Applications and Performance of Equipment

Data of commercially available sizes of filtration equipment, their typical applications, and specific performances are available only to a limited extent in the general literature, but more completely in 

Performance often is improved by appropriate pretreatment of the slurry with flocculants or other means. An operating practice that is finding increasing acceptance is the delaying of cake deposition by some mechanical means such as scraping, brushing, severe agitation, or vibration. In these ways most of the filtrate is 

The relative suitability of the common kinds of solid-liquid separation equipment is summarized in Table 11.3. Filtration is the most frequently used operation, but sedimentation as a method of pretreatment and centrifugation for difficulty filterable materials has many applications. Table 11.15 gives more detail about the kinds of filters appropriate to particular services. 

Representative commercial sizes of some types of pressure filters for operation in batch modes are reported in Table 11.11. Some of these data are quite old, and not all of the equipment is currently popular thus manufacturers should be consulted for the latest information. Commercially available size ranges of continuous belt, rotary drum, rotary disk, and horizontal rotary filters are listed in Table 11.12. For the most part these devices operate with vacua of 500 Torr or less. 

Clarification of a great variety of industrial liquids is accomplished on smaller scales than in tank clarifiers by application of cartridge filters some of these applications are listed in Table 11.10. 

Figuie 11.7. Two types of laboratory filter arrangements, (a) Vacuum test filter arrangement standard sizes are 0.1, 0.05, or 0.025 sqft (Dahlstrom and Silverblatt, 1977). (b) Laboratory pressure filter with a vertical filtering surface and a mechanical agitator mild air agitation may be preferred ( Bosley, 1977). 

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