Integrated approach to enhance the anaerobic biodegradation of benz[a] anthracene: A high -molecule-weight polycyclic aromatic hydrocarbon in sludge by simultaneously improving the bioavailability and microbial activity
Integrated approach to enhance the anaerobic biodegradation of benz[a] anthracene: A high -molecule-weight polycyclic aromatic hydrocarbon in sludge by simultaneously improving the bioavailability and microbial activity
复制标题
通过同时提高生物利用度和微生物活性来增强苯并[a]蒽厌氧生物降解的综合方法：污泥中的一种高分子量多环芳烃
DOI：
10.1016/j.jhazmat.2018.11.012
复制
发表时间：
2019-03-05
影响因子：
13.6
通讯作者：
Cao, Jiashun
中科院分区：
文献类型：
--
作者：
Luo, Jingyang;Wu, Lijuan;Cao, Jiashun
在废弃活性污泥厌氧发酵过程中，通过碱性和烷基多糖(APG)的组合处理，提高了苯并菲(BAA)的生物降解性。在pH 10和pH 10&APG反应器中，BAA的降解率分别由对照的14.1%提高到30.2%和47.8%。机理研究发现，碱处理和APG处理促进了BAA从污泥中解吸和向微生物转移/进入的过程，最终提高了BAA的生物利用率。同时，释放出的大量底物不仅作为碳源，还参与了微生物之间的电子传递，促进了BAA的生物降解过程。此外，碱性和APG处理也提高了参与BAA降解的微生物的活性，包括功能细菌的数量、酶的活性和基因的数量。总体而言，BAA生物利用度和微生物活性的同步提高提高了其生物降解效率。
The biodegradation of benz[cdanthracene (BaA), which was a high-molecule-weight PAH, was enhanced via a combination of alkaline and alkyl polyglucosides (APG) treatment during waste activated sludge (WAS) anaerobic fermentation. The biodegradation efficiency of BaA was increased from 14.1% in the control to 30.2 and 47.8% in pH 10 and pH 10 & APG reactors, respectively. Mechanism investigations found that the alkaline and APG treatments stimulated the processes of BaA desorption from sludge and transfer/entry into microorganisms, and ultimately improved the BaA bioavailability. Meanwhile, the huge released substrates from WAS not only served as carbon sources but also involved in the electron transfer among microorganisms which contributed to the BaA biodegradation process. Moreover, the microbial activities involved in BaA biodegradation, including the abundances of functional bacteria, activities of enzymes and quantities of genes, were also incremented due to the alkaline and APG treatments. Overall, the simultaneous improvement of BaA bioavailability and microbial activities enhanced its biodegradation efficiency.