Analysis of Papermaking Process Waters and Effluents

  • B. Holmbom
Part of the Springer Series in Wood Science book series (SSWOO)

Abstract

Not only pulping, but also papermaking, involves complex chemical phenomena. Dissolved and colloidal substances are released into process waters from pulps and are carried over to papermaking operations. This material represents a multitude of different components, which interact with one another and with the pulp fibers, fillers, and process chemicals at the wet end of the paper machine. Along with the trend of minimizing the use of fresh water until the water system is nearly a closed cycle, the concentrations of dissolved and colloidal substances are increasing in papermaking waters. The highly turbulent conditions, the varying pH, and the presence of microorganisms are further factors to be taken into account when managing the wet-end chemistry. This is of critical importance, both for paper machine runnability and paper quality. Furthermore, these dissolved and colloidal substances will end up in the mill effluents, if not carried with the paper or taken out in the form of solid rejects.

Keywords

Silicate Carbohydrate Sludge Fractionation Turbidity 

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© Springer-Verlag Berlin Heidelberg 1999

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  • B. Holmbom

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