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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:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units)
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
INOCULUM/TEST ORGANISM
- Source: municipal WWTP Marl-West, sampled 17 Feb 1984
- Pretreatment: fed into test apparatus ca. 40 min after sampling
Duration of test (contact time):
3 h
Initial conc.:
10.4 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation:
DOC removal
Details on study design:
TEST SYSTEM
- Culturing apparatus: flow-through
- Number of culture flasks per concentration: 1
- Aeration device: pump
- Closed vessels used: no

TEST DURATION
- 34 days
% Degr.:
68.9
St. dev.:
10.9
Parameter:
DOC removal
Sampling time:
34 d
Transformation products:
no

The mean of 24 measurements at approximately regular intervals is 68.86  +/- 10.90 % degradation.

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
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

Description of key information

A simulation study in water or sediment does not need to be conducted because the substance is readily biodegradable.

Key value for chemical safety assessment

Additional information

The mean of 24 measurements at approximately regular intervals is 68.86 +/- 10.90 % degradation in an OECD 303A study (Hüls, 1997).