1. Improvement on light penetrability and microalgae biomass production by periodically pre-harvesting Chlorella vulgaris cells with culture medium recycling.
- Author
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Huang, Yun, Sun, Yahui, Liao, Qiang, Fu, Qian, Xia, Ao, and Zhu, Xun
- Subjects
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BIOMASS production , *MICROALGAE cultures & culture media , *EFFECT of light on algae , *CHLORELLA vulgaris , *PHOTOBIOREACTORS , *ATTENUATION of light - Abstract
To improve light penetrability and biomass production in batch cultivation, a cultivation mode that periodically pre-harvesting partial microalgae cells from suspension with culture medium recycling was proposed. By daily pre-harvesting 30% microalgae cells from the suspension, the average light intensity in the photobioreactor (PBR) was enhanced by 27.05–122.06%, resulting in a 46.48% increase in total biomass production than that cultivated in batch cultivation without pre-harvesting under an incident light intensity of 160 μmol m −2 s −1 . Compared with the semi-continuous cultivation with 30% microalgae suspension daily replaced with equivalent volume of fresh medium, nutrients and water input was reduced by 60% in the proposed cultivation mode but with slightly decrease (12.82%) in biomass production. No additional nutrient was replenished when culture medium recycling. Furthermore, higher pre-harvesting ratios (40%, 60%) and lower pre-harvesting frequencies (every 2, 2.5 days) were not advantageous for the pre-harvesting cultivation mode. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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