Improvement of microalgae biomass productivity and subsequent biogas yield of hydrothermal gasification via optimization of illumination

Fózer, Dániel; Kiss, Bernadett; Lőrincz, László; Székely, Edit; Mizsey, Péter; Németh, Áron

doi:10.1016/j.renene.2018.12.122

Cited by 46 publications

(13 citation statements)

References 37 publications

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“…As In this first part, we demonstrated that semi-transparent a-Si:H PV cells set in front of PBR did not affect the Phaeodactylum tricornutum growth rate even if it wholly filtered a large amount of light necessary for its growth (400-550 nm). This result has been observed in other studies [16,17]. Nevertheless, photovoltaic devices had to be improved in order to enhance their semi-transparency and efficiency.…”

Section: Evaluation Of the Pv/pbr Coupled Systemsupporting

confidence: 80%

Optical optimization of semi-transparent a-Si:H solar cells for photobioreactor application

et al. 2019

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To improve the overall photoconversion efficiency and provide energy support for microalgae culture, we propose to develop a photobioreactor (PBR) and 2 photovoltaic technology (PV) coupled system using a-Si:H solar cells directly placed on the PBR's illuminated surface. PV cells have to absorb a part of the incident light to produce electricity while being transparent in the photosynthesis wavelength range. Growing test of Phaeodactylum Tricornutum shows that PV optical filtering does not influence the growth rate. Optical modifications of solar cells layers thicknesses and reactive ion etching of the glass substrate applied to very thin solar cells allowed to maintain a high PV efficiency while maintaining the growth rate of microalgae. The antireflection texture, combined with a light scattering effect applied on the upper side of the substrate gives the best results. Short circuit current of thin solar cells goes from 7.3 to 10.2 mA/cm 2 , and the efficiency increased from 3.5 to 4.7 %.

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Section: Evaluation Of the Pv/pbr Coupled Systemsupporting

confidence: 80%

Optical optimization of semi-transparent a-Si:H solar cells for photobioreactor application

et al. 2019

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“…BA-165 (0.35 ± 0.01) day −1 ( Klin et al, 2020 ). Biomass productivity obtained was found greater than biomass productivity of Chlorella vulgaris (75.57 ± 1.93 mg L −1 day −1 ) ( Fozer et al, 2019 ), Parachlorella kesslari (88 mg L −1 day −1 ) ( Fields et al, 2021 ), Chlorella sorokiniana (146.07 mg L −1 day −1 ) ( Guldhe et al, 2019 ) outlined in earlier studies. Our findings are consistent with literature reported earlier that high phosphate concentration resulted in high growth rate and biomass yield, where the optimum phosphate concentration of microalgae ranges in 0.001 g L −1 to 0.179 g L −1 ( Roopnarain et al, 2014 ).…”

Section: Discussionmentioning

confidence: 68%

“…Being rich in cellulosic content, Algal biomass offers advantage over other biofuel feedstock’s as, biochemically algal cells lacks hemicellulose and lignin, which simplifies the process of bioethanol production ( Özçimen & İnan, 2015 ). The dominant algal genera; Chlorella, Chlamydomonas, Scenedesmus, Chlorococcum are reported for enhanced biomass and carbohydrates content ( Fozer et al, 2019 , Metsoviti et al, 2019 , Özçimen and İnan, 2015 ). Biochemical composition of microalgae could be altered and improved by changing abiotic growth conditions such as; salinity, temperature, light intensity, pH, and nutrient concentration ( Almutairi et al, 2021 , Kurano and Miyachi, 2005 , Zhang et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Deciphering role of technical bioprocess parameters for bioethanol production using microalgae

Bibi

Yasmin

Jamal

et al. 2021

Saudi Journal of Biological Sciences

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Microalgae biomass is considered an important feedstock for biofuels and other bioactive compounds due to its faster growth rate, high biomass production and high biomolecules accumulation over first and second-generation feedstock. This research aimed to maximize the specific growth rate of fresh water green microalgae Closteriopsis acicularis, a member of family Chlorellaceae under the effect of pH and phosphate concentration to attain enhanced biomass productivity. This study investigates the individual and cumulative effect of phosphate concentration and pH on specific growth characteristics of Closteriopsis acicularis in autotrophic mode of cultivation for bioethanol production. Central-Composite Design (CCD) strategy and Response Surface Methodology (RSM) was used for the optimization of microalga growth and ethanol production under laboratory conditions. The results showed that high specific growth rate and biomass productivity of 0.342 day −1 and 0.497 g L −1 day −1 respectively, were achieved at high concentration of phosphate (0.115 g L −1 ) and pH (9) at 21st day of cultivation. The elemental composition of optimized biomass has shown enhanced elemental accumulation of certain macro (C, O, P) and micronutrients (Na, Mg, Al, K, Ca and Fe) except for nitrogen and sulfur. The Fourier transform infrared spectroscopic analysis has revealed spectral peaks and high absorbance in spectral range of carbohydrates, lipids and proteins, in optimized biomass. The carbohydrates content of optimized biomass was observed as 58%, with 29.3 g L −1 of fermentable sugars after acid catalyzed saccharification. The bioethanol yield was estimated as 51 % g ethanol/g glucose with maximum of 14.9 g/L of bioethanol production. In conclusion, it can be inferred that high specific growth rate and biomass productivity can be achieved by varying levels of phosphate concentration and pH during cultivation of Closteriopsis acicularis for improved yield of microbial growth, biomass and bioethanol production.

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“…One of the important strategies that received positive environmental and social outcomes in fighting climate change by reducing greenhouse gas emissions is to use microalgal biomass as biofuel feedstock [1]. These outcomes are mainly due to microalgae's ability to grow biomass significantly faster (10-50 times) than terrestrial plants [2].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the CO 2 removal efficiency (or CO 2 fixation capacity) of microalgae is known to be higher than terrestrial plants owing to their faster growth rate [3]. Microalgal biomass has been estimated as a future resource for the generation of bioenergy and biofuels (e.g., bioethanol, biogas, biodiesel), high value-added products (e.g., proteins, pigments, omega-3), food, and fertilizer [1,2,4]. Bioconversion of microalgal biomass into biofuels has attracted a considerable amount of attention from both industry and academia as a viable solution for replacing fossil fuels with alternative energy sources Highlights • Hydrodynamic cavitation (HC) is efficient pretreatment method for cell disruption.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrodynamic Cavitation-Assisted NaOH Pretreatment on Biofuel Production from Cyanobacteria: Promising Approach

et al. 2021

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Eukaryotic microalgae and prokaryotic cyanobacteria can grow in various water and wastewater types, and both can grow biomass by taking nutrients and converting atmospheric CO 2 into useful products. Biofuels obtained by processing this landless grown biomass are defined as "third-generation biofuels". In this study, the effects of hydrodynamic cavitation (HC)-assisted NaOH pretreatment on methane production from cyanobacteria were investigated. Cyanobacterial biomass was isolated from thermal springs located in the southwest of Turkey (Denizli-Turkey) and identified as Desertifilum tharense. Desertifilum tharense biomass was grown on a laboratory scale, and along with its compositional characteristics, culturespecific parameters were determined. HC-assisted NaOH pretreatment was applied to evaluate optimum process conditions for enhancing methane production from D. tharense. In the experimental design, process parameters of cavitation number (Cv: 0.3-0.7), NaOH concentration (0-4%), solid content (1.5%), reaction time (4h), and reaction temperature (30°C) were combined to reveal the parameter-specific impact of HC pretreatment. The effect of the HC-assisted NaOH pretreatment was further investigated with molecular-bond and surface structure characterization. Along with the energy equivalent of obtained biofuel, energy requirements for cultivation, harvesting, pretreatment, and anaerobic digestion (AD) were calculated to determine the process's overall energy efficiency. Kinetic parameters of raw and pretreated D. tharense were determined by first-order, cone, modified Gompertz, and reaction curve models. The results revealed that by the application of pretreatment, a 2-35.3% soluble COD increase was achieved, whereas methane production was increased from 241.5 to 290.6 mLCH 4 gVS −1 . Application of HC with a low Cv of 0.3 boosted methane production up to 20.3% compared to the raw D. tharense.

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Improvement of microalgae biomass productivity and subsequent biogas yield of hydrothermal gasification via optimization of illumination

Cited by 46 publications

References 37 publications

Optical optimization of semi-transparent a-Si:H solar cells for photobioreactor application

Optical optimization of semi-transparent a-Si:H solar cells for photobioreactor application

Deciphering role of technical bioprocess parameters for bioethanol production using microalgae

Effects of Hydrodynamic Cavitation-Assisted NaOH Pretreatment on Biofuel Production from Cyanobacteria: Promising Approach

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