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Air sparging tracer test to investigate the flow path
1Department of Mineral and Petroleum Engineering, National Cheng Kung University, Tainan, Taiwan.
Summary
This study introduces a combined tracer and modeling method to map air flow paths and determine the radius of influence for air sparging systems. This aids in optimizing well spacing for effective soil remediation.
Area of Science:
- Environmental Engineering
- Hydrogeology
- Geochemistry
Background:
- Air sparging is a remediation technology used to treat contaminated groundwater.
- Effective design of air sparging systems requires understanding air flow paths and radius of influence.
- Current methods for evaluating these parameters can be complex and time-consuming.
Purpose of the Study:
- To present a novel method combining tracer tests and numerical modeling to investigate air flow dynamics in air sparging systems.
- To estimate the radius of influence (ROI) of air sparging wells.
- To provide a tool for optimizing the design of well spacing in air sparging applications.
Main Methods:
- A field tracer test using helium was conducted at an air sparging pilot site.
- A 3-dimensional, 3-phase compositional model was developed to simulate the air sparging process.
- The model was calibrated using tracer concentration data collected during the field test.
- The calibrated model was used to predict air flow paths and simulate water saturation distributions.
Main Results:
- The tracer test provided real-world data for model calibration.
- The calibrated model successfully predicted air flow paths within the aquifer.
- Simulated steady-state water saturation distributions proved valuable for estimating the radius of influence.
- The method demonstrated utility in guiding the design of sparging well spacing.
Conclusions:
- The integrated tracer and modeling approach offers a robust method for characterizing air sparging performance.
- Accurate estimation of the radius of influence is achievable through this technique.
- The findings support improved design and efficiency of air sparging remediation strategies.
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