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MODEL OF BIOLOGICAL ASSIMILATION OF CO2 AND O2 PRODUCTION THROUGH THE GROWTH OF THE MICROALGA SCENEDESMUS DIMORPHUS IN SEMI-CONTINUOUS CULTIVATION IN AN AIRLIFT BIOREACTOR.

La asimilación biológica de CO2 por la microalga Scenedesmus dimorphus se modeló en un cultivo semicontinuo dentro de un reactor airlift. Los datos experimentales se obtuvieron de un proceso experimental previo, donde se cultivó la microalga mencionada anteriormente utilizando el gas de combustión de una caldera de vapor. El modelo matemático obtenido en esta investigación se realizó mediante balance de masa, involucrando la transferencia de masa de CO2, la velocidad de formación del ion HCO3-, la capacidad de carga de la microalga, la intensidad de luz, el pH del cultivo y la producción de O2. El modelo propuesto reprodujo los valores de biomasa obtenidos experimentalmente ya que se obutvo un valor de R2 máximo de 0.995. Los experimentos se realizaron en seis cultivos, donde la intensidad de luz se evaluó en 27, 60.7 y 76.3 mmol m-2 s-1, utilizando ciclos luz oscuridad de 14/10, 16/8 y 24/0 h. El flujo de gas que se utilizó fue de 0.275 L min-1. En la simulación de O2 disuelto se observó que la concentración máxima se encontró entre 50 y 150h de cada experimento.
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MODEL OF BIOLOGICAL ASSIMILATION OF CO2 AND O2 PRODUCTION THROUGH THE GROWTH OF THE MICROALGA SCENEDESMUS DIMORPHUS IN SEMI-CONTINUOUS CULTIVATION IN AN AIRLIFT BIOREACTOR.

  • DOI: https://doi.org/10.22533/at.ed.317492414036

  • Palavras-chave: modelado, microalga, bioreactor airlift, cultivo semicontinuo

  • Keywords: modelling, microalga, airlift bioreactor, semicontinuous culture

  • Abstract: The biological assimilation of CO2 by the microalga Scenedesmus dimorphus was modeled in a semicontinuous culture inside an airlift reactor. The experimental data was obtained from an experimental process, where the aforementioned microalga was grown using combustion gases from a steam boiler. The mathematical model obtained in this research was carried out using mass balance, involving the mass transfer of CO2, the formation rate of the HCO3- ion, the carrying capacity of the microalga, the intensity of light, the pH of the cultivation and O2 production. The proposed model reproduced the biomass values obtained experimentally, since a maximum R2 value of 0.995 was obtained. The experiments were done in six cultures where the light intensity was evaluated at 27, 60.7 and 76.3 µmol m-2 s-1, using light/dark cycles of 14/10, 16/8 and 24/0. The gas flow used was of 0.275 L min-1. In the simulation of dissolved O2 it was observed that the maximum concentration was found between 50 and150 h of each experiment.

  • Citlalli Adelaida , Arroyo Gómez
  • Jose Luis Contreras Larios
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