Importance of unattached bacteria and bacteria attached to sediment in determining potentials for degradation of xenobiotic organic contaminants in an aerobic aquifer

Article Abstract:

The ability of attached and unattached bacteria to degrade benzene, toluene, o-xylene and naphthalene in an aerobic aquifer were determined under field and laboratory conditions. The results showed that after 90 days, majority of the aquifer microbial biomass was attached to groundwater sediment. Similar degradation behaviors were found in laboratory experiments involving aquifer sediment suspensions. Groundwater experiments showed significantly less degradation potential. These results indicate that degradation is associated with bacteria bound to fine-particle sediments. In order to obtain reliable laboratory results, degradation tests should include fine sediments.

Water, Aquatic microbiology, Aquifers, Xenobiotics, Sediments (Geology)

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Stimulation of reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by addition of short-chain organic acids or alcohols

Article Abstract:

Addition of certainshort-chain organic acids and alcohols to the environment can stimulate the dehalogenation of tetrachloroethene (PCE). This was based on studies analyzing the effect of four fatty acids and three alcohols on TCE dehalogenation activity in chloroethene-contaminated aquifier microcosms. Results show that dehalogenation was stimulated by lactate, propionate, crotonate, butyrate and ethanol. Acetate, methanol and isopropanol had no stimulatory effect. These results are potentially useful in optimizing dechlorination activities in PCE-contaminated areas.

Vinyl chloride, Alcohols, Organic acids

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Aerobic biodegradation of methyl tert-butyl ether by aquifer bacteria from leaking underground storage tank sites

Article Abstract:

The biodegradation of methyl tert-butyl ether (MTBE) at leaking underground storage sites will vary depending on the presence of water and oxygen. Molecular phylogenetic analysis can be used to determine whether any MTBE-degrading bacteria are present at the site.

MTBE, Methyl tertiary butyl ether

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