DDS vacuum pressure filter

A variation of the same principle is the DDS-vacuum pressure filter which has a number of small disks mounted on a shaft which rotates discontinuously. The cake is formed on both sides of the disks when they are at the bottom position, dipped into the slurry. When the disks come out of the slurry and reach the top position, hydrauhcaHy driven pistons squee2e the cake and the extra Hquid then drains from both sides of the cake. The cake is removed by blowback with compressed air. 

Johnsen, A. E., Madsen, R. E. and Nielsen, W. K., DDS-vacuum pressure filter , 2nd World Filtration Congress 1979, pp. 163-171, Filtration Society, London (1979)... 

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