TranslateOur Technology Portfolio
Six core in situ technologies, often deployed in combination, to address any contaminant type at any depth.
In Situ Chemical Oxidation (ISCO)
Chemical oxidants are injected into the subsurface to rapidly destroy organic contaminants in place. IET's patented ferric iron-activated persulfate generates sulfate radicals that aggressively oxidize chlorinated solvents and petroleum hydrocarbons β providing sustained treatment lasting 2+ years and preventing concentration rebound.
- Patented ferric iron-activated persulfate (US-9427786-B2)
- Treats TCE, PCE, BTEX, creosote, PAHs
- Weeks to months for significant concentration reduction
- Bridges into secondary bioremediation phase
Enhanced Bioremediation
Stimulating or augmenting native microbial populations to biodegrade contaminants. IET uses electron donor substrates (emulsified vegetable oil, lactate), bioaugmentation cultures (KB-1, SDC-9), and patented encapsulated slow-release amendments to sustain treatment over 2β5 year timeframes.
- Patented encapsulated hydrogen donor substrates (US-9126244-B2)
- Bioaugmentation with dechlorinating cultures
- Anaerobic treatment of chlorinated solvents to ethene
- Methane inhibition technology (US-9221699-B2)
In Situ Chemical Reduction (ISCR)
Reductive chemical amendments β zero-valent iron, sodium dithionite, ferrous sulfate β are injected to create strongly reducing conditions that destroy chlorinated solvents and immobilize heavy metals including hexavalent chromium. Effective where oxidative approaches are unsuitable.
- Zero-valent iron (ZVI) and nano-ZVI delivery
- Chromium VI β Cr III reduction
- Abiotic TCE/PCE dechlorination
- Long-term sustained reducing conditions (5β10+ years)
Emulsified Zero-Valent Iron (EZVI)
EZVI is a nano-scale zero-valent iron emulsified in a biodegradable oil. The oil phase partitions into DNAPL, delivering iron directly to the contaminant source zone. This dual mechanism combines chemical reduction with biodegradation for highly effective DNAPL source treatment.
- Direct DNAPL source zone contact
- Combined abiotic + biotic degradation pathways
- Ideal for dry cleaner and industrial solvent sites
- NASA-licensed technology deployed nationally
In Situ Geochemical Stabilization (ISGS)
Mechanical soil mixing delivers chemical amendments directly into contaminated soil, achieving intimate contact regardless of soil heterogeneity. Used at MGP sites, creosote sites, and source zones where injection distribution would be inadequate.
- Excavator-mounted mixing with reagent delivery
- Permanganate, persulfate, or stabilizing agents
- Treats both saturated and unsaturated zones
- Avoids hazardous waste excavation & disposal
NAPL Treatment Approaches
Specialized multi-phase strategies for sites impacted by free-phase product. IET combines surfactant-enhanced recovery, in situ oxidation, and bioremediation to address both DNAPL and LNAPL source zones across a range of site types.
- DNAPL and LNAPL source zone treatment
- Surfactant/cosolvent flushing
- ISCO for residual NAPL oxidation
- Long-term MNA with monitored natural attenuation
Why IET's Technology Stands Apart
14 US Patents
IET holds 14 US patents covering ferric iron-activated persulfate, methane inhibition, encapsulated electron donors, and in situ delivery systems β translating directly to better field performance.
Patented + Proven
Unlike distributors, IET developed its own technologies and has deployed them on 2,000+ sites. We own the intellectual property and we do the work.
Combined Approach
Most IET projects layer multiple technologies β ISCO to destroy source zones, then bioremediation for the dissolvedplume β achieving faster cleanup at lower total cost than single-technology approaches.
Not Sure Which Technology Fits Your Site?
Use IET's free AI Site Assessment Tool to get a technology recommendation based on your contaminants, geology, and site conditions.
Combined & Sequential Remediation Approaches
For complex contamination challenges, IET routinely combines multiple technologies in sequence β achieving faster cleanup, lower total cost, and more durable results than any single-technology approach.
ISCO β Bioremediation
Apply ferric iron-activated persulfate to rapidly destroy DNAPL source zones, then transition the iron-amended subsurface into a bioremediation-supporting environment for dissolved plume polishing. IET's patented persulfate is specifically engineered for this sequential approach.
ISCR + Bioaugmentation
Zero-valent iron or sodium dithionite creates strongly reducing conditions for abiotic dechlorination of TCE/PCE, while bioaugmentation with Dehalococcoides cultures (KB-1, SDC-9) provides complete mineralization to ethene. Combined abiotic + biotic degradation.
Soil Mixing + ISCO
In low-permeability formations where injection distribution is limited, mechanical soil mixing delivers oxidants (persulfate, permanganate) directly throughout the treatment zone. Ensures intimate reagent-contaminant contact at MGP, creosote, and industrial sites.
Specialized Treatment Approaches
Beyond core ISCO and bioremediation, IET applies specialized in situ methods for challenging contaminants and site conditions.
In-Situ Chemical Fixation for Arsenic & Heavy Metals
IET provides in-situ chemical fixation services for arsenic, lead, and other dissolved metals. Ferrous iron co-precipitation, iron-amended reactive zones, and pH adjustment immobilize arsenic and metals directly in the aquifer β eliminating dissolved phase mobility without excavation. This approach is particularly effective at sites where arsenic is present alongside organic contaminants.
Enhanced In-Situ Dechlorination (EID) for Chlorinated Solvents
Enhanced in-situ dechlorination combines electron donor delivery (EVO, HRC, lactate) with targeted bioaugmentation to drive complete reductive dechlorination of PCE, TCE, and DCE to harmless ethene. IET's patented slow-release encapsulated substrates (US-9126244-B2) sustain reducing conditions for 2β5 years per injection event, minimizing site visits and mobilization costs.
Permeable Reactive Barriers (PRBs)
IET designs and installs permeable reactive barriers for long-term passive plume interception. PRBs filled with zero-valent iron (ZVI), activated carbon, or specialized reactive media intercept groundwater plumes and degrade or capture contaminants as they flow through. IET has installed PRBs for chlorinated solvents, metals, and mixed-contamination plumes at numerous sites, including large industrial and military installations.
Bedrock & Fractured Rock Treatment Approaches
IET addresses contamination in fractured bedrock environments using high-pressure injection, pneumatic fracturing, and targeted zone isolation. Amendments are delivered into discrete fracture zones to treat dissolved-phase and DNAPL contamination in settings where conventional boring and injection would miss target intervals. Combined with rock coring for detailed site characterization.
IET's Commitment to Emerging Technologies
IET continuously evaluates and adopts emerging remediation innovations β from nano-scale materials to advanced delivery systems β to stay ahead of challenging site conditions and evolving regulatory standards.
Nano-Scale ZVI (nZVI)
Sub-micron zero-valent iron particles with dramatically increased reactive surface area. IET deploys nZVI via direct push and recirculation for deep DNAPL source zones and fractured rock environments.
Encapsulated Slow-Release Amendments
IET's patented polymer-encapsulated substrates and oxidants provide multi-year sustained release from a single injection event β reducing mobilization costs and extending treatment longevity.
Sequential Multi-Technology Programs
Integrating molecular biological tools (MBTs), compound-specific isotope analysis (CSIA), and real-time geochemical monitoring to adapt treatment programs dynamically and achieve faster regulatory closure.
