Einsatz eines Online-Methanol-Messsystems zur Regelung von Zulaufsatzkultur-Fermentationen

For the optimization of fed-batch fermentations of methylotrophic organisms an online measuring method is presented, with which the methanol concentration in the medium during a fermentation can be determined by a purge gas pervaporation principle. In contrast to other analytical methods, this measuring method offers the possibility of maintaining the substrate concentration at a controlled value in processes with methanol as the central substrate. Difficulties, but also their overcoming in the adaptation of the measuring method to fermentation processes are described.     

Ansatz zur Quantifizierung der mechanischen Festigkeit eines Staubkuchens

In surface filtration for dust separation, the mechanical strength of dust cakes is of great importance for the operating behavior of the surface filter. This can be significantly influenced by various conditioning methods. A simple measurement method to quantify the strength of dust cakes does not exist at present. An approach for the experimental determination of the strength of dust cakes with measurement results comparing dust cakes with modified packing structur, generated by doing raw gas conditioning with hygroscopic salt particles, is presented and discussed.     

Vergleich analytischer und sensorischer Methoden zur Beurteilung der Geruchsminderungsleistung eines Festbettadsorbers

The odor emissions of a coffee processing company were reduced applying a fixed bed adsorber pilot plant. In order to evaluate the performance, breakthrough curves were determined using a flame ionization detector, portable electronic noses, olfactometry and analytical methods. The analytic identification of odorants and pollutants was carried out via enrichment on Tenax TA and on SPME fibers. Several odorants were identified, which determine the overall olfactory sensation. Furthermore the breakthrough behavior of different adsorbents was characterized. The olfactometric concept was applied first‐time for the electronic noses.