In some ways this chapter is a sidebar discussion, although it would be remiss to treat these systems as miscellaneous. Cartridge filters are so widely used throughout the chemical process industries that, if you are a chemical engineer, it would be amazing that at some point in your career you did not specify or use this type of filter in an application. The other types of filter machines discussed in this chapter are important, but perhaps are not nearly as frequently employed in process and water treatment applications as the cartridge device. In all cases the systems are operated as batch, although there are semi-continuous to continuous operations cropping up all the time.
As with other chapters, you will find a section at the end dealing with Questions for Thinking and Discussing. Some of the questions are problem-solving and rely on formulae and reference material provided to you in the last chapter. Remember to refer to the Glossary at the end of the book, if you run across any terms that are unfamiliar to you.
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