REMOVAL OF CADMIUM (II) ION FROM AQUEOUS SYSTEM BY DRY BIOMASS, LIVE AND HEAT-INACTIVATED OOCYSTİS SOLİTARİA ISOLATED FROM FRESH WATER (BEYKAVAGI POND)

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, Oocystis solitaria which has wide distribution in natural waters was used. The alga sample used in the study was isolated from Beykavagı Pond (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. It was also found out that this species is very effective in the removal of heavy metal. Moreover, using the same system, Oocystis solitaria and Scenedesmus quadricauda were compared in terms of their capacites for heavy metal adsorption.