Abstract: A separation device for a fluid purification device is provided, the separation device comprising: at least three concentric enclosures including an outermost enclosure and an innermost enclosure and defining at least two concentric cavities; a plurality of spiral-shaped channels formed in each of the at least two concentric cavities, so that fluid can flow through said plurality of spiral-shaped channels; a fluid inlet, for receiving fluid, located in an upper section of an outermost cavity among the at least two concentric cavities, the fluid inlet corresponding to a gas outlet; a solids outlet, for discharging solids comprised in the fluid, located in a lower section of the separation device; and a liquid outlet, for discharging liquid comprised in the fluid, located in an upper section of at least one inner cavity among the at least two concentric cavities.

Abstract: The invention provides an apparatus and method for purification of a fluid, the apparatus comprising: a vessel (1) for receiving, in operation, a filter bed (2) with granular filter material; a transport system (8) configured to, during operation, transport filter material from a cavity (5) underneath the filter bed (2) to a location (17) above the filter bed; a fluid inlet (14) for introducing fluid to be purified into the apparatus; a mixing section (3) adapted to, in operation, provide a mixture of fluid from the fluid inlet and granular filter material from the filter bed in a part of the vessel beneath the mixing section; and a plurality of gas lift injectors (4), wherein each gas lift injector (4) is configured to, in operation, transport the mixture of fluid from the fluid inlet (14) and granular filter material from the filter bed (2) to the cavity (5).

Abstract: The invention provides an apparatus and method for purification of a fluid, the apparatus comprising: a vessel (1) for receiving, in operation, a filter bed (2) with granular filter material; a transport system (8) configured to, during operation, transport filter material from a cavity (5) underneath the filter bed (2) to a location (17) above the filter bed; a fluid inlet (14) for introducing fluid to be purified into the apparatus; a mixing section (3) adapted to, in operation, provide a mixture of fluid from the fluid inlet and granular filter material from the filter bed in a part of the vessel beneath the mixing section; and a plurality of gas lift injectors (4), wherein each gas lift injector (4) is configured to, in operation, transport the mixture of fluid from the fluid inlet (14) and granular filter material from the filter bed (2) to the cavity (5).

Abstract: The invention provides a method for the filtration of a bioreactor liquid (10) from a bioreactor (1) with a cross-flow membrane module (20) comprising one or more membranes (40). The method comprises feeding part of the bioreactor liquid (10) to a liquid inlet (21) of the cross-flow membrane module (20), transporting the bioreactor liquid (10) through the cross-flow membrane module (20) in a cross-flow mode, and removing a retentate (12) from a liquid outlet (22) of the cross-flow membrane module (20). The cross-flow membrane module (20) is arranged to allow a liquid downward flow of the bioreactor liquid (10) through the cross-flow membrane module (20). The method further comprises providing the liquid downward flow and a downward gas flow of a gas (30) through the cross-flow membrane module (20). Fouling of the membranes is relatively good prevented or reduced in time. Further, the liquid flow may be reduced relative to conventional configurations.

Abstract: For the anaerobic fermentation of solid organic waste substances, solid waste is mixed with liquid material, particularly anaerobic slurry, and the temperature of the mixture is brought to a value between 25.degree. and 70.degree. C., preferably between 30.degree. and 40.degree. C. (mesophilic) and between 55.degree. and 65.degree. C. (thermophilic). By means of spontaneous rising of lightweight material and by means of flotation, a layer (10) of solid material floating on a methane-generating zone is formed from said mixture in a reactor. Said floating layer moves from a supply end (7) or a mixing section (2) to a discharge end (14) of the reactor, hydrolysis and acidification of solidorganic material taking place in the floating layer. The fermented floating layer is discharged via the discharge (14) end independent of the residence time of fluid and slurry in the methane-generating zone under the floating layer.