IN-SITU CHEMICAL OXIDATION

 In situ chemical oxidation (ISCO) is a technology used for soil and groundwater remediation which reduces contaminant concentrations to acceptable levels. The advanced oxidation technology and environmental remediation technique uses reactive chemical oxidants to change harmful contaminants within the subsurface into less harmful contaminants or eliminate them completely.

ISCO involves injecting strong chemical oxidisers directly into the contaminated medium (soil or groundwater) to destroy any chemical contaminants. Permanganate, persulfate, hydrogen peroxide and ozone are the four most commonly used oxidants, with catalysts sometimes added to increase the speed of the chemical reaction. In-situ chemical oxidation remediates a variety of organic compounds, including compounds that are resistant to natural degradation.

Numac provides in-situ chemical oxidation for soil and groundwater remediation from our locations in Melbourne, Sydney and Brisbane. We offer a range of injection systems to suit a wide variety of applications and can modify each system for project-specific requirements.

INJECTION METHODS

In most situations, an injection probe is pushed to the required injection depth and pumping commences without installing a permanent well. This method allows for precision injection and eliminates permanent well installation, monitoring and decommissioning overheads.

Permanent injections wells allow for follow-up injection events and reduce or eliminate the need for an on-site drilling rig. Permanent wells with set screens don’t, however, allow for tailored injection depths after the results from injection events are examined.

The use of MIP, UVOST and HPT systems provides high-resolution data to effectively plan an ISCO remediation event. The use of innovative high resolution technologies enables preferential pathways, plume distribution and concentration identification, and delivers the best results.

NUMAC CHEMICAL INJECTION SYSTEMS

  • Mobilising from our Melbourne, Brisbane and Sydney depots

  • Mobile skid-mounted ISCO unit on a truck carrier can be positioned anywhere on site

  • Ability to inject simultaneously in up to 4 locations

  • Aggressive compounds can be mixed safety in large volume batches

  • Injections can use a wide variety of pressure ranges, from 5psi through to 650psi

  • 360o horizontal injection can be achieved with temporary screens or injection probes

  • ISCO system can be connected to existing monitoring wells using injection caps or directly via injection rods with adjustable screen intervals

  • Numac can assist with extraction wells and aboveground water treatment.

Injection manifold - 4 lines, digital flow meters, individual gauges and flow control.

Injection manifold - 4 lines, digital flow meters, individual gauges and flow control.

Fully inert, fully contained, computer controlled, 316 stainless steel mixing and transfer unit.

Fully inert, fully contained, computer controlled, 316 stainless steel mixing and transfer unit.

Temporary injection screens can be pushed in by rig and target small specific zones in the subsurface.

Temporary injection screens can be pushed in by rig and target small specific zones in the subsurface.