Comparison of the weight-loss degradability of various biodegradable plastics under laboratory composting conditions |
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Authors: | Akihito Ohtaki Kiyohiko Nakasaki |
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Institution: | (1) Department of Materials Science and Chemical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan Tel./Fax +81-53-478-1172 e-mail: tcknaka@ipc.shizuoka.ac.jp, JP |
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Abstract: | Eight kinds of biodegradable plastics were compared for their degradability in controlled laboratory composting conditions.
A thin film of each plastic was mixed into the composting material, and weight-loss degradability was calculated from the
weight changes of the film during composting. It was found that weight-loss degradability strongly depended on the specific
kind of biodegradable plastic; two were very high, four moderate, and the remaining two very slight. The most easily degradable
plastic degraded by as much as 81.4% over 8 days of composting. By comparing the weight-loss degradability with ultimate degradability,
which is defined as a molar ratio of carbon loss as CO2 to the carbon contained in the biodegradable plastic, the order of the ease of degradation of the biodegradable plastics
differed.
Received: February 7, 2000 / Accepted April 14, 2000 |
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Keywords: | Waste treatment Composting Biodegradable plastic Degradability Microorganisms |
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