Activated Carbon Injection Systems

As a leader in purification processes, Cabot Norit Activated Carbon designs activated carbon injection (ACI) systems for a variety of needs.

ACI systems have long been recognized as an effective and cost efficient way to reduce mercury emissions from coal-fired boiler flue gases. These systems pneumatically inject powdered activated carbon (PAC) from a storage silo into the flue gas ductwork of a coal-fired power plant or cement kiln. Once dispersed into the flue gas stream, the PAC adsorbs the vaporized mercury from the flue gas and is then collected with the fly ash in the plant's particulate collection device. 

Designed for lasting dependability in challenging environments, we offer a complete range of bulk silos, mobile silos, pressure vessels and bulk bag systems for both wet and dry applications. In addition to equipment, we also provide turnkey systems that include on-site installation, equipment startup, operator training and service programs. 

We have been leading the way in research and development in this industry with systems in operation for more than 25 years. Our ACI systems can reduce mercury emissions by greater than 90%, depending upon the type of coal being burned and the type of air pollution control equipment installed on the plant.

Learn more about the features of our ACI systems:

Bulk silo dry PAC systems

We offer two systems that can be tailored to your application to deliver years of reliable performance for dosing into:

  • Flue gas. The choice for injecting PAC into flue gas streams to control regulated compounds such as mercury and dioxins from coal-fired utilities, cement kilns, incinerators, industrial boilers and metal smelters. The PAC dosage is continuously adjustable and pneumatically conveyed into the flue gas stream.
  • Liquids. This system cleanly and accurately doses PAC into a liquid stream to remove organic compounds, color bodies and odor-causing contaminants from beverages, water, wastewater and other industrial applications. The PAC delivery system includes hydraulic mixing and conveys a continuously adjustable PAC dosage rate into a liquid stream.

The benefits of silo systems for dosing into flue gas and liquids include:

Simplified operations
  • Remote control/alarm interface standard
  • Fully featured programmable logic controller (PLC)-based control system
  • Minimal operator attendance required
  • Start-up and operator training provided
Minimized maintenance
  • Dust-free operation
  • Reduced labor cost
  • Multiple feed systems from one silo
  • 40,000 pound deliveries in fully sealed trucks

PortaPAC® system

Our PortaPAC system is a simple and cost-effective way to meter PAC from bulk bags into liquid or flue gas applications. The feeder is portable and built in two 8 foot sections, which make shipping, set-up and relocation quick and easy. The system can be permanently installed for applications with smaller volume requirements or used as a temporary system for full-scale testing. 

Benefits of our PortaPAC system include:

  • Compact design: 6 foot by 6 foot footprint
  • Local or remote operation and monitoring of the system
  • Consistent and dependable feed rates
  • Flue gas applications use a regenerative blower with matching eductor to ensure smooth, trouble-free transfer of the metered PAC to the injection point.
  • Liquid applications utilize a stainless steel wash down vessel. A slipstream of the motive liquid is added tangentially to promote down flow of the metered carbon into the eductor mouth. A liquid pressure switch is supplied to detect the presence of a motive fluid, which prevents overflow and results in safe, reliable operations.

Mobile silos

These systems are specifically designed for temporary use in full-scale plant test programs to evaluate the PAC injection technology's ability to control regulated compounds including mercury, dioxins and hydrocarbons. They feature the same benefits as our permanent systems. After testing is completed, the mobile silo system is removed and transported by flatbed trailer to another plant site. They are made of prefabricated components for fast set up and we offer 24/7 operation.

Granular activated carbon (GAC) systems

  • Multiple designs to choose from ranging in diameter from 30 to 120 inches
  • Liquid flow rates ranging from 5 to 550 gallons per minute (gpm)
  • GAC capacity from 500 to 20,000 pounds
  • Vapor flow rates ranging from 180 to 4800 cubic feet per minute (cfm)
  • Carbon steel with internal epoxy coating standard, other options available

Drum filters

  • In stock for immediate shipment
  • Drum volumes from 150 to 300 liters
  • Suitable in water, food, beverage and chemical applications


Our AEROPURE V series adsorption vessels are the recommended systems to treat gas streams in a wide variety of applications. Their modular design provides maximum flexibility for location and treatment requirements. Our gas vessels are designed for either pressure – 10 pounds per square inch (psig) – or vacuum – 28" mercury (Hg) maximum – operation and temperatures up to 150˚F, and systems range in size from 500 to 30,000 pounds.


Our LIQUIDPURE L series adsorption vessels are the recommended systems to treat liquid streams in a wide variety of applications. Their modular design provides maximum flexibility for location and treatment requirements. Our liquid vessels are designed for operating pressures between 125 psig and -15 psig (vac) and temperatures up to 150˚F.