EESS talk on "The interplay of fluid mixing, chemical reactions and microbial processes in topologically complex environments"


Event details

Date and time 31.03.2020 12:1513:00  
Place and room
Speaker Dr Joaquin Jimenez-Martinez, Subsurface Environmental Processes Group, Dpt. Water Resources & Drinking Water, EAWAG
Category Conferences - Seminars
Soil is a porous and topologically complex environment. The flow field is a heterogeneous mosaic of high and low velocities, rheological properties, and partially miscible or immiscible phases (e.g., air and contaminants). Each of these parameters controls chemical mixing and reactions in environments of high structural complexity. The biochemical activities of microbes also play a major role, both in controlling the local fluid dynamics (by clogging and re-routing of flow due to biofilm formation) and the cycling of nutrients, trace elements, and contaminants in these environments. Firstly, we will consider the consequences of fluid mixing on the kinetics of fluid-fluid and fluid-solid reactions in porous media, focusing in particular on the impact of an immiscible phase such as air. Secondly, we will focus on the consequences of porous media geometry and boundary conditions on microbial processes, including bioclogging, bacterial chemotaxis, and soil respiration.

Short biography:
Dr. Joaquin Jimenez-Martinez leads the Subsurface Environmental Processes - SEP group (Eawag and ETH Zurich). He is Research Scientist at EAWAG (Swiss Federal Institute of Aquatic Science and Technology) and Lecturer at the Department of Civil and Environmental Engineering-ETH Zurich. 
After graduating (BSc) in Geological Sciences from University of Granada (Spain), and to obtain the Certificate of Advanced Studies in Geotechnical Engineering (MSc) at the Technical University of Catalonia (Barcelona, Spain) in 2007, he obtained a PhD degree in Subsurface Hydrology at the same university in 2010. He strengthened his research formation as Postdoctoral Fellow at the CNRS-University of Rennes 1 in France (2010-2012), being awarded as titular of the International Chair on Environment and Innovation (Foundation Rennes 1) (2012-2014), and as Post-doc Research Associate at Los Alamos National Laboratory, US (2014-2016). In 2016, he joined Eawag and ETH Zurich as leader of the Subsurface Environmental Processes group and Lecturer.
His SEP group focusses on the study of chemical transport and reactions and biological processes in porous and fractured media, particularly in multiphase systems. The group tackles these problems mainly by experiments performed over scales ranging from micromodels to field scale, and blending them with theory and modeling.


Practical information

  • General public
  • Free
  • This event is internal


  • EESS - IIE


  • Prof. Janet Hering, UPHERING-EPFL & EAWAG Directorate


Flow and transport porous media chemical mixing biofilms chemotaxis