PURPOSE: To treat excretion so as to conform with a limited space of a small-sized ship by a method wherein, in a titled apparatus of a small-sized ship, a slurry like treating liquid is heated by a rotary drum heater in a final treating stage to sterilize Escherichia or the like and dry said liquid simultaneously.

CONSTITUTION: The excretion exhausted from a stool 1 is introduced into a stirring chamber 2 to break solid components and the obtained slurry like excretion is introduced into a storage tank 6 through a drying chamber 4 in a hermetically closed vacuum condition. Herein, the slurry like excrement is adhered to a rotary drum heater 7 by the action of an idler drum 5 and the adhered slurry like excrement is dried by the heat imparted from an interior of a rotary drum heater 7, thereafer, scraped by a scraper 8 and exhausted out of a ship. Thereby, by heating a slurry like liquid to be treated by a drum heater 7, the sterilization of a Escherichia or the like and the drying can be simultaneously carried out.