2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 9:00 AM - 9:15 AM | BIOAVAILABILITY OF DISSOLVED ORGANIC MATTER IN A CYANOBACTERIAL BLOOMING LAKE AND INPACTS ON EMERGING CONTAMINANT BEHAVIOUR | 321
BIOAVAILABILITY OF DISSOLVED ORGANIC MATTER IN A CYANOBACTERIAL BLOOMING LAKE AND INPACTS ON EMERGING CONTAMINANT BEHAVIOUR
Cyanobacterial blooms frequently occur in eutrophic freshwater lakes, subsequently, substantial amounts of dissolved organic matters (DOM) are produced. The laboratory four-stage plug-flow bioreactor was developed and successfully separated the cyanobacteria-derived DOM isolated from the eutrophic freshwater lake into continuum classes of bioavailable compounds. The results showed that the total loss of 79% of dissolved organic carbon over time was accompanied by depletion of protein-like fluorescent components, especially the relatively hydrophilic ones. Consistently, ultrahigh resolution mass spectrometry (FT-ICR-MS) revealed that smaller, less aromatic, more oxygenated, and nitrogen-rich molecules were preferentially consumed by microorganisms with the production of lipid-like species, whereas recalcitrant molecules were primarily composed of carboxylic-rich alicyclic compounds. In addition, the bioavailability of DOM was negatively correlated with microbial community diversity in the bioreactor. Moreover, the bioavailability of DOM was found to affect the behavior of emerging contaminates in lakes, and recalcitrant components could stimulate the biodegradation of emerging contaminates. Results from this study provide deeper insights into the relevant biogeochemical processes of cyanobacteria-derived DOM and impact on the fate of emerging contaminant in eutrophic lakes.
- Bacteria
- Algae
- Organic Matter
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Presenters/Authors
Helong Jiang
(), State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing , hljiang@niglas.ac.cn;
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Leilei Bai
(), Nanjing Institute of Geography and Limnology, xiaobai003@163.com;
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