Bioelectrochemical treatment of acid mine drainage dominated with iron

Lefebvre, Olivier; Neculita, Carmen Mihaela; Yue, Xiaodi; Ng, Henry

doi:10.1016/j.jhazmat.2012.09.062

Cited by 72 publications

(18 citation statements)

References 29 publications

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“…Fe 3þ can be reduced to Fe 2þ at the cathode of MFCs, followed by Fe 2þ re-oxidation and precipitation as oxy(hydroxi)des [149]. The reduction of metal ions on cathodes is useful for their removal and recovery.…”

Section: Ironmentioning

confidence: 99%

Behavior of metal ions in bioelectrochemical systems: A review

Dingming

et al. 2015

Journal of Power Sources

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Section: Ironmentioning

confidence: 99%

Behavior of metal ions in bioelectrochemical systems: A review

Dingming

et al. 2015

Journal of Power Sources

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“…After ~50 h current cycles ( Figure A1), pH rose from 3.7 ± 0.1 (influent culture medium) to 7.9 ± 0.1 (reactor effluent). It was previously observed that pH of synthetic AMD water dominated with iron rose from 2.5 to 7.9 in the abiotic cathodic chamber of a MFC, when a charge of 662 coulombs was transferred between the electrodes [22]. Similarly, a batch-operated SC-MFC, using initial moderately-acidic conditions (pH = 5.0) evidenced a pH increase of ~1 unit [25].…”

Section: Ph Neutralization and Continuos-flow Operation Modementioning

confidence: 91%

“…Even though the efforts that have been conducted to apply MFC technology to AMD remediation, very few studies have focused in pH neutralization of AMD waters. To our knowledge, only Lefebvre et al [22] has shown, in a double-chamber MFC that the pH of a synthetic AMD solution may rise from 2.5 to values higher than 7.…”

Section: Introductionmentioning

confidence: 95%

Acid Water Neutralization Using Microbial Fuel Cells: An Alternative for Acid Mine Drainage Treatment

Leiva

Leiva-Aravena

Vargas

2016

Water

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Acid mine drainage (AMD) is a complex environmental problem, which has adverse effects on surface and ground waters due to low pH, high toxic metals, and dissolved salts. New bioremediation approach based on microbial fuel cells (MFC) can be a novel and sustainable alternative for AMD treatment. We studied the potential of MFC for acidic synthetic water treatment through pH neutralization in batch-mode and continuous-flow operation. We observed a marked pH increase, from~3.7 to~7.9 under batch conditions and to~5.8 under continuous-flow operation. Likewise, batch reactors (non-MFC) inoculated with different MFC-enriched biofilms showed a very similar pH increase, suggesting that the neutralization observed for batch operation was due to a synergistic influence of these communities. These preliminary results support the idea of using MFC technologies for AMD remediation, which could help to reduce costs associated with conventional technologies. Advances in this configuration could even be extrapolated to the recovery of heavy metals by precipitation or adsorption processes due to the acid neutralization.

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“…For example, the ferric/ferrous iron couple was demonstrated to be an efficient mediator of oxygen reduction at the cathode . Another study used high concentrations of iron chloride to produce synthetic acid mine drainage with high iron content and low pH that was successfully utilised as catholyte . In terms of the anode half‐cell reaction, Wu et al .…”

Section: Introductionmentioning

confidence: 99%

Analysis of microbial fuel cell operation in acidic conditions using the flocculating agent ferric chloride

Winfield

Greenman

Dennis

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND Ferric chloride (FeCl3) is widely used as a flocculating agent during wastewater treatment but can detrimentally lower pH and increase iron concentration. Microbial fuel cells (MFCs) are a promising technology for treating waste while concomitantly producing electricity and so were tested under the extreme conditions imposed by the addition of FeCl3. MFCs were fed eight concentrations of FeCl3 over two 8‐week periods and the effects on power, pH, conductivity, metal content and COD were examined. RESULTS MFCs generated highest power (3.58 W m‐3) at 1.6 mmol L‐1 FeCl3 (pH 3.46), however cells reversed when fed 2 mmol L‐1 (pH 3.29). During the second run, power almost doubled and MFCs were more resilient at higher loadings up to 2.8 mmol L‐1 (pH 3.02). Conductivity and pH increased following treatment while soluble phosphorus, sulphur and iron levels decreased significantly in all feedstock up to 1.6 mmol L‐1 FeCl3. COD reduction was observed but efficiency may have been affected by the presence of alternative electron donors such as hydrogen sulphide. CONCLUSION These findings demonstrate the robustness and versatility of MFCs in hostile conditions. They also confirm that MFCs can complement current wastewater treatment processes, even downstream from FeCl3 dosing where conditions might be deemed unsuitable for operation. © 2014 Society of Chemical Industry

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Bioelectrochemical treatment of acid mine drainage dominated with iron

Cited by 72 publications

References 29 publications

Behavior of metal ions in bioelectrochemical systems: A review

Behavior of metal ions in bioelectrochemical systems: A review

Acid Water Neutralization Using Microbial Fuel Cells: An Alternative for Acid Mine Drainage Treatment

Analysis of microbial fuel cell operation in acidic conditions using the flocculating agent ferric chloride

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