Accelerated evaluation of biodegradability in seawater by activated inoculum

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  • 微生物の高活性化による海洋生分解性評価の加速化
  • ビセイブツ ノ コウカッセイカ ニ ヨル カイヨウ セイブンカイセイ ヒョウカ ノ カソクカ

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<p>One of the solutions to the problem of marine plastic pollution is utilization of marine biodegradable plastics. Evaluation of biodegradability of a plastic material in marine is essential for development of marine biodegradable plastics. The evaluation of biodegradability in laboratory has some issues such as reproducibility and variability of the test, and long test period. The authors examined the method for accelerated evaluation of biodegradability in seawater by activation of the inoculum at the beginning of the test. In laboratory, microbial activity and viable count decreased with incubation time. Furthermore, the biodegradation activity of the inoculum was reduced. The biodegradation activity was improved by the seawater with microorganisms extracted from sediment. Moreover, the addition of nutrients to the inoculum accelerated biodegradation. The bacterial flora of the biofilm on the samples after the biodegradation test was similar between in the field and in the laboratory. Therefore, it was confirmed that the laboratory evaluation could simulate the degradation in field conditions. In laboratory evaluations, the origin of the inoculum and the season of collection affect the results of the marine biodegradation. Even the microbial activity was low, it is expected that the biodegradability can be accelerated by the seawater with microorganisms extracted from sediment.</p>

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