Cost-effective Approaches using Colloidal Zero Valent Iron for In Situ Groundwater Remediation

First broadcast: June 19, 2018

Speakers: John Freim, Ph.D., REGENESIS Director of Material Science

Recording Available| In this webinar we are pleased to have a special presentation from John Freim, Ph.D., REGENESIS Director of Materials Science. In his presentation, Dr. Freim discusses the benefits of using zero valent iron (ZVI) as a powerful remediation amendment that can decontaminate soil and groundwater containing chlorinated hydrocarbons, pesticides, and other toxic substances. Successful in situ remediation is predicated on using amendments offering a perfect combination of reactivity, the ability to distribute uniformly, and persistence.
The webinar addresses how:

• Colloidal ZVI provides high surface areas with enhanced reaction kinetics while also promoting reaction pathways with chlorinated hydrocarbons that can bypass the formation of toxic daughter products.
• Colloidal ZVI promotes stable aqueous suspensions with small particles and can fit within and pass through interconnected pore volume of sandy soils and similar environments. Compared to sub-micrometer ZVI products such as nanocrystalline zero valent iron (NZVI), 2 micrometer particles persist for longer timeframes.
• Colloidal ZVI particles are compatible with and can be co-applied with other amendments including colloidal carbon suspensions and most organic hydrogen donors.
• Recent research suggests that sulfidated iron can promote accelerated reactivity with chlorinated ethenes and ethanes.