A. Toumi

Cadi Ayyad University, Maraksh, Marrakech-Tensift-Al Haouz, Morocco

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Publications (3)4.82 Total impact

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    ABSTRACT: Heavy metals (Zn and Cd) effect and their bioaccumulation by a microalga Micractinium pusillum were investigated. Results showed that Cd was more toxic than Zn on Micractinium pusillum. Indeed, inhibitory concentrations of 50% of alga population in 72h (IC50,72h) were 0.28 and 0.34 mg l−1 respectively for Cd and Zn. On the other hand, metal extracted rates from medium solution were more important for Zn than for Cd, essentially for the two first concentrations tested (0.06 and 0.12 mg l−1). Furthermore, Zn and Cd extracted proportions were more important for the low concentrations tested and decreased progressively with increasing concentrations applied. This mechanism of extraction corresponds principally to their biosorption by Micractinium pusillum.
    Environmental Technology 01/2007; 28(1). · 1.61 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Heavy metals (Zn and Cd) effect and their bioaccumulation by a microalga Micractinium pusillum were investigated. Results showed that Cd was more toxic than Zn on Micractinium pusillum. Indeed, inhibitory concentrations of 50% of alga population in 72h (IC50,72h) were 0.28 and 0.34 mg l−1 respectively for Cd and Zn. On the other hand, metal extracted rates from medium solution were more important for Zn than for Cd, essentially for the two first concentrations tested (0.06 and 0.12 mg l−1). Furthermore, Zn and Cd extracted proportions were more important for the low concentrations tested and decreased progressively with increasing concentrations applied. This mechanism of extraction corresponds principally to their biosorption by Micractinium pusillum.
    Environmental Technology 12/2006; 28(1):19-23. · 1.61 Impact Factor
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    ABSTRACT: Removal of heavy metals (Zn, Cu, Pb, Cd and Cr) by an integrated wastewater treatment system, Two Phase Anaerobic Reactor (RAP) - High Rate Algal Pond (HRAP), was investigated. Results indicate a good reduction of these micro-pollutants by this system. Global elimination rates of treatment system are 80%, 87%, 38%, 60% and 63%, respectively for Zn, Cu, Pb, Cd and Cr. Primary treatment (RAP) was not involved in this reduction. Metal concentrations detected in RAP effluent are higher than those detected in raw wastewater. However, the essential metal removal was ensured by the HRAP and thetwo maturation ponds. Sedimentation of metals adsorbed on suspended matters is the principal factor that intervened in metal elimination by these ponds. Indeed, metal analysis of wastewater dissolved and particulate fractions showed that the majority of these cations was in particulate fraction, notably for Zn, Cu, Cd and Cr. Their distribution between these fractions evolved towards their solubilization, during the treatment. Otherwise, metal sediment analysis of different ponds showed that sludges accumulate important quantities of metals, especially in RAP sludges. Thereafter, Zn, Cu and Cd concentrations increased in HRAP sludges, but Pb and Cr contents decreased. However, in maturation pond sludges metal quantities are lower. On the other hand, metal contents in sludges are variable from upstream to downstream of each pond.
    Environmental Technology 03/2003; 24(2):153-9. · 1.61 Impact Factor

Publication Stats

7 Citations
4.82 Total Impact Points

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Institutions

  • 2006
    • Cadi Ayyad University
      Maraksh, Marrakech-Tensift-Al Haouz, Morocco
  • 2003
    • Faculté des Sciences et Techniques Marrakech
      Maraksh, Marrakech-Tensift-Al Haouz, Morocco