ANAEROBIC BIODEGRADABILITY OF PLASTIC GARBAGE BAGS BASED ON STARCH POLYMER AND ALIPHATIC POLYESTER

Recently, there have been growing interests in biodegradable plastics to solve environmental problems caused by plastic wastes. Biodegradable plastics are made of high molecular compound, which is biodegraded by microorganisms and primarily transformed to CH4, CO2 and H2O. Biodegradable plastic had not been widely used because of high cost. However, continuous researches about raw materials make it possible to mass-produce and fall the cost of biodegradable plastic goods.

The anaerobic biodegradability of two types of biodegradable plastic garbage bag made of starch polymer and aliphatic polyester was evaluated. The anaerobic biodegradability was estimated by the amount of cumulative CH4 production. The sufaces of the specimens were observed with FE-SEM at the beginning of the test to compare with those of the specimens at the end of the test. The results of cumlative CH4 productions suggest that the starch polymer garbage bag was more biodegradable than the aliphatic polyester garbage bag tested in this study. However, both of their biodegradabilities were lower than expected. According to the observed CH4 production rates, it takes about 400 days to be biodegraded ultimately for the starch polymer garbage bag and about 3,000 days for the aliphatic polyester garbage bag. For the further research, the experiment is operating continuosly until the CH4 production is stopped. And the mass balance will be evaluated at the end of the experiment. The additional research is useful to investigate the phase of anaerobic digestion for the biodegradable plastic garbage bags.



Copyright: © IWWG International Waste Working Group
Quelle: Specialized Session D (Oktober 2007)
Seiten: 7
Preis: € 7,00
Autor: M.J. Kim
Han Seock Cho
Ph.D. Joung Yeon Kim

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