Kinetic study on fermentation from CO2 and H2 using the acclimated-methanogen in batch culture

✍ Scribed by Zhen Ya Zhang; Takaaki Maekawa

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 719 KB
• Volume: 4
• Category: Article
• ISSN: 0961-9534
• DOI: 10.1016/0961-9534(93)90065-c

✦ Synopsis

Almtrae-Methane was produced from H, and CO2 using the acclimated-tied methanogens in a 3.7 1 fermentor in batch culture at pH 7.2 and 37°C. The Fermentation kinetics parameter for the growth of methanogens, overall mass transfer coefficient of the reactor, and the conversion rate of H, and CO, to CH, by the acclimated-mixed culture were determined using the technique of Vega et al." The maximum specific growth rate (k)

and H, specific consumption rate (q_) were found to be 0.064 (h-l) and 104.8 (mm01 h-' g-l), respectively. Monod saturation constants for growth (Kp) and for inhibition (K'p) were found to be 3.54 @Pa) and 0.57 @Pa), respectively. These findings indicate that without very low dissolved H, levels, the fermentations are carried out under h, and the specific uptake rate (q) was almost not a&ted at any dissolved H, level in the range studied. The yield of CH, (Yp/s) was calculated to be 0.245 (mol CH, mol-' Hz), which is near the stoichiometric value of 0.25. DH, was also measured using the Teflon tubing method and was in good agreement with those estimated by kinetic calculations.