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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Depending on local conditions and existing concentrations, disturbances in the biodegradation process of activated sludge are possible. 

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Additional information

The respiration inhibition induced by Triclosan in activated sludge was tested in two available guideline studies conducted according OECD guideline 209. The studies detected a inhibition by 50 % after an incubation time of 3 hours at 11 and 20 mg/l respectively (Ciba Specialty Chemicals 2007, Ciba-Geigy Ltd. 1990). In a further study the effect of Triclosan on nitrification in activated sludge was tested. The study set up followed ISO guideline 1989. The test was terminated after 4 hours and an EC50 of 11.4 mg/l was determined (Ciba-Geigy AG 2003).