Accurate data routinely collected can be the difference between a successfully completed thermal remediation project, and one with extended operations, costing the client money. TerraTherm designs and executes a reliable data collection process during In Situ Thermal Remediation (ISTR) projects that specifically targets key operational data, therefore enhancing system performance, reducing energy consumption, and documenting when project goals are met.
Depending on the complexity of a site and the specific remedial objectives, any number of data analyses can be performed, but the quantity and quality of data are paramount. The data are used to create detailed mass and energy balances that ultimately enable an analysis of what is often the client’s greatest concern: the energy input versus the contaminant mass output. At first glance, analysis of input vs. output seems straightforward, but the wellfield should be considered a constantly changing entity with many characteristics, which when monitored properly, can be predicted, manipulated and optimized to accomplish the treatment goals.
To maintain the highest mass removal while consuming the least amount of energy, key operational characteristics are investigated. A few major characteristics include:
- Subsurface temperatures and mass removal rate – by monitoring the subsurface temperature we can predict when the peak mass removal will happen and when it will end.
- Vapor extraction vacuum, flows and temperatures – instruments installed in vital locations allow the operators and engineers to maintain pneumatic control and capture of the vapors including steam generated during the subsurface heating.
- Energy – monitoring the energy injected into the subsurface and calculating the energy coming out in the different phases allow the operators and engineers to optimize the heat in the subsurface.
Using data from TerraTherm’s recently completed (December 2013) site in Teterboro, NJ, the poster below, presented at the 2014 AEHS East Coast Conference at UMass, Amherst, MA focuses on how TerraTherm applies operational data to obtain accurate, quality information and meet remediation goals. The poster explains the challenges with data management, and how TerraTherm handles data, with examples pulled from the Teterboro site, the largest In Situ Thermal Desorption project ever completed. Click on the poster to enlarge it!