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

2021; Elsevier BV; Volume: 347; Linguagem: Inglês

10.1016/j.biortech.2021.126392

1873-2976

Zi-Yan Yang, Feng Gao, Junzhi Liu, Jinsheng Yang, Mei Liu, Yaming Ge, Dongzhi Chen, Jianmeng Chen,

Biodiesel Production and Applications

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.