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Enhancement of biodiesel-promising microalgae Chlorella pyrenoidosa growth using stimulants in municipal sewage
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2021-01-06 , DOI: 10.1007/s13399-020-01204-z
Qing Wang , Wenbiao Jin , Xu Zhou , Cong Zhang , Shuhong Gao , Yidi Chen

Cultivation of high-lipid microalgae using municipal sewage can both treat polluted water and gain biodiesel. Rapid cultivation of microalgae is crucial for the entire process. In this study, four stimulants (phytohormone 2,4-d; Fe3+; photosynthetic bacteria—Rhodopseudomonas palustris; CO2) were firstly chosen to investigate their effects on microalgae Chlorella pyrenoidosa cultivation in municipal sewage. Meanwhile, orthogonal experiments were designed to compare the enhancing effects on the growth of microalgae C. pyrenoidosa and lipid accumulation by different combinations of stimulants, which were also conducted for outdoor culture. The optimum stimulant combination was 1.0 mg/L 2,4-d; 10−7 mol/L Fe3+; 4.5 mL (109 cells/mL) photosynthetic bacteria; and 8% CO2. Among the four kinds of stimulants, phytohormone 2,4-d and photosynthetic bacteria played more important roles on the microalgae growth and lipid accumulation. The optimum combination of stimulants could also promote the microalgae biomass and lipid yield during outdoor cultivation. The maximum OD681 of microalgae was 37.9% higher than that of the control group without addition of stimulants. The obtained microalgae dry weight and lipid production were 0.3 and 0.13 g /L, which were 80.0% and 85.7% higher than that of the control group, respectively. The promotion of microalgae photosynthetic rate was the main reason for the stimulant-enhanced microalgae cultivation. This study exerts positive effects on the development of microalgae biodiesel.



中文翻译:

在城市污水中使用刺激物来增强生物柴油前景的微藻小球藻的生长

利用城市污水培养高脂微藻既可以处理污水,又可以获取生物柴油。快速培养微藻对于整个过程至关重要。在这项研究中,首先选择了四种刺激物(植物激素2,4- d; Fe 3+;光合细菌-Rhodopseudomonas palustris; CO 2)来研究它们对城市污水中微藻小球藻培养的影响。同时,设计了正交试验以比较对微藻C.pyrenoidosa生长的增强作用以及通过不同刺激物组合进行的脂质积累,也可以用于室外培养。最佳刺激剂组合为1.0 mg / L 2,4- d ; 10 -7 mol / L Fe 3+ ; 4.5 mL(10 9细胞/ mL)光合细菌;和8%的CO 2。在这四种刺激物中,植物激素2,4- d和光合细菌在微藻生长和脂质积累中起着重要作用。最佳的兴奋剂组合还可以促进室外栽培期间微藻的生物量和脂质产量。最大OD 681不添加刺激剂的微藻含量比对照组高37.9%。所获得的微藻干重和脂质产量分别为0.3和0.13g / L,分别比对照组高80.0%和85.7%。促进微藻培养的主要原因是微藻光合速率的提高。这项研究对微藻生物柴油的发​​展产生积极影响。

更新日期:2021-01-06
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