June 13th Meeting (w copy of presentation)

For a copy of the presentation, see here.

Air and Waste Management Members, Associates, Students and Friends –

Please join us for A&WMA’s Central Texas Chapter’s meeting on Thursday, June 13th!

Topic: Bench-Scale Treatability Studies on Emerging Contaminants: PFAS and 1,4-Dioxane

If you Google “PFAS” or “1,4-dioxane” in the news, you’ll find dozens of recent articles of contamination making headlines.  Emerging contaminants such as per- and polyfluoroalkyl substances (PFAS) and 1,4-dioxane have gained relevance in remediation due to their physico-chemical properties, recalcitrant nature, mobility in water, and the health risks they pose to the public. Effective in-situ treatment of these contaminants is challenging; therefore, bench-scale treatability studies become highly valuable at testing different remediation technologies in laboratory-scale before performing pilot or field-scale implementation. This presentation walks through two examples of bench-scale treatability studies that cover: (1) the evaluation of PFAS removal from groundwater via adsorption by using biochar-amended mixed media; and (2) the evaluation of 1,4-dioxane bioremediation alternatives that include biostimulation using alkane gases and bacteria bioaugmentation.

Speaker: Francisco J. Barajas, PhD, AECOM

Dr. Barajas is an environmental engineer and laboratory manager at AECOM in Austin, Texas, and has been conducting treatability studies on the remediation of PFAS, 1,4-dioxane, chlorinated solvents and other contaminants, as well as on industrial wastewater treatment. Most of his studies involve mechanisms based on biological and physico-chemical processes such as anaerobic reductive dechlorination, aerobic biodegradation, chemical oxidation/reduction, electrochemical oxidation, adsorption, and solidification/stabilization. In addition, his research experience covers experiments on aerobic metabolism and cometabolism of 1,4-dioxane, and subsurface remediation simulations. Dr. Barajas holds a doctorate degree in Environmental Engineering from Clemson University and a bachelor’s degree in Chemical Engineering from Universidad de Sonora.



9400 Amberglen Boulevard

Austin, Texas 78729-1100


5:30 – 6:00 p.m. – Reception and Meal
6:00 – 6:05 p.m. – Central Texas Chapter Business
6:05 – 7:00 p.m. – Presentation