Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PhD : selection by topics

Technological challenges >> Green and decarbonated energy incl. bioprocesses and waste valorization
2 proposition(s).

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Recycling of fluorinated polymers contained in new technologies for energy (NTE)

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire des Eco-procédés et EnVironnement



Green and decarbonated energy incl. bioprocesses and waste valorization (.pdf)

Fluoropolymers are today very widely used for their mechanical and chemical properties and their durability. Polymers are unavoidable in the field of NTEs such as proton exchange membrane fuel cells (Nafion membrane in PEMFCs), batteries (PVDF at electrodes), or photovoltaic panels (EVA at the glass cell interface). With the advent of carbon-free technologies, the issue of recycling has become central to bringing these technologies to market. Historically, recycling processes were designed for processing different technologies and large volumes. This has led to the establishment of pyrometallurgical processes (high temperature) that are robust, but destructive and non-selective. In a context constrained by strategic, legislative (recycling rate) and environmental issues, it is necessary to recycle "more" and "better". This thesis aims at finding new wet or dry ways for the treatment of fluorinated compounds. The use of ionic liquids for the solubilization of polymers will be a preferred route. Their intrinsic physicochemical properties (very low volatility and flammability) make them ideal candidates for overcoming safety and environmental issues. The thesis work will be divided into three parts. Firstly, a state of the art will be realized for the evaluation of conventional processes and media for the treatment of fluorinated compounds. The state of the art will be tightened on the fluorinated polymers used in the field of new technologies for energy (NTE). A second part will deal with the chemistry of polymers and solvents in which a polymer can be dissolved. A third part of a fundamental nature will aim at linking the macroscopic results to the structural evolutions of the polymers.

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Intensification of carbon dioxide sequestration through microalgae photosynthesis





Green and decarbonated energy incl. bioprocesses and waste valorization (.pdf)

Numerous scientific studies, led in particular by IPCC, have shown that anthropogenic greenhouse gas emissions are responsible for global warming of Earth's atmosphere. Due to the tremendous volumes emitted worldwide annually (more than 30 billion metric tons), CO2 is considered to be one of the main contributors to global warming. Among the methods for sequestering CO2, photosynthesis is particularly attractive, since it makes it possible to create different products through to the capture of solar energy together with CO2. This PhD thesis will focus on the use of microalgae photosynthesis for CO2 sequestration. After a bibliography step which will allow the student to better understand the equilibria at stake and the corresponding equations, first part of the work will focus on the development of an analytical model allowing to simulate different operating conditions by a multidisciplinary approach (in particular fluid mechanics, chemistry and biology). After validation of this model on simple experiments made up with a strain of reference, an innovative culture device (photobioreactor) making it possible to intensify the mass transfers of a gas phase enriched in C02 towards microalgal biomass could be proposed, developed and tested.

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