Webinars on all topics

In this webinar, Dr. Alan Seech explains how Evonik reagents can be used to remediate soils in the vadose zone more economically and sustainably than with the “Dig & Dump” approach. In the video, we discuss treatment chemistry and microbiology, present results from bench-scale testing and full-scale projects, and share case studies including:

• In situ chemical reduction (ISCR) with DARAMEND® Reagent
• Aerobic bioremediation with TERRAMEND® Reagent
• Removal of leachable heavy metals with METAFIX® Reagent

Evonik Senior Technology Application Manager Dr. Alan Leech will review, compare, and contrast the effectiveness of common treatment approaches for metals, metalloids, and chlorinated organics as influenced by their chemistry and site conditions. Remediation of soil and groundwater contaminated with metals and metalloids is a significant challenge. The number of impacted sites is substantial, estimated at more than 2,000 in the United States and Europe. Dr. Seech will briefly review the removal mechanisms for dissolved arsenic, hexavalent chromium, and divalent heavy metals with emphasis on the solubility and pH range stability of the products formed. The influence of soil and groundwater variables such as pH, redox status, and native iron and sulfate concentrations will be addressed. Representative results from bench-scale treatability testing and full-scale case studies using sustainably produced reagents including METAFIX® and GEOFORM® will be presented and discussed.

This webinar outlines the physical, chemical and microbiological processes promoted by METAFIX® and EHC® Reagents and how they contribute to the removal of soluble heavy metals, with a focus on arsenic, chromium, lead and mercury. Treatment of heavy metals in soil and groundwater is based on their conversion from soluble to insoluble forms by promoting precipitation, co-precipitation and adsorption reactions. These reactions are mainly controlled by pH, Eh, sulfate/sulfide and ferrous/ferric chemistry, and the availability of metabolizable organic carbon.

Dr. Brant Smith will present the technical fundamentals of KLOZUR® CR and several successful case studies. KLOZUR® CR, or combination agent, is a mixture of KLOZUR® SP and PERMEOX® Ultra. This provides three potential remediation pathways from a single application, including hydrogen peroxide and alkaline activation of KLOZUR® SP, aerobic bioremediation and possible anaerobic oxidation using sulfate as an electron acceptor. The basic chemistry behind KLOZUR® CR will be discussed.

Brianna Desjardins and Brant Smith discuss the lab tests that our Environmental Solutions Laboratory typically performs for EHC® Reagent, ELS® Microemulsion, KLOZUR® persulfate, METAFIX® Reagent and hydrogen peroxide. Testing is a critical element to the successful implementation of remediation technologies and is used to develop design parameters, assess potential issues, ensure compliance with regulations, and demonstrate a conceptual approach prior to on-site deployment.

This webinar, presented by Dan Leigh, Evonik's remediation expert, will outline the basic steps to planning effective remediation projects.

For example, we will discuss whether to start with bench testing or move directly to pilot testing, as well as the data needs for determining how to move from pilot testing to full-scale remediation. Dan will also discuss the different biological, chemical and biogeochemical reduction reagents and how to determine which one is right for your site.