Development of predictive models for geosmin-related taste and odor in Kansas, USA, drinking water reservoirs

A systematic study on spatial and seasonal patterns of eight taste and odor compounds with relation to various biotic and abiotic parameters in Gonghu Bay of Lake Taihu, China

“…MIB and GEO are secondary metabolites produced by cyanobacteria, actinomycetes, fungi and myxobacteria, and responsible for most reports of source water odors (Dzialowski et al, 2009;Smith et al, 2008;Suffet et al, 1996;Watson et al, 2000;Westerhoff et al, 2005). In the present study, total concentrations of GEO in the water ranged from 0 to 11.29 ng/L, and the annual mean concentrations in dissolved and particulate fractions were 1.96 and 1.37 ng/L, respectively.…”

“…Different from that extreme event, neither dissolved nor particulate concentrations of all the eight T&O compounds showed correlations with the concentration of NH 4 -N in our study. Dzialowski et al (2009) observed negative relationships between GEO (only dissolved geosmin was detected in their study) and dissolved inorganic phosphate (PO 4 -P) concentrations in drinking water reservoirs, and speculated that possibly increased phytoplankton depleted available PO 4 -P, resulting in subsequent blooms and increases in geosmin concentrations. However, the present study found no relationship between PO 4 -P and dissolved or particulate concentrations of GEO, whereas dissolved concentrations of GEO showed significant correlations with NO 3 -N (r = 0.201, P b 0.01), TDN (r = 0.165, P b 0.05) and TN (r = 0.304, P b 0.01), respectively (Table 4).…”

“…Durrerl et al (1999) reported that in a stratified mesotrophic prealpine lake, in the autumn and early winter, surface films contributed essentially to the particlebound fraction of GEO exhibiting a maximum concentration of 21 ng/L, while in the clear-water period (May), dissolved fraction of GEO increased dramatically (up to 93% of the total) whereas particle-bound GEO showed only minor changes. Dzialowski et al (2009) developed predictive models for geosmin-related taste and odor in drinking water reservoirs of Kansas, USA, but failed to find out consistent spatial patterns in GEO production either between or within the reservoirs. The great variation in GEO pattern between different waters might be explained by the fact that the dynamics of GEO production can vary among different species and sometimes even among strains of the same species.…”

“…In the present study, neither dissolved nor particulate concentrations of GEO and MIB showed correlation to intracellular or extracellular MC concentrations or biomass of any phytoplankton phylum. Similarly, Dzialowski et al (2009) found that cyanobacterial biovolume is not a consistent predictor of dissolved geosmin, and Durrerl et al (1999) indicated that correlations between a particular taxon and particle-bound geosmin cannot be expected to occur in any instance in natural waters. On the contrary, a few researchers observed positive correlation between geosmin and cyanobacterial biovolume (Jüttner and Watson, 2007;Sugiura et al, 2004).…”

“…Among the eight odor groups described in the water flavor wheel, the earthy-musty odors are of particular interest because they are unpalatable and often encountered in water (Suffet et al, 1996). Over the past years, many studies have focused on the well-known earthymusty algal metabolites trans-1,10-dimethyl-trans-9-decalol (geosmin, GEO) and 2-methylisoborneol (MIB) (Durrerl et al, 1999;Dzialowski et al, 2009;Huang et al, 2007;Lin et al, 2002;Suffet et al, 1996;Sugiura et al, 1998;Watson et al, 2000;Westerhoff et al, 2005), whereas there are only a few studies on other cyanobacterial metabolites such as β-cyclocitral, β-ionone, 2-isopropyl-3-methoxypyrazine (IPMP) and 2-isobutyl-3-methoxypyrazine (IBMP) (Li et al, 2007;Peter et al, 2009;Xu et al, 1999). Previous studies have mainly focused on the production of T&O compounds by isolated phytoplankton species or on the natural occurrence of selected T&O compounds, while the triggers, mode and dynamics of these cyanobacterial metabolites are still unclear (Peter et al, 2009;Watson, 2003).…”