The decline of the iron, steel and mining industries in the Noth of France has led to the appearance of wastelands, characterized by various contaminations. The contamination of soils by organic and inorganic pollutants is a major problem. Gentle remediation techniques, based on the use of bioaccumulator plants, are being studied to manage these soils, in particular with the cultivation of miscanthus and hemp. Currently, the valorization of these bioaccumulator plants is carried out by energy valorization. However, these plants can be sources of molecules of interest and can therefore be enhanced by extracting these functional biomolecules. To extract these biomolecules, innovative processes, known as eco-processes, make it possible to obtain better extraction yields using less time, safe solvents, less energy and generating less environmental impact.
In collaboration with Junia-ISA and the UMRt BioEcoAgro-Charles Viollette Institute (Polytech’Lille-Université de Lille), the thesis project aims to identify ways of plants valorisation using eco-extraction techniques. The plants are provided by the Environment LGCgE-ISA laboratory. Three eco-extraction processes will be studied and compared to conventional extractions: ultrasound-assisted extraction, microwave-assisted extraction, and microwave and ultrasound-assisted extraction. The performance of these processes (extraction yields, activity of extracts, energy consumed, environmental impacts) in the batch regime will be evaluated by seeking the optimal conditions including the performance and environmental assessment criteria. The extracts obtained will be analyzed (UV-Visible spectrophotometry) to determine the molecules present in the extract as well as their concentration.
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required skills:
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The candidate should have good skills for reading scientific articles, for experimentation, analytical, writing and communication skills (in French and English). Knowledge of process engineering would be an asset. Excellent interpersonal skills, thoroughness and a good ability to work in a team are expected. The student will carry out his / her activities in the research laboratory located in the Materials department as well as in the laboratory located in the premises of Polytech Lille (Villeneuve d'Ascq, University of Lille).
