Novel methods for monitoring the sludge dewatering operation of a belt filter: a mill study
-
Markku Kuosa
and
Riku Kopra
Abstract
During recent decades the quality of pulp and paper mill sludge has changed. This has awakened the need for an applicable means to observe the sludge dewatering process diversely and accurately. To maximize the solids content and energy efficiency of board mill sludge dewatering, different process monitoring options were studied. Novel methods for monitoring the sludge dewatering operation of a belt filter were tested. Continuous run-time measurements and test response experiments were carried out at a board mill site. IR transmittance measurement through the filter web and sludge mat thickness measurement using a light curtain turned out to be very promising techniques. IR transmittance responded to the polymer content of the sludge without a notable time lag, while the solid content measurement of the filtrate did not give a measurable response.
Funding statement: This work was financed by European Regional Development Fund (ERDF) via South Savo Center for Economic Development, Transport and the Environment (ELY Center). Thanks to Metsä Board Oyj, Aquaflow Oy and other partner companies for support.
Acknowledgments
The authors thank Liz Dexter for editing the manuscript and thank Anu Pihlajaniemi and Hanna Laukkanen for helping with the data analysis. The authors are grateful to all participants involved in with this study.
Conflict of interest: The authors declare no conflicts of interest.
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Articles in the same Issue
- Frontmatter
- Review
- A broad overview on innovative functionalized paper solutions
- Chemical pulping
- Suitability of eight years kadam tree (Neolamarckia cadamba) in chemical pulping
- Bleaching
- Using Oxone and TAED activator in non-chlorine bleaching of soda bagasse pulp
- Impact of dissolved organic matter in D0- and AD0-stages in bleaching of birch kraft pulp
- Paper technology
- Effects of a stylus on the surface roughness determination in a contact method for paper and paperboard
- Structure analysis of three non-wood materials for liner paper
- Paper chemistry
- The influences of chlorhexidine and modified galactomannan additions on the physical and antibacterial properties of paper
- Optimization of the process variables for treating cellulose fiber with NaOH/urea aqueous solution for improved water retention value and paper strength
- The application of organosilicon modified polyurethane in reinforcing traditional paper
- Effect of ionic liquid pretreatment on paper physical property and pulp refining performance
- Coating
- Antibacterial effect of Ag nanoparticles into the paper coatings
- Facile fabrication of hydrophobic cellulosic paper with good barrier properties via PVA/AKD dispersion coating
- Printing
-
Enhanced ink-absorption performance of inkjet printing paper-based patterns with core-shell-structure
- Application of gradient method for separately analyzing optical and mechanical dot gain of electrophotography prints
- Effect of the paper surface properties on the ink transfer parameters in offset printing
- Environmental impact
- Novel methods for monitoring the sludge dewatering operation of a belt filter: a mill study
- Lignin
- Structural characterization of the bagasse lignin pretreated using solid alkali
