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Using chemical priming as a means of enhancing the performance of biocells for treating petroleum products containing recalcitrant chemical species.
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1998-12-01
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[PDF-722.29 KB]
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Edition:Final report; 1996-1998.
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Abstract:Biocell technology is a soil remediation technology that utilizes commercial roll-off dumpsters as simple,
yet effective bioreactors. Reported implementation costs for biocells range from $20 - $40 per cubic yard
treated. Biodegradation of some petroleum hydrocarbons has been found to be difficult in terms of both
the rate and extent of removal. Since petroluem products are literally made up of numerous organic
chemcials, some of these chemicals are difficult to degrade due to bacterial associated limitations (i.e.
enyzme reactivity toward targeted chemicals or cell permeability hinderances) and/or adsorption onto soil
particles, which greatly limits the bioavailability of the pollutants to the cells. Chemical priming involves
the addition of powerful chemical oxidizers, such as ozone and/or hydrogen peroxide, to chemically
transform the targeted chemicals into more biodegradable compounds, plus the oxidizers attack the sorptive
bonds between the soil and chemical(s) to increase bioavailability. Results from this study showed that the
addition of chemical oxidizers, after a period when biodegradation rates approached zero, yet significant
product remained in the soil, greatly enhanced the rate and extent of removal. The addition of the chemical
oxidizer immediately reduced some of the petroleum in the soil via direct oxidation, plus restarting
bioremediation after chemical priming also reduced a significant portion of the residual petroleum products
in the soil samples. The major conclusion was that chemical priming indicated a high potential for
enhancing the performance of bioremediation systems attempting to treat soils contaminated with petroleum
products containing appreciable amounts of refractory chemicls.
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