Soil and Groundwater Remediation

MetaFix® and EHC® Reagents webinars

EHC® Reagent consists of controlled-release carbon, zero-valent iron (ZVI) particles, and nutrients used for in situ treatment of groundwater and saturated soils contaminated with heavy metals and persistent organic compounds such as chlorinated solvents, pesticides, and energy sources. In our webinars, we show you how EHC® works physically, chemically, and microbiologically after it is injected into the subsurface.

 

Our MetaFix® Reagents are customized formulations of reducing compounds, reactive minerals, mineral activators, catalysts, and pH modifiers for cost-effective treatment of heavy metals at even the most challenging sites. MetaFix® is capable of treating mixed heavy metals and chlorinated solvents. We will show you how after MetaFix® is incorporated, common heavy metals undergo reduction, adsorption, precipitation, and conversion to stable sulfide and iron sulfide precipitates. 

Topic

Description

Download

This webinar will describe the physical, chemical, and microbiological processes promoted by MetaFix® and EHC® Reagents and how they work to remove soluble heavy metals, with a focus on arsenic, chromium, lead, and mercury. Treatment of heavy metals in soils and groundwater is based on their conversion from soluble to insoluble forms by promoting precipitation, coprecipitation, and adsorption reactions. These reactions are controlled primarily by pH, Eh, sulfate/sulfide and ferrous/ferrous chemistry, and the availability of metabolizable organic carbon.

Dr. Alan Seech will provide an overview of heavy metal treatment theory and introduce MetaFix® Reagents. MetaFix® Reagents are site-specific formulations of ZVI, other reducing agents, reactive minerals, adsorbents, and pH modifiers. Treating soil or groundwater with MetaFix® results in the formation of stable sulfide and iron sulfide precipitates that have greater stability than conventional alkaline metal treatment methods.

Brianna Desjardins and Brant Smith discuss the lab-scale testing that our Environmental Solutions Laboratory typically performs for EHC® Reagent, ELS™ Microemulsion, Klozur® persulfate, MetaFix® Reagent, and hydrogen peroxide. Testing, a critical element to successful implementation of remediation technologies, is used to develop design parameters, evaluate potential issues, ensure regulatory compliance, and demonstrate a conceptual approach prior to field deployment.

The success of most in situ remediation strategies relies largely on the effective distribution of reagents in the subsurface. In this webinar, Josephine Molin reported on the validation of effective distribution in the subsurface in the context of EHC injection projects. She provided an overview of the various methods used to verify ROI and observations in different lithologies, as well as recommended injection equipment and approaches to limiting emergence during injection in challenging locations.