For every zone of your plume, we’ve got you covered!

Leaders in Remediation of Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)

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- Enhances Efficiency

- Minimizes Methane Production

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Electron Donor

Solutions for


Reductive Dechlorination

Formulating Surfactant Blends

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Additive injection and groundwater recirculation trailers available for short or long term lease.

TersOx™ - Inorganic Peroxygen for Enhanced Aerobic Bioremediation

RemBind designed to treat TPH, PAH, PFOS, PCBs, PCPs, and various pesticides

Sulfate Enhanced Bioremediation 

Advancing the Science of Enhanced Reductive Dechlorination

Electron Donor Solution – Extended Release

As delivered, the physical state of EDS-ER™ (electron donor solution – extended release) by Tersus Environmental is significantly different than standard emulsified vegetable oil (EVO) products. Whereas other EVO products are concentrated emulsions containing water, EDS-ER™ is a water-mixable oil; it contains no water. Thus, the costs for shipping EDS-ER™ are about 50% less than conventional products.

At room temperature, EDS-ER™ is a liquid material with an appearance and viscosity roughly equivalent to vegetable oil.  Unlike common EVO products, EDS-ER™ will not separate, will not freeze, and has a shelf life of 2 years without spoilage.

Tersus Environmental is proud to announce that EDS-ER™ does NOT contain ethoxylated polysorbate surfactants.  As you may know, many environmental remediation injectates, such as emulsified vegetable oils use biodegradable non-ionic surfactants. Unfortunately, ethoxylation, the manufacturing process that creates these surfactants (e.g., polysorbates) often results in these products containing 1,4-dioxane.

 EDS ERMixing


EDS-ER™ is a simple, safe, low-cost solution for the bioremediation of halogenated compounds (e.g., PCE, TCE, DCE, VC, TCA, CT, etc.), nitrates, perchlorate, energetics, and select immobilization of oxidized heavy metals.


  • 100% fermentable and contains no water
  • Because the product is completely water mixable, the number of necessary injection points for low permeability structures decreases
  • Easily mixes with water, simplifying field operations
  • Controlled release of electron donors for up to five years
  • Food-grade carbon source
  • Low total dissolved solids to comply with secondary water quality requirements for amendments with low salt content
  • Conforms to EPA's EPP (Environmentally Preferable Purchasing) and USDA biobased criteria
  • Neutral pH when mixed with water
  • Clean, low-cost, non-disruptive application (e.g., direct-push, wells and excavations)
  • Lowers transportation costs when compared to other electron donors
  • Over two years shelf life
  • Freezing Point is -4 °F (-20 °C)

Field Application Design

EDS-ER™ applications are easily tailored to meet site-specific conditions. Typical configurations consist of grid and barrier patterns and application in excavations or trenches.  The product’s low viscosity allows subsurface distribution through direct-push injection points, hollow-stem augers or pumped through existing wells.


  • 55-gallon poly drums
  • 275-gallon IBC containers
  • 3,000 - 5,000 gallon tankers

 EDS ER injection2

Chemical & Physical Properties




Typical Value

Organic Carbon (% by wt.)   100
Refined and Bleached US Soybean Oil (% by wt.)   93 
Slow Release Organics, food grade vegetable oil derived  fatty acid esters (% by wt.)   7
Specific Gravity   0.92 to 0.93