Temperature, phytoplankton density and bacteria diversity drive the biotransformation of micropollutants in a lake ecosystem

WATER RESEARCH

卷:202

Article

Chalifour, Annie¹  Walser, Jean-Claude²  Pomati, Francesco¹  Fenner, Kathrin^1,3 

[1] Swiss Fed Inst Aquat Sci & Technol, Eawag, Uberlandstr 133, CH-8600 Dubendorf, Switzerland

[2] Swiss Fed Inst Technol, Genet Divers Ctr, Dept Environm Syst Sci, Univ Str 16, CH-8006 Zurich, Switzerland

[3] Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland

关键词: Biotransformation;    Pharmaceuticals;    Pesticides;    Microbial community;    Phytoplankton;    Random forest;   

DOI  :  10.1016/j.watres.2021.117412

来源: Elsevier

【 摘 要 】

For most micropollutants (MPs) present in surface waters, such as pesticides and pharmaceuticals, the contribution of biotransformation to their overall removal from lake ecosystems is largely unknown. This study aims at empirically determining the biotransformation rate constants for 35 MPs at different periods of the year and depths of a meso-eutrophic lake. We then tested statistically the association of environmental parameters and microbial community composition with the biotransformation rate constants obtained. Biotransformation was observed for 14 out of 35 studied MPs for at least one sampling time. Large variations in biotransformation rate constants were observed over the seasons and between compounds. Overall, the transformation of MPs was mostly influenced by the lake's temperature, phytoplankton density and bacterial diversity. However, some individual MPs were not following the general trend or association with microorganism biomass. The antidepressant mianserin, for instance, was transformed in all experiments and depths, but did not show any relationship with measured environmental parameters, suggesting the importance of specific microorganisms in its transformation. The results presented here contribute to our understanding of the fate of MPs in surface waters and thus support improved risk assessment of contaminants in the environment.

【 授权许可】

Free