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Municipal Solid Waste Processing; Materials Recovery Facilities 203

FIGURE 7.35 Air knife. (Pfeffer, J.T.,
Solid Waste Management Engineering,
Prentice Hall, Englewood Cliffs, NJ,
1992. Reproduced with kind permis-
sion of Pearson Education, Inc., Upper
Saddle River, NJ.)

FIGURE 7.36 Complete air classification system including cyclone. (Tchobanoglous, G. et al., Integrated
Solid Waste Management: Engineering Principles and Management Issues. McGraw-Hill, New York, 1993.
Data reproduced with kind permission of the McGraw-Hill Companies, Inc.)

of the chamber under the force of gravity. The air, free of solids, exits the unit. Some suggest that
a large fitter bag be installed which will capture particles while the exit air is filtered and escapes.
The air can be either pushed or pulled, and a fan can be placed either before or after the cyclone
(Vesilind et al., 2002).