Environmental Engineer and Scientist at Fishbeck with a demonstrated history of working in bioremediation. The speaker has a PhD focused on Environmental Engineering/Microbiology/Chlorinated solvents bioremediation from Michigan State University and a postdoc from University of Illinois Urbana-Champaign. Currently, Fernanda works at various sites nation wide most of them contaminated with emergent contaminants such as chlorinated solvents or PFAS.
Chlorinated Solvents Source Area Remediation by a Combination of Biotic and Abiotic Enhanced Reduction Approaches
This case study presents remediation of soil and groundwater impacted with trichloroethene (TCE) beneath a former degreaser area in an active manufacturing plant located in Michigan. The site was initially remediated with enhanced reductive dechlorination (ERD) utilizing emulsified oil injections followed by inoculation with Dehalococcoides. Groundwater monitoring over 10 years showed dramatic (over 98%) reduction in CVOC concentrations in the impacted area; however, significant TCE concentrations persisted in the primary source area. Abiotic injections composed of a combination of lecithin, ferrous sulfate, and a buffer, were used to form iron sulfide minerals in situ and establish an alternate abiotic reductive pathway in the source zone in 2015. As of July 2020, results show significant reduction of TCE in the primary source area (250,000 to 225 µg/L). Although not always considered, abiotic degradation can contribute, at least in part, to chlorinated solvent remediation efforts.