Abstract
Geosmin is one of the major causative compounds of earthy-musty odor and taste (off-flavor) in drinking water (lakes) and in farmed fish. In this study, the sorption of cyclodextrin polymers (CDPs) towards geosmin in aqueous solution was investigated. Sorption kinetics, the effect of solution pH and contact time on the sorption capability of α-, β- and γ-cyclodextrin polymers was discussed. Results disclosed that the sorption of geosmin by the CDPs followed the Ho and McKay kinetic mechanism with the liquid film diffusion as the rate-determining step. Both β-CDP and γ-CDP exhibit high removal efficiencies of 93.4% and 96%, respectively, within 240 minutes at 25°C and pH 7, whilst α-CDP was not effective, removing only 40% geosmin, at an initial concentration of 5 μg·L—1and 5 g·L—1of CDP dose. The cyclodextrin polymers can adapt to a wide range of pH from 3.0 to 11.0 for geosmin adsorption with pH 7.0 as optimum. Results indicate that these sorbents demonstrate significant potential in reducing the concentration of geosmin in water that presents taint problems in both drinking water and fish.
Highlights
Off-flavor comprises one of the biggest problems in the drinking water industry and aquaculture
Thereafter, the rate of geosmin sorption on the 3 cyclodextrin polymers (CDPs) was found to be slow until the equilibrium was reached and remained constant
The results reveal that rapid surface attachment of geosmin onto the polymers played a major role at the initial stage, which led to a fast initial geosmin removal from the water especially for β-CDP and γ-CDP
Summary
Off-flavor comprises one of the biggest problems in the drinking water industry and aquaculture. Geosmin (trans1, 10-dimethyl-trans-9-decalol) is a naturally occurring germacranoid sesquiterpene, produced by several species of cyanobacteria (i.e. Anabaena, Oscillatoria and Phormodium) and actinobacteria (especially Streptomyces) that impart an earthy-musty odor to water and fish when present at extremely low concentrations [1]. It is one of the most common taste- and odor-causing compounds found in drinking water supplies and in freshwater aquaculture ponds. Adsorption is a much better process, in terms of efficiency and economy, than other physical techniques mentioned above It is one of two treatment methods that have been successfully employed by water treatment plants to remove geosmin, the other being oxidation by ozone
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