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Modeling the light attenuation phenomenon during photoautotrophic growth of A. variabilis ATCC 29413 in a batch photobioreactor
Author(s) -
Salleh Siti Fatihah,
Kamaruddin Azlina,
Uzir Mohamad Hekarl,
Mohamed Abdul Rahman,
Shamsuddin Abdul Halim
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5013
Subject(s) - photobioreactor , attenuation , irradiance , blue light , light intensity , biological system , attenuation length , irradiation , chemistry , biophysics , environmental science , materials science , optics , physics , biology , biomass (ecology) , ecology , nuclear physics
BACKGROUND Light attenuation in a photobioreactor is an inevitable phenomenon, which creates a heterogeneous radiation field inside the culture. However, few investigations have been carried out on the modeling of periodic light during cyanobacterial cell growth, despite the strong effect of the attenuating light irradiance on cell growth kinetics. The purpose of this work is to analyze the available growth models (Monod, Aiba‐Edwards and Haldane) and to then develop a model that incorporates light attenuation phenomenon. RESULTS The inhibitory Haldane model was found to be the best model to represent the current experimental data with μ max , K sI and K iI selected as 0.25 h −1 , 190 µE m −2 s −1 and 850 µE m −2 s −1 , respectively. A new light attenuation model was successfully developed by establishing the relationship between the attenuated light irradiance and the cell concentration. It is applicable to a broad range of light irradiances from 25 to 910 µE m −2 s −1 . CONCLUSION Light inhibition and attenuation imposed significant effects on cyanobacterial growth. The newly developed light attenuation model offers various possible future applications, which include automatic monitoring of the instantaneous cell concentration without the need for manual sampling, and effective optimization of the specific irradiation rate in indoor cultures. © 2016 Society of Chemical Industry