Beyond the Surface: Advanced Scientific Solutions for the Remediation of Complex and Recalcitrant Contaminants

Site Characterization: The Foundation of Success

Before injecting any reagent, it is essential to build an accurate Conceptual Site Model (CSM).
We collaborate with environmental consultants and geologists to analyze:

• The nature of the contaminant: Is it a DNAPL (Dense Non-Aqueous Phase Liquid) that tends to sink, or an LNAPL that floats on the groundwater?
• Aquifer geochemistry: Parameters such as pH, Redox Potential (ORP), and natural electron acceptors dramatically influence the effectiveness of reagents.
• Soil permeability: determines how and where we can inject products to ensure contact with the pollutant.

Intervention Technologies: Oxidation and Reduction

Il portfolio tecnologico di DeltaNova, arricchito dalla partnership con leader globali come
Tersus Environmental,
copre l’intero spettro delle reazioni chimiche utilizzabili per la bonifica.

ISCO (In-Situ Chemical Oxidation)

For contaminants such as petroleum hydrocarbons (TPH), BTEX (Benzene, Toluene, Ethylbenzene, Xylene), and some pesticides, oxidation is often the preferred route.
We use powerful oxidants (such as activated persulfates or modified peroxides) that “strip” electrons from contaminant molecules, breaking their chemical bonds,
converting them into CO2 and water. The technical challenge is stabilizing these oxidants so that they last long enough underground to permeate the contaminated matrix.

Learn more about our approaches and applications in the dedicated
products section
(internal link).

ISCR (In-Situ Chemical Reduction)

When dealing with chlorinated solvents (PCE, TCE, VC) or heavy metals (e.g., chromium VI), the strategy is reversed.
Here, we use reductants, often based on micrometric or nanometric zero-valent iron (ZVI). The process works by donating electrons to the contaminant:

• Chlorinated solvents: Reductive bleaching replaces the chlorine atoms with hydrogen, rendering the molecule harmless.
• Heavy metals (Chromium VI): reduction transforms it into trivalent chromium, which is less toxic and less mobile, promoting precipitation and immobilization in the soil.

The Crucial Role of R&D and Nanotechnology

What sets DeltaNova apart is our ongoing commitment to Research and Development. We have participated in European research projects focused on the application
of reactive micro- and nanomaterials. Why is this important? Because contaminants often hide in micropores inaccessible to traditional viscous liquids.

Our colloidal suspensions and nanotechnology products have a rheology designed to flow like water, reaching stagnation zones where
the residual contaminant mass resides (back-diffusion). Furthermore, we adopt solutions that combine absorption and biological or chemical degradation, enabling strategies
“Trap & Treat” to reduce plume migration.

For bibliographic support, you can consult a PubMed search:
“Zero Valent Iron for groundwater remediation”
.

Monitoring and Validation of Results

Science doesn’t end with the injection. Successful remediation requires rigorous post-intervention monitoring. DeltaNova supports clients
in interpreting data:

• Verification of the reduction of pollutant concentrations.
• Monitoring of reaction by-products (to ensure that degradation is complete).
• Analysis of geochemical parameters to confirm conditions favorable for remediation.

Global Partner, Local Expertise

Collaboration with international universities and industrial partners allows us to bring advanced, globally proven technologies to Italy and Europe.
However, we apply these technologies with specific sensitivity to local regulations and geological conditions. Whether it’s an active industrial site,
a brownfield area, or a compromised aquifer, DeltaNova designs the right chemistry for the specific problem.

Conclusion: Trust in Science

In a complex world, environmental remediation requires more than just machinery: it requires advanced chemistry, fluid physics, and applied biology.
Choosing DeltaNova means choosing a partner that understands the science behind every pollutant molecule and transforms it into measurable results.

Recommended external links

• ITRC (Interstate Technology & Regulatory Council)
  – technical guides on DNAPL characterization and ISCO/ISCR technologies
• CLU-IN (EPA Clean Up Information)
  – portal on remediation technologies and case studies
• PubMed – Zero Valent Iron for groundwater remediation
  – scientific research on ZVI and groundwater remediation