Coupling of anodic oxidation and adsorption by granular activated carbon for chemical oxygen demand removal from 4,4′-diaminostilbene-2,2′-disulfonic acid wastewater

Wang, Lizhang; Zhao, Yuemin

doi:10.2166/wst.2010.639

Cited by 2 publications

(10 citation statements)

References 24 publications

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“…In 3D electrochemical reactors with AC filling, synergies between electrochemical oxidation, AC adsorption and also electrocatalysis on the AC due to the formation of • OH radicals have been observed (Figure 9) (Wang and Zhao 2010, Zhang et al 2013, Zhou and Lei 2006a). …”

Section: Activated Carbon As a Bed Materialsmentioning

confidence: 99%

“…Several studies have reported that polarized AC, as a bed material in these systems, can perform direct electrochemical oxidation of pollutants on its surface, and also indirect electrochemical oxidation can take place by the generation of strong oxidants (e.g., H 2 O 2 , Cl 2 , HClO) (Wang and Zhao 2010, Zhang et al 2013). However, the performance of the system when AC is in direct contact with the electrodes can vary compared with a system in which AC is separated.…”

Section: B) Direct and Indirect Electrochemical Oxidationmentioning

confidence: 99%

“…The presence of the electric field promotes the electric activation of each AC particle which can act as a bipolar material, resulting in the enhancement of the current efficiency (Wang and Zhao 2010).…”

Section: B) Direct and Indirect Electrochemical Oxidationmentioning

confidence: 99%

“…Promising efficiency of electrochemical regeneration of AC, by oxidation of the adorbed pollutants, has been demonstrated in the recent years (Narbaitz and Cen 1994, Narbaitz and Karimi-Jashni 2008, Wang and Zhao 2010, Zhang et al 2013). This process presents several advantages (Narbaitz and Cen 1994, Narbaitz and KarimiJashni 2008, Zhang 2002:…”

Section: Electrochemical Regeneration Of Activated Carbonmentioning

confidence: 99%

“…In addition, it has been reported that in a 3D electrochemical system using GAC as a bed material, electrochemical oxidation and adsorption onto GAC surface are not the only reactions implied in the efficiency of this treatment process . Synergies between electrochemical oxidation, adsorption and electrocatalysis have been demonstrated to enhance oxidation of pollutants mediated by the presence of • OH radicals (Wang and Zhao 2010, Zhang et al 2013, Zhou and Lei 2006a). …”

Section: Knowledge Gapsmentioning

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: Activated Carbon As a Bed Materialsmentioning

confidence: 99%

Section: B) Direct and Indirect Electrochemical Oxidationmentioning

confidence: 99%

Section: B) Direct and Indirect Electrochemical Oxidationmentioning

confidence: 99%

Section: Electrochemical Regeneration Of Activated Carbonmentioning

confidence: 99%

Section: Knowledge Gapsmentioning

confidence: 99%

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

Garcia¹

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Electrochemical Conversion of Micropollutants in Gray Water

Butkovskyi

Jeremiasse

Leal³

et al. 2014

Environ. Sci. Technol.

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Electrochemical conversion of micropollutants in real gray water effluent was studied for the first time. Six compounds that are frequently found in personal care and household products, namely methylparaben, propylparaben, bisphenol A, triclosan, galaxolide, and 4- methylbenzilidene camphor (4-MBC), were analyzed in the effluent of the aerobic gray water treatment system in full operation. The effluent was used for lab-scale experiments with an electrochemical cell operated in batch mode. Three different anodes and five different cathodes have been tested. Among the anodes, Ru/Ir mixed metal oxide showed the best performance. Ag and Pt cathodes worked slightly better than Ti and mixed metal oxide cathodes. The compounds that contain a phenolic ring (parabens, bisphenol A, and triclosan) were completely transformed on this anode at a specific electric charge Q = 0.03 Ah/L. The compounds, which contain a benzene ring and multiple side methyl methyl groups (galaxolide, 4-MBC) required high energy input (Q ≤ 0.6 Ah/L) for transformation. Concentrations of adsorbable organohalogens (AOX) in the gray water effluent increased significantly upon treatment for all electrode combinations tested. Oxidation of gray water on mixed metal oxide anodes could not be recommended as a post-treatment step for gray water treatment according to the results of this study. Possible solutions to overcome disadvantages revealed within this study are proposed.

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Coupling of anodic oxidation and adsorption by granular activated carbon for chemical oxygen demand removal from 4,4′-diaminostilbene-2,2′-disulfonic acid wastewater

Cited by 2 publications

References 24 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

Electrochemical Conversion of Micropollutants in Gray Water

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