Abstract:
Chlorella sp. was cultured in NS III media under the following conditions: 3,000 lux, 30 degree celcius, 12-12 hours of light-dark period and 6.6 of pH media. The specific growth rate was 1.90+-0.29 per day. The low tolerant pH limit is less than 4.60. The specific growth rate in media with different value; 4.70, 5.10, 5.60, 6.10 and 6.60, are not significant difference (p = 0.05). The specific growth rate in media with varies concentration of nitrate and phosphate was highest in the media with nitrate concentration 10.00 millimol/l and phosphate concentration 1.69 millimol/l. The efficiency of carbon dioxide reduction in the media with 5.00 g/l dry ice addition was 95.35%. The rate of carbon biomass production can be expressed as carbon biomass (mg/l) = 4.78 (CO2(aq))2-71.89CO2(aq)+296.54 (r2 = 0.95). Chlorella in media with dry ice 10 g/l showed the highest efficiency to change carbon dioxide to biomass