The ISR Model is a three-dimensional reactive transport model that provides a number of innovative and unique modeling tools for simulating transport of PFAS, chlorinated solvents, petroleum hydrocarbons, metals such as hexavalent chromium, and radionuclides.  These modeling tools facilitate improvements in the cost-effectiveness of in-situ remediation alternatives, and they help to increase our understanding at complex sites.

The ISR Model was developed based on the MT3DMS model framework.  ISR Model incorporates the flexible organic and inorganic reaction framework from BioRedox (Carey et al., 1998).  BioRedox-MT3DMS was developed by Dr. Grant Carey (now with Porewater Solutions), with support from Dr. Paul Van Geel (Carleton University, Ottawa, Ontario) and Richard Murphy (GHD, Waterloo, Ontario). 

Since 2017, the ISR Model has been used to simulate the performance of PFAS in-situ adsorption barriers at both the field and laboratory scale.  Porewater Solutions has used the ISR Model to support a number of SERDP and ESTCP projects for the United States Department of Defense.  Specialized functionality being incorporated into the ISR Model for PFAS include:

• CAC injection into existing PFAS plumes with mass re-equilibration
• Kinetic adsorption and desorption
• Competitive adsorption
• Colloid transport
• CAC aging
• Branched decay chains for precursor transformation to PFAAs

CLICK HERE for our 2023 Remediation Journal paper (open access).