Seasonal occurrence and degradation of 2-methylisoborneol in water supply 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

“…In Arizona reservoirs, temperature is a critical factor in production and distribution of MIB and geosmin (Westerhoff et al, 2005). In contrast, no relationship could be found between water temperature and MIB or GEO in our study.…”

“…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.…”

“…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).…”

Contribution of Streptomyces in sediment to earthy odor in the overlying water in Xionghe Reservoir, China

“…After incubation for 12 days (Table 1), it was found that 51.4% of the geosmin initially present in the sediment was lost. Since there are at least four loss mechanisms for both geosmin and 2-MIBdvolatilization, biodegradation, photolysis, and sorption (Westerhoff et al, 2005)dit could be inferred that geosmin release from sediment to the water phase was lower than 51.4%. After incubation for 3 days, except for volatilization to the atmosphere, geosmin concentration was at a peak level of 82.5 ng L À1 in the water phase, which accounted for 21.4% of the geosmin present in sediment.…”

Remoção dos compostos odoríferos geosmina e 2-metilisoborneol de águas de abastecimento através de processos de aeração em cascata, dessorção por ar e nanofiltração

“…Embora aeração seja uma técnica de tratamento comum para remoção de gosto e odor, sua eficiência está associada ao tipo de substância odorífera presente na água (LOGSDON; HESS; HORSLEY, 1999). As remoções relativamente baixas observadas devem estar associadas ao fato de MIB e geosmina serem compostos semivoláteis, com constantes de Henry da ordem de 10 -2 atm.M -1 (LALEZARY et al,1984;WESTERHOFF et al, 2005 Tabela 1 -Concentrações de MIB e geosmina nos afluentes e efluentes do sistema de aeração tipo cascata, nas condições de operação testadas (ng.L -1 )…”