Process Biochemistry, Vol.31, No.5, 457-462, 1996
Metal Removal by Selected Sorbents
The sorption of Ni from aqueous solution using fly ash, CaCO3 and sawdust preparations from pine (Pinus roxburghii) and cedar (Cedrus deodara) was investigated. Fly ash with a total of 90% Ni removal, was superior to CaCO3 (55%), sawdust from cedar (63%) orpine (41%) within 30 min. Fly ash was also an effective sorbent for Cd (79%) and Cu (75%). Ni was sequestered significantly by the dead biomass of Pseudomonas (60%) or Nostoc (41%) or Rhodopseudomonas (35%). Freundlich constants (K-F) based on the Freundlich isotherm of all the sorbents were in the sequence : fly ash (213.8) > Pseudomonas (169.8) > NoStoc (131.8) >sawdust from cedar (64.57) > CaCO3 (56.23) > Rhodopseudomonas (51.29) >sawdust from pine (44.67). The observations indicate the possible cost-effective deployment of fly ash, carbonates of calcium and plant parts with native resins as metal sorbents.