Feedback linearizing control of light-to-microalgae ratio in artificially lighted photobioreactors

Ifrim, George; Titica, Mariana; Boillereaux, Lionel; Caraman, Sergiu

doi:10.3182/20131216-3-in-2044.00038

Cited by 10 publications

(20 citation statements)

References 15 publications

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“…The simulation conditions are those given by Table 10 lag phase of the microalgae growth) and then becomes higher than expected at the end of the culture (corresponding to an exponential phase of the microalgae growth). This model of growth rate translates the adaptation of microorganisms at the beginning of the culture (up to 2 days) to the cultivation conditions [14]. In our case, the following specific growth rate was considered:…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Recent studies aim at improving the batch culture by optimizing the light supply so that the phenomena of photolimitation and photoinhibition are reduced, [3,8,14,17]. It was concluded that an incremental light supply reduces energy consumption compared to a conventionally operated PBR, for the same cell production.…”

Section: Lumostatic Operating Modementioning

confidence: 99%

“…The main approaches involve the specific light uptake rate, [6,19], (and its particular formulation named light-to-microalgae ratio, [14]); and the cell growth rate, [3,17]. In this study, these two approaches will be investigated and compared (in Sects.…”

Section: Lumostatic Operating Modementioning

confidence: 99%

“…The objective is to maximize the efficiency of the light use while maximizing the quantity of the produced biomass in a given duration. The control of the light energy is a recent concern in the scientific community, [14,17]. The objective is to improve further the bioprocess efficiency by means of advanced control strategies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimal Operation of a Lumostatic Microalgae Cultivation Process

Tebbani

Titica

Ifrim

et al. 2015

Lecture Notes in Control and Information Sciences

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International audienceThis chapter proposes the optimization of batch microalgae cultures in artificially lighted photobioreactors . The strategy consists in controlling the incident light intensity so that the microalgae growth rate is maximized. Two approaches were developed and compared. In the first one, the ratio between the incident light intensity and the cell concentration (light-to-microalgae ratio) is optimized, either offline or online, and then maintained at its optimal value. In the second approach, the cells growth rate is maintained at its optimal value by means of nonlinear model predictive controller (NMPC). The proposed control strategies are illustrated and their efficiency is assessed, in simulation, for Chlamydomonas reinhardtii batch cultures. The proposed lumostatic operation strategies are shown to lead to a higher cell productivity and to a more efficient light utilization in comparison to conventional constant light operation approach

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Lumostatic Operating Modementioning

confidence: 99%

Section: Lumostatic Operating Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimal Operation of a Lumostatic Microalgae Cultivation Process

Tebbani

Titica

Ifrim

et al. 2015

Lecture Notes in Control and Information Sciences

Self Cite

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show abstract

“…In this application, the photobioreactor system is programmed to operate in a constant biomass density mode, to maintain the culture at the optimal population density and to sustain high biomass production levels. An adaptive control approach can be found in [49], while in [50] a feedback linearization over the light-to-biomass concentration control was proposed, introducing this new variable as the manipulated one. Later, in [51] an optimization of biofuel production through ANN modeling was realized.…”

Section: Background On Model-based Control Of Cultures Of Microalgaementioning

confidence: 99%

Experimental Study of Substrate Limitation and Light Acclimation in Cultures of the Microalgae Scenedesmus obliquus—Parameter Identification and Model Predictive Control

et al. 2020

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In this study, the parameters of a dynamic model of cultures of the microalgae Scenedesmus obliquus are estimated from datasets collected in batch photobioreactors operated with various initial conditions and light illumination conditions. Measurements of biomass, nitrogen quota, bulk substrate concentration, as well as chlorophyll concentration are achieved, which allow the determination of parameters with satisfactory confidence intervals and model cross-validation against independent data. The dynamic model is then used as a predictor in a nonlinear model predictive control strategy where the dilution rate and the incident light intensity are simultaneously manipulated in order to optimize the cumulated algal biomass production.

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