Modeling and Optimization of Microalgae Growth in Photobioreactors: A Multidisciplinary Problem

Papáček, Štěpán; Jablonský, Jiří; Petera, Karel; Rehák, Branislav; Matonoha, Ctirad

doi:10.1007/978-3-319-10759-2_29

Cited by 6 publications

(8 citation statements)

References 13 publications

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“…In contrast, microalgae cells are mostly modeled as discrete objects [23,24,[26][27][28][29]31,34,[36][37][38]136]. Another interesting approach to investigate the kinetics of photosynthesis with regard to mixing-induced light regimes is to employ an Eulerian three-species model for particulate cells [30,139], which reflects the different metabolic states of the microalgae cells according to a photosynthetic factory model [140][141][142], see also Section 4.1.1.…”

Section: Multiphase Flowmentioning

confidence: 99%

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Luzi¹,

McHardy

2022

Energies

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Computational Fluid Dynamics (CFD) have been frequently applied to model the growth conditions in photobioreactors, which are affected in a complex way by multiple, interacting physical processes. We review common photobioreactor types and discuss the processes occurring therein as well as how these processes have been considered in previous CFD models. The analysis reveals that CFD models of photobioreactors do often not consider state-of-the-art modeling approaches. As a comprehensive photobioreactor model consists of several sub-models, we review the most relevant models for the simulation of fluid flows, light propagation, heat and mass transfer and growth kinetics as well as state-of-the-art models for turbulence and interphase forces, revealing their strength and deficiencies. In addition, we review the population balance equation, breakage and coalescence models and discretization methods since the predicted bubble size distribution critically depends on them. This comprehensive overview of the available models provides a unique toolbox for generating CFD models of photobioreactors. Directions future research should take are also discussed, mainly consisting of an extensive experimental validation of the single models for specific photobioreactor geometries, as well as more complete and sophisticated integrated models by virtue of the constant increase of the computational capacity.

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Section: Multiphase Flowmentioning

confidence: 99%

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Luzi¹,

McHardy

2022

Energies

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“…Several authors proposed different models that couple photosynthesis kinetics, light intensity field, and photobioreactor hydrodynamics. Models differ for numerical and theoretical approaches and include circulation-time approach (where the flow patterns and thus the cell trajectories are presumed a priori) [29,45], Lagrangian approach [30], and Eulerian approach [46]. The latter two involve the use of CFD whereas in the first case it is not necessary.…”

Section: Cell Trajectoriesmentioning

confidence: 99%

Model-Based Prediction of Perceived Light Flashing in Recirculated Inclined Wavy-Bottomed Photobioreactors

et al. 2021

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Microalgae biomass production rate in short light-path photobioreactors potentially can be improved by mixing-induced flashing light regimes. A cascade photobioreactor features a thin liquid layer flowing down a sloping, wavy-bottomed surface where liquid flow exhibits peculiar local recirculation hydrodynamics, potentially conducive to an ordered flashing light regime. This article presents a model-based analysis of the frequency distribution of perceived irradiance in said wavy-bottomed photobioreactor. The model combines a Lagrangian description of the motion of individual cells, in turn derived from the hydrodynamic parameters of the photobioreactor extracted from an experimentally validated Computational Fluid Dynamic model, with a simplified description of the irradiance field across the culture thickness, down to the spectral analysis of perceived irradiance. The main finding of the work is that the wavy bottomed photobioreactor provides a ‘robust’ spectral excitation to the circulating microalgae up to 3 Hz frequency, while in flat panels and bubble columns excitation decays evenly at a 24 db/octave rate. This analysis paves the way to improving the light flashing performance of the wavy-bottomed photobioreactor with respect to geometry (cavity size and installation inclination) and operation (flow rate).

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“…Mathematical models of dynamics of biomass growth in photobioreactors of various designs are developed. The disadvantages of such models are as follows: the use of freshwater is assumed and only the increase in biomass is determined in [25]; the increase in biomass in a cylindrical reactor is determined in [26]; increase in biomass and CO 2 uptake taking into account characteristics of the airlift reactor is determined in [27]; the increase in biomass and CO 2 uptake taking into account changes in lighting is determined in [28]. All these models do not take into account the possibility of using sewage water as a culture medium and do not determine the dynamics of removal of biogenic elements.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the photobioreactor operation efficiency in the technological scheme of wastewater treatment

Shamanskyi

Бойченко

Khrutba

et al. 2021

EEJET

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Conventional process schemes of municipal sewage water treatment, advantages, and disadvantages of the methods applied when removing biogenic elements were considered. It was shown that the existing shortcomings cause additional explicit costs and difficulties when disposing of the resulting waste. Low efficiency of the removal processes themselves causing residual concentrations of biogenic elements in the treated sewage water was also shown. A process scheme for treating municipal sewage water was proposed. It includes the use of a photobioreactor of a proposed design for the removal of biogenic elements due to the metabolism of microalgae. It was experimentally shown that the use of Euglena gracilis strain for removal of phosphates in initial concentrations of 4, 7, and 14 mg/dm3 from sewage water is the most efficient way. It makes it possible to reduce these concentrations to residual 0…0.55 mg/dm3 in four days. A 3.75…5.58 times increment of microalgae biomass during this period was also shown. A mathematical model was constructed for calculating the time of staying the sewage water and microalgae mixture in a photobioreactor to achieve the required degree of removal of biogenic elements. Based on the proposed model and experimental studies, the required time of staying in the rector working area was calculated. It was shown that with the use of Euglena gracilis strain but without removal of biogenic elements at previous purification stages (process schemes including only mechanical purification), the time of mixture staying in the working zone was 37.81 hrs. With partial removal of biogenic elements at the stage of biological treatment (0.55 mg/dm3 total nitrogen, 0.91 mg/dm3 ammonium nitrogen, 0.44 mg/dm3 phosphates), this time was reduced to 26.66 hrs. It was found that the use of Euglena gracilis strain instead of Chlorella vulgaris (FC-16) in the removal of phosphates results in a 2-time increase in the process efficiency and a 50 % decrease in time of mixture staying in the working zone. Recommendations for calculating geometric parameters of photobioreactors of the proposed design were given for use in the process schemes

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Modeling and Optimization of Microalgae Growth in Photobioreactors: A Multidisciplinary Problem

Cited by 6 publications

References 13 publications

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Model-Based Prediction of Perceived Light Flashing in Recirculated Inclined Wavy-Bottomed Photobioreactors

Improving the photobioreactor operation efficiency in the technological scheme of wastewater treatment

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