The objective of this study was to investigate the odor and physicochemical characteristics of a model deep wastewater reservoir (the Na'an reservoir). Depth sampling of the reservoir revealed depletion of oxygen and increase of hydrogen sulfide and organic nitrogen and sulfur odorous compounds at deeper levels of the reservoir. TOC, TON, BOD5 and chromatographic fingerprinting by MSD and Olfactory/GC of the semi-volatile organic compounds in the reservoir were found to be season dependent. Late summer was found to be the most odorous period and the richest in semi-volatile compounds. A list of volatile compounds, which were identified by gas chromatography, in the reservoir water and in the surrounding atmosphere was compiled.

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