Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 5 Issue 3, 2003; Page No.(283-289 )

IMPROVED EFFICIENCY FOR THE REMOVAL OF CADMIUM FROM AQUEOUS SOLUTION USING CELLS OF THE CYANOBACTERIUM PHORMIDIUM ANGLISTISSIMUM PRE-TREATED WITH SODIUM HYDROXIDE

DUANGRAT INTHORN, NAMPHUNG DUNGKOKKRAUAD AND ARAN INCHAROENSAK

Abstract

The filamentous cyanobacterium Phormidium angustissimum was examined for its capacity to remove cadmium from aqueous solution using both non-treated and Na0H-treated cells. For non-treated cells the adsorption equilibrium was attained in 10 min and Cd removal ability was 81% with the optimum pH at 6.5. The maximum adsorption (ti ma,) of Cd was 116 mg/g dry wt. Pretreatment of cells by NaOH could increase the Cd removal ability and the adsorption equilibrium was also attained in 10 min. The presence of either Ca2+ or Mg2+ reduced the ability of the cells to remove Cd with a higher Cd removal ability observed for the Na0H-treated cells. A 2-fold increase in ti,nat value of 238 mg/g dry wt.was found for the NaOH treated cells.

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