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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
Open Access
Impact of pulp chemical composition on recycling, TAPPI JOURNAL, December 1998, Vol. 81(12)

Impact of pulp chemical composition on recycling, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
Representative groundwater sampling using low-flow methods, TAPPI JOURNAL, December 1998, Vol. 81(12)

Representative groundwater sampling using low-flow methods, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
A comparison of recovery boiler field experiments using various nox reduction methods, TAPPI JOURNAL, December 1998, Vol. 81(12)

A comparison of recovery boiler field experiments using various nox reduction methods, TAPPI JOURNAL, December 1998, Vol. 81(12)

Magazine articles
Open Access
1998 international chemical recovery conference, TAPPI JOURNAL, December 1998, Vol. 81(12)

1998 international chemical recovery conference, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
A performance analysis of north american pulp, paper and packaging companies, TAPPI JOURNAL, December 1998, Vol. 81(12)

A performance analysis of north american pulp, paper and packaging companies, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
The Importance of Distribution Statistics in the Characterization of Chip Quality, TAPPI JOURNAL, February 1998, Vol. 81(2)

The Importance of Distribution Statistics in the Characterization of Chip Quality, TAPPI JOURNAL, February 1998, Vol. 81(2)

Journal articles
Open Access
Effect of Tertiary Coagulation and Flocculation Treatment on Effluent Quality from a Bleached Kraft Mill, TAPPI JOURNAL, February 1998, Vol. 81(2)

Effect of Tertiary Coagulation and Flocculation Treatment on Effluent Quality from a Bleached Kraft Mill, TAPPI JOURNAL, February 1998, Vol. 81(2)

Journal articles
Open Access
Application of Modular Computer Simulation for VOC Prediction in Development of Pulp and Paper Mill Closure Technology, TAPPI JOURNAL, February 1998, Vol. 81(2)

Application of Modular Computer Simulation for VOC Prediction in Development of Pulp and Paper Mill Closure Technology, TAPPI JOURNAL, February 1998, Vol. 81(2)

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