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  1. Activated carbon removal efficiency of microcystins in an aqueous cell extract of Microcystis aeruginosa and Oscillatoria tenuis strains isolated from Egyptian freshwaters.

    Article - En anglais

    The efficiency of absorption for microcystins (MCYSTs) produced by Egyptian strains of Microcystis aeruginosa and Oscillatoria tenuis, using different kinds of granular and powdered activated carbons, was evaluated by determining the adsorption isotherms (Kf and 1/n) for each carbon.

    Aqueous extracts of cyanobacterial cells containing MCYST at pH 8.5 were used because this pH mimics the Egyptian freshwater environment from which the strains were isolated.

    Extracts from each strain containing 2 mg/L microcystin, as determined by ELISA, were placed in 45 mL brown bottles containing activated carbon at 100-500 mg/L. The bottles were rotated at 16 rpm, at 22 ± 1°C for 7 days.

    Results showed that, under these conditions, powdered activated carbons (PACs) were more efficient than granular activated carbons (GACs) in removing microcystins.

    Wood-based GAC and PAC were the most effective microcystin adsorbents.

    Nonactivated carbon was not suitable for adsorption of microcystins.

    MCYSTs from extracts of M. aeruginosa (MCYST-RR. - YR, and - WR) were adsorbed significantly better than MCYSTs from extracts of O. tenuis (MCYST-LR and - LHarg) with all of the activated carbons tested.

    Mots-clés Pascal : Toxicité, Foie, Lutte chimique, Isotherme adsorption, Santé et environnement, Extrait cellulaire, Microcystis aeruginosa, Cyanobacteria, Bactérie, Charbon actif, Egypte, Afrique, Milieu eau douce, Efficacité traitement, Traitement eau potable, Toxine, Heptapeptide, Oscillatoria tenuis, Microcystine

    Mots-clés Pascal anglais : Toxicity, Liver, Chemical control, Adsorption isotherm, Health and environment, Cell extract, Microcystis aeruginosa, Cyanobacteria, Bacteria, Activated carbon, Egypt, Africa, Freshwater environment, Treatment efficiency, Drinking water treatment, Toxin, Heptapeptide

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0328753

    Code Inist : 002A05B10. Création : 16/11/1999.