Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Reactive Brown DYHY 0331/0334 displays a low ready biodegradability in that it achieved 6% biodegradation in a ‘Manometric Respirometry Test’. In a test for inherent biodegradability (Modified MITI Test (II)), the test substance was primary biodegradable (45% based on BOD; 49% DOC removal) but not ultimate biodegradable, and was hence not considered to be inherent biodegradable. Microbial decolourization of azo dyes in an anaerobic environment occurs as a result of reduction of azo bonds, leading to decolourized metabolites. No ready biodegradation of these metabolites is expected in the anaerobic system. However, these metabolites could be further diminished by means of either biodegradation or autoxidation under subsequent aerobic treatment. The mixed bacterial cultures decolorized three structurally dissimilar azo dyes, suggesting that anaerobic decolourization was not a specific process (Supaka 2004). It was clear that the majority of the colour removal occurred in the anaerobic stage.
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