Int. J. Mol. Sci. 2009, 10(9), 3824-3835; doi:10.3390/ijms10093824
Article

Anaerobic Biodegradation Tests of Poly(lactic acid) under Mesophilic and Thermophilic Conditions Using a New Evaluation System for Methane Fermentation in Anaerobic Sludge

National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
* Author to whom correspondence should be addressed.
Received: 31 July 2009; in revised form: 27 August 2009 / Accepted: 31 August 2009 / Published: 2 September 2009
(This article belongs to the Special Issue Biodegradability of Materials)
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Abstract: Anaerobic biodegradation tests of poly(lactic acid) (PLA) powder were done at the thermophilic (55 °C) and mesophilic temperature (35 °C) under aquatic conditions [total solid concentrations of the used sludge were 2.07% (at 55 °C) and 2.24% (at 35 °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 °C. On the other hand, the PLA degradation started in 55 days at 35 °C and degradation rate was much slower than at 55 °C.
Keywords: anaerobic biodegradation; poly (lactic acid); methane fermentation

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MDPI and ACS Style

Yagi, H.; Ninomiya, F.; Funabashi, M.; Kunioka, M. Anaerobic Biodegradation Tests of Poly(lactic acid) under Mesophilic and Thermophilic Conditions Using a New Evaluation System for Methane Fermentation in Anaerobic Sludge. Int. J. Mol. Sci. 2009, 10, 3824-3835.

AMA Style

Yagi H, Ninomiya F, Funabashi M, Kunioka M. Anaerobic Biodegradation Tests of Poly(lactic acid) under Mesophilic and Thermophilic Conditions Using a New Evaluation System for Methane Fermentation in Anaerobic Sludge. International Journal of Molecular Sciences. 2009; 10(9):3824-3835.

Chicago/Turabian Style

Yagi, Hisaaki; Ninomiya, Fumi; Funabashi, Masahiro; Kunioka, Masao. 2009. "Anaerobic Biodegradation Tests of Poly(lactic acid) under Mesophilic and Thermophilic Conditions Using a New Evaluation System for Methane Fermentation in Anaerobic Sludge." Int. J. Mol. Sci. 10, no. 9: 3824-3835.

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