Abstract: A dewatering device for batchwise separation of liquid from particle-laden sludge, the dewatering device comprises a closed, downwards openable container having at least one liquid-pervious wall, the container being arranged to be filled with said sludge during a filling phase, a bladder located centrally inside the container, the bladder is adapted to be filled with a fluid, and a valve system for controlling the pressure of the fluid inside the bladder, wherein compression of the bladder is prevented by having the valve system adapted to maintain an overpressure of the fluid inside the bladder, in relation to the surrounding pressure, in use of the dewatering device during said filling phase. Further present invention relates to a method for separation of liquid from particle-laden sludge using a dewatering device which comprises a container, and a bladder located centrally inside the container.

Abstract: The present invention relates to a rotary piston engine to be used as a pump or an engine, comprising a housing (1) fitted with end walls (8, 9), a rotary body (2) rotatably mounted in said housing, and at least one sealing element (7) separating a volume formed between the housing (1) and the rotary body (2), said housing having at least one pair of inlet and outlet openings and the sealing element (7) having two legs portions, the ends of which abut against the rotary body (2), and a web portion intermediate said leg portions, said sealing element additionally being pivotable about a pivot axis on said web portion. The sealing element is movably associated with the housing in such a manner that the sealing element is displaceable radially, thus allowing the sum of the distances from the axis of rotation of the rotary body to the points of abutment on said body to vary.

Abstract: Device for the separation of substances contained in a liquid, when such substances exhibit a density, which is close to the density of the liquid, the device preferably being used for the extraction of fat and protein matters from process water in the food industry.By in vertical direction accelerating and the flow of a liquid containing particles with higher or lower density than the liquid, in which the particles are suspended, and at the same time change the direction of flow, particles heavier than the suspending liquid can settle on the bottom of a vessel (1), from where they can be drawn off, and particles lighter than the suspending liquid are collected on the surface, from where they can be removed by for example skimming.The acceleration and retardation are brought about by changes of areas in a vessel with a guided flow and where the direction of flow, which is substantially vertical, is turned by about 180.degree. at several occasions.

Abstract: A rotary drum vacuum filter separator for treating suspensions such as waste water from households or industry. The separator comprises a pair of cooperating counter-rotating drums, of which at least one is a filter drum, in which stationary shield walls define sections of different air pressure.