Theoretical and experimental study of the processes of water purification in a biofilter

Startup simulation for a rotating biological contactor

“…The time taken for this quantity to come to the steady state is about 150 days. On the one hand, this can be explained by the weak influence of the mechanism of erosion on the process (its intensity depends on the intensity of rotation in a power law manner according to (11)); on the other hand, the intensity of biochem ical reaction is also low. During the pumping of the biofilm with the substrate, oxygen is consumed in a sufficient quantity to noticeably limit the rate of the biochemical reaction.…”

“…OF THE PROBLEM In the simplified form, the mathematical model [10][11][12][13] is formulated as four ordinary differential equations describing biochemical reactions in the bio film formed on a disk at the distance R from the rota tion axis and mass transfer between the biofilm and the surrounding medium:…”

“…The estimate of the maximum allowable erosive action can be derived from Eq. (4) as (11) SPECIFIC FEATURES OF THE CALCULATIONS As calculations show (Fig. 2a), because of the change of the biofilm habitat (liquid-air), the flux of the substrate J S is a rapidly varying discontinuous function of time.…”