Disc-bowl centrifuge

The conical discs in a disc bowl centrifuge split the liquid flow into a number of very thin layers, which greatly increases the separating efficiency. Disc bowl centrifuges are used for separating liquids and fine solids, and for solids classification. 

X Distance parallel to discs in disc bowl centrifuge m L... 

Disc bowl centrifuge Partly continuous operation, high centrifugal force, liquid discharge under pressure, laborious cleaning Poor dewatering— works only with low sohds content... 

Sedimentation centrifuges Continuous nozzle Botch tubulor bowl Botch disc bowl Botch disc bowl, selt Opening... 

To recover liquid in order of preference of settlers, Section 5.8, thickeners. Section 5.10 and sedimentation centrifuges. Section 5.12 clarifier, settler, washing tray thickener, reactortubular bowl centrifuge, batch automatic (horizontal or vertical bowl, disc with intermittent nozzle discharge) continuous disc bowl centrifuge with nozzle discharge. 

In the clarification step of microbial suspensions, the tubular and disc centrifugal methods are often used. The tubular bowl centrifuge consists of a vertical cylinder, which rotates between 15 000 and 50 000 rpm, inside a stationary casting. The disc bowl centrifuge contains inverted cones or discs, which operate at 2000-7000 rpm. Due to the continuous and discontinuous operational behaviour of such centrifuges, the tubular centrifuge is applied to suspensions with a maximum of 30 g L of cells, while in the disc, suspensions up to 250 g can be processed. ... 

Figure 13.13 (a) Microbial aerosol produced by disc bowl centrifugation and subsequent removal of cell paste measured by the Cherwell SAS sampler (b) microbial aerosol produced by disc bowl centrifugation and subsequent removal cell paste measured by the Casell slit sampler operating over the same period as in Figure 13.13 (a). 

Surface (L ), population standard deviation, number of discs in stack in disc-bowl centrifuge Separation number Surface area of particle (L )... 

Disc stack centrifuge Scroil decanter centrifuge Single and multi- bowl basket centrifuges Tubular bowl centrifuge... 

Figure 1.13 Photograph (left) of an ejecting, self-cleaning, disc stack centrifuge showing an external view of the disc bowl and accompanying motor drive. Also shown (right) is a typical disc stack arrangement. Both photographs with permission from Alfa Laval.

Disc stack centrifuges, tubular bowl centrifuges, filtration centrifuges Alfa Laval company also has Thermal and Plow divisions Other company connections... 

Tubular bowl centrifuges usually incorporate continuous centrate discharge and batch solids recovery, and operate at variable speeds up to 20,000 G. Although primarily intended for liquid-liquid separation, they can also be used for recovery or classification of ultra-fine solids. These sedimenting centrifuges (disc, decanter and tubular bowl) are described further in Section 7. 

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