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Water Science & Technology: Water Supply Vol 1 No 4 pp 11–18 © IWA Publishing 2001

Trichloroanisole kinetics and musty tastes in drinking water distribution systems

P. Piriou*, L. Malleret**, A. Bruchet*** and L. Kiéné****

*Lyonnaise des Eaux - CIRSEE, 38 rue du Président Wilson, 78230 Le Pecq, France
**Lyonnaise des Eaux - CIRSEE, 38 rue du Président Wilson, 78230 Le Pecq, France
***Lyonnaise des Eaux - CIRSEE, 38 rue du Président Wilson, 78230 Le Pecq, France
****Lyonnaise des Eaux - CIRSEE, 38 rue du Président Wilson, 78230 Le Pecq, France


ABSTRACT
Trichloroanisoles (TCA) might contribute to several unsolved earthy-musty taste episodes, because their taste threshold concentrations are lower than the CLSA GC-MS detection limit. The relative importance of such taste-causing compounds in earthy-musty taste episodes in distribution systems was investigated by combining lab-scale and water aging experiments in a pipe loop pilot. Experiments showed that earthy-musty taste associated with TCA formation can easily occur in distribution systems and is linked mainly to fungi metabolism. By maintaining chlorine residual, a control of such tastes can be achieved. The masking effect of these earthy-musty tasters induced by TCA by chlorine is not very effective.

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