Document Type : Original Article
Authors
1
Department of Chemical Engineering, Faculty of engineering, University of Bojnord, Bojnord, Iran
2
Department of Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
3
Department of Chemical Engineering, Faculty of Engineering, University of Bojnord, Bojnord, Iran.
10.22034/ijche.2023.383521.1283
Abstract
Spectral conversion of light and production of more useful photons for the photosynthesis process increases the growth of photosynthetic microorganisms including microalgae. Many researches have been done in this field, but due to the geometry of the cultivation system, the location of the light source, the failure to return photons into the system, etc., an accurate assessment of the effect of the spectral conversion on the growth of microalgae has not been provided. In this research, the effect of spectral conversion on the growth rate of microalgae Chlorella sp. has been evaluated using a more accurate method than other studies. For this purpose, a white LED lamp was placed inside a double-walled transparent tube as a light source, and the space between the walls was filled with Rhodamine 6G solution as a spectral converter. The whole above system was placed in the middle of a culture flask, in order to distribute the light homogeneously. In addition, the outer surface of the culture flask was covered with aluminum foil in order to minimize the photons leaving the flask and returning them inside. The results showed that in this method, the biomass productivity of Chlorella sp. microalgae increased up to 220%. The amount of this increase in more light intensity has been significantly less. In addition, the amount of light photons used in biomass production also increased up to 4 times.
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