H45 Emulsified Vegetable Oil Substrate (EVOS)™

EVOS™  is a patented, engineered product for the reductive dechlorination of chlorinated solvents (e.g., PCE, TCE, cis-DCE, TCA, and 1,2 DCA) or any anaerobically degradable substance (perchlorate, TNT, RDX, etc.).  The substrate package is a low viscosity liquid that contains a combination of slow and fast release electron donors and required nutrients.  Its viscosity is similar to that of milk which translates into a significantly larger dispersion pattern.

One injection will typically enhance biological activity for 3 to 5 years. The composition of EVOS™ is as follows:

  • H60EVOS Oil Content = 60%
  • H45EVOS Oil Content = 45%
  • % Fatty Acids = 0%
  • % Lactic Acid = 4% Sodium Lactate Solution
  • % Food Additive/ Emulsifiers/ Preservatives = 10%
  • Specific Gravity = 0.95-0.98 g/mL
  • pH = 6-8
  • Shelf Life Unrefrigerated = 30 – 60 days

As a result of its low viscosity and longevity, (EVOS)™ is an ideal substrate for injection using direct-push technology.  The low viscosity allows a greater volume of EVOSTM to be applied in a shorter period of time and increases the substrate delivery radius per point. This results in fewer injection points and overall shorter delivery time requirements per site.  It can also be injected into the subsurface through injection wells.

EVOS™ is designed to release bio-available hydrogen over a period of 3 to 5 years thus enhancing the long-term anaerobic biodegradation of the chlorinated solvents.  EVOS™ optimizes the naturally occurring biodegradation system by supplying the rate limiting factor (in this case hydrogen) in the degradation of VOC’s, certain pesticides/herbicides and immobilization of certain metals (Cr and As). 

EVOS™ is available in three distinct particle sizes and with a variety of vitamin supplements. Our product is available as a 60% Oil and a 40% Oil.

Key Benefits of EVOS™

Degrades PCE and TCE to non-toxic end products - EVOS™ provides an environmentally acceptable environment for the bacteria to rapidly and completely dechlorinate PCE and TCE to non-toxic end products such as ethene or ethane. 

Low cost - The passive nature of the EVOS™ Technology eliminates the large capital and operations/maintenance costs associated with active engineered systems such as pump and treat, air sparging with vapor extraction and continuous recirculation systems.  Savings can be as high as 90% when compared to a pump and treat system on a net present cost basis.  At a number of sites, EVOS™ will be less expensive than Monitored Natural Attenuation (MNA).

Slow release eliminates continuous substrate additions- Since the EVOS™ material degrades over a long period of time, EVOS™ significantly reduces O&M costs compared to the repeated or continuous injections required for soluble substrates such as lactate or molasses.

Non-toxic food grade materials - EVOS™ is made with food grade materials that have Generally Recognized As Safe (GRAS) status.  It can be injected directly into the aquifer through push-points or fixed wells.

Cuts off plume migration - EVOS™ can be applied in a barrier configuration to avoid further plume migration. 

Optimizes dechlorination activity - By maintaining a constant source of electron donors within the contaminated aquifer, EVOS™ can optimize dechlorination activity.

Packaging Options

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





Just-In-Time Manufacturing and Shipping

Unlike other substrate suppliers, Hepure does not sub-contract its manufacturing.  This allows us to setup “Just-In-Time” manufacturing and delivery of our EVOS™ products. Although we typically setup formal delivery schedules we work closely with the on-site project managers to produce and deliver EVOS™ based on real-time site conditions.