3.上海城投原水有限公司,上海 200125
1.School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3.Shanghai Chentou Raw Water Co. Ltd., Shanghai 200125, China
华东地区某水源水库近年来出现季节性嗅味问题。为解析嗅味产生来源及其成因,于2018年4月至2019年12月对该水库上游以及库内水体进行长期监测。监测结果表明,2-甲基异莰醇(2-MIB)是主要的土霉味致嗅物质,伪鱼腥藻是该水库潜在产嗅藻种,且其主要为外源输入。相关性分析结果表明,伪鱼腥藻的生长与水温及水下光照(透明度、浊度)等有关。为进一步解析水下光照因素驱动下伪鱼腥藻在水库水体中的分布特征,在水库高嗅期间开展了72 h连续监测,重点分析了伪鱼腥藻昼夜与垂向分布特征。结果表明,在08:00,伪鱼腥藻往表层迁移,在10:00—14:00,表层密度达到最高值,白天在水体中呈现明显的垂向迁移特征,而夜晚在水体中各层的分布无明显变化,这进一步说明水下光照对伪鱼腥藻生长的重要性。以上结果进一步提升了对实际水体中伪鱼腥藻分布规律的认识,可为水源地中伪鱼腥藻导致的嗅味问题提供借鉴。
Taste & odor problems have been occasionally observed in a drinking water reservoir in East China. In order to analyze the source and cause of ordor fromation, specific investigation of this reservoir as well as the upstream has been performed from April, 2018 to December, 2019. The result indicates 2-methylisoborneol is the major musty odorant, while
, mainly comes from the upstream, is the potential 2-MIB producer. The correlation analysis suggests water temperature, underwater light availability (water transparency, water turbidity) are the major drivers responsible for the growth of
. A 72 hour-field study was performed in the reservoir during the odor period in July of 2018, aiming to identify the diurnal variation and vertical distribution of
. The result shows the cells tend to move upwards to surface water from 08:00, reach the highest cell density in this layer during 10:00 and 14:00. Significant vertical migration of
cells was observed along with solar irradiance changes in the daytime, while insignificant distribution variaitions in each layer of reservoir water occurs in night, further indicating the importance of light underwater for the growth of
. The result enhanced the understanding of the distribution pattern of
in water reservoir.
.
Sampling sites in the reservoir
致嗅物质2-MIB和geosmin浓度的季节分布
Seasonal distribution of 2-MIB and geosmin concentration in the reservoir
Correlation analysis of predominant cyanobacteria cell density with 2-MIB concentration
and its correlationanalysis in different sites
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