Removal of Bi(III) and Zn(II) by nonliving Streptomyces rimosus biomass from nitric solutions

Y. Bal1*, K.E. Bal1 and A. Lallam2

1 Dpt of Chemical Engineering, University of Medea, Medea, Algeria
2 E.N.S.I.T.M, Université de Haute Alsace, Mulhouse, France

Received 26 June 2002; accepted 8 January 2003


The study reports the Bi3+ and Zn2+ species sorption onto various adsorbents from nitric synthetic solutions, a typical representative of waste effluents derived from non valid drugs lixiviate. Solid-liquid batch experiments carried out at 25°C to assess the adsorptive capacity of the sorbents indicate that nonliving Streptomyces rimosus biomass uptakes the metal species from solutions containing up to 100mg/l, at pH 1.9, at relatively fast kinetics. The biosorbent was loaded with about 7mg/g of Bi3+ and 15mg/g of Zn2+ after 2 hours contact time. Similar results were obtained with the mineral active carbon and the C25 strong cation exchanger. It was also found that prior treatment of the biosorbent with dilute solution of NaOH improved the sorption capacity of Bi3+ to up to 10mg/g. F.T.I.R spectra of the biomaterial gave bands which were assigned to potential binding groups of the amide I and amide II types, primary alcohol at C-6 and secondary alcohol at C-3. Characteristic related peaks were respectively observed at 3272-2950-2923, 1621-1536, 1010 and at 1409cm-1. When adsorbed, both metal ions were quantitatively eluted and the biosorbent material regenerated by aqueous solutions of NaCl, 10g/l. Elution of Bi3+ ion was also obtained with nitric solution of Zn2+, 1g/l.

Keywords: Biosorption; Streptomyces rimosus; Bi3+; Zn2+

* Corresponding author
   E-mail : bal_y@yahoo.fr