O 2 has been depleted. The decrease in treatment efficacy occurring in the presence of natural organic matter was substantially lower than that typically observed in homogeneous advanced oxidation processes. Experiments conducted with ionized and neutral compounds indicated that electrostatic repulsion prevented negatively charged • OH scavengers from interfering with the oxidation of neutral contaminants. Energy consumption by the dual-cathode system was lower than values reported for other technologies intended for small-scale drinking water treatment systems. The coordinated operation of these two cathodes has the potential to provide a practical, inexpensive way for point-of-use drinking water treatment.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Hydrogen Peroxide Generation and Activation Using a Dual-Cathode Flow-Through Treatment System: Enhanced Selectivity for Contaminant Removal by Electrostatic Repulsion

Duan,

Sedlak

2024

Environ. Sci. Technol.

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Tuning the Locally Enhanced Electric Field Treatment (LEEFT) between Electrophysical and Electrochemical Mechanisms for Bacteria Inactivation

Wang,

Xie

2024

Environ. Sci. Technol.

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Efficient drinking water disinfection methods are critical for public health. Locally enhanced electric field treatment (LEEFT) is an antimicrobial method that uses sharp structures, like metallic nanowires, to enhance the electric field at tips and cause bacteria inactivation. Electroporation is the originally designed mechanism of LEEFT. Although oxidation is typically undesired due to byproduct generation and electrode corrosion, it can enhance the overall disinfection efficiency. In this work, we conduct an operando investigation of LEEFT, in which we change the electrical parameters to tune the mechanisms between electrophysical electroporation and electrochemical oxidation. Pure electroporation (i.e., without detectable oxidation) could be achieved under a duty cycle of ≤0.1% and a pulse width of ≤2 μs. Applying 2 μs pulses at 7–8 kV/cm and 0.1% duty cycle results in 80–100% bacteria inactivation with pure electroporation. A higher chance of oxidation is found with a higher duty cycle and a longer pulse width, where the antimicrobial efficiency could also be enhanced. For water with a higher conductivity, a higher antimicrobial efficiency can be achieved under the same treatment conditions, and electrochemical reactions could be induced more easily. The findings shown in this work improve the fundamental understanding of LEEFT and help optimize the performance of LEEFT in real applications.

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Navigating the electrodisinfection frontier: A roadmap towards resilient implementation

Cited by 2 publications

References 41 publications

Electrochemical Hydrogen Peroxide Generation and Activation Using a Dual-Cathode Flow-Through Treatment System: Enhanced Selectivity for Contaminant Removal by Electrostatic Repulsion

Electrochemical Hydrogen Peroxide Generation and Activation Using a Dual-Cathode Flow-Through Treatment System: Enhanced Selectivity for Contaminant Removal by Electrostatic Repulsion

Tuning the Locally Enhanced Electric Field Treatment (LEEFT) between Electrophysical and Electrochemical Mechanisms for Bacteria Inactivation

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