Nitrogen removal and aggregation characteristics of Pseudomonas aeruginosa YL and its application capacity for ammonium-rich wastewater treatment
Nitrogen removal and aggregation characteristics of Pseudomonas aeruginosa YL and its application capacity for ammonium-rich wastewater treatment
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铜绿假单胞菌YL的脱氮、聚集特性及其在富铵废水处理中的应用
DOI：
10.1016/j.jwpe.2021.102260
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发表时间：
2021-10
影响因子：
7
通讯作者：
Li Xiao-Tong
中科院分区：
文献类型：
--
作者：
Yang Lei;Cui Shen;Ren Yong-Xiang;Guo Lin-Kai;Liu Huan-Huan;Zhang Zhi-Hao;Tu Li-Xin;Wang Jia;Li Xiao-Tong
从活性污泥中分离纯化的铜绿假单胞菌YL，通过有效利用单一氮源和混合氮源，具有高效的同步硝化反硝化能力。用Gompertz模型(R2>；(0.99))进行动力学分析，揭示了氮素降解的最佳条件，并提出其反硝化途径为序贯异养硝化-好氧反硝化过程。以NH4+-N为氮源时，菌株YL具有较高的絮凝能力、相对疏水性和较低的负电荷，充分证明了该菌株在异养硝化过程中具有较强的聚集能力。通过对胞外聚合物组成变化的讨论，解释了细胞聚集体的形成机理，并表明胞外聚合物与生物絮凝具有明显的相关性。此外，YL菌株在序批式反应器中对营养物质的去除能力强，功能菌株的存在稳定性好，以及良好的絮凝沉淀性能，进一步证实了YL菌株在处理富氨氮废水方面的良好潜力。
PseudomonasaeruginosaYL, which was isolated and purified from activated sludge, performed a high-efficiency simultaneous nitrification and denitrification ability through the efficient utilization of sole and mixed N-sources. Kinetics analysis carried out by Gompertz model (R2> 0.99) explicated the optimal condition of N-degradation, and its denitrification pathway was proposed as a sequential heterotrophic nitrification-aerobic denitrification process. Moreover, strain YL had higher flocculating ability, relative hydrophobicity and lower negative charges when NH4+-N used as N-source, which fully proved the stronger aggregation ability of the isolate during heterotrophic nitrification process. The formation mechanism of cell aggregates was explained by discussing the variations of extracellular polymeric substances (EPS) components, and exhibited an obviously relevance of EPS and bioflocculation. Furthermore, the great nutrients removal, stable existence of functional strain and the excellent flocculation-sedimentation performance in a sequencing batch reactor, further confirmed the good potential of strain YL for treating ammonium-rich wastewater.
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