Emerging Contaminants Summit

Spring 2020

abramsStewart Abrams
Vice President & Director of Remediation Technology 
Langan Engineering & Environmental Services, Inc. 

Mr. Abrams has over 35 years of experience in site remediation, soil and groundwater remediation, water treatment, Brownfields redevelopment, and engineering design. He is an expert in remedial technology, with particular emphasis on bioremediation, chemical oxidation/reduction technologies, soil vapor extraction, and air sparging. He also has extensive experience in water process engineering, notably water and wastewater treatment and industrial waste treatment for organics and metals. He has recently become involved in the emerging fields of emerging contaminants and sustainable remediation. Before joining Langan, Mr. Abrams held positions of National Practice Leader for Remediation at a major national consulting and engineering company and as vice president of operations at an environmental R&D firm. He is the founder of Langan's treatability facility, a joint venture with the New Jersey Institute of Technology (NJIT), whereby Langan personnel perform a wide variety of treatability studies for soil, groundwater and sediments.

Mr. Abrams holds a B.S. In Civil/Environmental Engineering, B.A. in Political Science and M.S. in Environmental Sciences from Rutgers University in New Brunswick, NJ and is a Professional Engineer in several states.

 

FLASH POSTER PRESENTATION

Drinking Water Combined Treatability Study for TCE, Dioxane and PFAS Compounds

Langan has been working with an industrial responsible party and a municipality to upgrade an existing municipal well field that has recently been shown to contain both 1,4-dioxane and PFAS compounds. An existing air stripping system, installed in the 1980s, exists at the site to treat chlorinated solvents in drinking water. The system was originally designed for 700 gpm, but in recent years has operated at less than 200 gpm. Langan is performing a comprehensive treatability study to assess treatment alternatives to either replace or upgrade the existing treatment system to address the emerging contaminants, as well as the chlorinated solvents, primarily TCE, as well as restore the systems operability to 400 gpm. Advanced oxidation processes (AOP) processes are to be tested. AOP processes generate the radicals necessary to degrade the 1,4-dioxane. The specific AOPs to be tested are Ultraviolet-catalyzed peroxide (UV/H2O2) and TiO2-catalyzed UV (TiO2/UV). TiO2/UV represents an opportunity to treat the water at lower operational cost, though this technology has not been widely used for drinking water, but more widely for site remediation. Water treated by both of these technologies will be further treated by granular activated carbon (GAC) to establish the effectiveness of GAC for further removal of PFAS compounds. Agglomerated bituminous carbon has been selected for testing, based upon its wide acceptance in the drinking water industry for the treatment of PFAS compounds. The treatability of Total Oxidizable Precursors (TOP) will be assessed at every step of the potential treatment process. Poly-fluorinated compounds tend to degrade or become oxidized to perfluorinated compounds, in turn potentially increasing concentrations of PFAS. In addition, effects of using AOP and GAC on the generation and removal of disinfection by-products (DBPs) will also be assessed. The findings of the treatability study will be used to define a revised process that will define the full-scale implementation. In particular, whether the existing air stripper is retained or abandoned will determined. This preliminary process would be presented as part of this paper.

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