| Project/Area Number |
09650602
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Osaka University |
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Principal Investigator |
FUJITA Masanori (1998) Osaka University, Department of Environmental Engineering Professor, 工学研究科, 教授 (70029289)
池 道彦 (1997) 大阪大学, 工学部, 講師 (40222856)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Kazuhiro Osaka University, Department of Environmental Engineering Research Associate, 工学研究科, 助手 (90294040)
藤田 正憲 大阪大学, 工学部, 教授 (70029289)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | PVA-starch blend plastic / Acetate cellulose plastic / PVAoxidase / Amylase / Lipase / Cellulase / UV irradiation / Accelerated degradation / ポリビニルアルコール-デンプン系プラスチック / 紫外線処理 / ポリビニルアルコール分解酵素 / 分解加速化 / 酢酸セルロース |
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| Research Abstract |
Attempts were made to accelerate the degradation of an polyvinyl alcohol (PVA)-starch blend plastic, Mater-bi AF10H, by applying starch- and PVA-degrading bacteria and enzymes.Mater-bi degradation tests by an activated sludge, simulating its degradation in natural environment, resulted in the ultimate weight loss of less than 40 % and no film breakage.Applications of a starch-degrading bacterium and a-amylase caused more rapid and extensive weight loss (max. 50 %) than the activated sludge, however the apparent film breakage was not also observed.On the other hand, when a PVA-degrading bacterium or enzyme was applied, a maximal weight loss of ca. 70 % was achieved and film breakage occurred.The enzyme application was especially effective, and led to the film fragmentation into small pieces within 10 days under an optimal condition.These suggested that the degradation of PVA fraction is important and requisite for complete degradation of Mater-bi.On the other hand, an acetate cellulose plastic could not be degraded by applying lipase and/ or cellulase enzymes.However, when it was tre-treated by UV irradiation, about 60 % of weight loss was performed at an optimal condition.As a conclusion, this is a great success for accelerating degradation of green plastics, leading also to acceleration of reduction and recycling of solid wastes.
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