The Influence Of Aged Distilled Water On Pulp Pad Permeability

Authors

  • Roland Gertjejansen

Abstract

Past experience had shown that pulp pads permeated with aged distilled water always experienced a permeability decrease which was independent of the dissolved gas content. This loss could be regained, at least in part, by subsequent permeation with freshly distilled or filtered aged distilled water. The size of the blocking agent in aged distilled water was found to be between 1.2 and 5.0 microns, which falls within the size range determined by other workers for stable bubble nuclei in tap water. A dilute particle suspension exhibited a behavior identical to that of aged water, but microscopic analyses of filters showed no difference in the number of contaminants in freshly distilled or aged distilled water. Boiling (100 C) greatly reduced the deleterious effect of aged water. Although aged distilled water decreased pulp pad permeability, the specific filtration resistance of pulp slurries was not increased by aged distilled water and tap water when compared to freshly distilled water and filtered tap water. The presence of bubble nuclei would explain the effect of aged distilled water on pulp pad permeability, but how they are stabilized and why they develop is not known.

References

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Published

2007-06-22

Issue

Number 2 / Summer 1969

Section

Research Contributions

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