An incineration process is routinely used in Japan to treat nearly all
the generated sewage sludge. The drying process now is recognized to
play an important role as a pretreatment process of a incineration pro
cess. This paper provides a brief introduction to the conventionally u
tilized drying methods/equipment (i.e, hot gas drying, fluidized bed d
rying, pneumatic conveyor drying, and steam drying) for treating dewat
ered sludge cakes.