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Journal articles
Magazine articles
Open Access
Perfluoroalkyl and polyfluoroalkyl substances (PFAS) — Fibrous substrates, TAPPI Journal September 2023

ABSTRACT: Perfluoroalkyl and polyfluoroalkyl substances (PFAS) have been implemented during the finishing process of textiles such as upholstery, clothing, personal protective equipment, and sports gear to provide water resistance. Currently, PFAS are still present at quantifiable levels in consumer products and food, even though many companies have started to phase out PFAS treatment with non-toxic water repellant replacements given the possible detrimental health effects suggested by current research. This paper is a detailed review that focuses on how PFAS are implemented in textile production and sources of PFAS contamination during chemical treatments. This review also addresses current legislation on PFAS emissions and trade regulations to decrease exposure of consumers due to toxicokinetics and mechanisms of action through-out the body that are still not well understood. This paper includes a literature review on possible PFAS related health conditions shown from past research and contains suggested toxicity levels, exposure routes, duration, and pathways detailed to the best of our ability.

Journal articles
Magazine articles
Open Access
Cross-flow separation characteristics and piloting of graphene oxide nanofiltration membrane sheets and tubes for kraft black liquor concentration, TAPPI Journal September 2023

ABSTRACT: Dewatering of weak black liquor (WBL) in the kraft cycle by evaporation is highly energy intensive. Membranes are an attractive alternative for energy-efficient dewatering, but existing commercial polymeric or ceramic membranes are either degraded in BL or have high capital costs. Our recent works have demonstrated the engineering of graphene oxide (GO) nanofiltration membranes, their stability and promising performance in BL conditions, and preliminary scale-up into sheets and tubes. Here, we describe in detail the separation characteristics of GO membrane sheets and tubes under real BL conditions and crossflow operation. Recycle-mode piloting of a GO tubular membrane showed average “production flux” of 16 L/m2/h (LMH) and high rejections of lignin (98.3%), total solids (66%), and total organic carbon (83%), with no signs of irreversible fouling identified. A corresponding GO sheet membrane produced an average flux of ~25 LMH and maintained high lignin rejection of ~97% during a slipstream pilot at a kraft mill site using WBL with ~16 wt% total solids (TS). Finally, we piloted a Dow/DuPont XUS1808 polyamide composite reverse osmosis (RO) membrane for last-mile processing of the GO nanofiltration membrane permeate. The RO membrane showed a steady state flux of 19 LMH at 65 bar and produced ~0.02 wt% TS water product, which is highly suitable for reuse in pulp washing operations in the kraft process. The results have strong positive implications for the industrial application of GO membranes in BL concentration and other related applications.

Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º September/October 2023

TAPPI Journal Summaries, Paper360º September/October 2023

Journal articles
Are Your Wood Products Really Certified?, Paper360° September/October 2011

Are Your Wood Products Really Certified?, Paper360º November/December 2011

Journal articles
Magazine articles
Open Access
Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL Febru

Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL February 2010

Journal articles
Open Access
CFD-Based Modeling of Kraft Char Beds â?¢ Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010

CFD-Based Modeling of Kraft Char Beds • Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010

Journal articles
Open Access
New Possibilities In Bleaching Wood-Containing Dip: Alternative To Alkaline Peroxide Bleaching, February 2010

New Possibilities In Bleaching Wood-Containing Dip: Alternative To Alkaline Peroxide Bleaching, February 2010

Journal articles
Skills Gap Offers Good News, Bad News, Frontline Focus, Volume 6, Issue 4

Frontline Focus, April 2010

Journal articles
Tips and Tricks Using IR Cameras in Paper Mills, Frontline Focus, Volume 6, Issue 7

Frontline Focus, August 2010

Journal articles
Hydraulic Energy Thieves, Frontline Focus, Volume 6, Issue 8

Frontline Focus, September 2010

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