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Research has been conducted to determine the rate of growth of freshwater microalgae from South Sumatra swamp waters in BG11 medium with the addition of CO2 in a simple bioreactor. Two types of microalgae used are Nanochloris sp. and Chlorella sp. This study used a Randomized Block Design with 3 treatments (control, addition of aerators and addition of aerators and CO2). Growth medium is BG11 Medium with 1500 ml volume. CO2 gas is added as much as 36 BPM, for 60 minutes per day. Bioreactors are exposed outdoors in 12-hour solar lighting. Growth rate is measured by Optical Density (OD) method. The results showed that the addition of CO2 had a significant effect and was able to increase the growth rate of Nanochloris sp and Chlorella sp by 336% and 226% respectively over 12 days of culture compared to controls.