Analysis of microbial community structure in the sediment of multi-stage purification ponds for swine wastewater treatment systems
To explore the structure of microbial communities in the sediment of multi-stage purification pools within pig farm wastewater treatment systems and their interactions with environmental factors in the sediment,a multi-stage biological treatment and purification system was constructed,including Myriophyllum verticillatum L(T1),Pistia stratiotes L(T2),Azolla pinnata(T3),Misgurnus anguillicaudatus(T4),Pampus argenteus(T5),and Nelumbo nucifera Gaertn(T6).After six months of operation,the results of determining the physicochemical indicators of the sediment and the structure of the microbial community showed that throughout all purification stages,the Proteobacteria phylum consistently dominated the sediment;the Actinobacteriota and Firmicutes were more abundant in the initial treatment stage(T1)and significantly reduced in subsequent treatment pools.The relative abundance of Cyanobacteria,Acidobacteriota,and Desulfobacterota fluctuated greatly.In-depth analysis revealed that organic matter and total phosphorus were key environmental factors affecting the structure of microbial communities,with the content of organic matter showing a significant positive correlation with the abundance of unclassified genera of Syntrophales,Gaiellales,and Spirochaeta.Additionally,the denitrifying bacterium Candidatus Competibacter played a central role in the nitrogen cycle of the system.Therefore,the purification efficiency of the sewage treatment system can be improved by screening and using these specific functional bacteria for bioenhancement.
国家科技期刊平台
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