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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Endpoint:
biodegradation in water: sewage treatment simulation testing
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Remarks:
Limited information available. Not a widely recognized data source
Principles of method if other than guideline:
No information available.
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, adapted
Initial conc.:
139 mg/L
Based on:
test mat.
Details on study design:
- Test temperature: 22 to 25 deg C
% Degr.:
> 98
Parameter:
other: oxygen demand
Sampling time:
28 d
% Degr.:
> 70
Parameter:
other: theoritical oxidation
Sampling time:
28 d

Following 28 days acclimation acetonitrile was introduced to activated sludge as a continuous feed with effluent removal. The study was conducted at 22-25 degree C. Degradation (>98% removal) was based on the difference between the influent and effluent oxygen demands, while theortetical oxidation (>70%) was based on the ratio of observed oxygen demand and theoretical oxygen demand.

Executive summary:

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 degrees 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.

Endpoint:
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
Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
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

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.