Environmental Engineering FOURTH EDITION

Reuse, Recycling, and Resource Recovery 277

Figure 14-3. Inside a vertical hammermill. The hammers have been worn down by
the shredding process. (Photo courtesy of W. A. Worrell.)

Equation (14.1) may also be expressed as

1

1-Y

In - = (t)’,

so that a plot like that of Fig. 14-4 may be made using log-log coordinates. Often,

shredder performance is specified on the basis of “90% of the particles (by weight) pass-

ing a given size.” The conversion from characteristic size to 90% passing is possible

by recognizing that

(14.2)