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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. Simulation testing of oleic-acid based IQAC in sediments is not necessary.

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Additional information

In a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), closely related substance partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. The nitrification of the sludge unit was > 95%. The ammonium concentration was < 2 mg/L in the effluent.

Therefore simulation testing of oleic-acid based IQAC in sediments is not necessary. In addition the oleic-acid based IQAC hydrolyses rapidly in water at environmental pH (Half lifeat pH7 2.9 days at 20°C, 2.5 days at 25°C, and at pH 9 the half life is 1.2 days at 20 °C) and proved to be inherently biodegradable (> 90% COD elimination after 28 d according to German Guideline DIN 38412, Part 25, corresponding to OECD 302 B)