Dry solids conveying

When a decanter is operated to obtain the driest cake from a compressible sludge, the decanter bowl will be virtually full of cake [9], from front to rear, with next to no volume of clear supernatant. The dryness of the cake, as will be seen in Section 4.9.3, with a constant torque, is inversely proportional to the volume of the cake. 

In a dry solids decanter, there is generally a restriction, for example a baffle disc, against which the conveyor compresses the cake. Sometimes the cake discharge aperture forms the restriction or acts as an extra restriction in series 

It is generally found that, with a properly operated dry solids decanter, the scrolling capacity at the point of maximum restriction, the smallest area, is greater than that calculated using equation (4.69), but less than that predicted by the equation at any other restriction in series. 

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