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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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biodegradation in water: sediment simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is readily biodegradable
biodegradation in water: simulation testing on ultimate degradation in surface water
Data waiving:
other justification
Justification for data waiving:
the study does not need to be conducted because the substance is readily biodegradable

Description of key information

The test item is readily biodegrdable (Frauenhofer IME, 2011) therefore further experimental studies are not required.

Key value for chemical safety assessment

Additional information

The test item is readily biodegradable therefore simulation tests are not required according to REACh Annex IX.

Nevertheless, a reliable publication of Eiroa et al, 2005 supports these findings. The removal of the test item in biological sewage treatment plants was studied in a lab-scale activated sludge unit. The test is comparable to OECD 303 A (Confirmatory Test). During the operation period of 160 days the influent concentrations were increased stepwise from 26 to 3168 mg/L. Removal of the test item was calculated based on substance-specific and COD measurements. During the operation period, the test item concentrations increased slightly when the influent concentrations were increased. Based on substance-specific measurements, high removal efficiencies of around 99.5% were maintained at all influent concentrations. However, ca. 18% of influent COD was present in effluent. The relative high COD content in the effluent can be explained by disproportionation of the test item to methanol and formic acid. It was shown in previous experiments that degradation of methanol and formic acid began after exhaustion of the test item in the medium. In the unit, ammonium was removed around 99.9%, indicating that there was no inhibition of nitrification. The hydraulic retention time (2.4 days) in the test unit is above the value (6 hours) proposed by the OECD guideline 303 A. Therefore, the resulting removal rate is assumed to probably overestimate removal in biological treatment plants.

In conclusion, in the WWTPs simulation tests the test item was removed to 99.5% under aerobic conditions.