engleski

Determination of light intensity in marine algae cultivation photobioreactor

A tubular photobioreactor has been designed for simulation of natural conditions in cultivation of marine algae. Parameters in the bioreactor space are recorded by a light sensor, a sensor of quantity of oxygen dissolved, a pH sensor and a temperature sensor. Optimum conditions are attained by automatic regulation of introduction of CO2 and air, and by regulation of temperature of the cooling/heating medium that circulates around the reactor mantle. The regulation is based on data recorded by the sensors. The intensity of the light provided by lamps placed next to the photobioreactor mantle can be measured vertically by height and horizontally by circular cross section. This is an essential indicator of the effect of hydrodynamics on algae density and its distribution in the reactor space. Furthermore, it provides an insight into hydrodynamic flows generated by the mixer and into non-stationary conditions formed that determine the level of the hydrodynamic stress. The computer program for determination of light intensity has been based on the Lambert – Berr law, and has been made in the MathCad mathematical tool. The light intensity is measured by a sensor connected to the computer, so that the changes in intensity due to algae growth can be traced numerically and graphically. This provides the necessary input data for the program. The algorithm includes the calculation of light intensity (I) relative to radius (r) at a specified height (H=const.) and mass density of the biomass (X).

light intensity; photobioreactor

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