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John Collins
John Collins

COO/General Manager
AquaBlok, Ltd.

John Collins is the COO of AquaBlok, Ltd. He has over 25 years’ experience in engineering and environmental businesses managing research, product development, technology licensing, capital goods manufacturing, and venture capital investments.  Throughout his ten years with AquaBlok, he has helped develop multiple new products and managed major remediation projects.


Addressing Contaminated Ground Water to Surface Water Discharge: Application of Materials and Methods for Construction of In-Situ Permeable Reactive Barriers (PRB) to Limit Migration of PFAS

Controlling PFAS-contaminated groundwater, particularly in areas adjacent to canals, waterways and other bodies of water, is imperative to reducing impacts on water sources and habitat. A Permeable Reactive Barrier (PRB) has been proven to minimize the potential movement and impact of petroleum and PFAS contamination from upland areas into surface water and can provide a cost-effective, in-situ, passive alternative to pump-and-treat. In this presentation, best available materials and construction methods for the design of a PRB to address PFAS in groundwater will be discussed. A description of the type of materials, the treatment approach, and the use of a funnel & gate design will be provided. Data and case studies, as well as an overview of materials that have been applied to both isolate (low-permeability) and treat (via adsorptive amendments e.g. RemBind®) will also be presented. Examples will highlight both petroleum- and PFAS-related sites and applications.

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