This invention is a system for recovering resources from sludge in which sludge including water of 90 to 70 percent is first supplied to a sludge concentrator invented by the inventor through a forced supply equipment where the sludge is concentrated to have water content up to about 60 percent; then is sent to a drying furnace having a fluidized sand bed. A product yielded in the said drying furnace is separated to gas and solid. After the separated gas is pressurized by a fan and is heated by a heat exchanger through a circulation passage, a required part thereof is supplied to the drying furnace as gas for drying and the remainder is sent to the said sludge concentrator. After the water content is removed from the gas concentrated and the gas yielded by the said sludge concentrator is used in the system as gaseous fuel. Further, the solid separated is dried and distilled through a gasifying apparatus designed by the inventor to recover gaseous fuel, and in addition, the separated solid is fed into an ash disposal equipment designed by the inventor; the ash generated from the gasifying apparatus is also supplied to the said ash disposal equipment to allow the ash to be melted and then to allow the ash to be solidified in the ash disposal equipment to take out the solidified one as massive ashes; the exhaust gases from these gasifying apparatus and ash disposal equipment are supplied to the said heat exchanger.
Dec 21, 1981 [JP] 56-205251 Dec 21, 1981 [JP] 56-205252 Dec 21, 1981 [JP] 56-205253 Mar 23, 1982 [JP] 57-044553 Mar 23, 1982 [JP] 57-044554 May 25, 1982 [JP] 57-087296
A system for recovering resources from sludge in which sludge containing water in the amount of 90 to 70 percent is first supplied to a sludge concentrator through a forced supply equipment where the sludge is concentrated to contain a water content of a maximum of about 60 percent; then is sent to a drying furnace having a fluidized sand bed. The product obtained in the drying furnace is separated to gas and solid. After the separated gas is pressurized by a fan and is heated by a heat exchanger through a circulator passage, a portion thereof is supplied to the drying furnace as gas for drying and the remainder is sent to the sludge concentrator. The water content is then removed from the concentrated gas and the gas obtained from the sludge concentrator is used in the system as gaseous fuel. Further, the separated solid is dried and distilled through a special gasifying apparatus to recover gaseous fuel, and in addition, the separated solid is fed into ash disposal equipment; the ash generated from the gasifying apparatus is also supplied to the ash disposal equipment to allow the ash to be melted and then to allow the ash to be solidified in the ash disposal equipment and to take out the solidified massive ashes; the exhaust gases from the gasifying apparatus and ash disposal equipment are supplied to the said heat exchanger.
A concrete mortar is formed by mixing together sand, cement, water and a sewage sludge ash. A foam is added to the mortar to form a foamed concrete composition.
The present invention provides a method for processing wastes containing a large amount of water and a method for processing leachate from industrial wastes. Specifically, the present invention provides a method which comprises maintaining reduced pressure in the dryer equipped with a stirring means, feeding wastes containing a large amount of water to the dryer, stirring the wastes while blowing refrigerated air at -20.degree. C..+-.5.degree. C. to the dryer, and drying the frozen moisture portion of the wastes by sublimation. Air heated at 80.degree. C.+10.degree. C. can be used instead of refrigerated air to dry water of the wastes by evaporation. The present invention also provides a method for processing leachate which comprises pooling leachate industrial wastes and burned ashes, and utilizing the leachate to absorb wet-type toxic gas, thereby confining the leachate within the waste treatment plant. The present invention therefore make it possible to process wastes containing a large amount of water, which have been a problem in the incineration by the conventional methods, by using the potential heat of the waste gas from the incinerator. The present invention also provides an effective means to prevent environmental contamination because leachate is confined in the waste treatment plant.
The present invention provides a method for processing wastes containing a large amount of water and a method for processing leachate from industrial wastes. Specifically, the present invention provides a method which comprises maintaining reduced pressure in the dryer equipped with a stirring means, feeding wastes containing a large amount of water to the dryer, stirring the wastes while blowing refrigerated air at -20.degree. C..+-.5.degree. C. to the dryer, and drying the frozen moisture portion of the wastes by sublimation. Air heated at 80.degree. C.+10.degree. C. can be used instead of refrigerated air to dry water of the wastes by evaporation. The present invention also provides a method for processing leachate which comprises pooling leachate industrial wastes and burned ashes, and utilizing the leachate to absorb wet-type toxic gas, thereby confining the leachate within the waste treatment plant. The present invention therefore make it possible to process wastes containing a large amount of water, which have been a problem in the incineration by the conventional methods, by using the potentioal heat of the waste gas from the incinerater. The present invention also provides an effective means to prevent environmental contamination because leachate is confined in the waste treatment plant.
