Abstract: The present invention concerns a method for treating solid waste with an organic fraction. A slurry (4) of the waste (1) diluted with water (3) is sieved, at least by means of a sieving device (5) which lets pieces through whose dimension in at least one direction, and preferably in at least two standing directions, is situated between 2 and 20 mm, after which, from the slurry (7) which has passed through, a part of the ferrous metals (8) which are present in the waste (1) is removed from said waste by means of magnets, and the slurry (7) is finally dewatered.

Abstract: The present invention concerns a method for treating solid waste with an organic fraction. A slurry (4) of the waste (1) diluted with water (3) is sieved, at least by means of a sieving device (5) which lets pieces through whose dimension in at least one direction, and preferably in at least two standing directions, is situated between 2 and 20 mm, after which, from the slurry (7) which has passed through, a part of the ferrous metals (8) which are present in the waste (1) is removed from said waste by means of magnets, and the slurry (7) is finally dewatered.

Abstract: Method for the anaerobic decomposition of degradable organic waste and for the extraction of biogas from the latter in a reactor (1), according to which method the waste is put in a reactor (1) which contains an active, anaerobic, methanogene biomass and which is exposed to anaerobic fermentation without any mixing in the reactor (1), characterized in that the waste is supplied in the shape of a semi-solid or solid organic substrate at the top of the reactor, in that a phase separation into a liquid phase (6) and a solid phase (4) is allowed in the lower part of the reactor, whereby at least during a fermentation period without any mixing in the reactor (1), a liquid phase (6) is secreted at the bottom in the reactor (1) from a top solid phase (4), in that this liquid phase (6) is removed before fresh substrate is supplied, whereby a maximum amount of solid phase (4), namely substrate and biomass, is retained, and in that, after the removal of the liquid phase (6), the solid phase (4) is removed from the reac

Abstract: A device for determining the aerobic biodegradability in a composting installation of at least one product includes at least two reactors, a temperature device for maintaining the reactors at a temperature above the ambient temperature, a device for passing gas which contains oxygen through the reactors, a device for separately collecting outflowing gas from each of the reactors, a measuring/calculating device for determining the amount of CO.sub.2 in the outflowing gas of each reactor and a calculating device for determining the aerobic biodegradability of the at least one product based on the measured/calculated amount of CO.sub.2 in the outflowing gas of each reactor.

Abstract: Method for determining in an accelerated manner the biodegradability of at least one product under anaerobic conditions which are similar to those in a dump, characterized in that a mixture with a dry substance content of between 25 and 50% is prepared with more than 80 weight-% of an active anaerobic inoculum and less than 20 weight-% of the product, on the one hand, at least one quantity of this mixture and, on the other hand, at least one quantity of the inoculum is subjected in the same manner to a fermentation at a temperature of between 30 and 60 degrees Centigrade in anaerobic conditions, the amount of biogas that is released with both these fermentations is separately measured or calculated, starting with these amounts the amount of biogas produced by the product alone is deduced and starting with the latter amount the degradability of the product itself is determined, this is the amount of carbon which was degraded from the product and converted into CO.sub.2 and CH.sub.4.

Abstract: A flat plate vessel comprising an extraction device having a sliding frame on the flat plate, the frame being associated at least with one upwardly open channel, which is parallel to the flat plate and is provided with a transport screw, in which the vessel is first of all closed by a cover having an opening communicating with an inlet duct for material to be subjected to anaerobic fermentation and an opening communicating with a discharge duct for gas produced during fermentation; secondly, at least one activating shaft for the sliding frame and the drive shafts for the transport screws are surrounded by sealing gland devices; and finally, the channels provided with transport screws end at at least one discharge channel, the cross-section of which reduces towards the outlet opening, and in which there is located a transport screw extending towards the outlet opening, without however reaching this opening, and this screw forms, in the region of the discharge channel the cross-section of which narrows, a plug

Abstract: In the process of treating organic materials comprising a preparation phase in which the organic material to be digested is mixed with an appropriate inoculant and introduced into an anaerobic digester (6), the organic materials are mixed with the inoculant in a mixer (3) in order to form a solid-appearing mass which is introduced into the digester (6) and is extracted thereform after a period of less than 50 days; a part equal to at least one-third of the material extracted from the digester (6) is recycled to the inlet and mixed by kneading with a quantity of fresh organic material less than twice the recycled quantity, the quantity of fresh organic material being pretreated as needed by a drying or by humidification in a manner such that the mass leaving the mixer (3) has a rate of humidity between about 55% and 75%.