Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 325, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.116582
Keywords
Microalgae biofilm; Multifactorial kinetic model; Heterotrophic-assisted photoautotrophic growth; Substrate consumption; CO2 reduction
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This study developed an integrated kinetic model that considers multiple factors for the growth of heterotrophic-assisted photoautotrophic microalgae biofilm. The model showed a high level of agreement with experimental results and could reasonably predict the growth rate of microalgae biofilm under different growth conditions.
Heterotrophic-assisted photoautotrophic microalgae biofilm cultivation was an alternative way to realize CO2 reduction and wastewater treatment. Growth kinetics supplied a channel to better understand how the culti-vation conditions affect microalgal growth and CO2 reduction. However, the two growth modes (heterotroph and photoautotroph) have different needs for organic and inorganic nutrients. Thus, combining the threshold theory and multiplication theory, an integral multifactorial kinetic model that looking insight into the comprehensive effect of glucose, CO2, light intensity, and nitrate was developed for heterotrophic-assisted photoautotrophic microalgae biofilm growth in this study. R2 between model and experiment was 0.99. It predicted the maximum specific growth rate and maximum CO2 consumption rate of heterotrophic-assisted photoautotrophic microalgae biofilm was 1.868 h-1 and 1.02 h-1, respectively. This model fully explained the influence of the main factors on microalgae biofilm growth and reasonably predicted the growth rate of microalgae biofilm under different growth conditions.
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