Microalgae cultivation in photobioreactors: An overview of light characteristics

Wang, Shi-Kai; Stiles, Amanda R.; Chen, Guo; Liu, Chun-Zhao

doi:10.1002/elsc.201300170

Cited by 132 publications

(53 citation statements)

References 93 publications

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“…Particularly with increasing use of light-emitting diodes (LEDs), the question of spectral dependency of light penetration is becoming more important for both lab scale studies and commercial applications (Schulze et al, 2014). The effects of light quality on growth and morphology have been reviewed (Wang et al, 2014), generally showing that red light is more effective for growth, due to improved absorption by light harvesting pigments such as chlorophyll (Baer et al, 2016;de Mooij et al, 2016;Markou, 2014;Mattos et al, 2015;Ra et al, 2016;Schulze et al, 2014;Wang et al, 2007). For example, Chlamydomonas reinhardtii grown under moderate light intensity (100 mmol photons /m 2 Á s) and low culture density showed peak productivity when primarily red light was used, compared to green and blue (Baer et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Light dilution via wavelength management for efficient high‐density photobioreactors

Ooms

Graham

Nguyen

et al. 2017

Biotech & Bioengineering

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The spectral distribution of light influences microalgae productivity; however, development of photobioreactors has proceeded largely without regard to spectral optimization. Here, we use monochromatic light to quantify the joint influence of path length, culture density, light intensity, and wavelength on productivity and efficiency in Synechococcus elongatus. The productivity of green light was ∼4× that of red at the highest levels of culture density, depth, and light intensity. This performance is attributed to the combination of increased dilution and penetration of this weakly absorbed wavelength over a larger volume fraction of the reactor. In contrast, red light outperformed other wavelengths in low-density cultures with low light intensities. Low-density cultures also adapted more rapidly to reduce absorption of longer wavelengths, allowing for prolonged cultivation. Taken together, these results indicate that, particularly for artificially lit photobioreactors, wavelength needs to be included as a critical operational parameter to maintain optimal performance. Biotechnol. Bioeng. 2017;114: 1160-1169. © 2017 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 99%

Light dilution via wavelength management for efficient high‐density photobioreactors

Ooms

Graham

Nguyen

et al. 2017

Biotech & Bioengineering

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“…The estimated OPR m a x was 83 mg L − 1 h − 1 or 51.5 μmol O 2 g −1 biomass min −1 ; its performance was comparable with photosynthetic activities of other non-extremophile microalgae strains. For example, the OPR for Chlorella vulgaris was 78 μmol O 2 g −1 biomass min −1 (Yun and Park 2003;Wang et al 2014) and 46 μmol O 2 g −1 biomass min −1 for Scenedesmus almeriensis (Costache et al 2013). …”

Section: Discussionmentioning

confidence: 99%

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

et al. 2015

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A novel lab-scale tubular closed photobioreactor was developed and used for the assessment of the photosynthetic activity of an alkaliphilic microalgae mixed consortium under non-substrate limitation (i.e., bicarbonate excess), controlled irradiance, and mixing conditions. Two prominent haloalkaliphilic strains were identified as members of the consortium: Halospirulina sp. and Picochlorum sp. The photobioreactor (vol=0.5 L) consists of two interconnected U-shaped borosilicate glass tubes (internal diameter 2 cm) reaching a surface/volume ratio of 200 m 2 m −3 . This configuration specifically addressed the issue of the homogeneous light distribution among the microalgae suspended cells cultured by using fixed equidistant cool white light LEDs nearby the surface of the glass tubes. A soft homogeneous pneumatic mixing (i.e., airlift) was implemented in the culture fostering Reynolds numbers around 3000. The photosynthetic activity of the microalgae consortium was evaluated during different short-term kinetic assays by fitting the dynamics of the dissolved oxygen concentration to an oxygenic kinetic model. The photobioreactor operated in a closed loop allowed to control the produced oxygen by the extraction of the cumulated gas in the headspace. The use of this novel photobioreactor allowed the photosynthetic activity of microalgae suspended cells to be assessed, where the dissolved oxygen concentration and irradiance were the main parameters affecting the oxygenic rates under alkaline pH.

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“…Algal biotechnology is attracting increasing interest owing to its versatile applicability for pharmaceuticals, nutrient supplies, and fine chemicals . Currently, the application of this technology is being extended to wastewater treatment and biodiesel production . Various algal strains have been developed for specific applications; the growth rates and metabolic activities of these strains are highly dependent on cultivation factors such as light supply, medium composition, and growth conditions .…”

Section: Introductionmentioning

confidence: 99%

Enhanced growth and total fatty acid production of microalgae under various lighting conditions induced by flashing light

Choi

Kim

Kumaran

et al. 2017

Engineering in Life Sciences

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Microalgae are gaining importance as a source of high‐value bioproducts. However, data regarding optimization of algal productivity via variation of environmental factors are lacking. Here, we evaluated a novel lighting method for the enhancement of biomass and total fatty acid (TFA) productivities during algal cultivation. We cultivated six different algal strains (Chlorella vulgaris KCTC AG10002, Acutodesmus obliquus KGE18, Uronema sp. KGE03, Micractinium reisseri KGE19, Fragilaria sp., and Spirogyra sp.) under various lighting conditions—continuous light (CL), light‐dark cycle (LD), and continuous dark (CD)—with or without additional flashing light. We monitored dry cell weight (DCW) and TFA concentrations during cultivation. For each algal strain, the growth rate showed markedly different responses to the various lighting modes. The growth rates of C. vulgaris KCTC AG10002 (1.34‐fold DCW increase, LD with flash), A. obliquus KGE18 (5.16‐fold DCW increase, LD with flash), Uronema sp. KGE03 (2.77‐fold DCW increase, CL with flash), and M. reisseri KGE19 (1.52‐fold DCW increase, CL with flash) markedly increased in response to flashing light. Additionally, in some algal strains cultivated under the LD mode, the flashing light treatment induced increased TFA concentrations (C. vulgaris, 1.19‐fold increase; A. obliquus, 2.59‐fold increase; and M. reisseri, 3.31‐fold increase). Phytohormone analysis of M. reisseri revealed increases in growth rate and TFA concentrations, associated with phytohormone induction via flashing light (e.g. 2.93‐fold increase in gibberellic acid); hence, flashing light can promote substantial alterations in algal metabolism.

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Microalgae cultivation in photobioreactors: An overview of light characteristics

Cited by 132 publications

References 93 publications

Light dilution via wavelength management for efficient high‐density photobioreactors

Light dilution via wavelength management for efficient high‐density photobioreactors

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

Enhanced growth and total fatty acid production of microalgae under various lighting conditions induced by flashing light

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