Influence of spectrally selective solar cells on microalgae growth in photo-bioreactors

Osterthun, Norbert; Helamieh, Mark; Berends, Dennis; Neugebohrn, Nils; Gehrke, Kai; Vehse, Martin; Kerner, Martin; Agert, Carsten

doi:10.1063/5.0054814

Cited by 7 publications

(9 citation statements)

References 20 publications

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“…This finding is also supported by a recent study on the same algae strain. It was shown that wavelengths below 500 nm combined with red light (600–700 nm) lead to higher photosynthetic efficiency and growth in A. obliquus , compared to monochromatic red light (600–700 nm) (Osterthun, Helamieh, et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…These brackets kept the tubes vertically and prevented ambient light from reaching the back and the sides of the tubes. All tubes were exclusively irradiated from the front side of the water bath with metal halide lamps (Philips MSR HR CT, 575 W), with a sun‐like light spectrum (Figure 1a) (Helamieh et al, 2021; Osterthun, Helamieh, et al, 2021). The metal halide lamps generated the applied white light spectrum (380–700 nm).…”

Section: Methodsmentioning

confidence: 99%

“…All cultivation experiments were started by using a volume of 350 ml of microalgae suspension. The growth was monitored via the OD 750 , which was measured directly after sampling (Admirasari et al, 2022; Helamieh et al, 2021; Osterthun, Helamieh, et al, 2021; Reymann et al, 2020). The CDW was determined via the linear correlation between OD 750 and CDW as established by the measurements.

CDW goodbreak= 0.873 goodbreak\times {OD}_{750} goodbreak- 0.156

All experiments were performed as batch experiments for 96 h, with triplicates for each test condition in two experiments.…”

Section: Methodsmentioning

confidence: 99%

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Blue‐green light is required for a maximized fatty acid unsaturation and pigment concentration in the microalga Acutodesmus obliquus

Helamieh

Reich

Bory

et al. 2022

Lipids

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Blue‐green light is known to maximize the degree of fatty acid (FA) unsaturation in microalgae. However, knowledge on the particular waveband responsible for this stimulation of FA desaturation and its impact on the pigment composition in microalgae remains limited. In this study, Acutodesmus obliquus was cultivated for 96 h at 15°C with different light spectra (380–700 nm, 470–700 nm, 520–700 nm, 600–700 nm, and dark controls). Growth was monitored daily, and qualitative characterization of the microalgal FA composition was achieved via gas chromatography coupled with electron impact ionization mass spectrometry (GC‐EI/MS). Additionally, a quantitative analysis of microalgal pigments was performed using high‐performance liquid chromatography with diode array detection (HPLC‐DAD). Spectra that included wavelengths between 470 and 520 nm led to a significantly higher percentage of the polyunsaturated fatty acids (PUFA) 18:3 and 16:4, compared to all other light conditions. However, no significant differences between the red light cultivations and the heterotrophic dark controls were observed for the FA 18:3 and 16:4. These results indicate, that exclusively the blue‐green light waveband between 470 and 520 nm is responsible for a maximized FA unsaturation in A. obliquus. Furthermore, the growth and production of pigments were impaired if blue‐green light (380–520 nm) was absent in the light spectrum. This knowledge can contribute to achieving a suitable microalgal pigment and FA composition for industrial purposes and must be considered in spectrally selective microalgae cultivation systems.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

CDW goodbreak= 0.873 goodbreak\times {OD}_{750} goodbreak- 0.156

All experiments were performed as batch experiments for 96 h, with triplicates for each test condition in two experiments.…”

Section: Methodsmentioning

confidence: 99%

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Blue‐green light is required for a maximized fatty acid unsaturation and pigment concentration in the microalga Acutodesmus obliquus

Helamieh

Reich

Bory

et al. 2022

Lipids

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“…The assessment of this technology in a lab scale photo‐bioreactor has proven significant algae growth. [ 469 ] Thompson et al. proposed tinted semitransparent panels based on sufficiently thin a‐Si:H absorbers for synergetic crop and electricity production (Figure 13d).…”

Section: Versatile Applications Of Tunable Pv Technologies Challenges...mentioning

confidence: 99%

“…Spectrally selective ultrathin a‐Ge ST‐PV using multilayer photonic structures was validated in a lab scale photo‐bioreactor. [ 468,469 ] Tinted semitransparent a‐Si panels was demonstrated on small‐scale demonstrator greenhouses. [ 470 ] A system of spectrally‐selective solar‐powered greenhouse using dye‐based luminescent concentrator has proven itself in operational environment.…”

Section: Conclusion and Outlooksmentioning

confidence: 99%

Tunable Photovoltaics: Adapting Solar Cell Technologies to Versatile Applications

Meddeb

Götz‐Köhler

Neugebohrn

et al. 2022

Advanced Energy Materials

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solar, wind, hydro, geothermal, and biomass, to enable a steady mitigation of greenhouse gas emissions, which are causing the planetary climate change and global warming. [5][6][7] Additionally, due to the economic development and the worldwide urbanization, a continuous rise of the global energy consumption across all key sectors, that is, power, heating, industry, and transport is occurring. This is expressed by an increase in the annual global electricity demand by 4.5% in 2021 corresponding to additional 1000 TWh. [4] Hence, strict criteria for the selection of competitive and abundant energy alternatives are imposed, requiring high yield at affordable prices. [8] The share of total renewables power generation excluding hydropower exceeded 3000 TWh in 2020, corresponding to almost 12% of the global electricity generation. [3] Considering an effective synergy between various sustainable energy candidates, solar photovoltaics (PV) have demonstrated great capabilities that can satisfy the requirements in the pathway towards 100% renewable electricity. [9][10][11][12] Owing to the research and development activities over the last decades, the power conversion efficiencies of solar cells (SC) have skyrocketed with a prolonged operation lifetime (>15 years) and a drastic plummeting in manufacturing costs (global average module selling price below $0.25 per W). [6,[13][14][15] The rapid universal deployment of PV resulted in a contribution of about 3.4% in the worldwide electricity generation in 2020. [3] Presently, the global installed PV capacity is approaching 1 TW and it is envisioned to reach ≈10 TW by 2030 and 30 to 70 TW by 2050. [16] Interestingly, along with massive electricity production using conventional solar power plants and rooftop solar panels, ancillary concepts of PV offer new strategies for supplying modern systems in versatile applications. [17][18][19] Moreover, diverse functionalities beyond solar energy harvesting can be afforded by adaptive PV, including aesthetic appearance, visual comfort and thermal management. [17,18,20,21] The distributed nature and the ubiquitous accessibility of multifunctional PV products are substantial features of solar PV in contrast to other renewable energies. However, traditional SCs dominating the market impose intrinsic optoelectronic and thermomechanical limitations, that prohibit their multifunctional utilization. To overcome these drawbacks, novel functional materials and innovative device architecture Solar photovoltaics (PV) offer viable and sustainable solutions to satisfy the growing energy demand and to meet the pressing climate targets. The deployment of conventional PV technologies is one of the major contributors of the ongoing energy transition in electricity power sector. However, the diversity of PV paradigms can open different opportunities for supplying modern systems in a wide range of terrestrial, marine, and aerospace applications. Such ubiquitous and versatile applications necessitate the development of PV technologies with customized desig...

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Scale-up of microalgal systems for decarbonization and bioproducts: Challenges and opportunities

Xu,

Shao,

Qian

et al. 2024

Bioresource Technology

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Influence of spectrally selective solar cells on microalgae growth in photo-bioreactors

Cited by 7 publications

References 20 publications

Blue‐green light is required for a maximized fatty acid unsaturation and pigment concentration in the microalga Acutodesmus obliquus

Blue‐green light is required for a maximized fatty acid unsaturation and pigment concentration in the microalga Acutodesmus obliquus

Tunable Photovoltaics: Adapting Solar Cell Technologies to Versatile Applications

Scale-up of microalgal systems for decarbonization and bioproducts: Challenges and opportunities

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