Water and wastewater treatment processes focusing on: Adsorption, membrane, and membrane bioreator technologies; Emerging micropollutants including pharmaceuticals, endocrine disruptors, and homeland security contaminants; Bio-energy recovery from human, animal and food waste streams; New materials for water purification and other aqueous phase separations- adsorbents, membranes, catalysts, etc.; Integrated water reuse systems; Environmental occurrence, transport and effects of nanomaterials and pharmaceuticals;Intelligent infrastructure for self-optimizing water systems.

Hydrological Modelling and Predictive Uncertainty; Hydro-climatology: Climate Change and Variability; Human Impacts on Water Quantity and Quality; Biogeochemical Cycling and Riverine Water Quality

Research focuses on mechanisms controlling the fate of aquatic pollutants in both engineered treatment processes and natural systems, with a special emphasis on reduction-oxidation (redox) processes that are mediated by metal species (e.g., nanophase metal catalysts, dissolved metal complexes, soil minerals). Current research includes the development of advanced water treatment technologies for emerging micropollutants (e.g., pharmaceuticals, hormones, nitrogenous disinfection byproducts) and conversion of wastes and biomass to energy.

Research focuses upon mathematical modeling of pollutant fate and transport in porous media, with applications to groundwater contamination and remediation. Specializes in the development and application of models that couple physical, geochemical, and microbiological processes over a wide range of spatial scales ranging from the pore scale (micrometers) to the field scale (kilometers).