EDS-ER™

Electron Donor Solution – Extended Release
   Safety Data Sheet (SDS) 

Product Overview

EDS-ER™ (Electron Donor Solution – Extended Release) is a long-lasting source of carbon and hydrogen designed to support enhanced reductive dechlorination and other anaerobic bioremediation processes. It provides a fermentable substrate that promotes sustained reducing conditions and long-term electron donor availability in groundwater treatment zones.

When mixed with water, EDS-ER™ spontaneously forms a high-quality emulsified vegetable oil (EVO), enabling uniform distribution throughout the aquifer. Unlike many commercially available EVO products, EDS-ER™ is shipped without water, ensuring that 100 percent of the product delivered to site functions as an active fermentable substrate.

Technical Basis

Extended-Release Electron Donor Performance

EDS-ER™ is formulated to ferment slowly, providing a sustained supply of hydrogen over extended timeframes. Hydrogen generated during fermentation serves as the primary electron donor for organohalide-respiring bacteria responsible for reductive dechlorination of chlorinated volatile organic compounds (CVOCs).

This extended-release behavior allows EDS-ER™ to support anaerobic treatment conditions for multiple years following injection, reducing the frequency of reinjection events compared to rapidly fermenting substrates.

Spontaneous Emulsification and Aquifer Distribution

Upon contact with water, EDS-ER™ spontaneously forms a stable, low-droplet-size oil-in-water emulsion. This property enables efficient mixing, simplified field operations, and improved subsurface distribution without the need for pre-manufactured emulsions or onsite blending of water-laden products.

Applications

EDS-ER™ is used as a primary electron donor substrate for anaerobic remediation.

Typical applications include:

• Enhanced reductive dechlorination of CVOCs
• Establishment and maintenance of anaerobic aquifer conditions
• Long-term electron donor supply in source and plume areas

• Support of biological treatment processes requiring sustained hydrogen production

The product may be injected via existing wells or direct-push methods, depending on site conditions and treatment objectives.

Integration with Tersus Technologies

EDS-ER™ is the emulsified oil substrate component of EDS-Advanced™, Tersus’ patented catalyzed reductive bioremediation platform (U.S. Patent No. 11,577,231 B2).

Within the EDS-Advanced™ system, remediation is achieved through the coordinated injection of:

• EDS-ER™ as the extended-release electron donor substrate
• EDS-Substrate Shuttle™ as the alcohol-based cosolvent and conditioning agent
• EDS-Activator™ as the proprietary catalyst promoting fatty acid release

When used together, these components improve amendment distribution, enhance substrate bioavailability, mitigate biofouling, and support efficient and sustained reductive dechlorination. EDS-ER™ provides the long-term electron donor foundation upon which the EDS-Advanced™ process operates.

Features & Benefits

Features

• Spontaneously forms a high-quality oil-in-water emulsion
• Easily mixes with water, simplifying field operations
• Compatible with well injection and direct-push delivery
• Slowly fermenting for extended electron donor release
• Contains refined, bleached, and deodorized (RBD) food-grade soybean oil
• Preservative-free formulation

• Shelf life exceeding two years

Benefits

• Provides electron donor availability for up to five years
• Improves amendment distribution and treatment longevity
• Reduces injection frequency and long-term operating costs
• Lower transportation costs compared to water-laden EVO products
• Up to 50 percent reduction in packaging material
• Reduced carbon footprint relative to conventional EVO formulations

• USDA Certified Biobased Product

Typical Application

EDS-ER™ is diluted with water at the surface and injected into the subsurface according to the approved work plan. The product emulsifies upon mixing, disperses within the aquifer, and ferments gradually to sustain anaerobic conditions and hydrogen availability over extended periods.

Application rates, dilution ratios, and injection spacing are site-specific and determined based on contaminant mass, hydrogeology, and remedial objectives.

Physical Characteristics

At room temperature, EDS-ER™ is a liquid with appearance, viscosity, and cloud  point similar to vegetable oil. Unlike many EVO products  require preservatives, EDS-ER™ remains stable without additives and resists spoilage during storage.

Refer to  Safety Data Sheet for complete compositional, handling, and hazard information. 

Transportation

EDS-ER™ is classified as non-hazardous for transportation under U.S. DOT regulations when shipped as supplied. Refer to SDS for additional shipping classification and handling requirements.

Packaging

EDS-ER™ is available for shipping in either 55-gallon poly drums or 275-gallon IBC containers, providing flexibility in packaging options to meet your needs.