Use of 3D-numerical models for SVE design
Conference
·
OSTI ID:96680
- ICF Kaiser Engineers, Oakland, CA (United States); and others
The design of soil-vapor extraction (SVE) systems for remediation has generally been based on the use of analytical solutions, which are limited be restrictive assumptions. These solutions are generally one-dimensional, and applicable only for radial flow to a single well. Many SVE remediation efforts are concerned with relatively thin vadose zones, where groundwater occurs at shallow depths. In such cases, the restrictive assumptions involved with analytical solutions are sometimes acceptable, unlike cases where multi-vent SVE systems are required. For the case of a large vent field, the pressure/flow distribution in the vent field can best be adequately determined through numerical modeling. In addition, thick, multi-layered vadose zones, with heterogeneously distributed recent contaminants generally precludes the use of simplified analytical or numerical techniques. With the development of sophisticated PC-based numerical models for fluid flow and transport, it has become practical to use 3D numerical models to aid in the design of SVE systems. This paper discusses numerical flow and mass transport modeling performed for the design of a large, complex soil vapor extraction system in California. The main objectives of the modeling effort can be summarized as follows. Simulate the pressure and flow distributions for each proposed vent layout design. This information is needed to evaluate relative effectiveness. Provide estimates of mass removal rates and cleanup times. Simulate various operating modes/chronologies to assure compliance with design requirements. Aid in the placement of optimum vent locations and screen intervals.
- OSTI ID:
- 96680
- Report Number(s):
- CONF-9504134--
- Country of Publication:
- United States
- Language:
- English
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