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The biodegradability of dispersants (naphthalenesulfonate formaldehyde condensates),  used with disperse dyes, has been evaluated using different techniques such as chemical  oxygen demand (COD), UV-spectroscopic analysis and tonometry. A biomass was used  from industrial waste water which was acclimated for six months prior to use. The study  has shown that biodegradation involves two steps: first, the cleavage of the CH2 bridges;  second, the degradation of the aromatic nuclei. We identified a series of bacteria  (Pseudomonas cepacia, Pseudomonas vesicularis, Pseudomonas stutzeri,  Pseudomonas pichetti, Shevanella putrefacians, Agrobacterium radiobacter and  Aeromonas hydrophila) that proved to biodegrade the dispersant very efficiently .

STUDY OF THE BIODEGRADABILITY OF SODIUM SALT FROM THE CONDENSATION PRODUCT OF NAPHTHALENE SULPHONIC ACIDS AND FORMALDEHYDE