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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

 Carboxylic acids, di-, C4-6 is considered to be readily biodegradable in surface waters and waste water treatment plants.

Key value for chemical safety assessment

Additional information

For the mixture no data on biodegradation in surface water and sediment are available. Adipic acid is applied for read-across approach.

Adipic acid is shown to be biodegradable in surface waters and waste water treatment plants. In a modified Zahn-Wellens-Test, using surface water from the river Main (Germany), 90% of adipic acid was degraded within 8 days (Zahn, 1980).

A waste water treatment simulation test was performed according to a method which is comparable to the OECD guideline 303 A ("Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units). Sludge from a municipal sewage treatment plant was used in this test. After 1 day a DOC removal of 99% was achieved (Gerike, 1979).

As it is shown that all constituents of the mixture are readily biodegradable, it is concluded that succinic acid and glutaric acid are also biodegradable in surface waters and waste water treatment plants.