filtration velocity
3.The results showed that the suitable filtration velocity was 0. 2m/s, the particle size in the moving bed was preferred in 1-2mm,and the bed thickness should be equal to or slightly more than 150mm.
4.Different methods are described to measure sludge sedimentation and filtration properties, by use of sedimentation indices, initial sedimentation velocity and capillary suction time (CST).
5.A needled dacron woolen cloth with good filtration ability is used as filtration medium,which provides high filtration efficiency, and good dust—cleaning effect. The dust filtration efficiency is up to 99.5— 99.8%. The pressure loss of the unit is 1.2—1.4 kPa at the wind velocity of 2—3m/min.
