Benzene Biodegradation under Anaerobic Conditions Coupled with Metal Oxides Reduction

Villatoro-Monzón, Wilverth R.; Morales-Ibarría, Marcia; Velázquez, Elia K.; Ramírez-Saad, Hugo; Razo-Flores, Elı́as

doi:10.1007/s11270-008-9643-x

Cited by 26 publications

(8 citation statements)

References 34 publications

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“…The microbial oxidation of aromatic hydrocarbons including biphenyl can be coupled to the reduction of Fe(III) (Lovley, D.R. et al, 1996; Villatoro-Monzón, W. et al, 2008), nitrate (Coates, J.D. et al, 2001; Rockne, K.J.…”

Section: Resultsmentioning

confidence: 99%

Electrical stimulation of microbial PCB degradation in sediment

et al. 2013

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Bioremediation of polychlorinated biphenyls (PCBs) has been precluded in part by the lack of a cost-effective method to stimulate microbial degradation in situ. A common limitation is the lack of an effective method of providing electron donors and acceptors to promote in situ PCB biodegradation. Application of an electric potential to soil/sediment could be an effective means of providing electron-donors/-acceptors to PCB dechlorinating and degrading microorganisms. In this study, electrical stimulation of microbial PCB dechlorination/ degradation was examined in sediment maintained under simulated in situ conditions. Voltage was applied to open microcosms filled with PCB-impacted (Aroclor 1242) freshwater sediment from a Superfund site (Fox River, WI). The effect of applied low voltages (1.5 to 3.0V) on the microbial transformation of PCBs was determined with: 1) spiked PCBs, and 2) indigenous weathered PCBs. The results indicate that both oxidative and reductive microbial transformation of the spiked PCBs was stimulated but oxidation was dominant and most effective with higher voltage. Chlorobenzoates were produced as oxidation metabolites of the spiked PCBs, but increasing voltage enhanced chlorobenzoate consumption, indicating that overall degradation was enhanced. In the case of weathered PCBs, the total concentration decreased 40–60% in microcosms exposed to electric current while no significant decrease of PCB concentration was observed in control reactors (0 V or sterilized). Single congener analysis of the weathered PCBs showed significant loss of di- to penta-chlorinated congeners, indicating that microbial activity was not limited to anaerobic dechlorination of only higher chlorinated congeners. Degradation was most apparent with the application of only 1.5 V where anodic O2 was not generated, indicating a mechanism of degradation independent of electrolytic O2. Low voltage stimulation of the microbial degradation of weathered PCBs observed in this study suggests that this approach could be a cost-effective, environmentally sustainable strategy to remediate PCBs in situ.

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Section: Resultsmentioning

confidence: 99%

Electrical stimulation of microbial PCB degradation in sediment

et al. 2013

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“…Experimentally, benzene can also be degraded under anaerobic conditions by or in the presence of sulfate-, nitrate-, or iron-reducing bacteria [16,17], the same types of bacteria that often function in MFCs as exoelectrogens. The complete mineralization of benzene to carbon dioxide releases 30 electrons [18,19], and in MFCs these electrons can be transferred to molecular oxygen in the atmosphere via electrical wires connecting the cathode and anode, circumventing the need for aeration of underground water. Zhang and coworkers [20] showed that a low level (9 mM) of benzene in petroleum-contaminated sediment can be degraded using the MFC technology.…”

Section: Introductionmentioning

confidence: 99%

Generation of Power by Microbial Fuel Cell with Ferricyanide in Biodegradation of Benzene

Lai

Lin

et al. 2012

CLEAN Soil Air Water

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The power generation potential of a microbial fuel cell (MFC) during the process of benzene biodegradation with potassium ferricyanide (0–200 mM) as the terminal electron acceptor was evaluated. Experimental results demonstrate that benzene was used as the sole carbon source in generating electricity by a mixed culture. The power density increased from 0.0276 to 2.1 mW m−2 as the concentration of potassium ferricyanide in the cathode chamber was increased from 0 to 200 mM. With a benzene concentration of 10.87 mg L−1 and a potassium ferricyanide concentration of between 0 and 150 mM, complete degradation of benzene was achieved in 22–24.5 h. However, when the concentration of potassium ferricyanide was raised to 200 mM, the time required for complete benzene degradation was prolonged to 35 h. The results of this investigation can be used as a basis for future assessments of the power generation capacity of MFCs that are used to treat benzene‐contaminated wastewater.

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“…On the other hand, Mn salts bear the acceptor characteristics of and electron, so they may oxidize hydrocarbons at anaerobic conditions. Research was carried out using Mn (IV) for oxidation of aliphatic and aromatic hydrocarbons (Villatoro-Monzón et al 2008).…”

Section: Resultsmentioning

confidence: 99%