Enhanced lipid production by Chlorella pyrenoidosa through magnetic field pretreatment of wastewater and treatment of microalgae-wastewater culture solution: Magnetic field treatment modes and conditions

Xiaochi Feng; Yangguang Chen; Junhong Lv; Songfang Han; Renjie Tu; Xu Zhou; Wenbiao Jin; Nanqi Ren

doi:10.1016/j.biortech.2020.123102

Enhanced lipid production by Chlorella pyrenoidosa through magnetic field pretreatment of wastewater and treatment of microalgae-wastewater culture solution: Magnetic field treatment modes and conditions

Bioresour Technol. 2020 Jun:306:123102. doi: 10.1016/j.biortech.2020.123102. Epub 2020 Mar 2.

Authors

Xiaochi Feng¹, Yangguang Chen², Junhong Lv³, Songfang Han¹, Renjie Tu¹, Xu Zhou¹, Wenbiao Jin⁴, Nanqi Ren⁵

Affiliations

¹ Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China; School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China.
² School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China; Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou, Guangdong 510010, PR China.
³ School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China.
⁴ Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China; School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China. Electronic address: jinwb@hit.edu.cn.
⁵ School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.

PMID: 32179399
DOI: 10.1016/j.biortech.2020.123102

Abstract

The cultivation of microalgae in municipal wastewater not only purifies the wastewater but also transforms nutrients into biomass that contains high-value lipids. In this study, conventional static bottom-magnetic field (bottom-MF) equipment and cost-effective bypass-magnetic field (bypass-MF) equipment were designed and independently coupled with a microalgae-wastewater system in different positions to evaluate the effect of magnetic field (MF) on microalgae biomass production and lipid accumulation. When the MF equipment was applied in the wastewater pretreatment unit, the bottom-MF pretreatment mode exhibited a more beneficial effect on subsequent biomass and lipid accumulation. However, when the MF equipment was applied in the microalgae-wastewater culture unit, there was no significant difference between the bottom-MF and bypass-MF modes. The results of the orthogonal experiment suggested the optimum conditions for lipid production were wastewater pretreatment by bottom-MF at 5000 Gs for 1 h, followed by microalgae-wastewater culture treatment by bypass-MF at 5000 Gs for 3 h.

Keywords: Biomass accumulation; Chlorella pyrenoidosa; Lipid production; Magnetic field; Microalgae.