Improving sedimentation and lipid production of microalgae in the photobioreactor using saline wastewater

•Saline wastewater greatly improved microalgae sedimentation in PBR.•The mechanism of microalgae sedimentation changed with the influent salinity.•Microalgae achieved the highest lipid productivity at salinity of 1.0%.•Saturation of microalgae fatty acids increased with the increase of salinity. Sal...

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Bibliographic Details
Published in:Bioresource technology 2022-03, Vol.347, p.126392-126392, Article 126392
Main Authors: Yang, Zi-Yan, Gao, Feng, Liu, Jun-Zhi, Yang, Jin-Sheng, Liu, Mei, Ge, Ya-Ming, Chen, Dong-Zhi, Chen, Jian-Meng
Format: Article
Language:English
Subjects:
Biomass
Chlorella
Fatty Acids
Lipid accumulation
Microalgae
Photobioreactor
Photobioreactors
Saline wastewater
Sedimentation
Waste Water
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Summary:•Saline wastewater greatly improved microalgae sedimentation in PBR.•The mechanism of microalgae sedimentation changed with the influent salinity.•Microalgae achieved the highest lipid productivity at salinity of 1.0%.•Saturation of microalgae fatty acids increased with the increase of salinity. Saline wastewater was used in this study to culture freshwater microalgae Chlorella pyrenoidosa in sequencing batch photobioreactor to improve the sedimentation and lipid production of algal cells. Influent salinity of 0.5% or above effectively promoted the sedimentation of microalgae in the settling stage of photobioreactor, and greatly reduced the algal biomass in effluent. The mechanism of the saline wastewater in improving the sedimentation of microalgae included decreasing zeta potential, increasing cell particle size and promoting extracellular polymeric substances synthesis, which varied with influent salinity. Saline wastewater also promoted the lipid accumulation in microalgae. Lipid content of microalgae increased with increasing influent salinity. However, the growth of microalgae was greatly inhibited at the influent salinity of 2.0% and 3.0%. Therefore, the PBR with influent salinity of 1.0% achieved the highest productivity of microalgae lipid. The saturation of fatty acids of microalgae gradually increased with increasing influent salinity.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2021.126392