Press Release

Calgon Carbon Releases Second Peer-Reviewed Study Confirming PFAS Removal and Destruction with Custom Municipal Reactivation

PITTSBURGH, PA  –  10/02/2025

Highlights:

• >99.9% PFAS Destruction Removal Efficiency. Achieved during full-scale thermal reactivation of
  spent drinking water carbon under Calgon Carbon’s typical operating conditions using OTM-45’s
  conservative calculation methodology.
• Removes PFAS from the Spent Carbon to Non-Detect Levels. The study confirms all tested PFAS
  compounds were removed to below detectable levels from the spent carbon through Calgon
  Carbon’s proprietary custom municipal reactivation process.
• No Products of Incomplete Combustion (PICs) or Reformed PFAS Detected. State-of-the-art
  EPA test methods (OTM-50, and EPA Method 0010/8720 for fluorinated PIC’s analysis) found no
  detectable PFAS PIC byproducts or reformed PFAS emissions throughout the reactivation process.
  Results Mirror Prior White Paper. New findings reinforce those of Calgon Carbon’s first peer-
  reviewed PFAS study in 2022 for industrial reactivation while improving upon the scientific
  understanding of reactivation using state-of the art analytical methodology.
• Establishes a Clear Differentiator for Addressing “Forever Chemicals.” Unlike other approaches
  that simply transfer PFAS into another waste stream for disposal or incineration, Calgon Carbon’s
  reactivation technology provides an economical, verified pathway to recycle activated carbon for
  continued use.

Calgon Carbon Corporation (“Calgon Carbon”), a wholly owned subsidiary of Kuraray Co., Ltd.
(TYO: 3405), announced the publication of its second peer-reviewed white paper on the
reactivation of PFAS laden spent carbon, titled “Destruction of PFAS During Thermal Reactivation
of Granular Activated Carbon Used in Potable Water Treatment,” in the Remediation Journal.
Building on our prior peer-reviewed work, this study not only reaffirms the proven performance of
reactivation but uniquely validates the effectiveness of Calgon Carbon’s proprietary full-scale
drinking water reactivation process, commonly referred to as custom municipal reactivation.
Through high-temperature reactivation, municipalities and industrial users can recycle spent
activated carbon while removing the PFAS contaminants below detectable limits from the carbon
with a destruction removal efficiency of > 99.9%. Unlike other PFAS treatment approaches,
reactivation returns carbon to service, expands supply availability, and lowers CO₂ emissions
compared to virgin activated carbon production, a solution that reduces waste and supports
sustainability goals.

“This publication once again highlights Calgon Carbon’s leadership in water treatment innovation
and our unwavering commitment to combatting PFAS pollution,” said Steve Schott, President and
CEO of Calgon Carbon Corporation. “By investing in research and validating our solutions through
peer-reviewed science, we continue to deliver the confidence our customers and communities
need to tackle these contaminants head-on.”

The study’s findings come at a pivotal moment as municipalities nationwide are testing for PFAS
and preparing treatment plans to meet the U.S. EPA’s new Maximum Contaminant Levels (MCLs).
These results provide utilities with independent validation that reactivation is a proven, scalable
path forward at a time when compliance is both urgent and unavoidable.

“The data detailed in our article effectively demonstrated the removal of PFAS compounds from
granular activated carbon (GAC) and greater than 99.9% destruction removal efficiency for PFAS
compounds through the furnace and off-gas abatement system. Expanding on the results from
the prior publication, the study yielded non-detect results for products of incomplete combustion
and reformed PFAS using state-of-the-art test methods. Importantly, this study addresses the
U.S. EPA’s desire for additional data around the potential formation of these byproducts during
reactivation.” said Dr. Elisa Mayerberger, lead author of the Remediation article and Applications
Engineer at Calgon Carbon.

GAC is the most widely used and well-established technology for the treatment and removal of
PFAS contaminants from drinking water and wastewater. Calgon Carbon’s FILTRASORB® GAC,
sourced from bituminous coal, has demonstrated superior PFAS-removal capabilities compared to
other carbons for over two decades. Thermally treating GAC at the end of its initial service life —
known as spent carbon — is called reactivation, a process that desorbs and destroys adsorbed
contaminants at extremely high temperatures and restores the GAC to a near-virgin state so it can
be reused for multiple cycles with the same results.

In the first stage of Calgon Carbon’s proprietary reactivation process, PFAS-laden GAC is heated in
a furnace for several hours at high temperatures, imparting enough energy to break down PFAS’s
carbon-fluoride bonds, the strongest in chemistry.

The off gas from the reactivation furnace then moves into an abatement system, which features a
thermal oxidizer/afterburner designed to destroy any organics that were not destroyed in the
furnace. From there, it proceeds through a scrubber to neutralize any acid gases, such as hydrogen
fluoride, and removes them from the abatement air. Finally, it passes through a baghouse to
eliminate particulate matter.

The result is a closed-loop, cost-effective solution that not only addresses a public health problem
but also eliminates long-term PFAS waste from entering landfills. Calgon Carbon currently
operates the world’s largest network of GAC reactivation facilities, including six reactivation plants
across the U.S., with additional facilities in Europe and Asia. This global infrastructure ensures that
our customers can manage PFAS-laden carbon in a way that significantly reduces landfill usage
and generates less greenhouse gas emissions as compared to virgin activated carbon
replacement.

“PFAS are often called ‘forever chemicals,’ but our superior performing FILTRASORB products
effectively remove these PFAS compounds from water to non-detectable levels and, when coupled
with our advanced reactivation process, destroy them to near non-detect levels,” said Jenalle
Brewer, Drinking Water Solutions, Innovative Carbon Technologies and Global Strategy &
Communications. “For more than two decades, Calgon Carbon has been at the forefront of PFAS
remediation, and this second peer-reviewed study provides further validation of our technical
leadership. We will continue to invest in our people, products, and services to help municipalities
in their mission to treat drinking water with effective, science-based solutions.”

The new white paper “Treatment of PFAS During Thermal Reactivation of GAC Used in Potable
Water Treatment” is published in the Fall 2025 issue of Remediation Journal and is available via
open access. Water treatment professionals and stakeholders are encouraged to review these
findings to better understand how Calgon Carbon’s technology is electively removing PFAS to non-
detectable levels and enabling the elective recycling of reactivated carbon in drinking water
treatment.

To learn more about Calgon Carbon’s study and the FILTRASORB product, visit NoMorePFAS.com.

About Calgon Carbon
Calgon Carbon, a wholly-owned subsidiary of Kuraray Co., Ltd. (TYO: 3405) (Kuraray), is a global
leader in the manufacture and/or distribution of innovative coal-, wood- and coconut-based
activated carbon products — in granular, powdered, pelletized, cloth, and sheet form — to meet
the most challenging purification demands of customers throughout the world. Calgon Carbon
provides purification solutions for more than 700 distinct applications, including drinking water,
wastewater, pollution abatement, and a variety of industrial and commercial manufacturing
processes. Headquartered in Pittsburgh, Pennsylvania, Calgon Carbon employs approximately
1,750 people and operates 20 manufacturing, reactivation, innovation and equipment fabrication
facilities in the U.S., Asia, and in Europe, where Calgon Carbon is known as Chemviron. Calgon
Carbon was acquired by Kuraray in March of 2018. With complementary products and services,
the combined organization will continue to focus on providing the highest quality and most
innovative activated carbon and filtration media products, equipment, and services to meet
customer needs anywhere in the world. Visit CalgonCarbon.com.