About Stefan Jansen

Stefan Jansen works on practical solutions for problems in the soil and water system where chemistry and/or microbiology play a role. Examples are reducing emissions of nitrogen and phosphorus from agriculture to surface water and corrosion protection of steel infrastructure. Stefan uses his applied and specialist knowledge and experience with lab and field work for this. He looks for solutions in collaboration with researchers from other fields, but especially with people from practice, such as water authorities, agricultural organizations and energy companies. Connecting knowledge and putting it into practice creates added societal value. He links scientific knowledge with application in urgent social topics such as agriculture and water quality, energy transition and climate change. Within Deltares, his work fits in with Moonshot Resilient and healthy water systems, Sustainable energy transition and Resilient Infrastructure.

Examples of projects:

• Puridrain: filter systems for nitrogen and phosphorus from agriculture.
  In the Puridrain project, Deltares has developed and tested filter systems together with water authorities and the agricultural sector to reduce emissions of nitrogen (N) and phosphorus (P) from agriculture to surface water. These measures have been tested in the field and contribute to practical solutions to combine agriculture with water quality.
• Corrosion protection of pipes, sheet piling and offshore wind turbines
  Corrosion can occur anywhere steel comes into contact with water. Microorganisms can accelerate this process. Good corrosion protection is therefore essential. In various projects, Deltares has investigated when corrosion occurs and what countermeasures are possible. This has led to practical advice that helps owners of steel infrastructure achieve more cost effective corrosion protection with fewer negative side effects
• Hydrogen storage in the subsurface
  Hydrogen is a promising means of storage and transport for sustainable energy. However, when stored underground, microbiological reactions can occur, resulting in hydrogen loss or undesirable side effects. Little is known about this yet. Deltares investigates these processes with models and lab and field work, thus contributing to more efficient and safer hydrogen storage.