1. a Chemical and Biochemical Reactor Engineering and Safety (CREaS), Chemical Engineering Department, KU Leuven, Celestijnenlaan 200f box 2424, 3001 Heverlee, Belgium
2. b Center for Microbial Ecology and Technology (CMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium