Parametric sensitivity analysis for temperature control in outdoor photobioreactors

Pereira, Daniele Araujo; Rodrigues, Vinicius O.; Gómez, Sonia V.; Sales, Emerson Andrade; Jorquera, Orlando

doi:10.1016/j.biortech.2013.07.009

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…In countries with high irradiance, the water temperature in some outdoor cultivation systems may increase due to the solar intensity. For example, the temperature in a photobioreactor can be above 35°C (Pereira et al 2013). This high temperature adversely affects the growth of microalgae not adapted to these conditions, e.g., Bamba et al (2015), and can be lethal for a number of species (Barsanti and Gualtieri 2006).…”

Section: Introductionmentioning

confidence: 99%

Viability of biodiesel production from a thermophilic microalga in conventional and alternative culture media

et al. 2018

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Microalgae biodiesel production depends on several factors to minimize the costs of the production process from both biomass and biodiesel. In some outdoor systems, the temperature can be higher than 35°C, which is lethal for several algae. Prospecting microalga from thermal environments seems to be a good option. Therefore, the objective of this work was to isolate a microalga (Acutodesmus obliquus (Turpin) Hegewald and Hanagata) from thermal water and evaluate its cultivation productivity in Bold Basal Medium (BBM) and in lower cost alternative media. One alternative medium contained only the main growth ingredients (DAF), the other included these same ingredients with the addition of wastewater from the purification of grease-based raw materials (DAF ? OGR). Microalga biodiesel productivity was also compared with the biodiesel yield of soybean, which is one of the main raw materials currently used for biodiesel production. The microalga was shown to provide biomass with similar productivity using the three different culture media in log phase. The microalga exhibited biodiesel productivity from 46 to 61 times higher than soybean; using 5.5-7.2% of the water and 1.6-2.2% of the land required for soybean cultivation to produce the same amount of biodiesel. The DAF ? OGR medium, which costs 29% of the cost of the BBM medium, proved to be an efficient alternative medium compared to other in biomass productivity. Levels of tri-unsaturated and polyunsaturated fatty acids from A. obliquus microalga were slightly higher than those standardized by EN14214, requiring that the biodiesel be mixed with antioxidants.

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Section: Introductionmentioning

confidence: 99%

Viability of biodiesel production from a thermophilic microalga in conventional and alternative culture media

et al. 2018

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“…Recently, several studies reported on the development of temperature models and complementary research involving various types of microalgae cultivation systems. − Those studies differ widely in terms of scope (e.g., type of reactor system) and levels of accuracy. One of the most advanced temperature models for a closed photobioreactor system has been reported by Béchet et al , Their model computes the reactor’s heat balance as a function of various static and dynamic parameters for a bubble column reactor concept, a system mostly used in laboratory-scale experiments.…”

Section: Introductionmentioning

confidence: 99%

“…The reported approach thus neglects shading effects that naturally occur in larger applications. To date, shading effects on reactor temperature have only been taken into account by a single study . However, in the respective publication shading was only examined as a static parameter, neglecting the effects of the sun’s position with respect to the orientation and geometry of the panels.…”

Section: Introductionmentioning

confidence: 99%

Thermal Reactor Model for Large-Scale Algae Cultivation in Vertical Flat Panel Photobioreactors

Endres

Roth

Brück

2016

Environ. Sci. Technol.

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Microalgae can grow significantly faster than terrestrial plants and are a promising feedstock for sustainable value added products encompassing pharmaceuticals, pigments, proteins and most prominently biofuels. As the biomass productivity of microalgae strongly depends on the cultivation temperature, detailed information on the reactor temperature as a function of time and geographical location is essential to evaluate the true potential of microalgae as an industrial feedstock. In the present study, a temperature model for an array of vertical flat plate photobioreactors is presented. It was demonstrated that mutual shading of reactor panels has a decisive effect on the reactor temperature. By optimizing distance and thickness of the panels, the occurrence of extreme temperatures and the amplitude of daily temperature fluctuations in the culture medium can be drastically reduced, while maintaining a high level of irradiation on the panels. The presented model was developed and applied to analyze the suitability of various climate zones for algae production in flat panel photobioreactors. Our results demonstrate that in particular Mediterranean and tropical climates represent favorable locations. Lastly, the thermal energy demand required for the case of active temperature control is determined for several locations.

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“…Providing accurate parameters is indeed crucial since model-based optimality might be sensitive to parameters values as shown in [3]. Moreover, assessing the effect of operational factors via sensitivity analysis can provide useful information for improving configuration design of photobioreactors [4].…”

Section: Introductionmentioning

confidence: 99%

Getting the most out of it: Optimal experiments for parameter estimation of microalgae growth models

Muñoz-Tamayo

Martinon

Bougaran

et al. 2014

Journal of Process Control

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Mathematical models are expected to play a pivotal role for driving microalgal production towards a profitable process of renewable energy generation. To render models of microalgae growth useful tools for prediction and process optimization, reliable parameters need to be provided. This reliability implies a careful design of experiments that can be exploited for parameter estimation. In this paper, we provide guidelines for the design of experiments with high informative content based on optimal experiment techniques to attain an accurate parameter estimation. We study a real experimental device devoted to evaluate the effect of temperature and light on microalgae growth. On the basis of a mathematical model of the experimental system, the optimal experiment design problem was formulated and solved with both static (constant light and temperature) and dynamic (time varying light and temperature) approaches. Simulation results indicated that the optimal experiment design allows for a more accurate parameter estimation than that provided by the existing experimental protocol. For its efficacy in terms of the maximum likelihood properties and its practical aspects of implementation, the dynamic approach is recommended over the static approach.

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Parametric sensitivity analysis for temperature control in outdoor photobioreactors

Cited by 11 publications

References 21 publications

Viability of biodiesel production from a thermophilic microalga in conventional and alternative culture media

Viability of biodiesel production from a thermophilic microalga in conventional and alternative culture media

Thermal Reactor Model for Large-Scale Algae Cultivation in Vertical Flat Panel Photobioreactors

Getting the most out of it: Optimal experiments for parameter estimation of microalgae growth models

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