采用一种新的厌氧污泥甲烷发酵评价体系，在中温和高温条件下进行聚乳酸的厌氧生物降解试验。
Anaerobic biodegradation tests of poly(lactic acid) under mesophilic and thermophilic conditions using a new evaluation system for methane fermentation in anaerobic sludge.
机构信息
National Institute of Advanced Industrial Science and Technology, Higashi, Tsukuba, Ibaraki, Japan.
出版信息
Int J Mol Sci. 2009 Sep 2;10(9):3824-35. doi: 10.3390/ijms10093824.
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.
在水相条件下，使用新开发的评估系统，在嗜热（55°C）和中温（35°C）下对聚乳酸（PLA）粉末进行了厌氧生物降解测试[使用的污泥总固体浓度分别为 2.07%（在 55°C 下）和 2.24%（在 35°C 下）]。使用该系统，在大气压下将产生的沼气收集在气体采样袋中。与使用压力传感器或浸入水中的倒置刻度量筒相比，该方法更加方便。PLA 在 55°C 下约 30 天降解约 60%，40 天降解约 80%，60 天降解约 90%。另一方面，PLA 在 35°C 下 55 天开始降解，降解速度比 55°C 下慢得多。
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