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78 Wastewater Solids Incineration Systems
FIGURE 5.11 A typical cross-section of an MHF (WEF, 1992).
hearth as the arm rotates above each hearth. The cake typically is fed to the feed
hearth, and it is raked either toward the center or toward the periphery, where the
cake drops to the hearth below. When the cake is raked toward the center, the hearth
is referred to as an in-hearth. When the cake is raked outward to holes in the
periphery, the hearth is referred to as an out-hearth. The bottom hearth is always an
out-hearth to facilitate removal of bottom ash from the periphery. The alternating
drop hole locations on each hearth and the countercurrent flow of rising exhaust
