On the effect of biogas bubbles in anaerobic digester mixing

• The role of biogas bubbles in mixing is significant lower mixer rotation speeds. Considering bubble creation does not change the velocity gradient. 1-cm/s threshold for dead volume can show generation effect. A strategy capable handling a suitable agitation within digester tanks necessity order to assure continuous contact substrates and degraders inside bioreactors. As an energy demanding process, needed proper contributes overall efficiency digesters. In current study, aim assess incorporation into anaerobic digesters wastewater treatment plants (WWTP) with without external vertical mixer, analyze possibility considering as imperative factor scenario. Computational fluid dynamics (CFD) prepares opportunity simulate stirred tank digester, combination Eulerian Lagrangian platform. amount volume, average velocity, gradient particle trajectories are analyzed discussed. Our key findings follows: reduction tank, once there no rotating mixing, or speed low. However, either low high have considerable effect