Reactive Transport Modeling: A New Paradigm in Design of In Situ Treatment Systems

Monday, December 4, 2017: 10:50 a.m.
101 C (Music City Center)
Robert Mutch Jr., P.Hg., P.E. , Mutch Associates, LLC
Richard Carbonaro, Ph. D., P.E. , Mutch Associates, LLC, Ramsey, NJ

Application of three-dimensional, numerical, reactive transport modeling is emerging, we believe, as a new paradigm in the design process of in situ treatment systems. Its rapid emergence as a design tool is reminiscent of the paradigm that began to appear in the early 1980s when use of numerical groundwater flow modeling started to become standard practice in the design of groundwater extraction systems (despite the now apparent limitations in software and hardware at the time). In the last few years, reactive transport modeling has been applied with great success to evaluation and design of in situ chemical oxidation (ISCO), in situ chemical reduction (ISCR), and both aerobic and anaerobic in situ bioremediation (ISB) systems. Experience has shown that it can help optimize the performance of in situ treatment (IST) remedies, reduce the risk of outright failure, and save overall costs. A reactive transport model is built upon the foundation of a three-dimensional groundwater flow model and includes the ability to model the chemical interactions between injected substrates or chemicals and the contaminants of concern; between the injected chemicals and the aquifer skeleton; and other subsidiary reactions. As with any numerical model, best results are obtained when the model is calibrated to laboratory and field data. Several case studies will be briefly described where three-dimensional, reactive transport models were instrumental in the evaluation and design of full-scale ISCR, ISCO, and ISB systems.

Slides in PDF
Robert Mutch Jr., P.Hg., P.E., Mutch Associates, LLC
Robert Mutch Jr. is President and Principal Groundwater Hydrologist of Mutch Associates in Ramsey, New Jersey. He has more than 35 years of experience in hydrogeology, groundwater modeling, environmental forensics, and remediation engineering. His areas of specialization include numerical modeling of groundwater flow and solute transport, environmental forensics, DNAPL behavior, and fractured rock hydrogeology. Mutch has also been an Adjunct Professor at Manhattan College for 20 years and at Columbia University for seven years, where he teaches graduate level courses in applied hydrogeology, contaminant transport in the environment, and groundwater and contaminant transport modeling.

Richard Carbonaro, Ph. D., P.E., Mutch Associates, LLC, Ramsey, NJ
Richard Carbonaro has extensive experience in the field of fate and transport of metals and other contaminants in soils and sediments. He has managed research projects related to water quality monitoring of urban pollutants, transport modeling of metals in sediments, unit-world modeling of metals in lakes for toxicity assessment, and partitioning of metals onto organic carbon. His doctoral work focused on the environmental fate and transformations of chromium in the environment. Carbonaro is also experienced in developing, modifying, and using mathematical solute transport models for both steady state and time-variable conditions.

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