New water treatment zap “Forever Chemicals” forever


Chemistry chemical molecule concept

PFAS (perfluoroalkyl substances and polyfluoroalkyl substances) are a group of synthetic chemicals widely used in various industrial and consumer products due to their unique properties such as resistance to heat, water and oil. However, PFAS persist in the environment and can bioaccumulate in humans, and can pose potential health risks such as thyroid dysfunction, reproductive and developmental toxicity, and increased risk of certain cancers. I know that.

Engineers at the University of British Columbia have developed an innovative water treatment system that efficiently, safely and completely removes “permanent chemicals” from drinking water.

“Think of a Brita filter, but it’s a thousand times better,” said Dr. Majid Moseni, a professor of chemical and bioengineering at UBC who developed the technology.

Forever Chemicals, formally known as PFAS (per- and polyfluoroalkyl substances), are a vast group of substances that give certain products their non-stick and stain-resistant qualities. Over 4,700 of his PFASs are used, and these chemicals are commonly used in rain gear, nonstick cookware, stain repellents, firefighting foam, and more. Studies have linked PFAS to a variety of health issues, including hormonal imbalances.[{” attribute=””>cardiovascular disease, developmental issues, and even cancer.

To remove PFAS from drinking water, Dr. Mohseni and his team devised a unique adsorbing material that is capable of trapping and holding all the PFAS present in the water supply.

UBC Unique Adsorbing Material

UBC researchers devised a unique adsorbing material that is capable of capturing all the PFAS present in the water supply. Credit: Mohseni Lab/UBC

The PFAS are then destroyed using special electrochemical and photochemical techniques, also developed at the Mohseni lab and described in part in a new paper published recently in Chemosphere.

Madjid Mohseni

UBC researcher, professor Madjid Mohseni. Credit: University of British Columbia

While there are treatments currently on the market, like activated carbon and ion-exchange systems which are widely used in homes and industry, they do not effectively capture all the different PFAS, or they require longer treatment time, Dr. Mohseni explained.

“Our adsorbing media captures up to 99 percent of PFAS particles and can also be regenerated and potentially reused. This means that when we scrub off the PFAS from these materials, we do not end up with more highly toxic solid waste that will be another major environmental challenge.”

He explained that while PFAS are no longer manufactured in Canada, they are still incorporated in many consumer products and can then leach into the environment. For example, when we apply stain-resistant or repellent sprays/materials, wash PFAS-treated raingear, or use certain foams to put down fires, the chemicals end up in our waterways. Or when we use PFAS-containing cosmetics and sunscreens, the chemicals could find their way into the body.

For most people, exposure is through food and consumer products, but they can also be exposed from drinking water – particularly if they live in areas with contaminated water sources.

Dr. Mohseni, whose research group also focuses on developing water solutions for rural, remote, and Indigenous communities, noted: “Our adsorbing media are particularly beneficial for people living in smaller communities who lack resources to implement the most advanced and expensive solutions that could capture PFAS. These can also be used in the form of decentralized and in-home water treatments.”

The UBC team is preparing to pilot the new technology at a number of locations in B.C. starting this month.

“The results we obtain from these real-world field studies will allow us to further optimize the technology and have it ready as products that municipalities, industry, and individuals can use to eliminate PFAS in their water,” said Dr. Mohseni.

Reference: “Electrochemical degradation of PFOA and its common alternatives: Assessment of key parameters, roles of active species, and transformation pathway” by Fatemeh Asadi Zeidabadi, Ehsan Banayan Esfahani, Sean T. McBeath, Kristian L. Dubrawski and Madjid Mohseni, 3 January 2023, Chemosphere.
DOI: 10.1016/j.chemosphere.2023.137743





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