Electrochemical regeneration of a graphite adsorbent loaded with Acid Violet 17 in a spouted bed reactor

Liu, Dun; Roberts, Edward P.L.; Martin, Alastair; Holmes, Stuart M.; Brown, N. W.; Campen, Andrew K.; Heras, Natalia de las

doi:10.1016/j.cej.2016.06.070

Cited by 24 publications

(15 citation statements)

References 26 publications

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“…It has been widely reported that pollutants removal improves with increasing the current density (Lin and Peng 1996). Using higher current densities may reduce the treatment time to remove the COD and TOC from the wastewater, however, it will induce an increase of the cell potential (V CELL ) which results in increased energy consumption and decreased current efficiency (Liu et al 2016, Marcionilio et al 2016, Martinez-Huitle et al 2015, Yasri et al 2015. Anglada et al (2010) shows that in an electrochemical system for landfill leachate treatment by BDD anodic oxidation, an increase of the current density from 300 to 600 A m -2…”

Section: Energy Consumptionmentioning

confidence: 99%

“…GAC can catalyze the decomposition of the electrochemically generated H 2 O 2 leading an increased generation of • OH and enhancing the performance of the 3D system (Lücking et al 1998, Zhou andLei 2006b). Oxidant species electrogenerated at the surface of GAC particles can react with the adsorbed pollutants and enable a partial regeneration of the bed material (Cañizares et al 2004, Liu et al 2016, Zhou and Lei 2006a.…”

Section: = − Equation 11mentioning

confidence: 99%

“…Despite these materials present low adsorption capacities due to their non-porous configuration, they have showed to effectively remove a wide range of pollutants from wastewater such as chlorinated compounds (Brown and Roberts 2007), atrazine (Brown et al 2004a), organic dyes (Asghar et al 2013, Brown et al 2004b, Liu et al 2016, Mohammed et al 2011, and phenolic compounds (Hussain et al 2013a, Hussain et al 2013c). …”

Section: Introductionmentioning

confidence: 99%

“…However, as the high porosity of the GAC and its low conductivity can affect the efficiency of the regeneration process (Brown et al 2004b), and the adsorption capacity of the material is limited by mass transfer when treating low concentrations of pollutants (Narbaitz and Cen 1994), some researchers have preferred the use of non-porous graphite-based adsorbents combined with electrochemical oxidation in 3D systems (Brown et al 2004a, Hussain et al 2013c, Hussain et al 2016, Liu et al 2016, Mohammed et al 2011. Despite these materials present low adsorption capacities due to their non-porous configuration, they have showed to effectively remove a wide range of pollutants from wastewater such as chlorinated compounds (Brown and Roberts 2007), atrazine (Brown et al 2004a), organic dyes (Asghar et al 2013, Brown et al 2004b, Liu et al 2016, Mohammed et al 2011, and phenolic compounds (Hussain et al 2013a, Hussain et al 2013c).…”

Section: Introductionmentioning

confidence: 99%

“…The mechanisms of electrochemical regeneration of a bed material are not fully understood. Some studies suggest that the material can be regenerated by desorption of pollutants when GAC is polarized in the electrochemical system (Ania and Béguin 2008, Narbaitz and Cen 1994, Wang and Balasubramanian 2009, while electrochemical oxidation of the adsorbed pollutants by ROS formed on the surface of the GAC by direct and indirect electrochemical oxidation (Liu et al 2016, Wang and Zhao 2010, Zhang et al 2013, and/or catalysis in the decomposition of hydrogen peroxide to hydroxyl radicals (…”

Section: Introductionmentioning

confidence: 99%

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Novel decentralized greywater treatment system based on combined adsorption and electrochemical oxidation

Garcia¹

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Electrochemical technologies for wastewater treatment present several promising characteristics to be used as decentralized water treatment systems to provide a sustainable and cost effective growing water supply complementing centralized water supply systems. However, their application and scaling up has been hindered by the high energy input required, and the mass transfer limitations.To address these limitations, the aim of this thesis is to develop a novel decentralized water treatment system to treat greywater produced at household scale. The system, a three-dimensional (3D) electrochemical reactor, comprises a flow-through electrochemical reactor, in which the contaminated solution will pass through the borondoped diamond (BDD) anode mesh, maximizing the total contact surface of the electrode.In addition, granular activated carbon (GAC) has been added as a bed material in the reactor, which has been recognized that can enhance the performance of the conventional two-dimensional (2D) system due to its adsorption properties and by acting as a third electrode within the system.The main goals of this thesis are: (i) to elucidate how the presence of a bed material can enhance the performance of the electrochemical treatment; (ii) to develop a proof-ofconcepts on the performance of a 3D electrochemical oxidation system for the treatment of greywater; (iii) to determine the effect of current density and volume of greywater loaded, and the bed material on the performance of the 3D system; (iv) to explore the viability of the electrochemical regeneration of the bed material when operating the 3D system for the treatment of greywater.The reactor has worked under three different configurations: (i) adsorption onto activated carbon (GAC system), (ii) electrochemical oxidation on BDD anode (2D system), and (iii) combined adsorption and electrochemical oxidation (3D system) for the treatment of simulated (SGW) and real greywater (RGW). Electrochemical experiments were conducted at a fixed current density of 15 A m ) and two different volume loads (2 L and 6 L) to study the effect of these two parameters in the performance ii of the 3D system (Chapter 6). To minimise the adsorption and catalytic effect of the GAC and determine the electrochemical oxidation capacity of the bed material acting as a third electrode, it has been substituted granular graphite (GG) (Chapter 7). Electrochemical regeneration of the GAC in the 3D system has been studied over the time by loading the reactor with saturated GAC (Chapter 8). Finally, an economic analysis has been conducted for the implementation of a 3D electrochemical system at household scale (Chapter 9).The results showed that the efficiency of a conventional 2D electrochemical system can be enhanced by up to 86% for the removal of chemical oxygen demand (COD) and total organic carbon (TOC) in the 3D system. Obtained positive synergy values suggest that the combination of these two processes may trigger other electrochemical reactions in the 3D system while enabling the el...

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Section: Energy Consumptionmentioning

confidence: 99%

Section: = − Equation 11mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel decentralized greywater treatment system based on combined adsorption and electrochemical oxidation

Garcia¹

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Preliminary tests for the thermo‐chemical conversion of biomass in a spouted bed pilot plant

Bove

Moliner²,

Curti

et al. 2018

Can J Chem Eng

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The initial setting up and preliminary tests on a square‐based spouted bed gasifier at pilot scale (20 kWth) have been investigated. The novel plant is composed of: a squared‐base spouted bed unit, a feeding system to regulate the biomass mass inflow, an air pump, a clean‐up system, and an online gas chromatograph analyzer to assess the quality of the produced gas. The profile of temperatures along the reactor has been monitored with different thermocouples during experimental tests. The start‐up process has been optimized to reduce the time to achieve stationary conditions. Two different materials (wood pellets and prunings from apple trees) have been tested at different feeding rates. Wood pellets were used to validate the performance of the spouted bed reactor and afterwards, residues of prunings from apple trees were validated as a suitable potential feedstock for energy recovery purposes. In addition, a representative sample of char from wood pellet gasification has been collected and characterized. In particular, the properties of specific surface area, pore size, and pore distribution have been measured by the Brunauer‐Emmett‐Teller method. The obtained outcomes represent one of the few available results in literature using a square‐based spouted bed reactor for the gasification of biomass at pilot scale.

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Hazardous wastewater treatment by low‐cost sorbent with in situ regeneration using hybrid solar energy‐electrochemical system

Khan

Asghar

Saulat

et al. 2021

Water Environment Research

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Hazardous industrial wastes negatively impact the environment by creating issues for aquatic as well as human's life. This study investigates the treatment of hazardous industrial wastewater using cost-effective graphite adsorbent along with electrochemical regeneration integrated with renewable solar energy. The synthetic industrial effluent containing crystal violet dye was treated using an adsorbent (Nyex™ 1000) having a surface area of 1.0 m 2 g −1 . The efficiency of removing solute was found to be more than 90%. The adsorbent regeneration efficiency was achieved at 99.5% by passing a charge of 100 C g −1 at current density of 10 mA cm −2 for 1 h. Solar energy was integrated with electrochemical reactor for the regeneration of adsorbent to make the system cost-effective and self-sustainable. © 2021 Water Environment Federation • Practitioner points• Industrial hazardous wastewater treatment with a cost-effective graphite integrated adsorbent. • Development of renewable solar energy-integrated with electrochemical system for regeneration. • Regeneration efficiency of adsorbent Nyex™ 1000 was achieved around 99.5% with integrated system. • Sustainable system was introduced to incorporate with renewable energy for waste water treatment.

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Electrochemical regeneration of a graphite adsorbent loaded with Acid Violet 17 in a spouted bed reactor

Cited by 24 publications

References 26 publications

Novel decentralized greywater treatment system based on combined adsorption and electrochemical oxidation

Novel decentralized greywater treatment system based on combined adsorption and electrochemical oxidation

Preliminary tests for the thermo‐chemical conversion of biomass in a spouted bed pilot plant

Hazardous wastewater treatment by low‐cost sorbent with in situ regeneration using hybrid solar energy‐electrochemical system

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