Jérémy Pruvost

Jérémy Pruvost
University of Nantes | UNIV Nantes · Laboratoire de génie des procédés, environnement, agroalimentaire (GEPEA)

Professor

About

183
Publications
50,525
Reads
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5,189
Citations
Citations since 2017
67 Research Items
2877 Citations
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20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
Introduction
Jérémy Pruvost obtained a PhD in Chemical Engineering in the University of Nantes (on hydrodynamics optimisation in photobioreactors). He is working in the University of Nantes within GEPEA laboratory since 2002 (Assistant Professor and then Professor in 2008). He is working in photobioreactors engineering, especially in the field of bioenergy production using microalgae (biohydrogen production, lipids production for biodiesel use, and development of solar technologies of photobioreactors).
Additional affiliations
May 2018 - present
University of Nantes
Position
  • Head of Department
Description
  • www.gepea.fr
May 2015 - present
University of Nantes
Position
  • Head of Department
Description
  • www.algosolis.com
October 2008 - present
University of Nantes
Position
  • Professor (Full)
Education
September 1992 - July 2000
University of Nantes
Field of study
  • Mechanical Engineering - Chemical Engineering

Publications

Publications (183)
Article
Full-text available
Current microalgae biofuel production pathways are still far from being energetically self-sufficient. Simulations scenarios (1 t·y⁻¹ of biomass) under a purely energetic perspective, have revealed some bottlenecks mainly in the cultivation and metabolite recovery processes. Technologies such as intensified photobioreactors such as AlgoFilm©, infra...
Article
Full-text available
Haslea ostrearia is a pennate diatom that produces marennine, a water-soluble blue pigment responsible for the greening phenomenon and the increase of organoleptic quality of oysters. Apart from the oyster industry, there is a growing interest in the mass cultivation of this diatom due to the biological activities of marennine. To gain knowledge ab...
Article
Outdoor raceway ponds for microalgae cultivation suffer from low biomass productivity due in part to the low photosynthetic photon flux received by the microalgae culture in the mornings and evenings and during the winter months at middle and high latitudes. This study explores the use of external mirrors to reflect additional sunlight onto the cul...
Article
Nitrogen limitation and changing solar conditions are both known to affect triacylglycerol (TAG) production in microalgae. This work investigates the optimization of TAG production with a continuous nitrogen‐limited culture of Nannochloropsis gaditana in simulated day‐night cycles. The effect of day‐night cycles was firstly investigated in nitrogen...
Article
The demand for aquaculture feed will increase in the coming years in order to ensure food security for a growing global population. Microalgae represent a potential fish-feed ingredient; however, the feasibility of their sustainable production has great influence on its successful application. Geographical locations offering high light and temperat...
Article
There are certain advantages in applying an airlift photobioreactor (PBR) intended for microalgae culture to a building façade, such as making use of the solar illuminated surfaces and the possibility of chemical recycling through photosynthetic growth (utilizing the carbon dioxide emissions from boiler combustion, for example). This study concerns...
Article
This study aims at investigating the role of bubbles passage to prevent biofouling in thin-gap bubble column photobioreactors (PBRs) where the biomass concentration is important and the reactor thickness is low. Different types of gas sparging are tested in a square channel with a cross-section of 4x4 mm² mimicking a thin-gap bubble column PBR. Fir...
Article
The impact of bubble passage on wall hydrodynamics is investigated in a square channel with a cross section of 4×4 mm². The effect of bubble size and frequency is put into evidence. Shadowgraphy, PIV and polarography are used to characterize respectively the bubbles, the liquid velocity field and the wall shear stress. The objective is to put forwa...
Article
Haslea ostrearia is a marine diatom known to produce and excrete the marenine blue pigment. Its controlled, continuous and intensified cultivation remains a challenge. Thus, a submerged membrane photobioreactor (MPBR) was implemented in order to simultaneously and continuously cultivate H. ostrearia and extract marennine. The MPBR was compared with...
Presentation
Full-text available
General conference on the microalgae industrial valorisation: the potential, where we are, and the limits
Chapter
This paper focuses on continuous operation of a closed solar photobioreactor using a feedback linearizing control strategy, maximizing productivity, by acting on dilution rate. Lumostatic and turbidostatic operations were investigated in simulation, using a dynamic model from the literature. This model couples a radiative model describing light gra...
Article
Full-text available
An efficient use of light is essential to achieve good performances in microalgae cultivation systems. This can be challenging particularly under solar conditions where light is highly dynamic (e.g., day/night cycles, rapid changes in wind and weather conditions). Microalgae display different mechanisms to optimize light use efficiency. In the shor...
Article
A miniaturized, small-scale photobioreactor (PBR) known as EOSS2-PBR (Efficient Overproducing Screening System photobioreactor) has been developed to characterize microalgal growth under controlled conditions. As with similar systems, EOSS2-PBR allows the screening of either culture conditions or species performance, but it is also specially design...
Article
The aim of this work is to track and optimize lipid recovery from Nannochloropsis gaditana in wet extraction operations. No significant differences in biomass concentration were found when disrupting microalgal suspensions of up to 30 g/L dry weight, but disruption efficiency differed depending on their physiological states. It took 5.8 min in a be...
Article
Full-text available
The benthic diatom Haslea ostrearia which has the capacity to excrete a blue pigment called marennine remains a challenging organism to culture in a photobioreactor (PBR). This study investigates the interest of culture in conventional mixed PBR over immobilized-cell protocols which proved successful but have rather low extracellular marennine (EMn...
Article
Full-text available
Temperature and light are two of the most crucial factors for microalgae production. Variations in these factors alter their growth kinetics, macromolecular composition and physiological properties, including cell membrane permeability and fluidity. The variations define the adaptation mechanisms adopted by the microalgae to withstand changes in th...
Article
An experiment was set up using a well-controlled photobioreactor to characterize the CO2 transfer and assimilation by photosynthetic microorganisms. This lab-scale system enabled accurate monitoring of the carbon sources in liquid and gas phases for in-depth characterization of the CO2 physical transfer and biological consumption of dissolved carbo...
Article
To identify action levers that improve the environmental balance of Spirulina manufacture, this work presents an LCA study of a modelled Spirulina production coupled with Morris sensitivity analysis on the model parameters. The study concerns a hypothetical cultivation surface of 388.5 m² in open and covered raceway ponds (ORP and CRP) under greenh...
Article
Full-text available
Energy-storage metabolites such as neutral lipids and carbohydrates are valuable compounds for liquid biofuel production. The aim of this work is to elucidate the main biological responses of two algae species known for their effective energy-rich compound accumulation in nitrogen limitation and day–night cycles: Nannochloropsis gaditana, a seawate...
Article
Full-text available
In this work, a new methodological approach, relying on the high specificity of enzymes in a complex mixture, was developed to estimate the composition of bioactive polysaccharides produced by microalgae, directly in algal cultures. The objective was to set up a protocol to target oligomers commonly known to be associated with exopolysaccharides’ (...
Article
This study deals with the development of a self-sustained passive thermal regulation technique in Algofilm © solar photobioreactor. The reported experimental investigation includes, the evaluation of an average equivalent condensate film thickness, in indoor operating conditions, as function of the flowing liquid Tl and ambient Tamb temperatures, i...
Article
Full-text available
This study investigates the effect of condensed water droplets on the areal biomass productivity of outdoor culture systems with a free surface, protected by a transparent window or cover to prevent contamination and to control the growth conditions. Under solar radiation, evaporation from the culture causes droplets to condense on the interior sur...
Article
Full-text available
A microorganism culture process is a complex system in which physical operating parameters and biological responses strongly interact. Mathematical formulation and modelling of the different phenomena involved in the process...
Article
The need for thermal regulation in microalgal photobioreactors is a significant impediment to their large-scale adoption. The energy costs associated with thermal regulation alone can easily result in a negative energy balance. Self-sustaining photovoltaic powered photobioreactors that do not require cooling systems provide an opportunity to maximi...
Article
Microalgae are recognized as source of proteins for nutraceuticals, food additives and bioactive peptides. Also, the exploitation of the protein fraction can contribute to reach the profitability of the microalgal biorefinery. Among the available technologies, membrane filtration is one of the most sustainable and cost-effective technique for the p...
Article
This study elucidates the effect of colony formation on light absorption by Botryococcus braunii microalgae cells. The spectral average mass absorption cross-section of suspensions of B. braunii cultures with free-floating cells or colonies was measured experimentally across the photosynthetically active radiation region. The average mass absorptio...
Article
Full-text available
Design dark fraction reflects the unlit part of a microalgal culture system, as for example a hydraulic loop used for temperature or pH regulation, or a circulating pump for mixing purposes. This study investigates the impact of design dark fraction on photosynthetic biomass productivity of the eukaryotic microalgae Chlorella vulgaris. The effect o...
Article
Full-text available
Chlorella sp. is both an important model for green algal photosynthesis and is produced using industrial scale photobioreactors. In photobioreactors, cells travel through steep gradients of illumination at rates determined by photobioreactor design, mixing rates, culture density and surface irradiance levels. We used non-invasive, rapid fluorescenc...
Article
High concentrations of dissolved oxygen can inhibit the growth of photosynthetic microorganisms in microalgal culture systems. Not taking into account this parameter can also affect the reliability of mathematical models predicting biomass productivity. This study investigates the impact of high dissolved oxygen concentrations (C O₂) on biomass pro...
Conference Paper
This study investigates simultaneous pH and dissolved oxygen control (DO) in a closed photobioreactor (PBR), using a conventional linear feedback technique, i.e. individual PID and PID coupled with feedforward compensation. The proposed control scheme has been designed using linear approximations, whereas their evaluation has been done through simu...
Article
Full-text available
The red microalga Porphyridium cruentum is exploited industrially for its exopolysaccharides (EPS) and pigments production. EPS produced by P. cruentum are partially released and dissolved into the surrounding environment, they can be recovered from the culture medium after removing the cells. This paper presents a parametric study of the ultrafilt...
Article
Full-text available
This work is devoted to a non-intrusive experimental approach, based on Laser Multi-reflection technique, in the investigation of thickness distribution variations and wave’s dynamics of a liquid film flowing over an inclined plane. This investigation was first founded on the needs of quantifying the liquid film thickness and on minimizing, as much...
Article
Full-text available
This study aims to investigate the triacylglycerol (TAG) productivity of Parachlorella kessleri grown under continuous illumination and to investigate its metabolism in simulated day/night cycles in order to estimate the feasibility of a large-scale production in outdoor solar photobioreactors. The strain was chosen for its ability to accumulate la...
Conference Paper
Full-text available
Keywords : solar culture, optimization, temperature, light conversion Microalgal culture in solar conditions is developing rapidly, because of the increasing demand of large-scale production capacities for various applications such as for food or feed industries. Nowadays, this concerns both open and closed (photobioreactor) geometries. Whatever th...
Article
Full-text available
An integrated screening approach was developed to assess the potential of the Botryococcus genus for the production of lipids for biofuel application (hydrocarbons and triacylglycerols). The strategy developed in this study permitted to rigorously measure mandatory parameters for the determination of strain performance – i.e. growth rate and oil co...
Article
This paper experimentally and theoretically investigates light transfer in agar-immobilized cell cultures. Certain biotechnological applications such as production of metabolites secreted by photosynthetic microorganisms require cells to be immobilized in biopolymers to minimize contamination and to facilitate metabolite recovery. In such applicati...
Patent
Procédé de préparation d'un extrait liquide riche en phycocyanine à partir de cyanobactéries ou de micro-algues renfermant de la phycocyanine, comprenant une étape de lyse cellulaire d'une suspension aqueuse des dites cyanobactéries ou micro-algues fraîches, une étape de macération du lysat obtenu, pendant plusieurs heures dans une solution de cati...
Article
Measuring biofuel sustainability requires dealing with a wide variety of complex and conflicting values at stake. Consequently, the biofuel capacity to contribute to one specific value cannot lead to any absolute conclusion about the overall sustainability of biofuel. The scope of the sustainability concept may vary depending on individuals’ prefer...
Article
This study aims to quantify systematically the effect of non-absorbing cap-shaped droplets condensed on the backside of transparent windows on their directional-hemispherical transmittance and reflectance. Condensed water droplets have been blamed to reduce light transfer through windows in greenhouses, solar desalination plants, and photobioreacto...
Presentation
Full-text available
The University of Nantes is proposing an International Master’s Degree in Microalgae Bioprocess Engineering. It proposes courses needed to develop industrial processes for microalgae valorisation, from production to final extracted products More information are available on http://web.polytech.univ-nantes.fr/1383057714098/1/fiche___pagelibre/&RH=13...
Article
Full-text available
One of the main parameters affecting autotrophic algae cultures is photon absorption distribution inside the photobioreactor. This clearly depends on the geometry of both the radiation source and the photobioreactor, as well as on algae suspension optical properties. In this work the local volumetric rate of photon absorption LVRPA in a cross-secti...
Article
For biodiesel applications, microalgae and especially Nannochloropsis sp. are considered as a promising feedstock for lipid production. Main issues are high lipid productivity, but also robust and energy efficient downstream processes. In the biorefinery process, cellular mechanical pretreatment and solvent extraction are investigated nowadays to a...
Article
This work presents the rational development up to its final characterization and validation of an intensified solar photobioreactor (PBR) for microalgal production, AlgoFilm©. Our aim was to achieve very high volumetric performance for phototrophic conditions, in the range of that found in fermentation processes.
Article
Full-text available
The biomass, generated after the lipid extraction from Nannochloropsis microalgae (LEM) for biodiesel production, demonstrated its suitability for both energy and nutrient recovery. The anaerobic digestion of LEM produced a minimum of 268 mL(CH4)/g(vs) in different experiments. The codigestion of LEM and sewage sludge revealed that both wastes can...
Patent
The invention relates to a method for producing membrane polysaccharides from an organism selected from a micro-organisms, unicellular organims and filamentous fungi, said method comprising at least one step of extracting said membrane polysacchraides as well as a smaller-scale extraction of soluble proteins, by mechanical of said organism in a bal...
Article
Although the hydrothermal liquefaction is considered a promising technology for converting microalgae into liquid biofuels, there are still some disadvantages. This paper demonstrated that the bio-oil yield can be significantly improved by adding alcohols as co-solvents and carrying out the conversion at mild conditions (<250°C), but at the expense...