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Sorption Effectiveness of Nannochloropsis salina Towards Mn2+ Ion in Different Salinity Waters

Research on sorption effectiveness of Nannochloropsis salina towards Mn 2+ ion in different salinity waters has been carried out. This research was conducted to observe the effectiveness of N. salina as biosorbent for Mn 2+ pollutants in waters. Addition of Mn 2+ ion with concentrations of 2, 4, and 8 ppm respectively, was conducted at the beginning of the  N. salina growth in Conwy Medium. Those variations were conducted at salinity of 5‰ and 30‰, aeration, continuous illumination, and also at temperature of 20 o C. The N. salina growth after addition of metal ion was observed every day using haemocytometer and the concentration of metal ion after adsorption was determined by atomic absorption spectrophotometer. Results showed that the optimum time for growth of N. salina as a control was obtained on day 8 th at 30‰  salinity while at 5‰  salinity was obtained on day 15 th except for 8 ppm Mn 2+ was obtained on day 19 th . The maximum  removal efficiency of Mn 2+ with the concentrations of 2; 4; and 8 ppm at 30‰  salinity medium was 52.50; 59.25 and 55.38% respectively and for 5‰  salinity, the maximum removal efficiency of Mn 2+ concentrations of  2, 4 and 8 ppm were 65.50; 64.66 and 67.20% respectively. The optimum time for growth of N. salina at 5‰ salinity medium is higher than at 30‰ salinity but the removal efficiency is conversely associated.