Paper360 - November/December 2017 - 43

Addition of solids-fly ash and wood fines-
reduces cracking of biosludge samples during
drying. More cracking occurs with fly ash
because wood fines are more rigid, providing
more support for sludge.

dewatering and drying characteristics. Most
biosludge is landfilled or incinerated, and
some is used as a soil amendment. To incinerate biosludge, mills mix it with primary
sludge, mechanically dewater the mixture
to 15-30 percent solids, and burn it with hog
fuel in biomass boilers. For biosludge to burn
effectively, however, it must be dewatered or
dried to at least 30-35 percent solids.
Researchers conducted a systematic
study to examine the drying characteristics

of biosludge collected from pulp and paper
mills at various temperatures using a thermogravimetric dryer. The drying behavior
of the tested biosludges was similar, adding
fillers such as wood fines and biomass boiler
fly ash to biosludge up to 30 wt percent did
not significantly affect the drying rate, higher
organic content might make biosludge more
difficult to dry, and increasing drying temperature significantly increases the drying
rate as expected.
This research shows that mills can optimize their biosludge handling and disposal
practices by understanding the material's
drying characteristics.
PAPERMAKING
Modeling the influence of forming
fabric structure on vacuum
box dewatering
Björn Sjöstrand, Christophe Barbier,
and Lars Nilsson
This investigation used numerical models to describe forming section sheet dewa-

Works great
on paper.

tering at the high vacuum suction boxes.
Three different fabric structures were
examined with numerical models for single-phase flow of air and for two-phase flow
of air and water. This was done to evaluate
how forming fabric structure influences
sheet dewatering.
The numerical models were compared
with an experimental study of the same
fabrics investigated on a laboratory suction
box. The small differences in dewatering
rate in the experimental study could be simulated with the models, which confirmed
the validity of the models. This implies
that these numerical models can be used
to describe new fabrics and how they will
respond in the papermaking process.
This investigation shows how numerical
models can be used by manufacturers of
paper machine clothing to obtain insights
into how forming fabrics influence dewatering processes without investments in
laboratory equipment and time-consuming
experimental work.

Essco's best-in-class doctor blades, holders,
and maintenance programs help some of the
world's largest and fastest paper machines
deliver consistent, trouble-free performance.
It's a doctor solution that literally works great on
paper. And it's not bad for your bottom line either.
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Paper360º NOVEMBER/DECEMBER
20171:01 am
09/06/16

43


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Table of Contents for the Digital Edition of Paper360 - November/December 2017

Setpoint
Over the Wire
Rebuilds and Conversions
Proud to be a Papermaker
The New Cascades
Operational Data Helps Mills Meet Challenges
Papermaking Best Practices with Vacuum-Dewatering Systems: Part 2
TAPPI Library is an Industry Resource
Managing the Decline of Graphic Paper Demand
TAPPI Journal Summaries
2017 PPI Awards Finalists
TAPPI News
ASPI News
Index of Advertisers
Paper360 - November/December 2017 - Intro
Paper360 - November/December 2017 - cover1
Paper360 - November/December 2017 - cover2
Paper360 - November/December 2017 - 3
Paper360 - November/December 2017 - 4
Paper360 - November/December 2017 - 5
Paper360 - November/December 2017 - Setpoint
Paper360 - November/December 2017 - 7
Paper360 - November/December 2017 - Over the Wire
Paper360 - November/December 2017 - 9
Paper360 - November/December 2017 - 10
Paper360 - November/December 2017 - 11
Paper360 - November/December 2017 - Rebuilds and Conversions
Paper360 - November/December 2017 - 13
Paper360 - November/December 2017 - 14
Paper360 - November/December 2017 - 15
Paper360 - November/December 2017 - 16
Paper360 - November/December 2017 - 17
Paper360 - November/December 2017 - 18
Paper360 - November/December 2017 - 19
Paper360 - November/December 2017 - 20
Paper360 - November/December 2017 - 21
Paper360 - November/December 2017 - 22
Paper360 - November/December 2017 - 23
Paper360 - November/December 2017 - Proud to be a Papermaker
Paper360 - November/December 2017 - 25
Paper360 - November/December 2017 - 26
Paper360 - November/December 2017 - 27
Paper360 - November/December 2017 - 28
Paper360 - November/December 2017 - 29
Paper360 - November/December 2017 - The New Cascades
Paper360 - November/December 2017 - 31
Paper360 - November/December 2017 - 32
Paper360 - November/December 2017 - 33
Paper360 - November/December 2017 - Operational Data Helps Mills Meet Challenges
Paper360 - November/December 2017 - 35
Paper360 - November/December 2017 - 36
Paper360 - November/December 2017 - 37
Paper360 - November/December 2017 - Papermaking Best Practices with Vacuum-Dewatering Systems: Part 2
Paper360 - November/December 2017 - 39
Paper360 - November/December 2017 - Managing the Decline of Graphic Paper Demand
Paper360 - November/December 2017 - 41
Paper360 - November/December 2017 - TAPPI Journal Summaries
Paper360 - November/December 2017 - 43
Paper360 - November/December 2017 - 44
Paper360 - November/December 2017 - 45
Paper360 - November/December 2017 - 2017 PPI Awards Finalists
Paper360 - November/December 2017 - 47
Paper360 - November/December 2017 - TAPPI News
Paper360 - November/December 2017 - ASPI News
Paper360 - November/December 2017 - Index of Advertisers
Paper360 - November/December 2017 - cover3
Paper360 - November/December 2017 - cover4
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