Sludge dryer dry the sludge by heating power, the dried sludge is in pellet or powder, whose diameter is below 5mm. The dryer has a efficient heat sterilization as the activity of microorganism, whose water content is below 10%, is suppressed to prevent the sludge from being smelly. After drying, sludge contains 1400~1700 calories so that abundant creature and fiber in it could be used as fuel to kill the pathogens completed and decompose the poisoned organic remains. Finally, the reutilization of remains and cinders could prevent sludge landfill or other treatment ways from bringing secondary pollution.
