Microbiological changes in water bodies during continuous natural mixing and the impact on water quality improvement
In recent years,large and medium-sized reservoirs have gradually become the main source of drinking water for cities,raising concerns about water safety,particularly regarding its quality.In situ experiments have demonstrated that the Water-lifting and aeration systems(WLAs)can disrupt the stratification of reservoir water bodies and artificially induce water bodies to enter the natural mixing period 2.5 months earlier than those without human intervention.Nevertheless,there is a paucity of comprehensive research investigating the relationship between alterations in biological characteristics(carbon metabolism activity,community structure and diversity)and the enhancement of water quality in water bodies during the sustained natural mixing period.To address this issue,this study comprehensively investigated the spatial and temporal changes in water quality parameters,pollutant concentrations,bacterial carbon metabolic activity,species composition and microbial community symbiosis patterns in Lijiahe Reservoir during the sustained natural mixing period.At the onset of the sustained natural mixing period,the water column's bacterial community exhibited high abundance and carbon metabolism activity,both of which demonstrated a declining trend as the sustained mixing progressed.Throught the entire period of continuous natural mixing,the bacterial community structure in the water body was dominated by Actinobacteria and Ascomycetes,with the dominant genera being CL500-29_marine_group(26.65%)and hgcI_clade(18.21%).Symbiotic network analyses indicated that the interactions among bacterial communities were more complex and tightly knit during the early stages of sustained natural mixing.In contrast,redundancy analyses demonstrated that microbial population structure was co-regulated by environmental and water quality factors.Correlation analysis demonstrated a significant relationship between the functional microorganisms and water quality,with microorganisms exhibiting a positive influence on water quality improvement.The findings of this study will provide a scientific foundation for the in situ remediation of drinking water sources,with the objective of improving water quality.
drinking water reservoirscontinuous natural mixingbioaugmentationsymbiotic network analysiscontaminant removal
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