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Optimizing light distribution and controlling biomass concentration by continuously pre-harvesting Spirulina platensis for improving the microalgae production
- Liu, Huan, Chen, Hongjun, Wang, Shan, Liu, Qing, Li, Sen, Song, Xueer, Huang, Jiaojiao, Wang, Xin, Jia, Lishan
- Bioresource technology 2018 v.252 pp. 14-19
- Arthrospira platensis, algae culture, biomass production, culture media, models, photobioreactors, recycling
- To improve the microalgae production in batch cultivation, a cultivation mode that continuously pre-harvesting Spirulina platensis from photobioreactor (PBR) with culture medium recycling was proposed. For realizing the continuously pre-harvesting cultivation mode, a Spirulina platensis culture column PBR with overflowing device was designed, which could adjust pre-harvesting rate through the overflowing device. By adjusting the pre-harvesting rate, the biomass concentration could be kept when biomass accumulation and pre-harvesting biomass were equal. Hence, the meridional light attenuation could be reduced by controlling biomass concentration in PBR. The maximum microalgae production were 44.6%, 10.98% higher in total production than that cultivated in batch cultivation without pre-harvesting and periodically pre-harvesting cultivation mode respectively, which was realized in pre-harvesting rate 0.228 mL min−1 and biomass concentration 1.8 g L−1. Besides, a model was built by mass balance and polynomial fitting for evaluating the continuously pre-harvesting cultivation mode.