Spatial Distribution and Influencing Factors of Odorous Substances 2-methylisoborneol and Geosmin in Reservoirs in Guangdong Province
2-methylisoborneol(2-MIB)and geosmin(GSM)are the main odorous substances causing the odors outbreak of reservoir water source in Guangdong Province.Understanding the distribution and concentrations of these substances is crucial for ensuring the safety of water supply.Cyanobacteria,a primary component of phytoplankton,are identified as the main producers of these odorous compounds.To gain insights into the spatial patterns of 2-MIB and GSM,as well as the factors influencing their concentration levels,a comprehensive study was conducted across 33 reservoirs in Guangdong.This study involved measuring the concentrations of these odors,assessing environmental conditions and evaluating cyanobacteria abundance.Advanced multivariate statistical analysis helped in uncovering the characteristics of their distribution and identifying the key factors affecting their presence in the reservoirs.The study found that 67％of the 33 surveyed reservoirs contained 2-MIB,while 21％exhibited traces of GSM.Notably,40％of these reservoirs had odor levels surpassing 10 ng/L,predominantly due to 2-MIB.Among the reservoirs,five genera of filamentous cyanobacteria known for producing odors were identified.Limnothrix,Pseudanabaena,Planktothrix and Planktolyngbya were linked to 2-MIB,and Planktothrix and Dolichospermum were associated with GSM.The statistical analysis showed that 2-MIB and GSM concentration level were significantly correlated with the filamentous cyanobacteria abundance.The study suggests that eutrophication,or the excessive richness of nutrients in water,favors the proliferation of cyanobacteria,thereby elevating the risk of odor outbreaks in reservoirs.
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