Journal
BIORESOURCE TECHNOLOGY
Volume 216, Issue -, Pages 669-676Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.011
Keywords
Microalgae; Photobioreactor; Light penetrability; Periodically pre-harvesting; Light attenuation
Funding
- State Key Program of National Natural Science of China [51136007]
- International Cooperation and Exchange of the National Natural Science Foundation of China [51561145013]
- Chinese Ministry of Education [113053A]
- Fundamental Research Funds for the Central Universities [106112015CDJXY140003]
- Postdoctoral Scientific Research Project of Chongqing, China [Xm2015070]
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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 mu mol 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. (C) 2016 Elsevier Ltd. All rights reserved.
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