Response of microbial community structure to the hydrochemical evolution during riverbank filtration: a case study in Shenyang, China

Abstract

Microorganisms are widely involved in the transformation process of physical and chemical properties in the geological and hydrogeological environment. Active participation of microorganisms is important features of the biogeochemical reactions during groundwater exploiting along the riverbank filtration. Hydrodynamic condition has a direct or indirect difference control of the biological effectiveness, chemical activity and mobility of the pollution components, which can affect biogeochemical process. In different biogeochemistry, there will be some exclusive functional bacteria, which is of great significance to understand the biogeochemical mechanism of river water infiltration. This study confirms that there are two main different flow paths from river to the center of the depression cone due to different hydrodynamic conditions and spatial characteristics and scaling effects of redox zonation during riverbank filtration. In different flow paths, the microbial abundance shows obvious spatial heterogeneity. The microbial abundance and species similarity degree of the riverbed and deep flow path sediments has significant correlation. There is a significant correlation between the dominant bacteria and the environmental factors in different hydrodynamic conditions on a spatial scale. This study is the first to reveal the response of microbial community structure to water chemical evolution during riparian filtration. Due to significant positive correlation between the Fe/Mn and As, it brings the potential danger for drinking water.

Keywords:

• Bank filtration
• redox zonation
• microbial community structure
• hydrodynamic evolution

Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant number 41372238, 41602271 and 41602247), China Geological Survey (Research Projects number DD 20189114 and JYYWF 20181101).

Disclosure statement

No potential conflict of interest was reported by the authors.