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1 2005

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Study of the biodegradability of sodium salt from the condensation product of naphthalene sulphonic acids and formaldehyde

Ladhari N., Hayet G., Harrabi L.

Autex Research Journal

2005

Vol. 5, no. 2

113--119

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.