State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
J Hazard Mater. 2022 Mar 5;425:128056. doi: 10.1016/j.jhazmat.2021.128056. Epub 2021 Dec 10.
Occurrences of odor compounds in drinking water reservoirs are considered as a nuisance by the water industry. Through the high-frequency monitoring of Tianmuhu Reservoir, a drinking water source for a city with a population of 700,000, we found that odor compounds seasonal dynamics were significantly related to phytoplankton succession, which was controlled by hydrometeorological process. 2-Methylisoborneol (2-MIB) was significantly related to Aphanizomenon sp. (r = 0.51). When the surface water temperature exceeded 12 ℃, 2-MIB concentration may exceed the odor threshold concentration. With the proliferation of Aphanizomenon sp. in spring, 2-MIB concentration reached 87.22 ng/L. After late spring heavy rain, 2-MIB concentration sharply decreased to 3.19 ng/L. As the temperature increased at the end of the rainy season, Aphanizomenon sp. biomass increased to 2.09 mg/L, and 2-MIB concentration increased to 40.16 ng/L. These results showed that the concentration of odor compounds in shallow layer varied greatly because odor compounds mainly originated from phytoplankton and were susceptible to short-term hydrometeorological processes. However, the concentrations of odor compounds in deep layer were relatively insensitive to short-term weather processes. This study will improve the understanding of seasonal changes in odor compounds at different depths, and provide useful information for reservoir managers to prevent odor problems.
饮用水库中气味化合物的出现被认为是水行业的一种滋扰。通过对一个拥有 70 万人口的城市饮用水源——天沐湖水库的高频监测，我们发现气味化合物的季节性动态与浮游植物演替有显著的关系，而浮游植物演替受水文学气象过程的控制。2-甲基异莰醇（2-MIB）与鱼腥藻属（Aphanizomenon sp.）显著相关（r=0.51）。当表层水温超过 12℃时，2-MIB 浓度可能超过气味阈值浓度。春季鱼腥藻属大量繁殖时，2-MIB 浓度达到 87.22ng/L。春季后期暴雨过后，2-MIB 浓度急剧下降至 3.19ng/L。随着雨季末期温度的升高，鱼腥藻属生物量增加到 2.09mg/L，2-MIB 浓度增加到 40.16ng/L。这些结果表明，由于气味化合物主要来源于浮游植物，并且容易受到短期水文学气象过程的影响，浅层的气味化合物浓度变化很大。然而，深层的气味化合物浓度对短期天气过程相对不敏感。本研究将提高对不同深度气味化合物季节性变化的认识，为水库管理者提供有用的信息，以防止气味问题。
