Faculty research interests emphasize the following areas: biodegradation of municipal solid waste and aqueous organics; biological conversion of waste materials to useful forms of energy, such as methane and hydrogen; life-cycle analysis of engineered environmental systems; bioremediation of contaminated ground water; coagulation, flocculation, and sedimentation in aqueous systems; mitigation of odor potential at wastewater and solid waste treatment facilities; bioremediation of contaminated ground water; environmental geotechnics; vertical subsurface barriers for the remediation of hazardous waste sites; transformation of slurry trench cutoff wall materials from the passive hydraulic barrier materials into active treatment materials while maintaining their passive hydraulic barrier characteristics; watershed processes and land surface-atmosphere interactions; appropriateness of existing numerical models for nonlinear transport processes in environmental systems; adsorption of heavy metals by microorganisms; characterization of pollution from agricultural sources.