High-Energy Injection of Permeable Reactive Transects for Treatment of Hexavalent Chromium in Varied Geology
Derek Pizarro, CPG, Senior Product Manager, AST Environmental, Inc.
We successfully demonstrated a new method to install a viscous slurry at varying depths and heterogeneous geology without the use of soil mixing or hydraulic fracturing, as a continuing step in the overall treatment of hexavalent chromium in groundwater and soil at a confidential site. The selection of this type of amendment was preferred for this phase of the project when compared to other alternatives, such as excavation and direct mixing, pump-and-treat systems, or less reactive (aqueous) injectate alternatives. The injectate was installed in multiple transects to form passive zones which allow site groundwater to flow through and react with the injectate, reducing hexavalent chromium to trivalent chromium, and makes performance monitoring simple using existing monitoring wells and transect zone-specific piezometers. This application is a contemporary modification to more conventional permeable reactive barrier (PRB) application.
Derek Pizarro, CPG is a Senior Product Manager for AST Environmental, Inc. in West Chester, Pennsylvania. Derek is a Certified Professional Geologist and has 18 years of experience in environmental applications, specifically bedrock contaminant characterization; contaminant transport studies; heavy metals remediation; permeable reactive barrier (PRB) design; and reagent bench-scale testing and design for environmental sites and industrial and utilities clients. Previously, Derek served as General Manager and Environmental Products Director for a performance chemical manufacturer in King of Prussia, Pennsylvania, developing chemistries for treatment of inorganic contaminants, sediment applications, and injectates for use in PRBs. He is responsible for creating a novel product used in the remediation of dredged sediments impacted with late-transition and post-transition heavy metals, making them directly suitable for non-hazardous landfilling or onsite disposal. Derek received a Bachelor of Science in Geology and Environmental Geosciences and a Bachelor of Arts in History from Lafayette College in 2004. His career started with a bedrock field services company before moving to an ENR Top 100 Environmental Design Firm. Derek is a former American Foundry Society (AFS)- Environmental Health & Safety (EHS) committee member, and heavy metals task force advisor to a private utility group.