Our next webinar is scheduled for Thursday, January 17, 2019 12:00 PM – 1:00 PM EDT, featuring Dr. Eric Suchomel.
SiREM’s webinar series features guest speakers who are subject matter experts to provide the latest information on technology advances in environmental remediation and site characterization. The webinars will combine recent research and development activities for new and emerging contaminants and technologies with real word applications to characterize and remediate contaminated sites.
We hope you will join us for our next webinar:
In Situ Bioremediation and In Situ Chemical Reduction for Remediation of 1,2,3-Trichloropropane in Groundwater
1,2,3-trichloropropane (TCP) is an emerging groundwater contaminant that is present in widely-used soil fumigants. Individual states have or are in the process of developing regulatory levels for TCP that are as low as 0.0005 micrograms per liter (µg/L). Remedial technologies for TCP that have been implemented at scales ranging from laboratory treatability studies to full-scale field implementation include in situ bioremediation (ISB) and in situ chemical reduction (ISCR).
For ISB, research is ongoing to understand the extent to which Dehalogenimonas (Dhg), a bacterium capable of TCP reduction, is naturally present in groundwater at sites with TCP; whether bioaugmentation can be successfully used to enhance biodegradation of TCP in groundwater; and if so, what are the practical limitations on TCP bioremediation. Results to date confirm ISB can effectively reduce TCP in groundwater. TCP degradation was observed at lower concentrations (e.g., 10 to 50 µg/L), although Dhg growth may not be supported at these concentrations. Based on these promising results, Geosyntec implemented a field pilot test to evaluate the efficacy of ISB at reducing low levels of TCP in groundwater. This is the first known field bioaugmentation for TCP remediation, with preliminary results suggesting TCP remediation is ongoing.
For ISCR, bench-scale batch and column tests identified zero valent zinc (ZVZ) formulations suitable for remediation of TCP. Based on bench-scale results, two industrial-grade materials were further evaluated in ex situ field columns. The field column results confirmed that ZVZ is a promising material for treating TCP, with degradation of up to 95% maintained after 12 weeks of column operation, limited decreases in the rates of TCP degradation over time, and no secondary impacts to water quality. The results of the studies were used in the design of a pilot-scale ZVZ injection program. Emplacement of ZVZ via direct injection was successful, although limited by material surfacing at shallow depths. Performance monitoring data suggests that in situ degradation of TCP is occurring, with no observed secondary water quality impacts.
Eric Suchomel, Ph.D., P.E. is a Principal Engineer with Geosyntec Consultants, Inc. in Oakland, California. He has over a decade of groundwater remediation experience, focused primarily on the management of large-scale, complex chlorinated solvent sites. Dr. Suchomel is also a subject matter expert on the investigation and remediation of TCP-impacted sites, with experience implementing in situ bioremediation, chemical oxidation, and chemical reduction approaches for treating TCP at scales ranging from treatability testing to full-scale application. He received his BSE in Chemical Engineering from the University of Iowa and his MS and Ph.D. in Environmental Engineering from the Georgia Institute of Technology. He can be contacted at firstname.lastname@example.org.
Ms. Dworatzek is a Senior Manager of SiREM and an environmental microbiologist with advanced technical experience in laboratory treatability studies. Over the past 24 years she has conducted and overseen numerous bench-scale studies examining enhanced in situ remediation in groundwater. She has specific technical experience in the design of laboratory treatability studies, the scale up of growth of anaerobic microbial cultures for bioaugmentation laboratory and field pilot tests, and evaluation of aerobic and anaerobic bioremediation, zero valent iron and chemical oxidation technologies in the laboratory.