Abstract
Differential mass balance of dissolved oxygen (DO) in algal culture layer flowing down an inclined open cultivation surface was set up. Using simplified aussumptions, a differential equation was derived for the course of DO concentration profile across algal culture layer. In the development of the equation were considered: hydraulics of culture flow on cultivation surface, rate of O 2 evolution by algae, molecular diffusivity and turbulent diffusivity of oxygen inside of layer. The equation was integrated numerically for apporopriate boundary conditions. Computations performed for 6 mm thick layer of the alga Chlorella kessleri, flowing at velocity 50 cms -1 on inclined cultivation surface (inclination 1.7 %) in 28 m long and 4 m wide outdoor culture unit revealed that main restistance against DO mass transfer from algal culture into atmosphere was found in boundary layer of culture near algal culture - atmosphere interface. Thickness 8 of the boundary layer was only several percent of thickness of the whole culture layer and was proportional to the square root of: culture temperature and mean DO concentration in the bulk of algal culture. Computations showed that turbulence in algal culture on cultivation surface was sufficient to create almost uniform DO transversal (across algal culture layer) profile outside boundary layer δ.
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