@article {726,
	title = {Biodegradation of ethylene dibromide (1,2-dibromoethane [EDB]) in microcosms simulating in situ and biostimulated conditions.},
	journal = {J Hazard Mater},
	volume = {209-210},
	year = {2012},
	month = {2012 Mar 30},
	pages = {92-8},
	abstract = {Although 1,2-dibromoethane (EDB) is a common groundwater contaminant, there is the lack of knowledge surrounding EDB biodegradation, especially under aerobic conditions. We have performed an extensive microcosm study to investigate the biodegradation of EDB under simulated in situ and biostimulated conditions. The materials for soil microcosms were collected from an EDB-contaminated aquifer at the Massachusetts Military Reservation in Cape Cod, MA. This EDB plume has persisted for nearly 40 years in both aerobic and anaerobic EDB zones of the aquifer. Microcosms were constructed under environmentally relevant conditions (field EDB and DO concentrations; incubated at 12{\textdegree}C). The results showed that natural attenuation occurred under anaerobic conditions but not under aerobic conditions, explaining why aerobic EDB contamination is so persistent. EDB degradation rates were greater under biostimulated conditions for both the aerobic and anaerobic microcosms. Particularly for aerobic biostimulation, methane-amended microcosms degraded EDB, on average, at a first order rate eight times faster than unamended microcosms. The best performing replicate achieved an EDB degradation rate of 7.0 yr(-1) (half-life (t(1/2))=0.10 yr). Residual methane concentrations and the emergence of methanotrophic bacteria, measured by culture independent bacterial analysis, provided strong indications that EDB degradation in aerobic methane-amended microcosms occurred via cometabolic degradation. These results indicate the potential for enhanced natural attenuation of EDB and that methane could be considered co-substrate for EDB bioremediation for the EDB-contaminated groundwater in aerobic zone.},
	keywords = {Aerobiosis, Anaerobiosis, Biodegradation, Environmental, Ethylene Dibromide, Water Microbiology, Water Pollutants, Chemical},
	issn = {1873-3336},
	doi = {10.1016/j.jhazmat.2011.12.067},
	author = {McKeever, Robert and Sheppard, Diane and N{\"u}sslein, Klaus and Baek, Kyung-Hwa and Rieber, Khalil and Ergas, Sarina J and Forbes, Rose and Hilyard, Mark and Park, Chul}
}
@article {736,
	title = {Hydrogenotrophic denitrification and perchlorate reduction in ion exchange brines using membrane biofilm reactors.},
	journal = {Biotechnol Bioeng},
	volume = {104},
	year = {2009},
	month = {2009 Oct 15},
	pages = {483-91},
	abstract = {Halophilic (salt loving), hydrogenotrophic (H(2) oxidizing) denitrifying bacteria were investigated for treatment of nitrate (NO3-) and perchlorate (ClO4-) contaminated groundwater and ion exchange (IX) brines. Hydrogenotrophic denitrifying bacteria were enriched from a denitrifying wastewater seed under both halophilc and non-halophilc conditions. The cultures were inoculated into bench-scale membrane biofilm reactors (MBfRs) with an "outside in" configuration, with contaminated water supplied to the lumen of the membranes and H(2) supplied to the shell. Abiotic mass transfer tests showed that H(2) mass transfer coefficients were lower in brines than in tap water at highest Reynolds number, possibly due to increased transport of salts and decreased H(2) solubility at the membrane/liquid interface. An average NO3- removal efficiency of 93\% was observed for the MBfR operated in continuous flow mode with synthetic contaminated groundwater. Removal efficiencies of 30\% for NO3- and 42\% for ClO4- were observed for the MBfR operated with synthetic IX brine in batch operating mode with a reaction time of 53 h. Phylogenetic analysis focused on the active microbial community and revealed that halotolerant, NO3- -reducing bacteria of the bacterial classes Gamma-Proteobacteria and Sphingobacteria were the metabolically dominant members within the stabilized biofilm. This study shows that, despite decreased H(2) transfer under high salt conditions, hydrogenotrophic biological reduction may be successfully used for the treatment of NO3- and ClO- in a MBfR.},
	keywords = {Bacteroidetes, Biofilms, Cluster Analysis, DNA, Bacterial, DNA, Ribosomal, Gammaproteobacteria, Hydrogen, Ion Exchange, Membranes, Molecular Sequence Data, Nitrites, Oxidation-Reduction, Perchloric Acid, Phylogeny, RNA, Ribosomal, 16S, Sequence Analysis, DNA, Water Pollutants, Chemical, Water Purification},
	issn = {1097-0290},
	doi = {10.1002/bit.22414},
	author = {Sahu, Ashish K and Conneely, Teresa and N{\"u}sslein, Klaus and Ergas, Sarina J}
}
@article {743,
	title = {Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments.},
	journal = {Chemosphere},
	volume = {70},
	year = {2007},
	month = {2007 Dec},
	pages = {329-36},
	abstract = {Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94\% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75\% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus Dechloromonas in 16S rDNA clone libraries.},
	keywords = {Arsenic, Betaproteobacteria, Biodegradation, Environmental, DNA, Bacterial, DNA, Ribosomal, Fresh Water, Geologic Sediments, Massachusetts, Nitrates, Oxidation-Reduction, RNA, Ribosomal, 16S, Urbanization, Water Microbiology, Water Pollutants, Chemical},
	issn = {0045-6535},
	doi = {10.1016/j.chemosphere.2007.05.094},
	author = {Gibney, Brian P and N{\"u}sslein, Klaus}
}
