Synergistic effects of a functional bacterial consortium on enhancing phenanthrene biodegradation and counteracting rare earth biotoxicity in liquid and slurry systems.
Synergistic effects of a functional bacterial consortium on enhancing phenanthrene biodegradation and counteracting rare earth biotoxicity in liquid and slurry systems.
复制标题
功能性细菌群落对增强菲生物降解和抵消液体和浆料系统中稀土生物毒性的协同作用。
DOI：
10.1111/lam.13817
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Tao Pan
中科院分区：
文献类型：
--
作者：
Meini Wang;Congyang Liu;Jiameng Zhang;Kun Xiao;Tao Pan
The biodegradation of polycyclic aromatic hydrocarbons (PAHs) by micro-organisms in the environment is often inhibited by coexisting metal ions. The aim of this work is to study a bacterial consortium for enhancing phenanthrene biodegradation under the inhibition effect of the rare earth (RE) ions Ce3+ and Y3+ . This bacterial consortium was composed of two bacteria, namely, the RE-adsorbing Bacillus subtilis MSP117 and the phenanthrene-degrading Moraxella osloensis CFP312. Ce3+ and Y3+ at the concentration of 1·15 mmol l-1 inhibited CFP312 from degrading phenanthrene but not glucose. Using glucose as a co-substrate could promote the proliferation of CFP312 but decreased phenanthrene degradation. Adsorption experiments and electron microscopy imaging showed that CFP312 had no RE ions adsorption capacity for RE ions and that RE elements could not be observed on its cell surfaces. MSP117 could adsorb 0·14 and 0·12 mmol g-1 wet cells of Ce3+ and Y3+ in aqueous solution, respectively, thus demonstrating considerable adsorption capacity. The MSP117 cell surface immobilized part of the free RE ions and reduced their bioaccessibility, thereby alleviating their biotoxic effect on phenanthrene degradation by CFP312. In liquid and slurry systems, glucose, which was used as the co-substrate of the bacterial consortium, must be kept at a low level to avoid the catabolism repression of phenanthrene degradation by CFP312.
