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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

Endpoint:
biodegradation in water: sewage treatment simulation testing
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1991
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: fehlt noch

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report Date:
1991

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Hostapur SAS 93
- Physical state: solid
- Analytical purity: 93%
- Composition of test material, percentage of components: 100% Hostapur SAS 93
- Lot/batch No.: no data

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): activated sludge collected from a treatment works receiving predominantly domestic sewage (sewage treatment plant Niederrad)
Duration of test (contact time):
48 d
Initial test substance concentrationopen allclose all
Initial conc.:
1 other: L/h
Based on:
test mat.
Initial conc.:
5 - 20 mg/L
Based on:
other: Carbon
Parameter followed for biodegradation estimation:
DOC removal
Details on study design:
TEST CONDITIONS
- Composition of medium: synthetic wastewater with nutrient solutions according to OECD Guideline

TEST SYSTEM
- Culturing apparatus: OECD confirmatory test apparatus
- Number of culture flasks/concentration: 1

Results and discussion

% Degradation
% Degr.:
96.2
St. dev.:
2.55
Parameter:
DOC removal
Sampling time:
34 d
Transformation products:
not measured

Applicant's summary and conclusion

Conclusions:
A biological degradation of 96.2 ± 2.55 % was reached after the initial 14-day equlilibration period, where increasing amounts of test item were added to the test system.
Executive summary:

The ultimate biodegradability of Sulfonic acids, C13-17-sec-alkane, sodium salts was assessed in the aerobic sewege treatment simulation test using activated sludge units (OECD 303A). After the intial 14 -day equilibration period, where increasing amounts of test item were added to the test system, a degradation of 96.2 ± 2.55 % was achieved throughout the study period, as determined by daily DOC measurements over 34 days.

These results indicate that Sulfonic acids, C13-17-sec-alkane, sodium salts can be regarded as well biodegradable under conditions of the test.