A method for the continuous drying of wet organic wastes, in particular dehydration, by means of aerobic occurring post design, as well as a device for carrying out the method

摘要

1,253,854. Drying organic waste. H. GUJER. 2 Dec., 1968 [4 Dec., 1967], No. 57055/68. Heading F4G. [Also in Division C1] A process for continously drying organic waste to a water content suitable for a subsequent main composting step, comprises feeding the wet organic waste into bed of organic waste undergoing a preliminary aerobic decomposition which provides heat for the drying, the waste being fed to the bed in a quantity not greater than 20% by wt. of the bed mass per day, turning over the waste in the bed several times daily, and discharging dried waste from the bed at the same rate as it is fed thereto. The dried waste may be fed directly to a main composting stage. The waste may be subjected to an additional preliminary aerobic drying step prior to being fed to the bed. The waste may be sewage sludge or domestic refuse. Carbon, waste paper, wood, straw or peat may be mixed with the waste to improve the drying process. In one embodiment (Fig. 1) a suitable apparatus for drying the waste comprises a rotating annular container 1. A feed device 5 comprising belt 6 and breaker 7, feeds the waste in finely divided form to the container 1. Device 4 which comprises an endless belt having tines thereon, turns over the waste. The device 4 is mounted at an angle to a radius of the container 1 so that the waste is moved towards the external zone of the container. Screw conveyer 9 returns material from the outer zone to the internal zone. Device 10 removes dried waste from the container, this waste being screened at 11 and the material held on the screen being returned to the feed device 5 and the rest of the waste being discharged by conveyer belt 12. The feed device may comprise drying means. In another embodiment (not shown) the container is fixed and the devices 4, 5 and 9 are rotated. The dried material is discharged from the outer zones of the container by wiper blades into another annular zone for further treatment.