Electrochemical regeneration of spent activated carbon from drinking water treatment plant at different scale reactors

Ferrández-Gómez, Borja; Ruiz-Rosas, Ramiro; Beaumont, Samuel; Cazorla‐Amorós, Diego; Morallón, Emilia

doi:10.1016/j.chemosphere.2020.128399

Cited by 30 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the PR is off, the freshly produced H 2 O 2 is effectively decomposed into •OH due to the restoration of surface OGs on the GAC after the PR is applied, since anodic current increases the amount of OGs [29]. The increase in active surface sites, mainly through OGs, will efficiently increase the •OH generation through H 2 O 2 decomposition by eliminating the competing reactions (see Equations ( 9)-( 11)) [23,[66][67][68].…”

Section: Influence Of Reaction Timementioning

confidence: 99%

“…To overcome these limitations, a significant number of modifications have been conducted to improve the surface chemistry of ACs towards enhancing their electrocatalytic activity [29][30][31][32]. Given that the generation of H 2 O 2 and •OH occurs via interfacial electron transfer at the surface of the electrode, engineering and manipulating the surface chemistry of the AC electrodes are key routes to effectively enhance the electrochemical processes.…”

Section: Introductionmentioning

confidence: 99%

“…One of the issues of utilizing GAC is its poor absorption and selectivity when it comes to certain contaminants [49]. To overcome this limitation, the recent trend is focused on different treatment methods (e.g., electrochemical oxidation) that involve physicochemical modifications of the GAC properties using strong acids as electrochemical oxidizing agents [29,50]. In these few studies, strong acids were mainly used as electrochemical oxidizing agents during the surface modification of GAC, which makes these processes difficult to control, costly, and hard to implement on large scales.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Engineering Electrode Polarity for Enhancing In Situ Generation of Hydroxyl Radicals Using Granular Activated Carbon

Sarrouf,

Taqieddin,

Ehsan

et al. 2024

Catalysts

View full text Add to dashboard Cite

Recently, granular activated carbon (GAC) has shown its effectiveness as a cathode material for in situ ROS generation. Here, we present an electrochemically modified GAC cathode using electrode polarity reversal (PR) approach for enhanced H2O2 decomposition via 2-electron oxygen reduction reaction (2e-ORR). The successful GAC modification using PR necessitates tuning of the operational parameters such as frequency, current, and time intervals between the PR cycles. This modification enhances the GAC hydrophilicity by increasing the density of surface oxygen functionalities. After optimization of the electrode polarity, using the 20 (No PR)-2 (PR) interval and 140 mA current intensity, the •OH concentration reaches 38.9 μM compared to the control (No PR) (28.14 μM). Subsequently, we evaluated the enhanced •OH generation for the removal of glyphosate, a persistent pesticide used as a model contaminant. The modified GAC using PR removed 67.6% of glyphosate compared to 40.6% by the unmodified GAC without PR, respectively. The findings from this study will advance the utilization of GAC for in situ ROS synthesis, which will have direct implications on increasing the effectiveness of electrochemical water treatment systems.

show abstract

Section: Influence Of Reaction Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Engineering Electrode Polarity for Enhancing In Situ Generation of Hydroxyl Radicals Using Granular Activated Carbon

Sarrouf,

Taqieddin,

Ehsan

et al. 2024

Catalysts

View full text Add to dashboard Cite

show abstract

“…Much attention has been paid to alternative regeneration techniques in recent years. These techniques include microbial regeneration 8 , wet oxidation processes 9 , chemical regeneration 10 – 12 , solvent regeneration 13 , microwave-assisted regeneration 14 , electrochemical regeneration 6 , 15 , 16 , solar regeneration 17 , and thermal regeneration 18 . Clearly, the above reports have strongly demonstrated general and very effective strategies to improve the regenerative performance.…”

Section: Introductionmentioning

confidence: 99%

Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Gao

Wang

Huang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

In this study, the impregnation synthesis of NiO/sepiolite and its application for dye removal during wastewater treatment is introduced. The NiO/sepiolite materials act as an adsorbent/catalyst. It comprises a unique combination of adsorption and high-temperature gas flow regeneration (the NiO/sepiolite acts as a catalyst at this stage, using regeneration rate as evaluation index of catalytic activity of NiO/sepiolite) in a single unit, in which the NiO/sepiolite was regenerated and reused for the next round adsorption of dye. An aqueous solution of methylene blue was used to evaluate the adsorption and regeneration performance of the adsorbent/catalyst. The regeneration rate reached 74% when the reaction time and temperature were 7 min and 350 °C, respectively. The effects of the regeneration temperature and volume fraction of O2 on the regeneration rate were investigated. And the regeneration reaction kinetics was provided. The combination of adsorptive and catalytic properties in the NiO/sepiolite composites received interesting results for removing refractory biodegradable organic pollutants. This work provides new insights for the removal of dye from wastewater using Ni catalysts supported on natural low-cost clay.

show abstract

“…In general, a reactor of an electrochemical treatment plant consists of an electrolytic cell with an anode on one side and a cathode on the other side [15]. When the system is connected to a power source, the oxidation process occurs in the anode making it electrochemically corroded, while passivation occurs in the cathode.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Electrolysis within an Integrated System for a Poultry Slaughterhouse Wastewater Treatment

et al. 2021

View full text Add to dashboard Cite

Treatment of poultry slaughterhouse wastewater before disposal or reuse is an essential part of human health and environmental protection in general. This study aimed to investigate the influence of the pre-treatment system based on electrolysis technology within an integrated lab-scale treatment plant in the removal of contaminants from poultry slaughterhouse wastewater. Several treatment units (averaging tank, feather catcher, fat catcher, and coarse mechanical filter) were connected in series before the electrolysis chamber. While in general, the entire integrated system also included some other units such as ultra-filtration, reverse osmosis, and the ultraviolet lamp connected in series. From the analysis results, it was observed that the pre-treatment phase with electrolysis had a significant influence on the general performance of the treatment plant. The pre-treatment contributed to about 33.5% to 100% in the general contaminants’ removal efficiency. The highest contribution was observed from the total chlorine (100%), nitrate (98.2%), as well as BOD (95.3%). The lowest contribution was observed from the nitrite removal, with 33.5%. This study revealed further that the integration of electrolysis technology in a wastewater treatment system has a significant potential for developing an effective wastewater treatment plant.

show abstract

Electrochemical regeneration of spent activated carbon from drinking water treatment plant at different scale reactors

Cited by 30 publications

References 37 publications

Engineering Electrode Polarity for Enhancing In Situ Generation of Hydroxyl Radicals Using Granular Activated Carbon

Engineering Electrode Polarity for Enhancing In Situ Generation of Hydroxyl Radicals Using Granular Activated Carbon

Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Contribution of Electrolysis within an Integrated System for a Poultry Slaughterhouse Wastewater Treatment

Contact Info

Product

Resources

About