PhD Thésis: Thermo-rheological of sludge by ultrasonic metrology : energy performance and fouling diagnosis – THERBUS

Discipline: Fluid mechanics

Line Manager: Nadine LOCOGE

Workplace: Douai

Type of contract and duration: PhD contract during 36 months

CONTEXT :

Public establishment belonging to IMT (Institut Mines-Télécom), placed under the supervision of the Ministry of Economy, Finance and Industrial and Digital Sovereignty, IMT Nord Europe has three main objectives: providing our students with ethically responsible engineering practice enabling them to solve 21st century issues, carrying out our R&D activities leading to outstanding innovations and supporting territorial development through innovation and entrepreneurship. Ideally positioned at the heart of Europe, 1 hour away from Paris, 30 min from Brussels and 1h30 from London, IMT Nord Europe has strong ambitions to become a main actor of the current industrial transitions, digital and environmental, by combining education and research on engineering and digital technologies.

Located on two main campuses dedicated to research and education in Douai and Lille, IMT Nord Europe offers research facilities of almost 20,000m² in the following areas:

• Digital science,

• Energy and Environment,

• Materials and Processes.

For more details, visit the School’s website : www.imt-nord-europe.fr

The position is vacant within the the Centre for Education, Research and Innovation in Energy and Environment (CERI EE) (https://recherche.imt-nord-europe.fr/energie-environnement-ceri/). The successful candidate will also become a member of the Complex Fluid Flows Laboratory, whose research focuses on complex fluids, complex flow phenomena, and their role in enhancing transport processes and process intensification.

CONTEXT AND OBJECTIVE :

The energy transition of wastewater treatment plants (WWTP) relies significantly on improving the performance of thermal exchanges within the facility. It is therefore crucial to optimize energy efficiency and minimize the fouling of heat exchangers. A primary example is the heat exchanger used for heating sludge under thermophilic conditions for anaerobic digestion, a key future pathway for material and energy recovery in WWTPs.

To ensure the efficiency of sludge-to-sludge exchangers and prevent fouling under high organic loads (4 kg VS/m3/d), precise knowledge of internal flow dynamics is essential. However, optimization is currently hindered by a major technological bottleneck: the total opacity of these particle-laden fluids prevents any optical access for conventional laser measurement tools. The objective of this thesis is to overcome this barrier through a purely experimental approach aimed at characterizing the thermo-rheology of sludge to diagnose fouling, using an innovative ultrasonic velocimetry (USV) metrological tool.

Partnerships and Institutional Framework

This thesis builds on the work carried out through an academic and industrial collaboration, which began in 2020 as part of the RHEOMETHA project, followed by i-TRANSBOUE in 2023. This partnership forms part of the Mocopée research program with the SIAAP. This is the Syndicat Interdépartemental pour l’Assainissement de l’Agglomération Parisienne, a public utility that transports and treats wastewater, rainwater and industrial effluent from the Paris metropolitan area every day. Established in 1970, it is the only interdepartmental water treatment authority in Europe and the first public utility operating across a European metropolitan area with the highest population density. Today, the SIAAP owns and operates six waste