We congratulate Dr.-Ing. Michael Ahmadi on the successful defense of his dissertation titled „Provision of reclaimed water as an alternative water resource for non-potable applications: multibarrier approach for pathogen control and chemical risk management“ on October, 17 2025. The review committee was comprised of Prof. Dr. Stuart Khan, University of Sydney (Australia). Prof. Dr. Brigitte Helmreich and Prof. Dr. Jörg E. Drewes.