AquaGate+PAC™ Selected by the U.S. Military for In-Situ Treatment of Contaminated Sediments

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A leading manufacturer of composite particle materials for environmental remediation has demonstrated a new product for treatment and reduction of contamination in sediments.

Low-impact application of AquaGate+PAC.

AquaGate+PAC with activated carbon was considered to be well suited for application in a wetland environment.

AquaBlok, Ltd., a leading manufacturer of composite particle materials for environmental remediation, has demonstrated a new product for in-situ treatment and reduction of contamination in sediments. AquaGate+PAC is a new powder-activated carbon delivery approach developed by AquaBlok. The material was installed at a U.S. Military facility to verify its capability to sequester and reduce contaminants in marsh sediments without resorting to far more costly and damaging removal and restoration remedies.

The new composite particle approach, along with a new low-impact installation system developed by AquaBlok, was tested by the U.S. Military under ESTCP (Environmental Security Technology Certification Program) funding. Selected for its ease of handling and ability to form a protected and even coating of treatment material, AquaGate+PAC with activated carbon was considered to be well suited for application in a wetland environment. The ability to uniformly place treatment materials in a submerged or semi-submerged sediment setting is the key benefit offered by the new material.

The Department of Defense (DoD) funded AECOM Environment and the University of New Hampshire (UNH), to demonstrate and validate an innovative technology for the in-situ sequestration of contaminants present in hydric soils of palustrine wetlands (ESTCP Project ER-0825: In-Situ Wetland Restoration Demonstration). The overall objective of the project is to demonstrate the efficacy of new remediation technologies without damaging the ecology of wetland systems through conventional removal approaches.

Technical and funding participants in the project include: the Naval Facilities Engineering Service Center (NFESC), and its DoD partners [Naval Facilities Engineering Command (NAVFAC), U.S. Army Center for Health Promotion and Preventive Medicine (USACHPPM), Naval Facilities Engineering Command Atlantic Division (NAVFAC Atlantic), Air Force Center for Environmental Excellence (AFCEE), and Engineer Research and Development Center (ERDC) Waterways Experiment Station.

Key advantages of AquaGate+ materials:

  • High Permeability: In the range of 5x10-3 cm/sec. (permeability can be varied)
  • Uniform Activated Carbon Delivery: Coated Aggregate Delivers 5% Activated Carbon by Weight
  • Powder Activated Carbon Improves Rate of Adsorption: 325 Mesh (44 Micron) Size Material
  • Uniform Mixing and Placement with Sand: Enhances Chemical Isolation Layer
  • Positive Placement and Improved Stability: Aggregate Holds Carbon at Placement Location
  • Release of Activated Carbon to Sediments: Coating Material Breaks Down and Mixes Over Time

AquaGate+ amended materials were developed by AquaBlok to treat a range of environmental contaminants, and can be manufactured to meet the needs of most remediation sites. Many treatment plans are available depending on the site profile and specific contaminants. AquaBlok is currently able to provide a composite particle with the following range of treatment materials:

  • Activated Carbon                     
  • Zero Valent Iron                     
  • Sulphur                         
  • Zeolites        
  • Organoclays (various manufacturers)
  • Shredded Tire                
  • Aluminum Sulfate

Sites & Contaminants:                    
Manufactured Gas Plants (MGP) - PAH            
Wood Treatment Facilities (Creosote)             
Mercury / Arsenic / Metals                    
Chlorinated – PCB’s, VOC                 
DDT / Ammonia / Phosphorus    

Sediment Capping
Permeable Reactive Barriers (PRB)
Cut-off Walls / Soil Mixing
Ponds / Wetlands / Filtration
Berms / Spill Control Applications            

About AquaBlok, Ltd.
AquaBlok, Ltd. is a manufacturer of composite materials utilizing its patented coating and amendment approach. The company has a long history in the environmental industry and a range of products utilized in sediment remediation technologies. AquaBlok utilizes its delivery system in a range of other products, including pond and industrial impoundment sealing, as anti-seep collars or trench dams around utility piping, to construct cut-off walls in porous soil conditions, flood control applications (levee and dam protection), and to deliver organoclay-based materials.


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John Collins

Eric Kraus
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