Patent DE-102007030927-A1 (DE)
Title: Method for sludge-disposal of small sewage purification plants, comprises sucking out, pumping out and/or withdrawing out bottom sludge and/or floating sludge from the purification plant and then filling the sludge in a dewatering device
Inventor: POEHNL ROLAND
IPC: C02F11/131
Filed: 2007-07-03
Abstract: The method for sludge-disposal of small sewage purification plants, comprises sucking out, pumping out and/or withdrawing out the bottom sludge and/or floating sludge from the purification plant with a sucking-, a pumping device and/or scoops and then filling the sludge in a dewatering device, dewatering the sludge in the dewatering device by centrifugation and/or pressing the sludge and then producing a water predominantly consisting of liquid constituents and a dewatered thickened sludge, and returning the liquid component in the purification plant by a returning device. The method for sludge-disposal of small sewage purification plants, comprises sucking out, pumping out and/or withdrawing out the bottom sludge and/or floating sludge from the purification plant with a sucking-, a pumping device and/or scoops and then filling the sludge in a dewatering device, dewatering the sludge in the dewatering device by centrifugation and/or pressing the sludge and then producing a water predominantly consisting of liquid constituents and a dewatered thickened sludge, returning the liquid component in the purification plant by a returning device connected at the dewatering device, and collecting and/or storing the thickened sludge in a collection- and/or transport container for receiving the thickened sludge and then transporting. The collection- and/or transport container are connected at the dewatering device, integrated in the dewatering device or placed in the dewatering device. The purification plant is started with maintenance- and/or disposal vehicle, which are equipped with a movable sludge-disposal device. The sucking device and/or the pumping device of the sludge-disposal device are connected to the purification plant over a hose and/or pipe. The returning device for returning the liquid component in the purification plant comprises the hose and the pipe and is connected to the purification plant. The thickened sludge is supplied to a solar-drying process. The container has a cover with rubber seal, closure locking for air-tight sealing, wheels, rollers for simple handling and/or loop for mounting a transport lock. The solar-drying process takes place in a movable solar-drying container, which has a glass cover and/or a Plexiglass(RTM: Methacrylates) cover. The solar-drying container has double-walled and/or horizontally arranged metal floors for receiving the thickened sludge. The thickened sludge is initially given on a first metal floor for drying process and then conveyed to a second metal floor or a container base below the first metal floor after a given time and/or after reaching a given drying degree by shaking or by a scraper. The sludge is automatically turned during conveying. A further metal floor is arranged below the second metal floor. The sludge is conveyed from an overhead metal floor to the metal floor or the container base arranged under it. The sheet metal floor is double-walled with an internal cavity and/or a tubing system, which is flowed by hot water and/or is filled with hot water for supplying additional drying heat. Water heating is carried out by solar cells arranged and/or attached to an external container wall. The solar-dried sludge is supplied to a movable composter for rotting. The sludge is step-wisely filled into the composter. The solar-dried and/or rotted sludge is granulated and/or volume-reduced by baling press and/or briquette press. The solar-dried, rotted, volume-reduced and/or granulated sludge is guided to thermal utilization or is used as fertilizer. The process is modularly developed, and forms a first process module, a second process module for transporting the thickened sludge, a third process module for solar-drying the thickened sludge, a fourth process module for rotting the sludge, a fifth process module for granulating and/or volume-reducing the sludge, a sixth process module for thermal utilization and a seventh process module for utilizing as fertilizer. The individual process modules are co-ordinated to each other, so that the modules from the second module up to the seventh module are applied additively to the first module. Independent claims are included for: (1) a device for solar-drying thickened sewage sludge; and (2) a device for sludge-disposal of small sewage purification plants.