DTSC

Greener Solutions 2020: PFAS in Aftermarket Carpet Treatments

The aftermarket carpet treatment team presented PFAS alternatives for aftermarket stain repellant treatments. Their proposed solutions included natural waxes and oils, biopolymers, and silicon-based materials, including silicon dioxide nanoparticles and silicon-containing small molecules and polymers. The team identified chitosan and cellulose nanocrystal as candidates for a biopolymer approach. The team noted the potential to combine multiple strategies to achieve optimal performance metrics....

Greener Solutions 2020: PFAS removal for carpet recycling

The carpet recycling group presented innovative strategies to remove PFAS from carpet face fiber fluff during recycling. The team provided strategies with a range of timescales to implementation. The first strategy involved using base hydrolysis and granular activated carbon (GAC) adsorption to remove but not destroy PFAS. The second strategy built on the first, but proposed using reverse osmosis and plasma treatment to destroy the PFAS. The third strategy proposed the use of esterase (specifically pig liver esterase) as an alternative to using sodium hydroxide in the other...

Greener Solutions 2021: Alternatives for 6PPD in tire manufacturing

Saving coho salmon: Alternatives for 6PPD in tire manufacturing

In early 2021, 6PPD-quinone, which is a transformation product of 6PPD, was discovered as the likely cause of pre-spawn mortality in Coho salmon in the Pacific Northwest. 6PPD is a critical tire rubber additive with high-performing antidegradant properties. The team proposed four strategies: the use of food preservatives, such as gallates; replacement with the polymer lignin; modification of 6PPD to prevent formation of its toxic quinone form; and finally, broader process-level changes,...

Greener Solutions 2020: PFAS-Free Compostable Food Packaging

The food packaging team identified alternatives to fluoropolymer mixtures in molded fiber such as rhamnolipids and pectin added to the existing paper system and nanocellulose and lignin sourced from within the paper system. The team thought creatively to identify how materials that would normally be wasted in the existing paper production system could be reused.

Final Presentation...

Greener Solutions 2012: E-waste Challenge with HP

During the fall of 2012 we partnered with Hewlett Packard and the Department of Toxic Substance Control on a project related to the informal e-waste recycling sector. An interdisciplinary team of students from Chemistry, Chemical Engineering, Environmental Science and Public Health worked with scientist at HP to characterize the processes and emissions from common e-waste recycling practices. This information informs changes to the design of consumer electronics that minimize the use of harmful substances, as well as identifying emerging contaminated from newer generations of...