Decontamination of Chlorinated and Volatile Compounds: Case Studies

Innovation and clean technology

- Case Studies: Overcoming Persistent Contaminant Rebound Using Adsorptive Technologies

In the past, Vertex has observed how injecting Activated Carbon (AC)-based amendments can be used to provide a quick, effective and sustained treatment for chlorinated solvents, hydrocarbons and other contaminants in a matter of weeks. Previously the use of AC in the subsurface was limited due to the finite adsorptive capacity of the AC emplaced. New technologies allow for both adsorption and subsequent treatment of organic contaminants using efficient modalities. Solvents are treated via the well known chemical reduction pathway. Hydrocarbons are treated via anaerobic biodegradation, which provides a more efficient and sustained treatment compared to aerobic biodegradation. As contaminants are degraded, adsorption sites on the AC once again become accessible to quickly adsorb more contamination from the groundwater, thus overcoming the “rebound” problem.

- Case Study: How to Avoid Failure in the Design and Installation of Permeable Reactive Barriers

This talk will showcase innovative and recent advances in the science and technology behind the design and installation of zero-valent iron permeable reactive barriers (PRB) using a real-world case study. Project components to be profiled include: • Data review and gap analysis for the site; • Bench-scale proof-of-concept treatability testing; • Preliminary full-scale design incorporating computer modeling and sensitivity analysis; • Physical profiling of the PRB alignment at the site using the in-situ Hydraulic Profiling Tool; • Updated and final detailed design for the full-scale PRB; • Installation of the “funnel and gate” RB using a biopolymer slurry for excavation support; • On-site QA/QC testing of the reactive media and emplacement methodology; and • Follow-up performance monitoring of treatment effectiveness.

- Presentation 3 (Coming soon)