You want to know how new remediation technologies work and which ones will get your projects across the finish line to meet your remediation goals. Pathways will help you get there.
This issue focuses on in situ remediation technologies including thermal treatment, plus the latest industry remediation news and events to keep you in the loop.
Early in the morning of September 28, 1982, nearly 40 train cars derailed near Livingston, LA. That fire burned for nearly two weeks as hazardous chemicals, seeped into the ground. The derailment forced more than 3,000 residents out of town for weeks and even months. Similar to the recent incident in East Palestine, OH, an array of cancerous chemicals including DNAPL and chlorinated solvents spilled into the surrounding environment.
After 30 years of pump and treat, PCE DNAPL still remained. Due to the high continued cost of pump and treat and no end in sight, responsible parties turned to an alternative source zone solution - SourceKill. SourceKill is an emulsified zero valent iron for chlorinated solvent source remediation. It is manufactured exclusively for Cascade by TEA, Inc., the first licensee of this NASA patent for DNAPL remediation at Cape Canaveral. SourceKill uses chemical reduction to primarily target known or suspected DNAPL source zones.
See Lessons from Louisiana: Livingston's long road to recovery - WFMJ.com
Results: NFA issued in 2016 and $5 million in settlement money saved with SourceKill was used to invest back into the community.
For more information on SourceKill chemistry and how it could apply to your DNAPL sites, please contact Eliot Cooper at [email protected].
How do you manage back pressure buildup in the borehole during injection to keep the project on schedule?
A pressure gauge is installed on the injection tool string manifold to indicate any back pressure that will have to be vented or subside before the rods can be added for top-down injection or removed during bottom-up injection. However, this can add significant time to the project while waiting for pressure to subside, or the venting loses a lot of the amendment already injected.
A second option is to use a check valve above the injection tool that lets amendment flow through the valve but seals with back pressure once injection is stopped. This prevents any pressure buildup above the check valve so injection tools can be added or removed. The only downside to this approach is that once the borehole is complete, it is not possible to determine any back pressure build-up below the check valve, and when the rods are fully extracted to the surface, any back pressure will force injected amendments up the borehole.
Multiple injection tool strings are often required so that injection at new locations can commence while pressure at the injection location subsides.
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March 29 – March 31, 2023
Remediation Expert Eliot Cooper will participate in a panel called “In-situ Remediation RD/RA Case Studies” where he will discuss “The transition to colloidal from micro-scale solids with further optimization through fully automated injection systems”.
Thermal Expert Steffen Griepke will be participating in a panel discussion called Thermal Remediation Case Studies and present a case study called “Challenges Encountered during the Implementation of the World’s Largest Jet Fuel Steam Remediation”.
May 8 – May 9, 2023
Cascade will be exhibiting and participating in a Panel Discussion on Geo-chemical in situ remediation. Come and meet us at booth #317.
