Soil and Groundwater Remediation
MetaFix® Reagent webinars
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.
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In-situ remediation of soil and groundwater contaminated with divalent heavy metals can be achieved by precipitating these metals as sulfides, carbonates, or hydroxides. Each method differs in cost, solubility, and long‑term stability. This presentation compares the main treatment approaches and evaluates their effectiveness for removing dissolved cadmium, cobalt, copper, lead, mercury, nickel, and zinc. It reviews the mechanisms that convert soluble metals into less soluble forms when treated with sulfide/iron sulfide, carbonate, or hydroxide reagents, highlighting key factors such as solubility, pH stability, and mineralogy. The webinar also discusses how soil and groundwater conditions—such as organic carbon, sulfate levels, pH, and redox status—influence remediation performance. Two in-situ groundwater projects demonstrating successful removal of dissolved cadmium, copper, lead, nickel, and zinc will be presented. |
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Dr. Alan Seech, a principal technology officer at Evonik, is studying, comparing, and contrasting the effectiveness of common treatment approaches for metals, metalloids, and chlorinated organic compounds, taking into account their chemical properties and site conditions. Remediation of soils and groundwater contaminated with metals and metalloids is challenging due to the high number of affected sites, estimated at more than 2,000 in the United States and Europe. The author will briefly discuss the mechanisms for removing dissolved arsenic, hexavalent chromium, and divalent heavy metals, with a focus on the solubility and pH stability of the products formed. |
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Dr. Alan Seech explains how Evonik reagents can be used to remediate vadose zone soils more economically and more sustainably than the dig & dump approach. In the video, we review treatment chemistry and microbiology, present findings from bench-scale testing and full-scale projects, and introduce case studies including:
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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. |
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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. |
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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. |