Improved 4-chlorophenol dechlorination at biocathode in bioelectrochemical system using optimized modular cathode design with composite stainless steel and carbon-based materials

Kong, Fantao; Wang, Aijie; Ren, Hongyan

doi:10.1016/j.biortech.2014.05.049

Cited by 30 publications

(3 citation statements)

References 35 publications

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“…The reduction reactions at the cathode in a BES can be exploited to reduce a large number of oxidized compounds such as metals (Tandukar et al, 2009;Xafenias et al, 2013) or halogenated compounds (Aulenta et al, 2007a;Kong et al, 2014). Several studies have reported the stimulation of microbial dechlorination by using a cathode as a direct electron donor or by in-situ H 2 production (Table 3).…”

Section: Hydrogen Generation and Cathodic Reductionmentioning

confidence: 99%

Electrobioremediation of oil spills

et al. 2017

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Annually, thousands of oil spills occur across the globe. As a result, petroleum substances and petrochemical compounds are widespread contaminants causing concern due to their toxicity and recalcitrance. Many remediation strategies have been developed using both physicochemical and biological approaches. Biological strategies are most benign, aiming to enhance microbial metabolic activities by supplying limiting inorganic nutrients, electron acceptors or donors, thus stimulating oxidation or reduction of contaminants. A key issue is controlling the supply of electron donors/acceptors. Bioelectrochemical systems (BES) have emerged, in which an electrical current serves as either electron donor or acceptor for oil spill bioremediation. BES are highly controllable and can possibly also serve as biosensors for real time monitoring of the degradation process. Despite being promising, multiple aspects need to be considered to make BES suitable for field applications including system design, electrode materials, operational parameters, mode of action and radius of influence. The microbiological processes, involved in bioelectrochemical contaminant degradation, are currently not fully understood, particularly in relation to electron transfer mechanisms. Especially in sulfate rich environments, the sulfur cycle appears pivotal during hydrocarbon oxidation. This review provides a comprehensive analysis of the research on bioelectrochemical remediation of oil spills and of the key parameters involved in the process.

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Section: Hydrogen Generation and Cathodic Reductionmentioning

confidence: 99%

Electrobioremediation of oil spills

et al. 2017

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“…This not only ensured sufficient biomass within the electrolysis cell, but also provided an adequate hydraulic retention time and stability for the reactor to record electrochemical measurements. The carbon based electrode materials were cold rolled over stainless steel mesh in order to reduce electron transfer losses and subsequently the internal resistance of BES, as also reported by Kong et al 15 Electrochemical methods can be effectively applied for in vivo determination of electron transfer processes and characterization of electroactive biolms, especially when these are not intrusive. 16 Formation of electrochemically active biolms on the electrode surfaces was reckoned by a systematic increase in current density during potentiostatic polarization at À0.85 V. Aer reaching a steady state in current (established as <AE10 mA uctuation limit in a period of 2 h), potentiostatic EIS was applied to exhibit the electron transfer characteristics of the biocathode; the effect of the variations in the operational factors in the respective EIS parameters is described in the subsequent sections.…”

Section: Resultsmentioning

confidence: 99%

Optimization of electrochemical parameters for sulfate-reducing bacteria (SRB) based biocathode

et al. 2015

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This study focuses on the effect of operational and physiochemical factors on a stable sulfate reducing bacteria biocathode and their effect on the electrochemical response thereof. Two carbon-based electrode materials i.e. VITO CORE™ and Paxitech® electrodes were evaluated. The electrochemical performance was assessed by changing both organic and inorganic components of the synthetic feed, which included carbon substrates (acetic and butyric acid), ionic strength (concentration of sodium chloride) and weak electrolytes acting as buffering agents (potassium dihydrogen phosphate and ammonium chloride). The concentration of sodium chloride (0.34 M) and acetate (0.1 M) plays a crucial role in determining the performance as well as the bioelectrochemical mechanism of the sulfate reducing bacteria (SRB) biocathode. Butyrate did not significantly influence the performance of the biocathode but showed a synergistic effect when given along with acetate. The developed biocathode was also successfully tested for dark fermentation based effluent treatment application. Concentrations higher than 10% of effluent were found to be detrimental to the electrochemical performance of the biocathode. This study essentially highlights the significance of optimization studies on bioelectrochemical system (BES) at lab scale before its potential upscaling for industrial wastewater processing.

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“…Mu 14 et al reported that the decolorization efficiency of azo dye, AO 7 , was increased from 70.9% to 98.7% by controlling the cathodic electrode potential in the range of À350 to À550 mV vs. a standard hydrogen electrode (SHE). Kong 22 et al reported that 4-chlorophenol dechlorination could be improved with composite materials rather than carbon-based materials. Sun 23 et al reported that a BER supplied with glucose had higher removal efficiency of Alizarin Yellow R than a BER supplied with acetate.…”

Section: Introductionmentioning

confidence: 99%