RegenOx™ In-Situ Chemical Oxidation (ISCO)


Download the Principles of RegenOx Chemical Oxidation Technology Design Manual

Product

RegenOx is an advanced chemical oxidation technology that destroys contaminants through powerful, yet controlled chemical reactions and not through biological means. This product maximizes in situ performance while using a solid alkaline oxidant that employs a sodium percarbonate complex with a multi-part catalytic formula. RegenOx directly oxidizes contaminants while its unique catalytic component generates a range of highly oxidizing free radicals that rapidly and effectively destroy a range of target contaminants including both petroleum hydrocarbons and chlorinated compounds.

Purpose

To rapidly and effectively destroy target contaminants in high concentration source areas within the saturated and vadose zones. For petroleum hydrocarbon treatment, RegenOx also produces a fair amount of oxygen as a result of its reactions providing for an advantageous and seamless transition from in-situ chemical oxidation to enhanced aerobic bioremediation.

Functionality

A RegenOx application will remove significant amounts of contamination from the subsurface (both soil and groundwater) and is applied using direct-injection techniques or wells. The application process enables the two part product to be combined, then pressure injected into the zone of contamination and moved out into the aquifer media. Once in the subsurface, RegenOx produces a cascade of efficient oxidation reactions via a number of mechanisms including: surface mediated oxidation, direct oxidation and free radical oxidation. These reactions destroy a range of contaminants and can be propagated in the presence of RegenOx for periods of up to 30 days on a single injection. RegenOx produces minimal heat and is highly compatible with follow-on enhanced bioremediation application. Additionally RegenOx is a powerful yet relatively safe chemical oxidant that is safe for use in direct contact with underground utilities/infrastructure as it is non-corrosive and produces very low amounts of heat and pressure. As a result the material can be applied using a wide-range of standard field equipment (e.g. direct push injection rigs) or applied directly into excavations.

RegenOx Produces Beneficial Detergent-Like Contaminant Desorption Effects

This process occurs as a result of the powerful desorption-surfactant like effect of RegenOx (principally the catalyst) that draws the contaminant off the soil surface and into solution. The contaminant then reaches the catalytic surface where localized free-radical generation occurs leading to focused more efficient contaminant destruction. This also restricts the oxidant losses onto tightly bound and heavier soil organics such as humic, roots, and other natural or immobile fractions. As a result of the above processes, RegenOx-desorbed contaminant mass and partially oxidized (more soluble) organic species can be recovered via groundwater extraction using existing Pump &Treat (P&T) systems, while further contamination is destroyed in situ by via the primary oxidation mechanisms. Augmentation of P&T systems using RegenOx can allow for enhanced recovery of petroleum hydrocarbons from soil and groundwater. This process can also be utilized to enhance or optimize multi-phase extraction (MPE) activities during site remediation.

Product Specifications

  • A two part product (Part A is the oxidizer powder, Part B is the liquid activator)
  • Part A Composition: A mixture of sodium percarbonate [2Na2CO3- 3H2O2], sodium carbonate [Na2CO3], sodium silicate and silica gel
  • Part B Composition: A mixture of sodium silicate solution, silica gel and ferrous sulfate
  • Packaged and delivered in 30 lb. PVC buckets

Field Applications

  • Applicable in Source Areas - ppm levels
  • Petroleum, chlorinated or mixed plumes
  • Vadose and saturated zone
  • Ex-situ or in-situ
  • Direct-injection (most common) for source areas and plumes
  • Injection wells
  • Straight application in excavations
  • Soil mixing, milling and trenches

Benefits of Use

  • Rapid and sustained oxidation of target compounds
  • Detergent-like, contaminant desorption effects
  • Safety – generates minimal heat and pressure unlike other widely used chemical oxidants
  • Compatible with underground infrastructure, conduits, piping and tanks
  • Easily applied with readily available equipment
  • Destroys a broad range of contaminants
  • More efficient than other solid oxidants
  • Enhances subsequent bioremediation
  • Avoids detrimental impacts to groundwater
  • Longevity - lasts up to 30 days on a single injection
  • No Operations and Maintenance
  • Faster and more cost-effective than drawn out monitored natural attenuation (MNA)
  • Complimentary product application design and site analysis from Regenesis

Application Considerations

  • Contaminant type and mass
  • Subsurface geology (distribution)
  • Depth to groundwater
  • Groundwater flow rates
  • Free product (if present call Regenesis tech services to discuss options)