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2004
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In the Laboratory
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A Simple Flotation De-Inking Experiment for the Recycling of Paper
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Richard A. Venditti
Department of Wood and Paper Science, North Carolina State University, Raleigh, NC 27695-8005
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May 2004
Vol. 81 No. 5
p. 693
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| Abstract |
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Flotation de-inking technology is used in the paper recycling process to preferentially remove hydrophobic contaminants, such as inks and toners from a slurry of fibers in water. In the process fine air bubbles are introduced into the suspension and the hydrophobic contaminants, preferentially attached to the bubble–water interface, are carried to the top of the flotation vessel and are skimmed away in a reject stream. Clean fibers are taken from another port of the vessel as the accept stream. This short article describes a simple, inexpensive method to execute in the laboratory a batch type flotation de-inking process on wastepaper. In the experiment, wastepaper is dispersed in water and then de-inked using a laboratory flotation apparatus readily assembled from common lab equipment. The product streams are collected on filter paper to determine the contaminant removal efficiency and the fiber yield. The experiment is useful for middle or high school science courses or introductory-level college environmental, chemical engineering, or chemistry courses in need of a simple experiment that demonstrates, for example, concepts in separation technology, surface science, or mass balances. A host of complementary information pertaining to the manufacturing and recycling of paper and many other paper making and paper recycling activities can be found at the following
Web site.
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| Supplement |
A detailed version of the laboratory experiment, including questions and further activities, are available.
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 Contents |
JCE2004p0693W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Venditti, Richard A. J. Chem. Educ. 2004 81 693.
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Keywords |
Chemical Engineering; Demonstrations; Environmental Chemistry; General Chemistry; Industrial Chemistry; Introductory / High School Chemistry; Laboratory Instruction; Physical Chemistry; Separation Science; Surface Science
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History |
Created:
Last Updated: |
April 1, 2004
February 18, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
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