(Solved): Q9:- Filtration - is carried out in -a plate and frame = filter press, with 20 frames 0.3m squar ...
Q9:- Filtration - is carried out in -a plate and frame = filter press, with 20 frames 0.3m square and 50mm thick, and the rate of filtration is maintained constant for the first 300 s...During this period, the pressure is-raised to 350KPa, and one-quarter of the total filter per cycle is obtained. At the end of the constant rate period, filtration is continued at a constant prissure of 350kPa for further 1800s, after which the fromes are fult: The total volume of filtrate per cycle is 0.7m3 and dismanting and refitting of the ress takes 500s It is decided to use a rotary drum filter, 1.5m long and 2.2m in diameter, in place of the filter press. Assuming that the resistance of the cloth is the same in the two plants and that the filter cake is incompressible, calculate the speed of rotation of the drum which will resuit in the same -overall rate of filtration as was obtained with the filter press. The filtration in the rotary filter is carried out at a constant pressure difference of 70kp n and the filter oprates. with 25% of the drum submerged in the slurry at any instant.