Journal
BIORESOURCE TECHNOLOGY
Volume 340, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125745
Keywords
Microalgae; Phosphorus; Uptake and distribution; Phosphorus concentration; Light; dark condition
Funding
- National Natural Science Foundation of China [52070173]
- Fundamental Research Funds for the Central Universities [201964005]
- Qingdao Science and Technology Benefit People Demonstration and Guidance Project [21-1-4-sf-12-nsh]
- Urban and Rural Housing Construction Science and Technology Project of Shandong [2021-K8-7]
- China Scholarship Council-International clean energy innovation talent (iCET) program
- Biodesign Swette Center for Environmental Biotechnology in Biodesign institute of Arizona State University
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The study found that different P concentrations and light/dark conditions significantly influenced the distribution and transformation of P in microalgae, with high P concentration promoting luxury uptake of IP and conversion to OP, while low P concentration mainly led to accumulation of IP in EPS and OP in IPS.
In this study, the effects of P concentration and light/dark condition on the distribution of P in microalgae were tracked with Scenedesmus sp.393. Results showed that different culture conditions affected the accumulation capacity and transformation of P in intracellular polymeric substances (IPS), extracellular polymeric substances (EPS), and soluble microbial products (SMP). At low P concentration (0.70 mg P/L), inorganic phosphorus (IP) absorbed in EPS (19.40%) and organic phosphorus (OP) accumulated in IPS (70.98%) were mainly P forms in microalgae. High P concentration (>21.42 mg P/L) promoted the luxury uptake and accumulation of IP by IPS, and the conversion of IP to OP. However, the adsorption of IP by EPS was inhibited when exposed to high external P concentration. Continuous illumination promoted the microalgae growth, and dark condition stimulated the P accumulation in microalgae biomass. The results of this study could provide valuable information for P recovery with microalgae.
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