Denitrification Driving by Immobilization Mixed-Culture Denitrifying Fungal Communities under Aerobic Conditions: Community Co-Occurrence Pattern, and Low C/N Micro-Polluted Water Treatment

Ma Ben,Niu Limin,Haihan Zhang,Shengnan Chen,Tinglin Huang,Liu Hanyan,Sixuan Pan, Hu Liu, Xiaoli Zhang

crossref（2023）

Cited 0|Views17

Abstract

Less attention focused on the nitrogen removal performance of mixed-culture aerobic denitrifying fungal flora (mixed-CADFF) in the low C/N polluted water bodies. In this study, three mixed-CADFF were separated from urban lake overlying water. The total nitrogen (TN) removal efficiencies were 93.60%, 94.64%, and 95.18%, respectively for mixed-CADFF LN3, LN7, and LN15. Meanwhile, the dissolved organic carbon removal efficiencies were 96.64%, 95.12%, and 96.70%, respectively for mixed-CADFF LN3, LN7, and LN15. Three mixed-CADFFs could utilize diverse types of low molecular weight carbon sources to drive the aerobic denitrification processes efficiently. The high-throughput sequencing analysis of three mixed-CADFFs based on ITS specific primer indicated that Eurotiomycetes, Cystobasidiomycetes, and Sordariomycetes were the dominant phylum of three mixed-CADFFs. The network analysis presented that the rare species (Scedosporium dehoogii Saitozyma, and Candida intermedia) presented positive co-occurrence with the TN and organic matter removal. Immobilization mixed-CADFFs treatment raw water experiments indicated that three mixed-CADFFs could reduce more than 27.72%, and 62.73% of TN, respectively for reservoir water and urban lake water. Meanwhile, the cell density and cell metabolism indexes were also increased during the raw water treatment. This study will provide new insight into utilization for the mixed-CADFFs in the environment reparation field.

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【要点】：本研究探讨了混合培养的好氧反硝化真菌群落（mixed-CADFF）在低C/N微污染水体中的氮素去除性能，并揭示了其在处理过程中的群落共现模式和效能。

【方法】：通过从城市湖泊表层水中分离出三种mixed-CADFF，并使用高效液相色谱-质谱联用技术（HPLC-MS）和基于ITS特异性引物的高通量测序分析其群落结构和功能。

【实验】：在实验中，三个mixed-CADFF（LN3、LN7和LN15）对总氮（TN）的去除效率分别达到了93.60%、94.64%和95.18%，对溶解性有机碳的去除效率分别达到了96.64%、95.12%和96.70%。采用高通量测序分析发现，Eurotiomycetes、Cystobasidiomycetes和Sordariomycetes是三个mixed-CADFF的优势门类。通过对原水处理实验的研究，表明固定化的mixed-CADFFs能分别降低水库水和城市湖水中的TN含量27.72%和62.73%。同时，在原水处理过程中，细胞密度和细胞代谢指数也有所增加。