Electricity production during the treatment of real electroplating wastewater containing Cr6+ using microbial fuel cell

Li, Zhongjian; Zhang, Qizhou; Lei, Lecheng

doi:10.1016/j.procbio.2008.08.005

Cited by 256 publications

(75 citation statements)

References 37 publications

(39 reference statements)

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“…Table 3 compares the maximum power densities recorded in the literature, with the ones observed in this study where lactate instead of a bacterial catalyst was used to enhance the process. At pH 6, the power density produced in this study was comparable with previous studies that were performed in the absence of a metal chelator (Wang et al 2008;Li et al 2008). However, we only used 1/5 to 1/10 the concentration used elsewhere, and this should have reduced the redox potential of the Cr(VI)/Cr(III) couple, as predicted by the Nernst equation (Eq.…”

Section: Cr(vi) Reduction At Different Ph Valuessupporting

confidence: 88%

“…2000). The physicochemical characteristics of Cr(VI) containing wastewater will very much vary from the strongly acidic chrome plating wastewater (Li et al 2008) to the alkaline chromite ore processing wastewater (Stewart et al 2007). Various treatment approaches exist but an effective remediation option involves Cr(VI) reduction to the considerably less toxic trivalent form (Cr(III)) (Brandhuber et al 2004;Palmer and Puls 1994), according to Eq.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating hexavalent chromium reduction and electricity production in microbial fuel cells with alkaline cathodes

Xafenias

Zhang

Banks

2014

Int. J. Environ. Sci. Technol.

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The work investigated the efficiency of microbial fuel cells (MFCs) for the treatment of alkaline hexavalent chromium containing wastewater. When lactate was used as the metal chelator in alkaline (pH 8) abiotic cathodes, hexavalent chromium concentration dropped from 10 mg l -1 to undetectable levels within the first 45 h of operation. Power density produced in the pH 8 abiotic cathodes was up to 21.4 mW m -2 , and in the pH 9 cathodes up to 2.4 mW m -2 ; these values were well comparable with other values found in the literature for biologically catalysed cathodes, even at lower pH values. When Shewanella oneidensis MR-1 was present in a hexavalent chromium reducing cathode at pH 8, current production contributed by 26 % to the total hexavalent chromium reduced during the 36 days of operation. On the other hand, when hexavalent chromium (10 mg l -1 ) was controllably added in the anode where S. oneidensis MR-1 was present, up to 73 % of current decreased immediately after every hexavalent chromium addition; this toxic effect remained even after hexavalent chromium was depleted in the anode and strongly indicates that the presence of hexavalent chromium in the anodes of MFCs must be avoided. Overall, our results indicate that alkaline hexavalent chromium wastewater can be effectively remediated in the cathodes of MFCs, provided that a metal chelator is present in the cathodes and that hexavalent chromium is not present in the anodes.

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Section: Cr(vi) Reduction At Different Ph Valuessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Evaluating hexavalent chromium reduction and electricity production in microbial fuel cells with alkaline cathodes

Xafenias

Zhang

Banks

2014

Int. J. Environ. Sci. Technol.

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“…shown promising results for the reduction of Cr(VI) since they couple reduced sludge generation with the production of renewable energy [3][4]. In MFCs, electrons are released from reductive organic matters in the anode in the presence of exoelectrogens.…”

Section: Introductionmentioning

confidence: 99%

Impact of Fe(III) as an effective electron-shuttle mediator for enhanced Cr(VI) reduction in microbial fuel cells: Reduction of diffusional resistances and cathode overpotentials

Wang

Huang

Pan

et al. 2017

Journal of Hazardous Materials

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“…Removal options include ion-exchange, adsorption and electrodialysis 3 ; however in many of these applications chromium keeps its toxic hexavalent state. Reduction of Cr(VI) to the considerably 3 less toxic trivalent form Cr(III) and its subsequent precipitation at neutral pH could be considered a more effective remediation strategy 4 .A possible method for Cr(VI) reduction using a microbial fuel cell (MFC) has recently been proposed, where Cr(VI) was used as an oxidant in the cathode to generate an electrical energy output 5,6 . At low pH values where H + is abundant, cathodic Cr(VI) reduction has been demonstrated at relatively fast rates and without the use of a catalyst 5,6 .…”

mentioning

confidence: 99%

Enhanced Performance of Hexavalent Chromium Reducing Cathodes in the Presence ofShewanella oneidensisMR-1 and Lactate

Xafenias

Zhang

Banks

2013

Environ. Sci. Technol.

136

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Biocathodes for the reduction of the highly toxic hexavalent chromium (Cr(VI)) were investigated using Shewanella oneidensis MR-1 (MR-1) as a bio-catalyst and performance was assessed in terms of current production and Cr(VI) reduction. Potentiostatically controlled experiments (-500 mV vs. Ag/AgCl) showed that a mediatorless MR-1 biocathode started up 2 under aerated conditions in the presence of lactate, received 5.5 and 1.7 times more electrons for Cr(VI) reduction over a 4-hour operating period than controls without lactate and with lactate but without MR-1, respectively. Cr(VI) reduction was also enhanced, with a decrease in concentration over the 4-h operating period of 9 mg/L Cr(VI), compared to only 1 and 3 mg/L respectively in the controls. Riboflavin, an electron shuttle mediator naturally produced by MR-1, was also found to have a positive impact in potentiostatically controlled cathodes. Additionally, a microbial fuel cell (MFC) with MR-1 and lactate present in both anode and cathode produced a maximum current density of 32.5 mA/m 2 (1,000 Ω external load) after receiving a 10 mg/L Cr(VI) addition in the cathode, and cathodic efficiency increased steadily over an 8-day operation period with successive Cr(VI) additions. In conclusion, effective and continuous Cr(VI) reduction with associated current production were achieved when MR-1 and lactate were both present in the biocathodes. INTRODUCTIONHexavalent chromium (Cr(VI)) is a highly toxic, mutagenic and carcinogenic substance that is present in the effluent streams of a wide range of industrial processes, including electroplating, leather tanning and wood preserving 1 . It is highly soluble and, because of its long history of use and often its disposal after inappropriate or no treatment, it has become one of the most abundant inorganic contaminants in groundwater. Ideally Cr(VI) should be removed from groundwater in the natural environment, and because of the inherent dangers to health the stringent guideline limit of 50 μg/L has been issued for total chromium concentration in drinking water 1,2 . Removal options include ion-exchange, adsorption and electrodialysis 3 ; however in many of these applications chromium keeps its toxic hexavalent state. Reduction of Cr(VI) to the considerably 3 less toxic trivalent form Cr(III) and its subsequent precipitation at neutral pH could be considered a more effective remediation strategy 4 .A possible method for Cr(VI) reduction using a microbial fuel cell (MFC) has recently been proposed, where Cr(VI) was used as an oxidant in the cathode to generate an electrical energy output 5,6 . At low pH values where H + is abundant, cathodic Cr(VI) reduction has been demonstrated at relatively fast rates and without the use of a catalyst 5,6 . In the neutral pH region, however, the reaction kinetics are slower due to low H + availability:CrO 4 2-+ 8H + + 3e -= Cr 3+ + 4H 2 O (1) At neutral pH, Cr(VI) reduction takes place under lower cathode potentials and is also severely inhibited by Cr(III) oxyhydroxide monolayers w...

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Electricity production during the treatment of real electroplating wastewater containing Cr6+ using microbial fuel cell

Cited by 256 publications

References 37 publications

Evaluating hexavalent chromium reduction and electricity production in microbial fuel cells with alkaline cathodes

Evaluating hexavalent chromium reduction and electricity production in microbial fuel cells with alkaline cathodes

Impact of Fe(III) as an effective electron-shuttle mediator for enhanced Cr(VI) reduction in microbial fuel cells: Reduction of diffusional resistances and cathode overpotentials

Enhanced Performance of Hexavalent Chromium Reducing Cathodes in the Presence ofShewanella oneidensisMR-1 and Lactate

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