Abstract
Abstract - Cultivation conditions and the process considerably influence the composition of microalgae. The objective of this study was to use CO 2 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) CO 2. The blend concentration was 1.6 g L -1 , and 20 and 40% (v/v) renewal rates were studied. Spir-ulina sp. LEB 18 presented the best kinetic results and the maximum biomass concentration and biopolymer yield when grown with CO 2 as the carbon source. Under the same conditions (10% (v/v) CO 2 ), the microalgae Spirulina sp. LEB 18 and Chlorella fusca LEB 111 exhibited maximum levels of protein, carbohydrates and lipids. Keywords : Bioproducts; Semi-continuous process; Sustainability. INTRODUCTION The rising price of fossil fuels, the environmental impact of gaseous emissions, the improper disposal of polymers of petrochemical origin and the waste of raw materials have led to the demand for renewable resources and technologies that meet the needs of the world market (Antunes and Silva, 2010). Microalgae are considered to be an efficient bio-logical system for capturing solar energy and for the production of organic compounds. Microalgae can be produced throughout the year, requiring little wa-ter compared to terrestrial plants. The biochemical composition of microalgae can be manipulated by changing the growth conditions and environmental stresses (Hu
Highlights
The rising price of fossil fuels, the environmental impact of gaseous emissions, the improper disposal of polymers of petrochemical origin and the waste of raw materials have led to the demand for renewable resources and technologies that meet the needs of the world market (Antunes and Silva, 2010).Microalgae are considered to be an efficient biological system for capturing solar energy and for the production of organic compounds
LEB 18 and Chlorella fusca LEB 111. The cultures of both types of microalgae grown with CO2 as the carbon source at a 20% renewal rate (b)
It did influence the results obtained for Chlorella fusca LEB 111
Summary
The rising price of fossil fuels, the environmental impact of gaseous emissions, the improper disposal of polymers of petrochemical origin and the waste of raw materials have led to the demand for renewable resources and technologies that meet the needs of the world market (Antunes and Silva, 2010).Microalgae are considered to be an efficient biological system for capturing solar energy and for the production of organic compounds. 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. Chlorella fusca LEB 111 cultures were studied, in which the carbon sources (Na2CO3 of the BG-11 medium and NaHCO3) were replaced by 10% (v/v) CO2.
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