Affiliation:
1. Water Quality Branch, The Metropolitan Water District of Southern California, La Verne, California 91750
Abstract
Three
Oscillatoria
strains and one
Anabaena
species were isolated from three different water supply systems in California that experienced earthy-musty taste and odor problems in their drinking water. Unialgal cultures, free of actinomycetes, were purged using the Grob closed-loop stripping analysis method, and the resulting methylene chloride extracts were analyzed on a gas chromatograph/mass spectrometer. Geosmin was produced by
Oscillatoria simplicissima
and
Anabaena scheremetievi
, and 2-methylisoborneol was produced by
O. curviceps
and
O. tenuis.
These compounds are the two major causes of earthy-musty tastes and odors in water. In three instances, the major odorant found in culture was previously identified in the water or sediment sample from which the respective organism was isolated.
O. curviceps
was implicated in a taste and odor episode involving 2-methylisoborneol in a major reservoir. Geosmin and 2-methylisoborneol were easily detected with culture samples of only 4 to 25 ml.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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