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Microbial controls on heavy metals and nutrients simultaneous release in a seasonally stratified reservoir

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Abstract

The eutrophication of reservoirs can change the physicochemical parameters of water, thus affecting the migration and transformation of heavy metals. At present, there is insufficient research on the coupling mechanisms between nutrients and heavy metals, especially between heavy metals in suspended particles. In this paper, spatial and temporal distribution characteristics of nutrients dissolved heavy metals, and heavy metals in suspended particles were analyzed in a seasonally stratified reservoir. Combined with the nitrogen and phosphorus biogeochemical process, the coupling mechanisms between heavy metals and nutrients were discussed. The results showed that the Aha Reservoir had temperature and dissolved oxygen stratification in April and July. The reduction and dissolution of Fe and Mn oxide/hydroxide and the resuspension of sediments might result in a simultaneous increase in the concentrations of nutrients, dissolved heavy metals and heavy metals in suspended particles in hypolimnion in July and October. In the presence of dissimilatory iron-reducing bacteria (DRIB), the dissolution of iron-bound phosphorus in sediments and suspended particulate matter (SPM) might lead to the simultaneous release of iron and phosphorus into the water. The dissolution of metal sulfides in the sediments and SPM under the action of dissimilatory nitrate reduction to ammonium (DNRA) bacteria might lead to the simultaneous release of ammonia nitrogen and heavy metals into the water. Due to the coupling between nitrogen and phosphorus and heavy metals, seasonal stratified reservoir may face the risk of periodic simultaneous pollution of eutrophication and heavy metals in summer and autumn. This research provides theoretical support for the treatment of heavy metal and eutrophication combined pollution in karst areas.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was financially supported by National Natural Science Foundation of China (Grant No. U1612442, 52000136), National Key Research and Development Program of China (2016YFA0601000), Opening Fund of the State Key Laboratory of Environmental Geochemistry (SKLEG2021210), and Tianjin Research Innovation Project for Postgraduate Students (2020YJSB060).

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The manuscript was reviewed and approved for publication by all authors. XDL and SYD conceived and designed the experiments. HL, YYW, GYC, and MDY performed the experiments. XCZ, MDY, and SYD analyzed the data. XCZ wrote the paper. XCZ, SYD, GYC, MDY, HL, YYW, THG, and XDL reviewed and revised the paper.

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Correspondence to Shiyuan Ding or Xiao-Dong Li.

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The authors declare no competing interests.

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Zhang, X., Ding, S., Lv, H. et al. Microbial controls on heavy metals and nutrients simultaneous release in a seasonally stratified reservoir. Environ Sci Pollut Res 29, 1937–1948 (2022). https://doi.org/10.1007/s11356-021-15776-4

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  • DOI: https://doi.org/10.1007/s11356-021-15776-4

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