Promotion of polylactide degradation by ammonia under hyperthermophilic anaerobic conditions.
Promotion of polylactide degradation by ammonia under hyperthermophilic anaerobic conditions.
复制标题
DOI：
10.1016/j.biortech.2011.08.060
复制
发表时间：
2011-11
影响因子：
11.4
通讯作者：
Feng Wang;H. Tsuno;T. Hidaka;J. Tsubota
中科院分区：
文献类型：
--
作者：
Feng Wang;H. Tsuno;T. Hidaka;J. Tsubota
研究了在超高温（80°C）和高温（55°C）厌氧条件下，氨对聚乳酸（PLA）生物降解的促进作用。结果表明，在超高温条件下，聚乳酸转化为乳酸，但在高温条件下转化率可以忽略不计。氨的添加和微生物的活性可以显著提高水解过程。在投加4gN/L氨氮处理厌氧污泥3d的条件下，两种聚乳酸的最大转化率分别为65.2%和51.8%。超高温预处理后的水解产物在高温厌氧条件下被产甲烷菌转化为甲烷。两种PLA处理22天后的甲烷转化率分别为81.8%和77.0%。
The objective of this study was to evaluate the promotion effect of ammonia on the biodegradation of polylactide (PLA) under hyperthermophilic (80°C) and thermophilic (55°C) anaerobic condition. The results showed that PLA was transformed to lactic acid under hyperthermophilic conditions, but that the transformation ratio was negligible under thermophilic conditions. The hydrolysis process can be markedly increased with ammonia addition and microorganism activity. The maximum transformation ratios of the two kinds of PLA used in this study were 65.2% and 51.8%, respectively, with ammonia addition of 4gN/L over 3days treatment of anaerobic sludge. After the hyperthermophilic pretreatment, the hydrolysis products were converted to methane by methanogens under the thermophilic and anaerobic conditions. The final methane conversion ratios of the two kinds of PLA after 22days treatment were 81.8% and 77.0%, respectively.