Provect-IR®

Antimethanogenic ISCR (In Situ Chemical Reduction) Reagent

Provect-IR is a unique mixture of reagents combined into a single product that optimizes the in-situ reductive dechlorination of chemicals present in soil, sediment, and groundwater. It acts by promoting synergistic interactions between:

  • Natural antimethanogenic compounds
  • Hydrophilic, nutrient rich organic carbon sources
  • Zero-Valent Iron (ZVI)
  • Chemical oxygen scavengers
  • Vitamin and mineral sources

This distinctive, patented combination of natural and food-grade chemicals promotes ISCR conditions for fast and effective destruction of targeted constituents of interest (COIs) such as chlorinated solvents, organochlorine pesticides, and other halogenated compounds. Notably, Provect-IR is the only ISCR reagent to simultaneously inhibit the production of methane during the requisite carbon fermentation processes. This promotes more efficient use of the hydrogen donor while avoiding negative issues associated with elevated methane (CH4) in groundwater, soil gas, and indoor air.

Current regulations for methane in groundwater vary from ca. 10 to 28 mg CH4/L (Indiana Department of Environmental Management, 2014). More State regulations are pending, with several ERD projects which intended to use liquid carbon (emulsified oils) sources failing to receive regulatory approval due to issues associated with excessive production of methane during previous technology applications (Personal Communication – State of California; State of Minnesota). Many remedial practitioners have subsequently been required to establish contingencies for conventional ERD/ISCR implementation in the event that methane exceeds a threshold level ranging from 1 ppm to 10 ppm groundwater. These contingencies often entail expensive and extensive systems for capturing and treating methane in soil gas/vapor captured via SVE systems.

POTENTIAL ADVANTAGES OF USING PROVECT-IR® ANTIMETHANOGENIC ISCR TECHNOLOGY

The distinctive combination of reagents promotes ISCR conditions for fast and effective destruction of targeted COIs while managing the production of methane during the requisite carbon fermentation processes.  This promotes more efficient use of the hydrogen donor while avoiding negative issues associated with elevated methane in groundwater, soil gas and indoor air (induced vapor migration, plume expansion, other potential health & safety issues).

  • More Efficient: Increased efficiency is the main benefit. Hydrogen yield calculations have shown that by minimizing waste of hydrogen by controlling excessive methanogenesis one can elicit the same response by using ca. 30% less organic amendment. Since it takes less time and resource to inject less amendment this can significantly lower overall project cost.
  • More Effective: ISCR reactions avoid accumulation of dead-end catabolic intermediates as a function of substrate addition (as is common with [emulsified] oils and sources of carbon only).
    • Does not rely on physical sorption/sequestration as a major “removal” mechanism (as is common with oils).
    • Inherently buffered for pH control – will not acidify an aquifer and liberate heavy metals as potential secondary COIs.
  • Safer: Fewer health and safety concerns as compared with use of traditional ERD or ISCR reagents; Avoid issues associated with new and emerging methane regulations.
  • Ease of Use: Green and sustainable. All components integrated in a single package. Logistics with no surprises. Provect-IR is easily and quickly injected using conventional construction technologies.
  • Longevity: Engineered profile of carbon sources for multi-year longevity estimated at 3 to 7 years based on site-specific hydrogeology; ZVI reactivity can persist >10 years.
  • Minimizes Rebound: Reagent will stay in place and remain active for an extended period of time which manages and prevents COI rebound.
  • Predictable Performance: More efficient use of hydrogen donors (does not get wasted as methane).
  • Simultaneous Immobilization of Heavy Metals: Will not mobilize or methylate arsenic or other heavy metals yielding secondary plumes (as is common with [emulsified] oils and sources of carbon only).  Can be formulated to manage environments that are co-impacted by various inorganic contaminants (g., As, [Hg], Ni, Pb, Zn) while simultaneously mineralizing the organic compounds.
  • Inherent Buffering: Presence of ZVI offers substantial pH buffering capacity
  • Range of Applicability: ISCR demonstrated effective on a wide range of COIs, including chlorinated / halogenated solvents, Freon, pesticides, perchlorate and other energetic compounds (explosives).
  • Supports Natural Attenuation: For all the reasons summarized above, Provect-IR enhances natural biological processes.
  • Patented Technology: Fully covered under numerous patents (7,129,388; 7,531,709; 7,828,974; 8,147,694; 9,221,669; 9,637,731; multiple patents pending) that indemnify you and your client from patent infringement.

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