Microbial potential for the anaerobic degradation of simple aromatic compounds in sediments of the Milwaukee Harbor, Green Bay and Lake Erie

Myers, Charles R.; Alatalo, Laura J.; Myers, Judith M.

doi:10.1002/etc.5620130314

Cited by 9 publications

(6 citation statements)

References 44 publications

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“…Groundwater aquifers have been contaminated with a wide variety of hazardous organic chemicals as a result of both primitive waste disposal practices and accidental releases [1, 2]. Common contaminants include petroleum hydrocarbons, chlorinated solvents, ketones and ethers.…”

Section: Introductionmentioning

confidence: 99%

Influence of protozoan grazing on contaminant biodegradation

Kota

Borden

Barlaz

1999

FEMS Microbiology Ecology

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The influence of protozoan grazing on biodegradation rates in samples from contaminated aquifer sediment was evaluated under aerobic and anaerobic conditions. Predator–prey biomass ratios suggested that protozoan grazing might be influencing bacterial populations. Experiments under aerobic conditions were conducted with a sediment extract fed with BTEX and treated with protozoan inhibitors (cycloheximide, neutral red, amphotericin‐B). After 10 days, BTEX losses were enhanced in the presence of protozoan inhibitors, suggesting that reduced protozoan grazing enhanced the rate of BTEX biodegradation. In tests conducted in macrocosms under anaerobic conditions, treatments included benzaldehyde (carbon substrate), benzaldehyde+cycloheximide, a live control (no carbon), and an abiotic control. In both the benzaldehyde‐only and benzaldehyde+cycloheximide treatments, repeated benzaldehyde additions resulted in an increase in the total fermenter population from 103 to 105 cells (g sediment)−1 and in the Fe‐reducing population from 101 to 105 cells g−1. However, the protozoan population remained at about 20 cells g−1 in the sediment with no cycloheximide, and there was no difference in benzaldehyde biodegradation in the presence and absence of cycloheximide, suggesting that predation was not a significant control on anaerobic benzaldehyde biotransformation.

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Section: Introductionmentioning

confidence: 99%

Influence of protozoan grazing on contaminant biodegradation

Kota

Borden

Barlaz

1999

FEMS Microbiology Ecology

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“…Nonetheless, the anaerobic degradation of aniline has been observed under nitrate reduction (Bollag and Russel, 1976), sulphate reduction (Schnell et al, 1989), and methanogenic conditions (Myers et al, 1994). Alexandra et al (1994) reported that aniline was completely mineralized to CO, and N, in estuarine sediment under anaerobic denitrifying conditions amended with bicarbonate.…”

Section: Discussionmentioning

confidence: 98%

“…Longer incubation periods might be needed for aniline biotransformation. Myers et al (1994) examined the potential for the anaerobic degradation of benzoic acid in sediments from Milwaukee Harbor, Green Bay and Lake Erie amended with Fe(OH), or MnO,, and found that while sulphate reducers might have an essential role in the degradation of benzoic acid, methanogens did not. In the present study, we found that either methanogens or sulphate reducers might have a role in benzoic acid removal in a freshwater environment, while sulphate reducers might have an essential role in benzoic acid removal in an oceanic environment.…”

Section: Discussionmentioning

confidence: 99%

Microbial Potential for the Anaerobic Transformation of Simple Homocyclic and Heterocyclic Compounds in Sediments of the Tsengwen River

Liu

Kuo

1996

Chemistry and Ecology

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The ability of microbial populations to mediate the anaerobic transformation of four aromatic compounds (aniline, benzoic acid, pyridine, and quinoline) in sediments of the Tsengwen River was examined. Along the river, from a freshwater (0.0%, salinity) to an oceanic (37.0%, salinity) environment, five sampling stations were chosen to collect the sediment. Sediment slurries were incubated in an anaerobic mineral salts medium that was amended with multiple electron acceptors, including manganese (IV) and ferric (111) oxides, and the concentrations of the aromatic substrates were followed over a 3-to 4-month period. Most sediment samples showed a complete loss of benzoic acid and quinoline (0.12-0.21 mM) within approximately three months. Pyridine was transformed after a lag period of 53 days in the sediment slurries from the freshwater environment which had been amended with both metal oxide (either Fe (OH), or MnO,) and inhibitor (either BESA or molybdate). Pyridine was not transformed in other sediment slurries. No significant metabolism of aniline was apparent in any of the sediments.

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“…Hence, abiotic dechlorination of CPs due to Fe 2ϩ produced by microbial Fe reduction was not a factor. Meyers et al (23) reported that initial loss of benzoate, aniline, 4-hydroxybenzoate, and 3-CB occurred in enrichments to which amorphous Fe oxide was added. It is not clear from this study, however, whether oxidation of the aromatic substrates occurred at the expense of iron reduction.…”

Section: Discussionmentioning

confidence: 99%

Degradation of Monochlorinated and Nonchlorinated Aromatic Compounds under Iron-Reducing Conditions

Kazumi¹,

Häggblom²,

Young³

1995

Appl Environ Microbiol

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The capacity for Fe 3؉ to serve as an electron acceptor in the microbial degradation of monochlorinated and nonchlorinated aromatic compounds was investigated in anoxic sediment enrichments. The substrates tested included phenol, benzoate, aniline, their respective monochlorinated isomers, o-, m-, and p-cresol, and all six dimethylphenol isomers. Phenol and 2-, 3-, and 4-chlorophenol were utilized by anaerobic microorganisms, with the concomitant reduction of Fe 3؉ to Fe 2؉. The amount of Fe 2؉ produced in the enrichments was 89 to 138% of that expected for the stoichiometric degradation of these substrates to CO 2 , suggesting complete mineralization at the expense of Fe reduction. Under Fe-reducing conditions, there was initial loss of benzoate and 3-chlorobenzoate but not of 2-or 4-chlorobenzoate. In addition, there was initial microbial utilization of aniline but not of the chloroaniline isomers. There was also initial loss of o-, m-, and p-cresol in our enrichments. None of the dimethylphenol isomers, however, was degraded within 300 days. Furthermore, we tested the capacity of an Fe-reducing, benzoate-grown culture of Geobacter metallireducens GS-15 to utilize monochlorinated benzoates and phenols. G. metallireducens was able to degrade benzoate and phenol but none of their chlorinated isomers, suggesting that the degradation of chlorophenols in our sediment enrichments may be due to novel Fe-reducing organisms that have yet to be isolated.

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Microbial potential for the anaerobic degradation of simple aromatic compounds in sediments of the Milwaukee Harbor, Green Bay and Lake Erie

Cited by 9 publications

References 44 publications

Influence of protozoan grazing on contaminant biodegradation

Influence of protozoan grazing on contaminant biodegradation

Microbial Potential for the Anaerobic Transformation of Simple Homocyclic and Heterocyclic Compounds in Sediments of the Tsengwen River

Degradation of Monochlorinated and Nonchlorinated Aromatic Compounds under Iron-Reducing Conditions

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