Ben Ouada S., Ben Ali R., Cimetiere N., Leboulanger Christophe, Ben Ouada H., Sayadi S. (2019). Biodegradation of diclofenac by two green microalgae : Picocystis sp. and Graesiella sp.. Ecotoxicology and Environmental Safety, 186, p. art. 109769 [9 p.]. ISSN 0147-6513.
Titre du document
Biodegradation of diclofenac by two green microalgae : Picocystis sp. and Graesiella sp.
Ben Ouada S., Ben Ali R., Cimetiere N., Leboulanger Christophe, Ben Ouada H., Sayadi S.
Source
Ecotoxicology and Environmental Safety, 2019,
186, p. art. 109769 [9 p.] ISSN 0147-6513
The aim of the present study was to provide an integrated view of algal removal of diclofenac (DCF). Two isolated microalgal strains Picocystis sp. and Graesiella sp. were cultivated under different DCF concentrations and their growth, photosynthetic activity and diclofenac removal efficiency were monitored. Results showed that DCF had slight inhibitory effects on the microalgal growth which did not exceed 21% for Picocystis and 36% for Graesiella after 5 days. Both species showed different patterns in terms of removal efficiency. In presence of Picocystis sp., the amounts of removed DCF were up to 73%, 43% and 25% of 25, 50 and 100 mg L-1 respectively; whereas only 52%, 28% and 24% were removed in the presence of Graesiella at same DCF tested concentrations. DCF removal was insured mainly by biodegradation. To better reveal the mechanism involved, metabolites analyses were performed. Two DCF biodegradation/biotransformation products were detected in presence of Picocystis. This study indicated that Picocystis performed a satisfactory growth capacity and DCF removal efficiency and thus could be used for treatment of DCF contaminated aqueous systems.
