Thought Leader Webinar Series
Tersus Environmental offers a comprehensive suite of training opportunities. The Thought Leaders Webinar Series highlights the latest ideas for in situ remediation from our industry's leading thinkers. These webinars will connect you directly with these leaders so you can learn new techniques and strategies to boost your knowledge, benefit your bottom line, and serve your clients better. All webinars are taught by people who really know in situ remediation and are eager to share their knowledge with you.
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Innovative Surfactant System Formulations for LNAPL Recovery:
Technology Description and Project Design Workshop
Webinar - Thu, Sept 28th, 2017
2:00 PM - 3:00 PM EST
Jeffrey Harwell, Ph.D., Univrsity of Oklahoma
David Alden, Tersus Environmental
Technology developed at the University of Oklahoma, originally focused for enhanced oil recovery at petroleum reservoirs and subsequently adapted to the environmental arena, can lower the IFT sufficiently to allow physical mobilization of residual LNAPL with the limited production of thermodynamically stable emulsions. Dr. Harwell with start this talk by focusing on the use of artfully formulated surfactant blends that reduce solubilization and simply allow LNAPLs in saturated soils to become mobile. David Alden will follow with an example surfactant flood feasibility design and cost estimation process.
To understand the scopes, limitations, and advantages of Surfactant Enhanced Aquifer Remediation.
Jeffrey Harwell, Ph.D., University of Oklahoma
During almost 30 years at the University of Oklahoma Jeff has published nearly 200 referred papers and conference papers, and edited or coedited five books on surfactants and colloid science. His research has been supported by over $15 million in research grants, and he has performed contract research or served as a consultant for many corporation. Jeff is a Fellow of the American Institute of Chemical Engineers. He has also been recognized as the Asahi Glass Chair of Chemical Engineering at the University of Oklahoma. Full Bio
David Alden, Tersus Environmental
David Alden is a Technical Associate with Tersus Environmental where he provides technical support for Tersus’ portfolio of biotechnology-based solutions. He is a graduate of Universidad de las Americas-Puebla, Mexico, where he majored in Civil Engineering with a focus on waste-water treatment and and holds registration as a Professional Engineer in North Carolina. Alden worked for 4 years in the upstream oilfield sector performing offshore well tests and completion design and installation in the Gulf of Mexico. He participated in the in-situ oil-shale extraction experiment in the Piceance Basin, in Northwestern Colorado where protecting groundwater was the main challenge. Alden recently specialized in groundwater studies, completing a Master’s Degree program in Joseph Fourier University, Grenoble France
Development and Testing of an Analytical Method for Real Time Measurement of Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS), Dr. Rula Deeb, Geosyntec Consultants / Dr. Andy Eaton, Eurofins Eaton Analytical
Rula Deeb, Ph.D., BCEEM, PMP
Andy Eaton, PhD, BCES
Perfluoroalkyl and polyfluoroalkyl and substances (PFAS), including perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), were released to the environment at many federal and commercial facilities in the United States and elsewhere as a result of historical uses of aqueous film-forming foams (AFFF) to extinguish fuel-based fires. Due to the strength of their carbon-fluorine bonds, PFAS are persistent in the environment and difficult to remediate. Because a suite of these compounds has recently been the focus of regulatory attention, there is a growing need to characterize PFAS at groundwater impacted sites. Characterization data are needed to inform site-specific risk assessments and to guide the selection of appropriate remedial action/management approaches. The past decade of industry experience at hydrocarbon and chlorinated solvent sites has demonstrated that real time and high resolution site characterization is faster, more cost-effective and more sustainable compared with more traditional methods from a lifecycle perspective.
Current analytical methods for PFAS are fixed-lab based, expensive and require long turn-around times. The goal of this project is to develop a mobile unit capable of analyzing samples in real time in the field at a fraction of the cost required by a fixed laboratory. This technology is based on a published but relatively unknown analytical method. This presentation will describe the development and testing of a prototype mobile unit capable of analyzing PFAS samples in real time in the field.
The development of the method was based on refining and adapting an existing analytical method for the analysis of PFOA and PFOS. The testing phase was performed on samples collected from Cape Canaveral (Florida) and Barksdale Air Force Base (Louisiana). The results of the comparison of the analytical results using the real time analytical method with results using EPA methods are promising. This work is important for several reasons: (1) many AFFF-impacted sites have little to no existing monitoring wells and the extent of contamination is often unknown; (2) traditional approaches to install and sample wells using current analytical methods require a long turnaround time to receive the data; and, (3) this mobile unit, when deployed with DPT sampling, would facilitate rapid, high resolution characterization. Ongoing efforts to refine the method to reach lower detection limits and to expand the suite of PFAS that are detectable using the real-time measurement method will also be discussed.