V.P. National Director of Remediation
Matrix New World Engineering
Known throughout the U.S. and worldwide for her work developing innovative solutions to address water and soil contamination issues, Dr. LaPat-Polasko has a Ph.D. in Microbiology from the University of Maryland, a M.S. and Engineers Degree in Civil and Environmental Engineering from Stanford University, and a B.S. in Biology from Chatham University. She combines her knowledge of biology, environmental engineering, and microbiology to develop and design innovative “bioremediation” approaches to clean up contaminated sites, creating a green, cost-effective method to degrade diverse contaminants, such as chlorinated solvents, explosives, fuel compounds, and emerging contaminants.
In Situ Bioremediation of Chlorinated Solvents Using Various Injection Approaches
The purpose of the In Situ Bioremediation (ISB) systems was to promote reductive dechlorination of chlorinated ethenes in groundwater via biostimulation in combination with bioaugmentation in the impacted areas. Several different plumes containing elevated concentrations of chlorinated volatile organic compounds (cVOCs) were subjected to ISB using various injection approaches such as recirculation wells, injection points and injection wells. Recirculation wells were installed at sites in California, Pennsylvania and New Jersey to inject carbon sources and microbial consortium into the groundwater to enhance reductive dechlorination of cVOCs. Direct injection points were utilized at sites in California and Indiana, which showed significantly different hydrogeologic conditions. This presentation will discuss why different injection approaches were selected for each site and how the different delivery approaches affected the distribution of the amendments in different hydrogeologic conditions and likewise, impacted the effectiveness of reductive dechlorination in site groundwater.