| Titre : |
Laboratory techniques for estimating the design and performance characteristics of pressure filters |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Davies-Venn, Auteur ; J. David Eye, Auteur |
| Année de publication : |
1985 |
| Article en page(s) : |
p. 63-80 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Laboratory procedures and mathematical models routinely used for sizing vacuum filters were evaluated and modified to permit their use in sizing pressure filters for sludge dewatering. The results obtained on a tannery sludge gave a linear relationship between predicted and observed filter yields for a bench-scale pressure filter.
A modified mathematical model was developed for calculating the filter yield and for sizing full-scale pressure filters based on laboratory studies. These same laboratory procedures can also be used determining the optimum chemical conditioning required for obtaining the maximum sludge dewatering capability from an operating pressure filter.
Some of the more important filtration variables which affect the performance of pressure filters were investigated statistically. It was found that the specific resistance and the suspended solids content of the sludge were the most significant. The pressure filter cake solids content (dryness) varied directly with the pressing time per unit of cake thickness while the filter yield in pounds of dry solids per hour per square foot of filter area was inversely proportional to the dryness (cake solid content) of the filter cake. These observations stem from the fact that increased pressing time removed additional water from the weight of sludge solids in the filter chamber.
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in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXX (Année 1985) . - p. 63-80
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