Learn More
Frequent discoveries of groundwater contamination arising from use, storage, and disposal of hazardous chemicals underscore the need for an understanding of and ultimately the ability to predict the mechanisms of transport of contaminants in the subsurface. In particular, there has been a tremendous interest in developing computerized contaminant transport(More)
A comprehensive compilation of published studies reporting directly measured experimental determinations of Henry's law constant (HLC) temperature dependence relationships for organic compounds in dilute, non-saline aqueous solutions under ambient conditions was conducted. From this effort, 55 such studies (covering 204 organic compounds) were identified,(More)
Enhanced in-situ transformation of carbon tetrachloride (CT) was observed under anoxic conditions created through biostimulation. The transformation of l,l,l-tri-chloroethane (TCA), and two chlorofluorocarbons [tri-chlorofluoromethane (CFC-ll) and 1,1,24richloro-1,2,2,-trifluoroethane (CFC-113)], was also indicated. The evaluation was conducted in a shallow(More)
rn The transfer of six organic compounds and of oxygen from aqueous solution to the atmosphere was studied by using an agitated vessel contactor. The transfer rate constants were measured under conditions of controlled energy input in the range P/ V = 0.8 to 320 W/m3. The data were interpreted on the basis of the assumption of liquid-phase control. The(More)
Bacterial resistance to inactivation by antibacterial agents that is induced by the growth environment was studied. Escherichia coli was grown in batch culture and in a chemostat, and the following parameters were varied: type of substrate, growth rate, temperature, and cell density during growth. Low doses (0.75 mg/liter) of chlorine dioxide were used to(More)
The mode of action of chlorine dioxide on Escherichia coli was assessed by studying outer membrane permeability to macromolecules and potassium, and observing effects on respiration. The results indicate that gross cellular damage involving significant leakage of intracellular macromolecules does not occur. There was a substantial efflux of potassium,(More)
A method was developed to grow Legionella pneumophila in continuous culture. A chemostat was used to simulate nutrient-limited, submaximal growth in the natural environmental and to provide a precisely controlled growth regimen. Cultures grew under forced aeration under conditions yielding up to 38% saturation of dissolved oxygen; supplemental CO2 (5%) at(More)