Removal of cadmium (II) ion from aqueous system by dry biomass, live and heat- inactivated Scenedesmus quadricauda isolated from fresh water (Apa Dam Lake)

Abstract

Today various organisms are increasingly used to remove toxic heavy metals from waters. In particular, studies in which various species of hydrophilic organisms are used for metal removal report various results. In this study, Scenedesmus quadricauda which has wide distribution in natural waters was used. The alga sample used in the study was isolated from Apa Dam Lake (Konya/Turkey) and was reproduced in culture. After the pure culture obtained, the removal of Cadmium in water was examined in three different conditions of the organism. In the stages of study, direct living organism, inactivated biomass and dead biomass were used, respectively. The rate of Cd ion in the water was diluted down to 0,02-0,30mg/lt so that the amount of Cd ion measured can match with the measuring range of the spectrophotometer used. At stabile temperatures, the pH was kept between 6 and 8. The measurements were conducted periodically: every six hours for four days. As a result, the highest biosorption was in inactive biomass, which is followed by dead biomass and living organisms. Moreover, it was also found out that this species is very effective in the removal of heavy metal. Besides, the samples mentioned above were filtered in appropriate filter paper and their weight was measured to increase the reliability of the study. It was observed that the masses of the samples increased in parallel with absorption amount