Abstract: The purpose of this study is to clarify the effluent of wastewater from domestic wastewater and food wastewater by separating wastewater generated from food wastes or domestic animal wastes into water and sludge. Livestock wastewater treatment system and food wastewater treatment system for separating livestock wastewater and food wastewater into water and sludge were produced. The configuration of the device comprises an outer member having a cylindrical shaped and networked transfer portion, an inner member having a plurality of rotating blades arranged along a circumferential direction of the rotatable body portion rotatably disposed within the outer member. A water inlet for airtightly housing the member and the outer member and a rotating body protruding in the radial direction from the outer circumferential surface of the rotating member. Waste water is supplied between the inner member and the outer member. There is provided a sludge discharge port through which the sludge separated from the wastewater is discharged and internal rotation means for rotating the internal member with respect to the housing. We could handle more than 10 ton/h. After solid-liquid separation, the water content of solid contents was 76% for food waste and 70% for sewage sludge. After solid-liquid separation, solid component removal rate of liquid component was 40% for food wastes and 60% for sewage sludge when 0.3 mm mesh was used. The solid component removal rate of liquid component after solid-liquid separation was 32% for food wastes and 42% for sewage sludge when 0.5 mm mesh was used. The separation net size was 0.5 and 0.3 mm and clogging did not occur in this case. The solid and liquid components obtained by solid-liquid separation were not discarded but used as compost or liquid fertilizer. Also, this device can be applied to conservation of the marine environment such as disposal of garbage by dried laver.