Abstract: A method for regenerating an activated charcoal filter for a spray paint booth exhaust which includes the following steps:a passing a first gas flow of uncontaminated inlet air through the filter;preheating the first gas flow;combining the preheated first gas flow with additional uncontaminated air to form a preheated second gas flow at a predetermined temperature for achieving substantially complete desorption of the activated charcoal filter;recirculating the preheated second gas flow through the filter for desorbing filtered contaminants into the second gas flow;conveying the second gas flow to a heat contributing heat exchanging point for further preheating;pyrolytically oxidizing the further reheated gas flow, at a preselected elevated temperature, thereby oxidizing substantially all of the suspended particles therein;passing a resulting oxidized flow, at elevated temperature, to the heat exchanging point for cooling the oxidized gas flow and contributing exchanged heat to the second gas flow to achieve

Abstract: In conjunction with an apparatus for seizing flat sheets on a stack of sheets arranged on a supply table (1), a sheet-separating device (10) is characterized by an air flow generator (15) and guide (A,B) designed to direct a turbulent air flow produced by the generator (15) on at least one side of the stack of sheets. The guide comprises a first tube (A) arranged so as to direct a flow of air produced by the generator (15) onto one side of the upper part of the stack of sheets (100) placed on the supply table (1) and a second tube (B) for directing an air flow produced by the generator (15) in the upper part of the free space (8) located under the sheet-seizing device (2).

Abstract: Effluents contaminated with NH.sub.4.sup.+ values, e.g., domestic sewage, are purified by aerobic biological nitrification within a bed of biomass granulates, e.g., a fluidized bed, such granulates comprising a nitrification effective amount of at least one nitrifying microorganism firmly adhered to support, preferably carbonate granules consumable thereby.

Abstract: A movable grill is mounted in a frame in such a way that the grill is capable of being moved a certain distance above a feed table towards an ejection point and a suction device is mounted above the section of the grill which moves towards the ejection point. An air-tight rear sealing skirt is suspended from the frame to enclose the space found between the afore-mentioned section of the grill and the top of a pile of sheets on the feed table; and a forward air-tight sealing skirt is suspended from the aforementioned section of the grill above the ejection point such that the vacuum created by the section means causes eddies of air around the edges of the pile of sheets in such a way that the top sheet of the pile of sheets is caused to vibrate and is drawn up to the section of the grill in order that the top sheet is moved with the grill towards the ejection point.

Abstract: Process for denitrifying subterranean waters to make them potable. The sub-soil is employed as an infiltration site. Wells (3,4), for example four in number, surround a catchment well (5). The wells (3,4) are filled with a mixture based on straw and marl, to permit the denitrification reaction by a heterotrophic route by virtue of the bacteria present in the sub-soil and particularly in the subterranean waters. The denitrified water arrives at the catchment site (5) where it is withdrawn for the distribution (at 7) and for injection (8,9) into the infiltration sites (3,4). A simple, effective and inexpensive process is thus available for making potable the waters from subterranean tables.