A stochastic Lagrangian approach for simulating the effect of turbulent mixing on algae growth rate in a photobioreactor

Marshall, Jeffrey S.; Sala, Kyle

doi:10.1016/j.ces.2010.10.043

Cited by 29 publications

(12 citation statements)

References 53 publications

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“…Models differed for numerical approaches and theories. They include: Eulerian-based partial differential equations, 13,[38][39][40] light dynamic imposition, [41][42][43] direct numeric simulation, 44 flow field imposition, 44 stochastic Lagrangian, [45][46][47][48] and energetic analysis. 49 Luo et al [50][51][52][53] proposed a model integrating kinetics, light distribution, and microalgal particle trajectories observed in an externally irradiated airlift photobioreactor by means of computer automated radioactive particle tracking (CARPT).…”

Section: Introductionmentioning

confidence: 99%

Photobioreactors for microalgal cultures: A Lagrangian model coupling hydrodynamics and kinetics

Olivieri

Gargiulo

Lettieri

et al. 2015

Biotechnol Progress

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Closed photobioreactors have to be optimized in terms of light utilization and overall photosynthesis rate. A simple model coupling the hydrodynamics and the photosynthesis kinetics has been proposed to analyze the photosynthesis dynamics due to the continuous shuttle of microalgae between dark and lighted zones of the photobioreactor. Microalgal motion has been described according to a stochastic Lagrangian approach adopting the turbulence model suitable for the photobioreactor configuration (single vs. two-phase flows). Effects of light path, biomass concentration, turbulence level and irradiance have been reported in terms of overall photosynthesis rate. Different irradiation strategies (internal, lateral and rounding) and several photobioreactor configurations (flat, tubular, bubble column, airlift) have been investigated. Photobioreactor configurations and the operating conditions to maximize the photosynthesis rate have been pointed out. Results confirmed and explained the common experimental observation that high concentrated cultures are not photoinhibited at high irradiance level.

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Section: Introductionmentioning

confidence: 99%

Photobioreactors for microalgal cultures: A Lagrangian model coupling hydrodynamics and kinetics

Olivieri

Gargiulo

Lettieri

et al. 2015

Biotechnol Progress

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“…Az aggregátumok kialakulása azért előnytelen, mert a leárnyékolt sejtek nem jutnak hozzá sem elég fényhez, sem elég tápanyaghoz, és befertőződés forrásaivá válhatnak. [3] Túlságosan erős kevertetés a fellépő nagy nyíróerők miatt az algasejtek károsodását, pneumatikus keverés esetében pedig a sejtek kiflotálódását okozhatja. Bár ez utóbbi hatásokat a szuszpenzió és a tápoldat jellemzői alapvetően befolyásolják.…”

Section: A Keverés Szerepe a Mikroalgatermesztésbenunclassified

A szuszpenzió keverésének hatása foto-bioreaktorban termesztett mikroalgák biomassza termelékenységére

Bocsi¹,

Pethő²,

Horváth³

et al. 2015

MTK

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Carbon dioxide is the primary greenhouse gas emitted through human activities. There are natural bioprocesses where this molecule is converted into biomass. With ctivation of microalgae we can feed back the carbon content of CO 2 into biological systems and we can get numbers of valuable organic compounds, among others biofuel, to reach ecological and economical benefits. We ave carried out our measurements in our lab-scale screening photobioreactor system for the characterization of the effect of mixing on biomass productivity to find the most energy effective biomass production mode. ÖsszefoglalásA természetben működnek olyan spontán folyamatok, amelyeket alapul véve a kibocsátásra váró CO 2 széntartalmát biológiai rendszerbe visszavezethetjük, ezáltal számos értékes termék nyerhető, akár üzemanyag biokomponensek is. Ez egy algatechnológiai rendszer üzemeltetése során megvalósítható, melyben tekintettel kell lennünk arra, hogy az egyes lépésekben a lehető legkevesebb energiát használjunk fel. Kísérleteink során arra törekedtünk, hogy egy olyan gázellátási programot hozzunk létre, laboratóriumi környezetben, amelyben a biomassza növekményre a lehető legkisebb energia jut.

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“…The coupling of photosynthesis kinetics, hydrodynamics, and light attenuation was first investigated some 40 years ago (Sheth et al, 1977), and many detailed models have been proposed since then for photobioreactors, using either an Eulerian or a Lagrangian description; see, e.g., Pruvost et al (2008); Marshall and Sala (2011);Olivieri et al (2015). Coupled models of outdoor raceway ponds were also developed during the early 1990s in the scope of the Aquatic Species Program (Sukenik et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Multi-Physics Modeling of Light-Limited Microalgae Growth in Raceway Ponds

et al. 2016

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This paper presents a multi-physics modeling methodology for the quantitative prediction of microalgae productivity in raceway ponds by combining a semi-mechanistic model of microalgae growth describing photoregulation, photoinhibition and photoacclimation, with models of imperfect mixing based on Lagrangian particle-tracking and heterogeneous light distribution. The photosynthetic processes of photoproduction, photoregulation and photoinhibition are represented by a model of chlorophyll fluorescence developed by Nikolaou et al. (2015), which is extended to encompass photoacclimation. The flow is simulated with the commercial CFD package ANSYS, whereas light attenuation is described by the BeerLambert law as a first approximation. Full-scale simulation results are presented on extended time horizons. Comparisons are made in terms of areal productivities under both imperfect and idealized (CSTR) mixing conditions, and for various extraction rates and water depths.

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A stochastic Lagrangian approach for simulating the effect of turbulent mixing on algae growth rate in a photobioreactor

Cited by 29 publications

References 53 publications

Photobioreactors for microalgal cultures: A Lagrangian model coupling hydrodynamics and kinetics

Photobioreactors for microalgal cultures: A Lagrangian model coupling hydrodynamics and kinetics

A szuszpenzió keverésének hatása foto-bioreaktorban termesztett mikroalgák biomassza termelékenységére

Multi-Physics Modeling of Light-Limited Microalgae Growth in Raceway Ponds

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