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Int J Mol Sci. 2009 Sep 2;10(9):3824-35. doi: 10.3390/ijms10093824.

Anaerobic biodegradation tests of poly(lactic acid) under mesophilic and thermophilic conditions using a new evaluation system for methane fermentation in anaerobic sludge.

Author information

1
National Institute of Advanced Industrial Science and Technology, Higashi, Tsukuba, Ibaraki, Japan. h.yagi@aist.go.jp

Abstract

Anaerobic biodegradation tests of poly(lactic acid) (PLA) powder were done at the thermophilic (55 degrees C) and mesophilic temperature (35 degrees C) under aquatic conditions [total solid concentrations of the used sludge were 2.07% (at 55 degrees C) and 2.24% (at 35 degrees C)] using a newly developed evaluation system. With this system, the evolved biogas is collected in a gas sampling bag at atmospheric pressure. This method is more convenient than using a pressure transducer or inverted graduated cylinder submerged in water. PLA was degraded about 60% in 30 days, about 80% in 40 days and about 90% in 60 days at 55 degrees C. On the other hand, the PLA degradation started in 55 days at 35 degrees C and degradation rate was much slower than at 55 degrees C.

KEYWORDS:

anaerobic biodegradation; methane fermentation; poly (lactic acid)

PMID:
19865521
PMCID:
PMC2769157
DOI:
10.3390/ijms10093824
[Indexed for MEDLINE]
Free PMC Article

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