Remediation Technology Demonstration Project Profiles
In Situ Bioremediation Using Lactate and Emulsified Vegetable Oil (EVO) in the Mojave Desert in California
Last Updated: June 29, 2007 |
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| Site Identifying Information | ||
| Site Name, Location: | Chromium-Contaminated Site in Mojave Desert, California, United States
(EPA Region 9) |
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| Cleanup Program: | Not Specified | |
| Entity Responsible for Cleanup: | Not Specified | |
| Site Type: | Not Specified | |
| Government Affiliation: | Non-Federal | |
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| Project Information | ||||||||||
| Project Name: | In Situ Bioremediation Using Lactate and Emulsified Vegetable Oil (EVO) in the Mojave Desert in California | |||||||||
| Project Status: | Complete | |||||||||
| Contaminants Treated: |
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| Media Treated: |
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| Demonstration Technology and Type: | Enhanced Bioremediation (In Situ) (In Situ Biological) |
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| Demonstration Year: | 2006 | |||||||||
| Year of Publication: | 2006 | |||||||||
| Goal of the Demonstration: | To evaluate and compare two electron donors - lactate and emulsified vegetable oil (EVO) - for promotion of biological reduction of Cr(VI). | |||||||||
| Design and Operations: | Two 50-feet pilot test cells were used to individually evaluate the use of lactate and EVO. Both tests used passive injection and active in-line and cross-gradient recirculation within the aquifer. Lactate dosing was conducted weekly to biweekly during passive and active recirculation, while EVO was injected once at the beginning of the passive operation and two times during the active recirculation process. Passive treatment was evaluated for 3 months, which resulted in the treatment of Cr(VI) 15 feet downgradient of the injection point at each test cell. | |||||||||
| Performance Data Relevant to Demonstration Goals: | At the TC1 test cell and half of the TC2 test cell the chromium levels were below the method detection limit levels needed. | |||||||||
| Interesting Aspects or Significance of the Demonstration: | Unusual or Novel Aspects of Technology Design | |||||||||
| Lessons Learned: | Lactate was effectively distributed throughout the 50-foot length of TC1, as demonstrated by the presence of biological breakdown products in the samples collected in the downgradient extraction well. The less soluble EVO was distributed 25 feet downgradient from the injection point. | |||||||||
| Vendor(s) or Consultant(s) Associated with the Demonstration: |
CH2M Hill, Inc. |
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| Information Source(s) for the Demonstration: |
Tossell, Robert W., Gene Ng, Bradley Johnson, Dennis Maslonkowski, and Tess Byler. Successful In Situ Bioremediation of Hexavalent Chromium in the Mojave Desert. Presented at the 5th International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California (May 22-25, 2006). http://www.battelle.org/bookstore# |
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| Contact Information | ||||||||||
| Point(s) of Contact: |
Gene Ng CH2M HILL Oakland, California, United States |
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Bradley Johnson CH2M HILL Oakland, California, United States |
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Dennis Maslonkowski CH2M HILL Oakland, California, United States |
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Tess Byler CH2M HILL Oakland, California, United States |
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Robert Tossell (Primary Contact) CH2M HILL Waterloo, Ontario, Canada E-mail: btossell@ch2m.com |
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