Questions For Thinking And Discussing

The following are some challenging calculations you can try for sizing cartridge filters. The design formulae provided in Chapter 5 should get you through these. Remember, the principles for the preliminary sizing of filtering machines are essentially the same. Once the primary sizing criteria have been established, then the detailed configuration and specific operational requirements can be established

1. A saturated liquor is thickened in a cartridge filter at maximum capacity and constant pressure drop. The properties of the suspension and the cake were determined from pilot scale tests as follows:

Solids concentration after thickening 3,510 N/m3

And the unit will be operated under the following set of conditions:

Ratio of filtration time to total thickness cycle 0.99 Using the above information, determine the following sizing information:

(a) the capacity of the thickener in the filtrate and the thickened suspension;

(b) the thickening cycle time that corresponds to the minimum filtering area;

(c) the minium filtration area required; and

(d) the cake thickness.

2. In the above design case, explain why each of the parameters calculated is important not only from an operational standpoint, but from selecting a specific cartridge filter. Then go to the Web and identify one ore more vendors that have machines you feel might be applicable to this case.

3. There are a lot variations of cartridge filters. This chapter only provides the basics. Take some time to develop a list of vendors and the different types of cartridge filters on the market today. Organize the list into batch and continuous type devices.

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