Surface ozonation of polyvinyl chloride for its separation from waste plastic mixture by froth floatation |
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Authors: | Mallampati Srinivasa Reddy Tetsuji Okuda Keisuke Kurose Tsung-Yueh Tsai Satoshi Nakai Wataru Nishijima Mitsumasa Okada |
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Institution: | 1. Environmental Research and Management Center, Hiroshima University, 1-5-3 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8513, Japan 2. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan
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Abstract: | Selective surface modification of polyvinyl chloride (PVC) by ozonation was evaluated to facilitate the separation of PVC
from other heavy plastics with almost the same density as PVC, especially polyethylene terephthalate (PET), by the froth flotation
process. The optimum froth flotation conditions were investigated, and it was found that at 40°C, 90% of PVC and PET plastics
floated. The bubble size became larger and the area covered with bubbles on the plastic surface was reduced with increasing
temperature. Optimum PVC separation was achieved with the flotation solution at 40°C and mixing at 180–200 rpm, even for sheet
samples 10 mm in size. Combined treatment by ozonation and froth flotation is a simple, effective, and inexpensive method
for PVC separation from waste plastics. |
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