Optimization of Soil Vapor Extraction System Design

by Yung-Hsin Sun,
William W-G. Yeh, (F.ASCE),



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract:

Soil vapor extraction is a cost-effective technique for the removal of volatile organic compounds (VOCs) immobilized in the unsaturated zone. The design of a soil vapor extraction system (SVES) requires the determination of the number and locations of extraction wells, and corresponding extraction rates. In this study, SVES design is decomposed into location optimization and schedule optimization. Well locations are selected in location optimization, and schedule optimization is embedded in location optimization in order to provide a competitive extraction schedule for any given system configuration. A combinatorial optimization method, two-change local search, is proposed for both location and schedule optimizations. Based on the results of case studies, it is concluded that the proposed method is flexible and effective in accommodating different characteristics of location optimization and schedule optimization by its user-defined search rules.

Subject Headings: Optimization models | Soil pollution | Soil gas | Volatile organic compounds | Unsaturated soils | Soil treatment | Case studies

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