Selection of microalgae for biodiesel production in a scalable outdoor photobioreactor in north China

Xia, Ling; Song, Shaoxian; He, Qiaoning; Yang, Haijian; Hu, Chunxiang

doi:10.1016/j.biortech.2014.10.008

Cited by 27 publications

(14 citation statements)

References 34 publications

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“…NJ-18 Airlift China Batch 70 91.8 21.9 (Lipid) 172.6 a [ 36 ] Chlorella sp. NJ-18 Airlift China Semi-continuous 70 87.4 24.1 (Lipid) 164.3 a [ 36 ] S. obtusus XJ-15 Plastic bag China Two-stage 70 × 2 86.5 36.4 (Lipid) 170.0 [ 17 ] B. braunii Raceway India Batch 80 100 24 (Hydrocarbon) 188 a [ 37 ] S. obtusus XJ-15 Airlift bag China Batch 140 75.6 31.0 (Lipid) 142.1 a [ 38 ] Graesiella sp. WBG-1 Raceway China Batch 40000 8.7 2.9 (Lipid) 16.4 a [ 18 ] N. gaditana Lubián CCMP 527 Raceway …”

Section: Resultsmentioning

confidence: 99%

Feasibility of CO2 mitigation and carbohydrate production by microalga Scenedesmus obliquus CNW-N used for bioethanol fermentation under outdoor conditions: effects of seasonal changes

Chen

Chang

et al. 2017

Biotechnol Biofuels

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BackgroundAlthough outdoor cultivation systems have been widely used for mass production of microalgae at a relatively low cost, there are still limited efforts on outdoor cultivation of carbohydrate-rich microalgae that were further used as feedstock for fermentative bioethanol production. In particular, the effects of seasonal changes on cell growth, CO2 fixation, and carbohydrate production of the microalgae have not been well investigated.ResultsThis work demonstrates the feasibility of using outdoor tubular photobioreactors (PBR) for whole-year-round cultivation of a carbohydrate-rich microalga Scenedesmus obliquus CNW-N in southern Taiwan. Time-course profile of the carbohydrate content under nitrogen-deficient conditions was monitored to assess the seasonal changes. The optimal CO2 fixation rate and carbohydrate productivity were 430.2 mg L−1 d−1and 111.8 mg L−1d−1, respectively, which were obtained during the summer time. Under nitrogen starvation, the microalgal biomass can accumulate nearly 45–50% of carbohydrates, mainly composed of glucose that accounted for 70–80% of the total carbohydrates in the microalgal cells. This glucose-rich microalgal biomass is apparently a very suitable carbon source for bioethanol fermentation.ConclusionThis work shows the feasibility of combining CO2 fixation and bioethanol production using microalgae grown in outdoor photobioreactors as feedstock. The understanding of the seasonal changes in the carbohydrate productivity makes this approach more practically viable. The novel strategy proposed in this study could be a promising alternative to the existing technology dealing with CO2 mitigation and biofuels production.

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Section: Resultsmentioning

confidence: 99%

Feasibility of CO2 mitigation and carbohydrate production by microalga Scenedesmus obliquus CNW-N used for bioethanol fermentation under outdoor conditions: effects of seasonal changes

Chen

Chang

et al. 2017

Biotechnol Biofuels

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“…The injector and detector temperatures were maintained at 270 and 280°C, respectively, with an oven temperature gradient of 50–170°C at 40°C min −1 after a 1 min hold time at 50°C, then with an oven temperature gradient of 170–210°C at 18°C min −1 after a 1 min hold. All parameters of the FAME were derived from the calibration curves generated from the FAME standard mix (Supelco 37 component FAME mix, Sigma-Aldrich, USA) [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

Effective harvesting of microalgae by coagulation–flotation

Xia

Huang

et al. 2017

R. Soc. open sci.

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This study developed a coagulation–flotation process for microalgae Chlorella sp. XJ-445 harvesting, which was composed of algal surface modification by combined use of Al3+ and cetyltrimethylammonium bromide (CTAB) and followed dispersed bubble flotation. Dissolved organic matter (DOM) in the medium was firstly characterized and mainly consisted of hydrophilic low molecular weight molecules. The dosage of collector (CTAB) and coagulant (Al3+) were optimized, and with the pretreatment of 40 mg Al3+ and 60 mg CTAB per 1 g dry biomass without pH adjustment, a maximum flotation recovery efficiency of 98.73% can be achieved with the presence of DOM. Algal cells characterization results showed that the combined use of CTAB and Al3+ largely enhanced the algal floc size, and exhibited higher degree of hydrophobicity, which favoured the flotation, and can be interpreted by DLVO (Derjaguin, Landau, Verwey and Overbeek) modelling. A benefit in fatty acid conversion was further found with the optimized coagulation–flotation process. It was suggested that this coagulation based flotation is a promising strategy for high-efficiency harvesting of microalgae.

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“…Organism and culture The freshwater green alga Scenedesmus obtusus XJ-15 used in this study was provided by Prof. Xudong Xu of the Institute of Hydrobiology in China (Xia et al 2013(Xia et al , 2014a washed cells into 500-mL Erlenmeyer flasks filled with 300 mL of BG-11 medium with or without 0.9 g L −1 sodium nitrate and cultured under 17, 25, and 33°C, and 100 μmol photons m −2 s −1 in temperature-controlled incubators with continuous aeration.…”

Section: Methodsmentioning

confidence: 99%

High temperature enhances lipid accumulation in nitrogen-deprived Scenedesmus obtusus XJ-15

Xia

Song

2015

J Appl Phycol

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This study investigated the changes in lipid and starch contents, lipid fraction, and lipid profile in the nitrogen-starved Scenedesmus obtusus XJ-15 at different temperatures (17, 25, and 33°C). The optimal temperature for both growth and lipid accumulation under nitrogen-sufficient condition was found to be 25°C. However, under nitrogen deprivation, the total and neutral lipids increased with increasing temperature, and achieved the highest lipid content of 47.60 % of dry cell weight and the highest TAG content of 79.66 % of total lipid at 33°C. In the meantime, the stored cellular starch content decreased with the increasing temperature. Thus, high temperature induced carbon flux from starch toward TAG accumulation in microalgae during nitrogen starvation. In addition, the decreased polar lipids may also serve for TAG synthesis under high temperature, and high temperature further reduced the degree of the fatty acid unsaturation and favored a better biodiesel production. These results suggested that high-temperature stress can be a good strategy for enhancing biofuel production in oleaginous microalgae during nitrogen deficiency.

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Selection of microalgae for biodiesel production in a scalable outdoor photobioreactor in north China

Cited by 27 publications

References 34 publications

Feasibility of CO2 mitigation and carbohydrate production by microalga Scenedesmus obliquus CNW-N used for bioethanol fermentation under outdoor conditions: effects of seasonal changes

Feasibility of CO2 mitigation and carbohydrate production by microalga Scenedesmus obliquus CNW-N used for bioethanol fermentation under outdoor conditions: effects of seasonal changes

Effective harvesting of microalgae by coagulation–flotation

High temperature enhances lipid accumulation in nitrogen-deprived Scenedesmus obtusus XJ-15

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