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Journal articles
Magazine articles
Open Access
A novel unit operation to remove hydrophobic contaminants, TAPPI Journal April 2020

ABSTRACT: For mills making paper with recovered fiber, removal of hydrophobic contaminants is essential for trouble-free operation of paper machines. Significant cost savings on paper machine operation can be achieved by reducing deposits, which results in better quality, reduced downtime, increased fiber yield, and reduced energy consumption. Bubble nucleation separation (BNS) is a relatively new process for removing hydrophobic particles. When vacuum is applied to a slurry, dissolved gas bubbles nucleate on hydrophobic particles and drag them to the surface for easy removal. We constructed a 16-L batch unit to evaluate the effect of operating parameters on removal of hydrophobic particles, using statistical design of experiments. These results were used to guide our design of a 16-L continuous unit. We tested this unit on laboratory and mill samples. The removal of 60%•80% of hydrophobic particles was achieved with a low reject rate of < 2%.Following on this success, we built a 200-L pilot unit and tested it in our pilot plant. With promising results there, we installed the pilot unit at a commercial paper recycling mill. Over the course of several mill trials, we showed that it was possible to remove a considerable amount of suspended solids from paper machine white water with less than 2% rejects. Unfortunately, due to the unit only treating 50 L/min and the mill flow being 12000 L/min, we were not able treat a sufficient portion of the white water to know whether a large-scale implementation of BNS would improve paper machine runnability.

Journal articles
Open Access
Making a case for small paper machines, TAPPI JOURNAL, April 2000, Vol. 83(4)

Making a case for small paper machines, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
Incremental tons - to make or not to make, that is the question, TAPPI JOURNAL, April 2000, Vol. 83(4)

Incremental tons - to make or not to make, that is the question, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
Prevention of core bursts, creping, and ribbons on jumbo rolls, TAPPI JOURNAL, April 2000, Vol. 83(4)

Prevention of core bursts, creping, and ribbons on jumbo rolls, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
High-energy, self-cleaning filtration system, TAPPI JOURNAL, April 2000, Vol. 83(4)

High-energy, self-cleaning filtration system, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
New findings of entrained air and dissolved gases in pm wet end: mill case study, TAPPI JOURNAL, April 2000, Vol. 83(4)

New findings of entrained air and dissolved gases in pm wet end: mill case study, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
Effects of white-water closure on the physical properties of linerboard, TAPPI JOURNAL, April 2000, Vol. 83(4)

Effects of white-water closure on the physical properties of linerboard, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
Development and validation of an improved drainage testing, TAPPI JOURNAL, April 2000, Vol. 83(4)

Development and validation of an improved drainage testing, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
Adhesion properties of polyamide fibers used in press, TAPPI JOURNAL, April 2000, Vol. 83(4)

Adhesion properties of polyamide fibers used in press, TAPPI JOURNAL, April 2000, Vol. 83(4)

Journal articles
Open Access
On the in-plane tear test, TAPPI JOURNAL, April 2000, Vol. 83(4)

On the in-plane tear test, TAPPI JOURNAL, April 2000, Vol. 83(4)

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