摘要
Reservoirs have been served as the major source of drinking water for dozens of years.The water quality safety of large andmedium reservoirs increasingly becomes the focus of public concern.Field test has proved that water-lifting and aeration system(WLAS)is a piece of effective equipment for in situ control and improvement of water quality.However,its intrinsic bioremediation mechanism,especially for nitrogen removal,still lacks in-depth investigation.Hence,the dynamic changes inwater quality parameters,carbon source metabolism,species compositions and co-occurrence patterns ofmicrobial communitieswere systematically studied in Jinpen Reservoir within a wholeWLAS running cycle.TheWLAS operation could efficiently reduce organic carbon(19.77%),nitrogen(21.55%)and phosphorus(65.60%),respectively.Biolog analysis revealed that the microbialmetabolic capacitieswere enhanced viaWLAS operation,especially in bottomwater.High-throughput sequencing demonstrated that WLAS operation altered the diversity and distributions of microbial communities in the source water.The most dominant genus accountable for aerobic denitrification was identified as Dechloromonas.Furthermore,network analysis revealed that microorganisms interacted more closely through WLAS operation.Oxidation-reduction potential(ORP)and total nitrogen(TN)were regarded as the two main physicochemical parameters influencing microbial community structures,as confirmed by redundancy analysis(RDA)and Mantel test.Overall,the results will provide a scientific basis and an effective way for strengthening the in-situ bioremediation of micro-polluted source water.
基金
This work was supported by the National Key Research and Development Program of China(No.2019YFD1100101)
the National Natural Science Foundation of China(No.51979217)
the Shaanxi Provincial Key Research and Development Program(No.2019ZDLSF06-03)
the Youth Innovation Team of Shaanxi Universities in 2020(PI:Dr.Haihan Zhang)
the Youth Innovation Team of Shaanxi Universities in 2021(No.21JP061).
