Assessing the impacts of fine sediment removal on endogenous pollution release and microbial community structure in the shallow lakes

Resuspension is a crucial process for releasing endogenous pollution from shallow lakes into the overlying water. Fine particle sediment, which has a higher contamination risk and longer residence time, is the primary target for control-ling endogenous pollution. To this end, a study coupling aqueous biogeochemistry, electrochemistry, and DNA se-quencing was conducted to investigate the remediation effect and microbial mechanism of sediment elution in shallow eutrophic water. The results indicated that sediment elution can effectively remove some fine particles in situ. Furthermore, sediment elution can inhibit the release of ammonium nitrogen and total dissolved phosphorous into the overlying water from sediment resuspension in the early stage, resulting in reductions of 41.44 %-50.45 % and 67.81 %-72.41 %, respectively. Additionally, sediment elution greatly decreased the concentration of nitrogen and phosphorus pollutants in pore water. The microbial community structure was also substantially altered, with an increase in the relative abundance of aerobic and facultative aerobic microorganisms. Redundancy analysis, PICRUSt function prediction, and the correlation analysis revealed that loss on ignition was the primary factor responsible for driving changes in microbial community structure and function in sediment. Overall, the findings provide novel in-sights into treating endogenous pollution in shallow eutrophication water.

Automated summary

Based on the study, resuspension is a crucial process for the release of endogenous pollution from shallow lakes. Sediment elution technique can effectively remove fine particle sediment and inhibit the release of ammonium nitrogen and total dissolved phosphorous. Moreover, it alters the microbial community structure and decreases the concentration of nitrogen and phosphorus pollutants in pore water.