Organic waste treatment system

Abstract

[Object] To provide an organic waste treatment system in which general wastes from home, ordinary offices, and the like as well as industrial wastes including sludge, waste plastics, and the like can be subjected to treatment such as decomposition by a hydrothermal reaction under a subcritical water condition and in which treated wastes can be taken out in a dried state, sorted, and recycled. [Approach] In a waste treatment system for hydrolyzing organic wastes while stirring the wastes under a high-temperature and high-pressure environment and thermally decomposing or carbonizing the wastes in a double-walled pressure-resistant container 1 , the system includes at least: water vapor supply means 9 a for supplying high-heat saturated water vapor into the container 1 ; pressure regulating means 10 for regulating pressure in the container 1 by using an on-off valve; and stirring means 6 having a shaft 7 for stirring the charged wastes in the container 1 and provided to penetrate the container 1 and the system includes the steps of: hydrolyzing the wastes while adjusting temperature to 230° C. or higher and pressure to 3 MPa in the container 1 and stirring the wastes and thermally decomposing or carbonizing the wastes; adjusting the pressure in the container 1 to atmospheric pressure or lower and discharging the treated wastes out of the container while maintaining a dried state of the wastes; and sorting the discharged treated wastes and forming at least one of fertilizer, feed, and auxiliary fuel depending on types of the wastes.

1 . An organic waste treatment system for hydrolyzing organic wastes while stirring the wastes under a high-temperature and high-pressure environment and thermally decomposing or carbonizing the wastes in a double-walled pressure-resistant container, wherein the system comprises at least: water vapor supply means for supplying high-heat saturated water vapor into the container; pressure regulating means for regulating pressure in the container by using an on-off valve; and stirring means having a shaft for stirring the charged wastes in the container and provided to penetrate the container and the system includes the steps of:
 hydrolyzing the wastes while adjusting temperature to 230° C. or higher and pressure to 3 MPa in the container and stirring the wastes and thermally decomposing or carbonizing the wastes;   adjusting the pressure in the container to atmospheric pressure or lower and discharging the treated wastes out of the container while maintaining a dried state of the wastes, and;   sorting the discharged treated wastes and forming at least one of fertilizer, feed, and auxiliary fuel depending on types of the wastes.   
   
   
       2 . The organic waste treatment system according to  claim 1  further comprising forcibly discharging means for forcibly discharging water vapor to discharge the water vapor generated in drying to an outside of the pressure-resistant container. 
   
   
       3 . The organic waste treatment system according to  claim 2 , wherein the discharged water vapor is used to operate a gas turbine to generate electricity by using the power. 
   
   
       4 . The organic waste treatment system of  claim 1 , wherein the dried state of the treated wastes is maintained by supplying high-heat water vapor into a clearance between an outer wall and an inner wall of the double wall of the pressure-resistant container and maintaining temperature at 160 to 180° C. and pressure at 1 MPa in the clearance. 
   
   
       5 . The organic waste treatment system of  claim 1 , wherein the organic wastes are at least one type of industrial wastes of sludge, waste plastics, wastepaper, wood waste, animal solid wastes, plant and animal residue, animal feces and urine, animal carcasses, and infectious specially-controlled industrial wastes. 
   
   
       6 . The organic waste treatment system of  claim 1 , wherein the organic wastes are at least one type of general wastes of general wastes from business activities, household wastes, infectious specially-controlled general wastes, separated garbage, and food residue. 
   
   
       7 . The organic waste treatment system of  claim 1 , wherein auxiliary fuel is formed as powder or pellets. 
   
   
       8 . The organic waste treatment system of  claim 1 , wherein incineration ash after use of the auxiliary fuel is molded by a molding device and used as structural materials.