CADMIUM REMOVAL BY IMMOBILIZED AND FREE CELLS OF NOSTOC PALUDOSUM AND RIVULARIA SP.DUANGRAT INTHORN, SIRIPORN SOMBATJINDA, DANAYA WONGSIRIKUL AND CHALERMRAJ WANTAWINAbstract Cadmium removal from aqueous solution by immobilized and free cells were tested with 5 strains of cyanobacteria: Nostoc paludosum, Phormidium angustissimum, Nostoc commune, Nostoc micropicum and Rivularia sp. Of these, the highest cadmium removal capability was found with immobilized and free cells of Nostoc Paludosum (88% vs 86%, respectively) and of Rivularia sp. (99% vs 97%, respectively). Moreover, these organisms had relatively high growth rate. Immobilized cells of Nostoc paludosum before use to remove cadmium had higher cadmium removal capability than the free cells counterparts (91% vs 75%) and similar results were found with Rivularia sp. (98% vs 96%). With the air bubble system aeration cadmium removal was higher than that with the shaker system aeration. Cadmium removal by immobilized cells and free cells of Nostoc paludosum performed with the shaker system aeration was found to be 88% and 76%, respectively and that with the air bubble system aeration was 96% and 96%, respectively. Similarly, cadmium removal by immobilized cells and free cells of Rivularia sp. performed with the shaker system aeration was found to be 97% and 93%, respectively and that with the air bubble system aeration was 97% and 98%, respectively.
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