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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Early tests reported >98% removal of acetonitrile introduced to activated sludge as a continuous feed with effluent removal.  A waiver from further simulation testing in water and sediment is requested.

Key value for chemical safety assessment

Additional information

Following 28 -day acclimation, Ludzack (1960) reported >98% removal of acetonitrile introduced to activated sludge as a continuous feed with effluent removal. The study was conducted at 22-25 °C. Removal of acetonitrile was based on the difference between the influent and effluent oxygen demands. Theoretical oxidation (>70%) was based on the ratio of observed oxygen demand and theoretical oxygen demand.

A waiver from further simulation testing in water and sediment is requested on the basis of this early study and the fact that acetonitrile is readily biodegradable in reliable screening tests.