Cascade's Quarterly Newsletter

Pathways Newsletter

Welcome to Pathways, your quarterly newsletter!

Tackling tough environmental challenges requires innovative solutions. This issue explores how advanced technologies are transforming remediation. A new formulation, sulfidated Colloidal iZVI is introduced. Discover how our team conquered contaminated bedrock beneath active buildings and learn about the power of automation in optimizing remediation processes.

Site of Former Dry Cleaners with Pneumatic Enhancement of Bedrock for Successful Cascade Chemistries Amendment Injection

Imagine a former dry cleaner site with contaminated bedrock lurking beneath active buildings. The target treatment zone was a challenging one, nestled both near and under existing structures. Our first step was to conduct a thorough structural analysis to ensure safety. With a green light, we drilled multiple injection points and employed pneumatic enhancement using nitrogen gas to optimize subsurface conditions.

To ensure fast and efficient delivery our custom-built bulk mixing trailer was used. This equipment can handle up to 400 gallons of Colloidal iZVI^TM per batch, which we injected into the target zone at 20 feet. Each three-foot interval received 350 gallons of ZVI injectate.

The results? Effective distribution of the Colloidal iZVI was demonstrated with commensurate CVOC reductions. Pre- and post-groundwater monitoring results have shown a direct correlation between total dissolved iron concentrations in wells and CVOC reduction.

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Site of Former Dry Cleaners with Pneumatic Enhancement of Bedrock for Successful Cascade Chemistries Amendment Injection

Ask the Expert

In a recent interview with the Environmental Business Journal, we answered a question about the impact of automation on remediation processes.

What role does automation play in your current remediation processes?

The response from our experts, John McAssey, Technical Expert, and John LaChance, VP of Development at TerraTherm, sheds light on the transformative power of this technology.

John McAssey emphasizes the importance of automation in enhancing the precision and efficiency of liquid and colloidal solids injection, especially for PFAS with 4 ng/l MCLs. He highlights the fully automated in situ injection technology, Pathfinder, which eliminates the contact shortcomings of traditional injection technologies that haven’t changed in the last 20 years, and provided more effective distribution and documentation of performance.

John LaChance highlights the extensive use of automation in thermal remediation, particularly through the SCADA system. This technology provides real-time monitoring, automated control, and valuable insights into the remediation process. Utilizing this technology adds cost savings and remote monitoring capabilities enabled by automation.

Want to learn more about how automation is shaping the future of remediation? Download the full article and head to page 31 for more on the connection between automation and remediation.

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Environmental Business Journal, Volume 37 Numbers 5/6: Q3 2024: Remediation & PFAS Market Report

New Colloidal iZVI Formulation - Sulfidation

While our excellent remediation performance with our Colloidal iZVI has been well documented, our clients now have the option of including sodium dithionite in our iZVI mix which will create reactive sulfides that will also reduce solvents. It's a well-known phenomenon described in detail in the literature see “Sulﬁdation of Iron-Based Materials: A Review of Processes and implications for Water Treatment and Remediation,” Environmental Science and Technology, 2017)."

Iron-based materials used in water treatment and Groundwater remediation, especially micro-sized zero-valent iron can be more eﬀective when modiﬁed with lower-valent forms of sulfur (i.e., sulfidation).

An analysis of available kinetic data for dechlorination under anoxic conditions shows that sulﬁdation usually increases dechlorination rates, and simultaneously hydrogen production is suppressed. Therefore, sulﬁdation can greatly improve the eﬃciency of the utilization of reducing equivalents for contaminant removal.

Get in touch with our experts to discuss this new offering.

Talk to an Expert

New Colloidal iZVI Formulation - Sulfidation

PFAS in the News

Technology Spotlight: Cost-Effective Groundwater Remediation with ColloidalChem™

Traditional remediation methods like In Situ Chemical Oxidation (ISCO), In Situ Chemical Reduction (ISCR), and In Situ Bioremediation (ISB) often struggle to meet stringent Maximum Contaminant Levels (MCLs) for solvents, petroleum, and emerging contaminants like PFAS. Pump-and-treat systems, while widely used, are notorious for their high costs, lengthy treatment times, and intensive energy consumption.

ColloidalChem technology offers a revolutionary approach to groundwater remediation. This innovative solution leverages the power of colloidal activated carbon to effectively address a wide range of contaminants, including PFAS, chlorinated solvents, BTEX, petroleum, and metals. Unlike traditional methods, ColloidalChem can be injected directly into the subsurface, minimizing disruption and reducing costs.

Stop by to see us at the following events:

Association of Environmental & Engineering Geologists Annual Meeting, 09.10 – 09.14, Philadelphia, PA
2024 California Land Recycling Conference, 09.17 – 09.19, Carson, CA
Association of State Dam Safety Officials – Dam Safety 2024, 09.23 – 09.26, Denver, CO
2024 Western Groundwater Congress, 10.07 – 10.09, Olympic Valley, CA
RemTec, 10.15 – 10.17, Westminster, CO
MGP Conference 2024, 10.17 – 10.18, Atlanta, GA
AEHS East Coast Conference, 10.21 – 10.24, Amherst, MA

Tell Us

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