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EC number: 212-974-6 | CAS number: 894-86-0
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Indigo Küpe reacts spontaneously with water and/or air to form indigo and sodium hydroxide. Indigo is not readily biodegradable. However, tests for colour and COD removal show that it can be to more than 90% removed within up to 60 days using anaerobic bacteria.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable, not fulfilling specific criteria
Additional information
Indigo Küpe reacts spontaneously with water and/or air to form indigo and sodium hydroxide. Indigo is not readily biodegradable. However, anaerobic and aerobic treatment of the textile effluent were both effective in reducing the wastewater colour within 45 and 90 days, respectively. However, anaerobic treatment generally produced the greatest colour removal (68-97%) at a much shorter time. Peptostreptococcus spp. and B. fragilis because of their relatively higher pH-tolerance can be used together with E. coli for the efficient decolourization and degradation of textile effluents containing Indigo dye.
In a further test, using a mixed culture of anaerobic bacteria of a sewage plant in a semi-continuous bioreactor, colour removal of up to 95% and COD removal of up to 90% could be achieved within 60 and 50 days of incubation, respectively.
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