STEYER , Jean-Philippe

Microalgae based processes have been actively studied in the last decades with perspective for food, feed, and source of chemicals such as biofuels. Most of the developments focused on monospecific culture of microalgae, with dedicated practices to avoid any contaminations. However, interactions between microalgae and bacteria are likely to...

The most promising and yet challenging application of microalgae and cyanobacteria is the production of renewable energy: biodiesel from microalgae triacylglycerols and bioethanol from cyanobacteria carbohydrates. A thorough understanding of microalgal and cyanobacterial metabolism is necessary to master and optimize biofuel production yields....

The conversion of microalgae lipids and cyanobacteria carbohydrates into biofuels appears to be a promising source of renewable energy. This requires a thorough understanding of their carbon metabolism, supported by mathematical models, in order to optimize biofuel production. However, unlike heterotrophic microorganisms that utilize the same...

Reply to the Comment on "Mathematical modeling of unicellular microalgae and cyanobacteria metabolism for biofuel production" by Baroukh et al. [Curr. Opin. Biotechnol. 2015, 33:198–205]

Metabolic modeling of microalgae growth and lipids production during day/night cycles and nitrogen starvation. Metabolic Pathway Analysis 2015

This paper proposes a new model describing the algae-bacteria ecosystem evolution in an outdoor raceway for wastewater treatment. The ALBA model is based on a mass balance of COD, C, N and P, but also H and O. It describes growth and interactions among algae, heterotrophic and nitrifying bacteria, while local climate drives light and...

The ability to predict water evaporation from shallow ponds is needed to accurately assess the water demand and costs of microalgae farming. This study assessed the accuracy of seven evaporation models available in the literature against experimental data collected in a raceway algal pond located in Narbonne, France. A theoretical 'flat-plate'...

The first objective of this study is to assess the predictive capability of the ALBA (ALgae-BActeria) model for a pilot-scale (3.8 m 2) highrate algae-bacteria pond treating agricultural digestate. The model, previously calibrated and validated on a one-year data set from a demonstrative-scale raceway (56 m 2), successfully predicted data from...

This paper deals with the reduction of the ADM1 using the "state-variable association" method, to calibrate a simple model of microalgae anaerobic digestion (the MAD model). In simulation, we show that the behavior of the calibrated MAD model and of the ADM1 are identical. Using experimental data, the calibrated MAD model predicts well the real...

Many studies have used the Life Cycle Assessment (LCA) methodology to assess the environmental impacts and energetic suitability of microalgal biofuels. This paper presents a critical review focused on goal and scope, system boundaries, functional unit, Life Cycle Inventories (LCI) and environmental impacts of 41 LCA of algal biofuels. The...

A new approach to unravel metabolic regulations. Application to microalgae growth and lipid production under day/night cycles and nitrogen starvation. BioSynSys 2015 : 1er colloque du GDR "Biologie de Synthèse et des Systèmes"

International audience

International audience

The present study is an extension of the promising work performed by Jimenez et al. (2014). They developed an organic matter characterization methodology based on 3D fluorescence spectroscopy and chemical extractions. The objective was to predict both biodegradability and bioaccessibility to characterize the anaerobic digestion model input...

Microalgae can be grown with wastewater in order to reduce the production cost, and recycle nitrogen and phosphorus from waste. Indeed, microalgal systems show great potential for extensive nutrient removal in wastewater treatment. High Rate Algal Ponds (HRAPs) however contain other organisms whose impact can be strong on the process dynamics....

Cultivation of microalgae in wastewater and digestate has received special attention during the last years due to the potential for nutrient, CO2 and/or heat recovery and recycling. However, understanding microalgae-bacteria interactions remains a major concern for process operation and control. This paper aims to develop a new mathematical...