Concentrator and feeder of sludge for system to recover resources from sludge

摘要

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.