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Abstract: Anaerobic digestion of biowaste allows a sustainable production of bioenergy and reduces environmental burden. The anaerobic digestion phase was modeled with Anaerobic Digestion Model No. 1 (ADM1), which was extended to include three genera of propionate‐oxidizing bacteria and two routes of propionate degradation, namely methyl‐malonyl CoA and C6‐dismutation pathway. Kinetic parameters for anaerobic propionate oxidation were determined with defined tricultures of the three propionate‐oxidizing genera together with hydrogenotrophic and acetotrophic methanogens and implemented into ADM1, resulting in the improved model ADM1xpro. [ABSTRACT FROM AUTHOR]

The enzymatic hydrolysis of methyl octanoate via immobilized Candida antarctica lipase B was studied as an exemplary reference system from the field of enzymatically catalyzed liquid-liquid-solid systems. The experimental investigation of this system was performed in an innovative recycle packed-bed reactor with continuous liquid-liquid phase separation. This setup allows for both a biphasic as well as a singular phase reactor feed. For the first time, a holistic experimental investigation of both operation modes at various operating conditions was conducted. In addition to the presentation of the experimental results, the basics of the mathematical modeling are shown and a model validation is performed. [ABSTRACT FROM AUTHOR]

The integration of electrolysis-H2 from renewable electricity (wind, solar) in the production of liquid hydrocarbon energy carriers may transfer the fluctuating nature of renewable energies to the chemical process. By means of a mathematical model step-change experiments in a lab-scale reactor were analyzed to gather information about catalyst behavior under transient conditions. First results suggest that reaction kinetics determined under steady-state conditions are sufficient to characterize transient operation. [ABSTRACT FROM AUTHOR]