Abstract: A fluid treatment device is disclosed, including a sludge separator. The separator includes an inner funnel and an outer funnel, arranged with an intermediate, at least partial, gap between the funnels. According to another aspect, a fluid filtering device includes a filter portion containing a filtering material, a fluid inlet and a fluid outlet. The inlet is in the upper part of the device and the outlet is in the lower part of the device. Aeration nozzles are arranged in the device between the inlet and the outlet at a distance from the inlet and the outlet, respectively, enabling the creation of a vertical division of the filter portion into an aerobe section and an anaerobe section. A method is disclosed for filtering a fluid is also disclosed, as well as a method for regenerating a filtering device.

Abstract: The invention relates to an apparatus for separating impurities from waste water. The apparatus comprises a separating portion (40) for separating solid impurities from the waste water, a water storage tank (10) for storing at least partly purified waste water, a collecting vessel (20) for collecting the separated solid impurities, and a conveyor (30) which extends from the separating portion (40) to the collecting vessel (20), the separating portion (40) comprising an inlet (41a) through which waste water is passed to the separation apparatus, a water outlet (44) for removing water, which is connected to the water storage tank (10), and an impurity outlet (43) for removing the solid impurities, which is connected to the collecting vessel (20). Moreover, the invention concerns a method for separating impurities from waste water.