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RISComposite Sorption of Pure Vapors on Polyolefins, Carbon, and Minerals
Publisher: American Society of Civil Engineers
Abstract: A general composite sorption isotherm is developed to predict experimental isotherms of the types I, II, and III. The isotherm, based on heterogeneous chemical thermodynamic equilibrium considerations, is used to represent ...
Modeling Concentration-Polarization in Reverse Osmosis Spiral-Wound Elements
Publisher: American Society of Civil Engineers
Abstract: The effect of feed water flow rate on the concentration-polarization of magnesium sulfate, sodium chloride, and sodium selenate in reverse osmosis (RO) spiral-wound elements was investigated and modeled. Experiments were ...
Cross-Flow versus Counterflow Air-Stripping Towers
Publisher: American Society of Civil Engineers
Abstract: Mass-transfer and pressure-drop packing performance correlations are used together with tower design equations and detailed cost models to compare the effectiveness of cross-flow and counterflow air stripping towers over ...
Pore Blockage Effects on Atrazine Adsorption in a Powdered Activated Carbon/Membrane System. I: Model Development
Publisher: American Society of Civil Engineers
Abstract: The mechanism of pore blockage plays an important role in competitive adsorption of trace organic compounds by microporous materials, such as activated carbon. An accurate description of the pore blockage effect of natural ...
Inactivation of <i>Cryptosporidium</i> Oocysts in a Pilot-Scale Ozone Bubble-Diffuser Contactor. I: Model Development
Publisher: American Society of Civil Engineers
Abstract: A mathematical model was developed to simulate the performance of a pilot-scale ozone bubble-diffuser column. The reactor hydrodynamics was represented with the axial dispersion reactor model. An analytical solution was ...
Pore Blockage Effects on Atrazine Adsorption in a Powdered Activated Carbon/Membrane System. II: Model Verification and Application
Publisher: American Society of Civil Engineers
Abstract: The bisolute model developed in Part I of this study to describe the effect of pore blockage on trace organic compound adsorption was verified and then used to study the roles of various design and operating variables on ...
Cross-Flow versus Counterflow Air-Stripping Towers
Publisher: American Society of Civil Engineers
PAC-Membrane Filtration Process. II: Model Application
Publisher: American Society of Civil Engineers
Abstract: The models developed in the first part of this study are applied to predict the removal of 4-nitrophenol by powdered activated carbon (PAC) in a bench-scale reactor. A series of continuous-flow filtration experiments were ...
PAC-Membrane Filtration Process. I: Model Development
Publisher: American Society of Civil Engineers
Abstract: Adsorption is modeled when powdered activated carbon (PAC) is applied in continuous-flow reactors followed by membrane filtration units operated without carbon wastage between backwash events. Four reactor configurations ...
Inactivation of <i>Cryptosporidium</i> Oocysts in a Pilot-Scale Ozone Bubble-Diffuser Contactor. II: Model Validation and Application
Publisher: American Society of Civil Engineers
Abstract: The axial dispersion reactor (ADR) model developed in Part I of this study was successfully validated with experimental data obtained for the inactivation of