Productivity of Arthrospira platensis Gomont 1892 culture under natural light conditions
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Abstract
The growth of the Arthrospira platensis batch culture under natural and artificial illumination at different culture layer depth and the amount of photosynthetically active radiation (PAR) energy supplied to the pond surface were investigated. The experiments were conducted in horizontal photobioreactor during 2021–2022 in the Sevastopol area. The calculation of the average A. platensis culture productivity in the linear growth area and the maximum culture density at the stationary phase was carried out. It was shown that under natural illumination, the average A. platensis culture productivity in the linear growth phase varied between 2.8 and 12.2 g DW∙m-2 ∙day-1, with a maximum culture density varying from 43 to 120 g DW∙m-2. Taking into account the partial light reflection from the surface of the algobiotechnological unit, the total value of solar energy in the PAR area per day was determined, which ranged from 1.95 to 8.73 MJ∙m-2 in January and July, respectively. It was noted that A. platensis cultivated in the ponds with different culture layer depth yields in 7 days were the same and amounted to 70–75 g DW∙m-2. In the control experiment under artificial illumination, no effect of CO2 on the growth rate of A. platensis was detected: average productivity was 13–14 g DW∙m-2 ∙day-1 both with CO2 addition and without it, the maximum culture density was 125 g DW∙m-2. Based on the analysis of the obtained experimental and published data, it was shown that the dependence of average productivity on irradiance in the PAR area can be described by a polygonal line. In the light limitation area, the slope ratio of the linear regression was 2.3 g∙MJ-1. Considering the average biomass caloric content, the average photosynthesis efficiency was 5.3 %.
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References
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