Study On The Distribution Of Odourous Compounds In Eutrophic Water Body And The Products Of Anaerobic Metabolizing Of Algaes

In this paper, dissolved and particulate odourous compounds in water were determined by Headspace Solid Phase Microextraction coupled with Gas Chromatography/Mass Spectrum (HS-SPME-GC/MS). The distribution and variation of 9 odourous compounds in a typical eutrophic water body were studied.5 compounds were selected to validate the analysis method for particulate compounds, the RSD were less than 6%, the recovery value were between 90% and 120%. The results show that the method has good precision and accuracy for analysis. Based on the above results, odourous compounds in filtered water and suspended solids from Taihu Lake were determined through 2009. Different compounds showed different distribution and variation, and sampling sites also impacted their characters. In summer, a great deal of particulate odourous compounds existed in Taihu Lake. The 9 compounds achieved their highest particulate contents in July and August. Particulate contents of these compounds had a significant correlation with the quantity of algaes in Taihu Lake.When algaes decomposed in an anaerobic condition at 15℃,30℃and 45℃, diverse productions showed their own variation trend, and some of them related to temperature intently. The concentration of fatty acids reached two peaks. Peaks of butyric acid and acetic acid appeared earlier at a higher temperature, and their concentration increased with the rising of temperature. Peaks of propionic acid appeared later when temperature was higher, and it had the highest concentration at 30℃. H2 and CO2 reached two content peaks, and their peaks appeared earlier at a higher temperature. CH4 reached three content peaks, but they didn't relate to temperature remarkably. H2, CO2 and CH4 had their highest content at 30℃. DMS, DMDS, DMTS, MIB, GEO andβ-Ionone were produced and then degraded during the metabolizing of algaes.β-Cyclocitral and m-xylene were degraded rightly during the process. Rising temperature was propitious to both production and degradation of odourous compounds.