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Cultivation conditions and the process considerably influence the composition of microalgae. The objective of this study was to use CO2 as a carbon source in semi-continuous cultivation of Spirulina sp. LEB 18 and Chlorella fusca LEB 111 and to evaluate the influence of the renewal rate on the biomass composition and production of these microalgae. Spirulina sp. LEB 18 and Chlorella fusca LEB 111 were cultivated with 10% (v/v) CO2. The blend concentration was 1.6 g L-1, and 20 and 40% (v/v) renewal rates were studied. Spirulina sp. LEB 18 presented the best kinetic results and the maximum biomass concentration and biopolymer yield when grown with CO2 as the carbon source. Under the same conditions (10% (v/v) CO2), the microalgae Spirulina sp. LEB 18 and Chlorella fusca LEB 111 exhibited maximum levels of protein, carbohydrates and lipids

UTILIZATION OF CO2 IN SEMI-CONTINUOUS CULTIVATION OF Spirulina sp. AND Chlorella fusca AND EVALUATION OF BIOMASS COMPOSITION