Innovative Sustainable Green Technologies

Tersus Environmental offers a comprehensive suite of training opportunities to boost your know how, benefit your bottom line, and serve your clients better. Learn something new by attending one of our complimentary webinars. People who really know in situ remediation and are eager to share their knowledge with you teach all webinars.

Oxygen transport is the major limiting factor for the success of aerobic bioremediation.  In the 1980s the bioremediation industry focused on recirculation of groundwater and amending it with hydrogen peroxide. As concerns mounted about safety, the toxicity of peroxide and fouling of injection wells, consideration was given to air sparging due to its volatilization and biodegradation component. In 1994, it was recognized that oxygen sparging can enhance oxygen delivery/solubilization rates (less interference from nitrogen gas dissolution) while minimizing volatilization of compounds in the sparged medium (so you don’t need SVE).

MicroBlower uses a small, low power vacuum blower to extract or inject gases into the subsurface for characterization or remediation.  While similar in design to an active soil vapor extraction (ASVE) blower, the MicroBlower is a low-cost alternative designed to run on renewable sources of energy such as solar and wind energy to treat volatile organic compound (VOC) contamination in the unsaturated zone.   MicroBlowers offer the advantage of a reduced carbon footprint and very low operating and maintenance expenses.

A growing trend in environmental remediation is the use of natural processes.   The MicroBlower technology is an example of such an approach, based on natural venting cycles between the surface and subsurface. When atmospheric pressure is higher than the subsurface’s pressure, air is induced to flow through wells into the subsurface. Conversely, when atmospheric pressure is lower than subsurface pressure, air flows out of wells into the atmosphere, taking with it organic contaminants such as chlorinated solvents in the gas phase.

Passive Gas infusion is technology that dissolves CO₂ into water under pressure for NAPL recovery. As the supersaturated liquid flows through the porous medium, gas evolution occurs in situ as the system returns to thermodynamic equilibrium.  Supersaturated Water Injection (SWI) offers the following benefits:

• LNAPL and DNAPL recovery enhancement system for trapped and immobile NAPL mass
• Uses carbon dioxide to strip volatile NAPL component for capture in the unsaturated zone
• Mobilizes liquid NAPL trapped in aquifer matrix for recovery

Documents outling the installation and set up of the iSOC® system. All inVentures information reprinted with permission from inVentures Technologies Incorporated (more at iSOC® info and gPRO® info).

Tersus Environmental offers the following guidance documents to assist our customers with the development of Remedial Action Plans.  All inVentures information reprinted with permission from inVentures Technologies Incorporated (more at iSOC® info and gPRO® info).