In our study, amylase production was found to be increased steadily with the increase of agitation speed up to 150 rpm and the range of 140 170 rpm was found optimum (Table 1).
The pO2 saturation was 20%% controlled by stirring rate at range of 300 1300 rpm for FMY medium and 300 1500 rpm for FM1, with a mix of pure oxygen:air at 3 20 supplied upon reaching highest stirring rate.
Similarly, different range of aeration (180 rpm, 190 rpm, 200 rpm, 210 rpm and 220 rpm) were tested.
The basic challenge is to increase the power output but not the rpms, with a desirable working regime in the range of 120 160 rpm.
In contrast, there were small effects of agitation in the range of 100 750 rpm; thus, while increasing the mixing rate from 750 to 1000 rpm, the percentage removal decreased from 93.3 to nearly 91.1%%.
At 850 rpm the rotational Reynolds number, Re n, was 130, exceeding the transition number of 100 observed for STRs by Biń (1984) Complete mixing within 30 s at 180 rpm was reported, as were kL a values from 20 to 75 h-1 over the stirring speed range of 200 800 rpm.
The agitation was in the range of 600 1000 rpm.
At each starting concentration, fiber diameter remained constant over a wide range of mandrel RPM.
In the range of 2 6 rpm the degradation rate increased almost linearly with disk angular velocity.
