Recently, I had the opportunity to give a talk on the topic of the optimization of the feed material of a biogas plant, at the 15th Workshop on Quality Improvement Methods in Dortmund, Germany. The slides can be found in the presentations section of this site.
I really liked the active discussions at the Workshop. So thanks again to the organizers for inviting me. See also the nice photo of the participants here:
(external link:) https://www.statistik.tu-dortmund.de/qim15.html
You can also find the program and abstracts of all the talks via the above link.