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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Reference
Endpoint:
biodegradation in water: sewage treatment simulation testing
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
March - April 1980
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: document insufficient
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units)
Principles of method if other than guideline:
The biodegradability of Aminoxid WS 35 was investigated in the OECD-Confirmatory-Test and the OECD Coupled Units Test.
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
25 - 42 d
% Degr.:
98
Parameter:
other: influent/effluent concentrations
Remarks on result:
other: OECD-Confirmatory-Test
% Degr.:
77
Parameter:
DOC removal
Remarks on result:
other: Coupled Units-Test

In the OECD-Confirmatory-Test a biodegradation of 98% was determined (via the influent into the laboratory activated sludge unit, concentrations ranging from 13 mg/L to 15.3 mg/L were introduced into the system) over a test period of 25 days. In the Coupled Units-Test (principle: combining two confirmatory test units) a biodegradation of 77% was determined over a test period of 42 days based on DOC measurements.

Conclusions:
In the OECD-Confirmatory-Test a biodegradation of 98% was determined (via the influent into the laboratory activated sludge unit concentrations ranging from 13 mg/L to 15.3 mg/L were introduced into the system) over a test period of 25 days. In the Coupled Units-Test (principle: combining two confirmatory test units) a biodegradation of 77% was determined over a test period of 42 days based on DOC measurements.

Description of key information

In the OECD-Confirmatory-Test a biodegradation of 98% was determined (via the influent into the laboratory activated sludge unit, concentrations ranging from 13 mg/L to 15.3 mg/L were introduced into the system) over a test period of 25 days. In the Coupled Units-Test (principle: combining two confirmatory test units) a biodegradation of 77% was determined over a test period of 42 days based on DOC measurements.

Key value for chemical safety assessment

Additional information