A Multi-Tracer Push-Pull Diagnostic Test for Assessing the Contributions of Volatilization and Biodegradation During In Situ Air Sparging
Abstract
This paper describes the development and application of a diagnostic tool for local measurements of mass transfer during operation of an IAS system. The diagnostic test involves injecting a solution containing multile tracer compounds through a monitoring well, piezometer, or drive point into the target treatment zone. The injected solution is initially deoxygenated and can contain: (a) a non-degradable, non-volatile conservative tracer, (b) one or more non-degradable, volatile chemicals, and (c) a biologically degradable, non-volatile compound. After a predetermined hold time, an excess quantity of groundwater is extracted from the same injection point and then changes in the concentrations of the tracer compounds are measured. Volatilization and oxygen consumption rates are then estimated from mass balances on the tracer components. This approach is different from other IAS monitoring options in that the measurements can be made without requiring pre-IAS data and results and can be obtained relatively quickly. Furthermore, in principle, the approach is capable of assessing both the rate of oxygen transfer to the aquifer and the rate of volatilization from the aquifer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2001
- Accession Number
- ADA406046
Entities
People
- Cristin L. Bruce
- Illa L. Amerson-treat
- Paul C. Johnson
- Richard L. Johnson
Organizations
- Battelle Memorial Institute