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MICHIGAN SOIL VAPOR EXTRACTION REMEDIATION (MISER) MODEL: A COMPUTER PROGRAM TO MODEL SOIL VAPORT EXTRACTION AND BIOVENTING OF ORGANIC MATERIALS IN UNSATURATED GEOLOGICAL MATERIAL
Abriola, L. M., J. Lang, AND K. Rathfelder. MICHIGAN SOIL VAPOR EXTRACTION REMEDIATION (MISER) MODEL: A COMPUTER PROGRAM TO MODEL SOIL VAPORT EXTRACTION AND BIOVENTING OF ORGANIC MATERIALS IN UNSATURATED GEOLOGICAL MATERIAL. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-97/099 (NTIS 98-115355), 1997.
This report describes the formulation, numerical development, and use of a multiphase, multicomponent, biodegradation model designed to simulate physical, chemical, and biological interactions occurring primarily in field scale soil vapor extraction (SVE) and bioventing (BV) systems. The model is entitled the Michigan Soil Vapor Extraction Remediation Model, or MISER. MISER solves the governing flow and transport equations in two space dimensions - either a cross sectional x-z domain, or an axisymmetrical r-z domain for simulating radial flow to a single well. A standard Galerkin finite element approach with linear triangular elements is employed. The coupled nonlinear equations are solved using a modular, set-iterative solution algorithm. In this approach the sets of flow, transport, and biodegradation equations are decoupled within the simulator and solved separately. The set-iterative approach substantially reduces the size of solution matrices and provides increased flexibility. Features of the model include: the ability to simulate multiphase flow, including water table coning; the simulation of multicomponent transport processes, incorporating fate-limited interphase exchange in processes of volatilization and dissolution of an entrapped organic liquid, interphase exchange between the mobile gas and aqueous phases, sorption, and biophase update; and the simulation of multicomponent biodegradation kinetics and microbial population dynamics. This report is divided into 6 sections. Section 1 provides an overview of SVE and BV systems and a review of existing models. Section 2 presents the conceptual formulation of MISER and the associated mathematical representation for flow, transport and biotransformation processes. Section 3 describes the numerical solution approach and Section 4 presents the results of model verification analyses. Description and usage of the model is provided in Section 5, and example SVE and BV simulations are described in Section 6. This report was submitted in fulfillment of CR-822017 by the University of Michigan under the partial sponsorship of the U.S. Environmental Protection Agency. This report covers a period from September 1993 to March 1996 and work was completed as of March 1996.
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