NOVELTY - High water content waste treatment equipment has reactor (I) and (II) having hydrothermal reaction portion to which high water content waste material and water vapor are supplied, respectively, mechanical water-removal device (4) in which slurry of high water content waste material obtained by hydrothermal treatment of reactor is supplied, and carries out mechanical dehydration of the slurry and exhaust-steam transfer unit to supply exhaust steam to reactor (II) as water vapor for reaction-zone pre-heating after hydrothermal treatment of reactor (I).    USE - Apparatus for treating high water content waste material.    ADVANTAGE - The high water content waste treatment equipment is simple and efficiently suppresses heat energy generated in the water-heat-treatment process of waste material.    DETAILED DESCRIPTION - High water content waste treatment equipment has reactor (I) and (II) having hydrothermal reaction portion to which high water content waste material and water vapor are supplied, respectively, mechanical water-removal device in which the slurry of high water content waste material obtained by hydrothermal treatment of the reactor is supplied, and carries out mechanical dehydration of the slurry and exhaust-steam transfer unit to supply exhaust steam of the reactor (I) to reactor (II) as water vapor for reaction-zone pre-heating after hydrothermal treatment of reactor (I), and before the hydrothermal treatment start of the reactor (II). The high water content waste material is stirred by the reaction zone, and advances hydrothermal reaction in the presence of water vapor using the reactors. Hydrothermal treatment and mechanical dehydration are used together, and high water content waste material such as dewatered sludge is spin-dried which reproduces to solid fuel of higher heating value. An INDEPENDENT CLAIM is included for high water content waste material processing method, which supplies waste material and water vapor to reactor (I), subjecting waste material to hydrothermal reaction in presence of the water vapor, supplied to reacted (II), exhaust gas of reactor (I) is supplied to reactor to (II) and steam in the high water content waste material.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the water-heat-treatment apparatus. (Drawing includes non-English language text)    Raw material supply tank (1)    Water-heat-treatment apparatus (2)    Intermediate tank (3)    Mechanical water-removal device (4)    Exhaust-steam condenser (7)