Show simple item record Sarauskas, Tom en_US 2007-05-25T18:30:55Z 2007-05-25T18:30:55Z 1999-07-01T00:00:00Z en_US
dc.description.abstract Studies have found that under constant environmental conditions, the rate of biodegradation of petroleum hydrocarbons decreases with time and may become negligible after a period. This decrease in the availability of hydrocarbons for biodegradation can be attributed to the diffusion of the hydrocarbons into soil micropores, the partitioning of the hydrocarbons into soil organic matter, strong surface adsorption or a combination of these processes. Studies have also shown that naturally occurring freeze-thaw cycles act to disrupt soil aggregates to physically change the soil's structure. This study investigated the effects of freeze-thaw cycles on the biodegradation rates of hydrocarbon contaminated soils. A diesel fuel contaminated soil was bioremediated in bench-scale reactors until respiration monitoring indicated a decrease in microbial activity. Designated reactors were then subject to 1, 3, 6 and 9 freeze-thaw cycles. The results indicated an increase in the microbial activity in the freeze-thaw treated reactors, while the microbial activity in the control reactors decreased over the same period of time. The results also indicated that microbial activity increased with increasing numbers of freeze-thaw cycles. en_US
dc.format.extent 7175458 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
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dc.language en en_US
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title The effects of freezing and thawing on the bioremediation of a diesel fuel contaminated soil en_US
dc.type info:eu-repo/semantics/masterThesis Civil Engineering en_US Master of Science (M.Sc.) en_US

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