

FOLLOWUS
1.Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing210008, China
2.School of Geography Sciences, Nanjing Normal University, Nanjing210023, China
3.Shaoxing Yuanshui Group Co., Ltd., Shaoxing312000, China
gwzhu@niglas.ac.cn
Received:30 January 2024,
Published:01 November 2024
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XIAO Man,WEI Yanzhang,ZHENG Danping,et al.Outbreak of 2-methylisoborneol in a drinking water reservoir attributed to the cyanobacterium Pseudanabaena sp.[J].Journal of Oceanology and Limnology,2024,42(06):1789-1804.
XIAO Man,WEI Yanzhang,ZHENG Danping,et al.Outbreak of 2-methylisoborneol in a drinking water reservoir attributed to the cyanobacterium Pseudanabaena sp.[J].Journal of Oceanology and Limnology,2024,42(06):1789-1804. DOI: 10.1007/s00343-024-4034-8.
Taste and odor compounds (T
&
Os)
which is often associated with plankton in water sources
pose significant challenges to water quality in the world. Identifying the potential producers and understanding the driving factors are critical for effective treatment. While most studies focused on outbreak of T
&
Os linked with summer cyanobacterial blooms
questions remain about the mechanisms and environmental factors driving spring outbreaks when cyanobacteria are typically in low abundance. Therefore
changes in the concentrations of T
&
Os
i.e.
2-methylisoborneol (2-MIB) and three others
in relation to the phytoplankton community
the physico-chemical and hydrological conditions in a mesotrophic reservoir surrounded by hills in East China were investigated from March to June 2023.Results show that 2-MIB was the main T
&
O during the spring outbreak of phytoplankton
and peaked at 96.10 ng/L
which is nearly 10 times of its odor threshold concentration (OTC) of 10 ng/L. The filamentous cyanobacterium
Pseudanabaena
sp. was identified as the primary producer of 2-MIB
and the cell concentration of 4 000 cells/mL of
Pseudanabaena
sp. could potentially result in 10 ng/L of 2
-MIB in this reservoir. The abundance of
Pseudanabaena
sp. and 2-MIB were correlated significantly with turbidity
suggesting that a lower light environment might be critical to promote the dominance of
Pseudanabaena
sp. and the subsequent production of 2-MIB. Moreover
the combination of consistently decreased water level
moderate water stratification
optimal water temperature ranging ~14–23 °C
the increase of the chemical oxygen demand using permanganate as an oxidant (COD
Mn
) and total nitrogen (TN) concentration were likely to drive the accumulation and outbreak of 2-MIB. The hydrodynamic disturbance (i.e.
a sudden rapid flow of water) triggered the abrupt disappearance of both
Pseudanabaena
sp. and 2-MIB. This study suggests that proliferation of
Pseudanabaena
sp. in spring is important in contributing to 2-MIB outbreak
and flushing may be an effective approach to mitigate T
&
O issues in water sources.
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