TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: A hydraulic cylinder (10) is installed on top of the trolley for allowing up-and-down movement of the electromagnet(s). A plunger (11) is installed at the lower end of the hydraulic cylinder for vertical movement and is equipped at its end with the electromagnet(s). An outward bent bar is formed at the lower end of the plunger. A distance sensor is installed at the lower surface of the trolley to measure the distance between the electromagnet and the livestock and foodstuff wastes. A lifting mechanism (105) comprising second hydraulic cylinder (151) and piston rod (152) is attached to one side of the trolley, and activates up-and-down movement of the piston. A supporting shaft (106) is assembled to the second cylinder for rotating motion. A rotating mechanism (107) formed by a motor is provided which rotates the supporting shaft. Unwanted substances eliminating tools (108) are attached to the supporting shaft to eliminate unwanted substances on top of the livestock and foodstuff wastes. The eliminating tools are formed in ratchet type; and comprises unwanted substance collecting tools formed on the edge of the blades jutting out to the rotating direction of the screw, and unwanted substance eliminating mechanism fixed on one inner wall of the fermentation vessel to declog the gathered unwanted substance. The unwanted substance eliminating mechanism comprises a brush formed in a radial type on the rotating shaft that is driven by a driving motor (6), and a detecting switch to start the operation of the driving motor by close contact of the screw blade to the brush. An air supply mechanism for supplying air out of the facility housing of the fermentation vessel is installed on the screw shaft. The air supply mechanism comprises an induction pipe through which air is forcibly supplied from a blower to the screw shaft. A discharging mechanism for discharging vapor during agitation of the livestock and foodstuff wastes is installed on the upper part of the screw shaft. The vapor discharging mechanism comprises an inducing unit that forms inlets of the vapor generated from the wastes, a discharger for discharging vapor induced to the inducing unit, and a discharge pipe through which the vapor induced by the discharger passes. A filtering mechanism for filtering the vapor is installed outside the fermentation vessel. The filtering mechanism comprises a filtering reservoir for diluting the discharged vapor. Pieces of cork, which are floated on the surface of water stored in the filter reservoir, supply oxygen to micro parasites inside the reservoir and prevent the coming out of stench arising in the reservoir.