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A fishy odor episode in a north China reservoir: Occurrence, origin, and possible odor causing compounds

Journal of Environmental Sciences 2013年第12期25卷 2361-2366页

作者： Yunyun Zhao Jianwei Yu Ming Su Wei An Min Yang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences

A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species （two diatom and one chrysophyte species） observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6- nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover.

关键词： fishy odor chrysophyte diatom reservoir drinking water flavor profile analysis

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Identification of odorous compounds in reclaimed water using FPA combined with sensory GC-MS

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Journal of Environmental Sciences 2011年第10期23卷 1600-1604页

作者： Zhiming Yan Yu Zhang Jianwei Yu Hongying Yuan Min Yang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085 China.

Odorous compounds in the influent of a reclaimed water treatment plant （RWTP）, consisting of coagulation, sedimentation, continuous micro-filtration （CMF）, and chlorination in succession, in a north China city, were identified by combining flavor profile analysis （FPA） with sensory gas chromatograph-mass spectrometry （GC-MS）. The sewery/swampy/septic odor with an odor intensity of 6.4 was found to be the major odor group in the RWTP influent, and the existence of well-known odorant including dimethyl disulfide, dimethyl trisulfide, indole and skatole were confirmed using GC-MS. The result of a spiking test showed that the intensity （3.6） of the sewery/swampy/septic odor caused by these four chemicals contributed to over 50% of the odor intensity of the influent. The FPA intensity for sewery/swampy/septic odor in the RWTP effluent was 3.8, showing that the treatment process was not efficient for the removal of odorants, particularly indole and skatole.

关键词： sewery/swampy/septic odor reclaimed wastewater flavor profile analysis sensory-GC-MS analysis

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Occurrence of odor problems in drinking water of major cities across China

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Frontiers of Environmental Science & Engineering 2014年第3期8卷 411-416页

作者： Daolin SUN Jianwei YU Min YANG Wei AN Yunyun ZHAO Ning LU Shengguang YUAN Dongqing ZHANG State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Shanghai National Engineering Research Center of Urban Water Resources Co. Ltd. Shanghai 200082 China

A comprehensive investigation into the occur-rence of odor problem at 111 drinking water treatment plants （DWTPs） in major cities across China was undertaken using both flavor profile analysis （FPA） and gas chromatography-mass spectrometry （GC-MS）. Eighty percent of source water samples exhibited odor problems, characterized by earthy/musty （41%） and swampy/septic （36%） odors, while the occurrence rate was lower （45%） in the finished water. Source water from rivers exhibited more pollution-origin odors, such as the swampy/septic odor, while that from lakes and reservoirs exhibited more algae- origin odors, such as earthy/musty odors. The occurrence rate of 2-methylisoborneol （2-MIB） in the surface source water samples was 75%, with 7% of samples containing 2- MIB concentrations of over 10 ng.L-1. The earthy/musty odor in the lake/reservoir water samples was mainly caused by 2-MIB （linear regression coefficient, R2= 0.69）, while the correlation between 2-MIB concentration and the earthy/musty odor intensity samples was weak （R2= 0.35） in the river-source water These results will be useful for the management of odor-quality problems in drinking water of China.

关键词： flavor profile analysis 2-methylisobomeol swampy/septic odor eaxthy/musty odor drinking water quality

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