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Identification of odorous compounds in reclaimed water using FPA combined with sensory GC-MS
Authors:Zhiming Yan  Yu Zhang  Jianwei Yu  Hongying Yuan  Min Yang
Affiliation:State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Beijing 100085, China
Abstract: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.
Keywords:sewery/swampy/septic odor  reclaimed wastewater  flavor profile analysis  sensory-GC-MS analysis
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