期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 406, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124285
关键词
Papermaking black liquor; Bioremediation; Thermophilic and alkali-tolerant bacterium; Detoxification; Environmental safety
资金
- National Natural Science Foundation of China [31660024]
- Key Research and Development Program of Jiangxi Province [20192BBF60055]
- Key Science and Technology Project of Jiangxi Provincial Department of Education [GJJ180174]
- Science and Technology Research Project of Jiangxi Provincial Department of Education [9232307656]
The study successfully improved the biodegradation efficiency of lignin by a new isolated thermophilic and alkali-tolerant strain Serratia sp. AXJ-M using PB experimental design combined with RSM, suggesting its potential for bioremediation applications for papermaking black liquor. GC-MS analysis showed a decrease in concentration of low-molecular-weight compounds after biological treatment. Toxicological and genotoxicity studies supported the detoxification by the bacterium of black liquor.
There is a great need for efficiently treating papermaking black liquor because it can seriously pollute both soil and water ecosystems. In this study, the Plackett-Burman (PB) experimental design combined with response surface methodology (RSM) was used for improving the biodegradation efficiency of lignin by a new isolated thermophilic and alkali-tolerant strain Serratia sp. AXJ-M, and the results showed that a biodegradation efficiency of 70.5% was achieved under optimal culture conditions. The bacterium with ligninolytic activities significantly decreased target the parameters (color 80%, lignin 60%, phenol 95%, BOD 80% and COD 80%). The control and treated samples were analyzed by gas chromatography-mass spectrometer (GC-MS), which showed that the concentrations of a majority of low-molecular-weight compounds were decreased after biological treatment. Furthermore, toxicological, genotoxicity and phytotoxicity studies have supported the detoxification by the bacterium of black liquor. Finally, the genome sequence of the thermophilic, alkali-tolerant and lignin degrading bacterium AXJ-M was completed, and the genetic basis of the thermophilic and alkali-resistant properties of AXJ-M was preliminarily revealed. The dyp-type peroxidase was first reported to have the potential to catalyze lignin degradation structurally. These findings suggest that Serratia sp. AXJ-M may be potentially useful for bioremediation applications for papermaking black liquor.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据