United States Department of Transportation
i
Effectiveness of Microbe Application to Petroleum Spills at Crash Sites
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2012-03-01
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[PDF-1.27 MB]
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Abstract:Each year vehicular accidents cause gasoline and diesel spills on Arizona roadways. ADOT currently uses Micro-Blaze®, a commercially available microbial solution, as a supplement to natural degradation of vehicular petroleum spills in soils. With an emphasis on minimizing or eliminating environmental and public health hazard, ADOT is interested in determining cost-effective methods to address spills involving petroleum products from roadway vehicular accidents. This study investigated whether Micro-Blaze, Hydro Clean®, Miracle-Gro®, or water accelerated the degradation process significantly over natural processes and that it will help to determine their effectiveness in accelerating the remediation of petroleum products (diesel No. 2 and unleaded gasoline) on predominant Arizona soil types from roadway vehicular accidents. The soil types evaluated were aridisols from Burro Creek, alfisols from Show Low, and entisols from Mesa. All three soil types contaminated with gasoline showed a reduction in BTEX levels to below ADEQ’s SRLs within 21 days, even in the absence of added microorganisms or nutrients. In none of the sample treatments was the diesel (total petroleum hydrocarbon) concentration below either residential or non-residential SRLs by day 83. The results are discussed referencing ADEQ’s SRL in effect for 2006; ADEQ changed SRLs in 2007. When compared to the new 2007 levels, BTEX are below SRL and there is no longer an ADEQ SRL for total petroleum hydrocarbon.
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