Abstract: To provide a process for treating gas for decomposing organic solvent and/or other organic gas contained in exhaust gas effectively and simply at low costs to remove the decomposition product of organic gas by applying other process. The gas can be treated very effectively by decomposing or removing a target gas component dissolved in liquid capable of treating the gas, preferably, by applying microbial treatment, after bringing the gas rising into contact with the liquid falling in a gas treatment tower wherein part of the gas (branched gas ) is admixed with the liquid before feeding the liquid into the tower.

Abstract: The emissions of hydrogen sulfide during the production of natural gas, oil or geothermal fluids from subterranean formations and the subsequent processing of these fluids is reduced by converting the hydrogen sulfide into a hydrogen halide or a halogen acid and then using the hydrogen halide or halogen acid for scale control and/or well acidizing. In a preferred embodiment, hydrogen sulfide produced with geothermal fluids is converted into hydrochloric acid, which is then used to reduce pH and control scale formation during the extraction of energy from geothermal fluids in a geothermal power plant.

Abstract: A pollution control system having a blower located in a reduced temperature zone is disclosed. In one embodiment, the system comprises: an injection grid, a vaporizer, and a blower. The injection grid injects ammonia vapor into a flue gas stream. The ammonia vapor is created as the vaporizer vaporizes aqueous ammonia into a carrier medium. Advantageously, the vaporization of the aqueous ammonia reduces the temperature of the carrier medium. A blower moves the carrier medium flow through the vaporizer and into the injection grid. The blower is located downstream of the vaporizer and upstream of the injection grid. This location permits the blower to operate in an environment with a substantially reduced temperature relative to the prior art. This advantageously increases the reliability of the blower and reduces installation and maintenance costs.

Abstract: A method and apparatus are described for dispersing an air modifying agent (e.g. a fragrance) in air. The air modifying agent and an electrolyte are entrained in a gel-based aqueous reservoir (7), which contacts a pair of electrodes (8, 9) which are +ve and −ve with respect to each other to provide an electrical potential between the electrodes. The electrical potential powers a small motor and fan (13, 14) which disperse the air modifying agent from the surface of the reservoir (7) to the surrounding atmosphere via apertures (16) in a housing (10) of the apparatus. The electrical potential can power additional or alternative electrical devices such as lighting and heating devices, and the arrangement may be such that the extent of exhaustion of the air modifying agent from the reservoir (7) corresponds generally to the extent of exhaustion of electrode (8, 9) activity, whereby the operability of the electrical device indicates the presence of air modifying agent in the reservoir (7).

Abstract: A method of enhancing oxidation of air contaminants on an ultra-low density, UV light accessible aerogel photocatalyst is provided. The method includes the steps of providing a photocatalytic reactor system broadly comprising a photocatalytic reactor cell, a UV light source, and a pump to force the contaminated air stream through the photocatalytic reactor cell. The photocatalytic reactor cell includes glass cell. A catalyst bed formed of a titanium dioxide aerogel is provided in the glass cell whereby a high fraction of the titanium dioxide aerogel is accessible to UV light and gas. The catalyst bed is exposed to UV light from the UV light source and a contaminated air stream is introduced into the photocatalytic reactor cell such that the air stream passes through the catalyst bed causing oxidation of the contaminants of the air stream.

Abstract: The invention relates to a heat treatment process for disinfection of seeds from pathogens and other undesirable fungi and bacteria, the process being characterized by supply to the seeds non water-borne heat while regulating the treatment time and temperature with regard to the condition and moisture content of the seeds in such a way that the seeds are heated from outside and in, while evaporation of moisture from the surface of the seed, and owing to that, cooling of the same is prevented and no changes in the moisture content occur.

Abstract: A regimen for hunting includes using a number of activated carbon-containing personal items in connection with a hunter's apparel and body to reduce the hunter's scent for improved hunting. The personal items include mouthwash, deodorant/anti-perspirant, body and boot powder, bar and liquid soap for cleansing the body and hair, laundry detergent and dryer sheets. Each of the personal items includes an effective amount of activated carbon, so that use of the personal items reduces the available scent to be detected by animals in the wild.

Abstract: An apparatus for the remote or local delivery of stored or real-time aroma sensory information to an end user of a multimedia device. The present invention includes an aroma converter for encoding aroma information into electrical signals, a delivery system for delivering the electrical signals, and a retrieval system for receiving and processing the electrical signals to control the aroma or combination of aromas emitted by one or more aroma release chambers.

Abstract: A method of using an air enhancing disc and a hair dryer. The hair dryer has a cold air inlet and an air outlet. In one embodiment, the air enhancing disc has a plurality of holes for allowing passage of air therethrough. The air enhancing disc has a first surface and a second surface. The air enhancing disc is releasably engaged to an outer surface of the cold air inlet. Air is allowed through the plurality of holes and through the cold air inlet. A stream of enhanced air is released from the air outlet of the hair dryer. The air enhancing disc may include perfume, cologne, scents, deodorant, or combinations thereof. Alternatively, the air enhancing disc may include vitamins or materials adapted to assist in stimulating growth or regeneration of hair.

Abstract: A cell culture incubator comprising a chamber, an airflow passage through which fluids may recirculate through the chamber, a filter disposed within the airflow passage, and a structural component constructed of a material with anti-microbial properties. The structural component is disposed in the airflow passage so that microbial contaminants in air flowing into or within the incubator will contact the anti-microbial structural component and be retained in a portion of the airflow passage. The portion of the airflow passage in which the microbial contaminants are retained may be adjacent to the structural element.

Abstract: A treatment apparatus for treating a substrate in an isolated treatment space in an air-conditioned clean room, comprising a removing unit including a plurality of removing sections for recovering at least some of air in the treatment space and removing impurities from the recovered air, the removing sections being arranged in series and each including a supply mechanism for supplying an impurity remover capable of removing the impurities by touching the recovered air, a temperature adjustment unit for adjusting the temperature of the air cleared of the impurities by the removing unit, and a return circuit for returning the air, adjusted in temperature by the temperature adjustment unit, to the treatment space.

Abstract: A germicidal method and apparatus for destroying airborne pathogenic bacteria such as tuberculosis bacteria using ultraviolet light. Air is drawn through a filter and into a sterilization chamber that is irradiated with ultraviolet light, and out through an exhaust opening. Consideration for the characteristics of the room in which the apparatus is installed and the positioning of the installation allows effective prevention of transmission of disease through expectoration and inhalation of airborne microdroplets of bacteria-containing sputum. The filter is of the low-density type which traps large particulates, but not small particulates of the size of the microdroplets, so that the filter does not become a bacteria colonization site. Baffles on the air intake opening and air exhaust opening to prevent ultraviolet light from escaping into the environment. The sterilization chamber is constructed such that the air passes the ultraviolet light bulbs twice as it circulates therethrough.

Abstract: A process and apparatus for incinerating certain volatile organic compounds especially odorants commonly used in the natural gas industry. The procedure uses a first (car bottom) furnace as a heating chamber, where precise temperature control during both low and high temperature process stages ensures safe and controlled feed of volatile substances into a second (primary) furnace for incineration. The combustion process is completed in an afterburner and all generated gases are scrubbed in a conventional wet scrubber.

Abstract: The present invention relates to a process for gas adsorption, in particular of acidic gases, using monodisperse aminomethylated bead polymers.

Abstract: An artificial flower arrangement that includes a number of lights and also includes a scent generating mechanism for dispensing a scent into the room. The scent generating mechanism is a plug in air freshener. Each of the light bulbs is positioned in the center of the corolla of an artificial flower.

Abstract: Method and system for generating chlorine dioxide gas in a controlled release manner by combining at least one metal chlorite and a solid material that reacts with the metal chlorite in the presence of water vapor, but does not react with the metal chlorite in the substantial absence of liquid water or water vapor to produce chlorine dioxide gas in a sustained amount of from about 0.025 to 1,000 ppm.

Abstract: An apparatus for use with a sewage pumper truck to muffle and deodorize an air stream generated by filling of a tank of the truck though action of a vacuum pump on the exhaust of the tank to evacuate the tank and suck waste material into the tank. A reservoir contains a deodorizing liquid having a liquid surface and has a reservoir inlet positioned above the liquid surface and connectible to the outlet of the vacuum pump, and a reservoir outlet. An exhaust stack is connected to the outlet of the reservoir. Outside air heated by ordinary action of the vacuum pump pulling through the tank, is passed through the reservoir over the liquid surface of the deodorizing liquid, evaporates a sufficient amount of the liquid to achieve the desired effect, and then leaves the reservoir and is blown out the exhaust pipe containing the evaporated liquid.

Abstract: A photocatalyst with visible light activity in which TiC is supported at least partially on a surface of TiO2 is claimed. This is obtained by subjecting TiO2 to a CVD treatment in a plasma with a mixed gas of hydrocarbon and methane. A method for decomposing material wherein a material to be decomposed such as formaldehyde is made in contact with the above-mentioned catalyst to which light including at least visible ray is radiated. According to the present invention, a photocatalyst with visible light activity capable of making harmless organic compounds such as formaldehyde, a method for making harmless organic compounds such as formaldehyde by the use of the photocatalyst and a method for photo-decomposition of organic compounds such as tar are provided.

Abstract: A salt sculpture air freshener is formed of a sodium chloride material, such as halite, formed into a sculpted shape and having a coated material thereover. It is mounted to a base having an electrical heater, such as an electric lamp, mounted therein for heating the coated salt material. The salt material may have a light tunnel therethrough for passing the heat and light from the electric heater so that the coated material is heated to reduce airborne microbiological agents adjacent thereto and to freshen the air therearound. The process of making an air freshener includes forming the salt material into a sculpted shape, selecting and coating the formed salt material with a coating material having bactericidal properties, mounting the coated salt material to a base having a heater therein, and heating the salt material to reduce airborne microbiological agents adjacent thereto and to freshen the air therearound.

Abstract: An apparatus for the remote or local delivery of stored or real-time aroma sensory information to an end user of a multimedia device. The present invention includes an aroma converter for encoding aroma information into electrical signals, a delivery system for delivering the electrical signals, and a retrieval system for receiving and processing the electrical signals to control the aroma or combination of aromas emitted by one or more aroma release chambers.

Abstract: A fragrance dispenser for use with a light bulb and fragrance medium that emits a fragrance when heated. The fragrance dispenser includes a body member having an opening for receiving a portion of a light bulb and having a cavity for holding a fragrance medium so that when the fragrance medium is held in the cavity, the light bulb is energized, and at least a portion of the light bulb is received in the opening the body member, heat from the light bulb will be transferred through at least a portion of the body member to the fragrance medium held in the cavity in the body member to cause the fragrance medium to emit a fragrance. The fragrance dispenser additionally includes control structure for controlling the emissions of fragrance from the fragrance medium held in the cavity in the body member.

Abstract: The present invention provides a means and a device to control relative humidity and airborne contaminants within a defined environment. The devices and methods of the present invention enable a user to regulate the relative humidity of a defined environment and insure that extreme conditions, e.g. less than 15% or greater than 90% relative humidity, do not exist. The air quality control system can also be used to control the relative humidity in and about a narrow range. Control over relative humidity and airborne contaminants is achieved by combining an appropriate salt and water solution, such as a saturated salt solution with a solid phase of that salt, with an isolation membrane and a getter system. The present invention is particularly useful for housing sensors, such as SIR sensors, which are sensitive to relative humidity extremes.

Abstract: A garbage disposal apparatus having a processing chamber for processing garbage; and a purifying chamber for purifying gas discharged from the processing chamber and containing malodrous components, wherein the processing of garbage in the processing chamber is performed by decomposition using microorganisms. The purifying chamber has a plurality of zones, wherein a first purifying chamber is connected to the processing chamber and is provided with an ammonia purifying unit for purifying ammonia, and a second purifying chamber into which gas allowed to pass through the first purifying chamber is introduced is provided with a non-ammonia purifying unit for purifying non-ammonia gas. Ammonia contained in a high concentration and having a large threshold is first removed in the first purifying chamber. Then, non-ammonia contained at a low concentration and having a small threshold is removed. Therefore, an excellent purifying efficiency can be realized.

Abstract: The need to filter gas emanating from a containment vessel is reduced or eliminated by maintaining, within the vessel, a gradient that concentrates most of the gaseous contaminants away from the vessel exits. This is achieved by reducing the density of gas drawn from the region near its source and discharging the reduced-density gas to another region of the vessel. Owing to its reduced density, the discharged gas already has a lower contaminant concentration than the source gas. The concentration decreases further as convection draws the discharged gas back to its source. So long as the gas flows within the containment vessel are non-turbulent, the concentration gradient remains substantially static, and the vents remain exposed only to low concentrations of contaminants. The gas density may be reduced by heating and humidification, catalytic reaction, or reaction among constituents of the gas.

Abstract: An apparatus for the remote or local delivery of stored or real-time aroma sensory information to an end user of a multimedia device. The present invention includes an aroma converter for encoding aroma information into electrical signals, a delivery system for delivering the electrical signals, and a retrieval system for receiving and processing the electrical signals to control the aroma or combination of aromas emitted by one or more aroma release chambers.

Abstract: A garbage processor has a vessel for receiving garbage, a rotary pulverizer/stirrer for crushing and stirring the garbage in the vessel and a first heater for drying the garbage in the vessel. A steam is generated upon heating and drying of the garbage. An air blower feeds a high pressure an ambient air into the vessel to force the steam out of the vessel. A steam separator is provided for separating the steam into a water and a gas. A second heater is provided downstream of the steam separator for oxidizing the gas emanating from the steam separator to reduce a smell of the gas. The gas is deodorized before it is discharged to the atmosphere.

Abstract: A room air freshener adapted to be used in connection with a register vent. The structure of the freshener is especially formed to be attached to the vent register and includes a formed handle adapted to keep the freshener material adjacent to the grid of the register vent. A certain range in the amount of mass of the freshener is required for a certain volume of air for best operation of the freshener.

Abstract: A main steam pressure disturbance preventing apparatus of a nuclear power plant including, one of a pressure detector and a water level detector provided in one of a steam system from a reactor of the nuclear power plant and a drain system connected to the steam system, an instrumentation pipe connected between one of the pressure detector and the water level detector and one of the steam system and the drain system, and catalyst installed in one of the pressure detector, the water level detector and the instrumentation pipe for recombining hydrogen and oxygen.

Abstract: A method and device for the filtration and/or purification of fluids water or other solutions containing microbiological contaminants, such as fluids containing including bacteria and/or viruses, where the fluid water is passed through a purification material composed of apatite and absorption media in a fixed binder matrix.

Abstract: A method for producing chlorine dioxide by activating zeolite crystals (which have been impregnated with metal chlorite such as sodium chlorite, and optionally also a water-retaining substance such as magnesium sulfate, potassium chloride, potassium hydroxide, or calcium chloride) with excess protons, or activating an aqueous solution of metal chlorite and such a water-retaining substance with excess protons. Proton generating species useful for the activation are acids such as acetic, phosphoric, and citric acid, and metal salts such as ferric chloride, ferric sulfate, ZnSO4, ZnCl2, CoSO4, CoCl2, MnSO4, MnCl2, CuSO4, CuCl2, and MgSO4. The activation can be performed by causing fluid to flow through a bed of zeolite crystals impregnated with calcium chloride (or other water-retaining substance) and sodium chlorite, and a bed of zeolite crystals impregnated with a proton generating species.

Abstract: An air freshener composed of volatile substances having the appearance of a decorative snow globe. A method of making the air freshener is also disclosed.

Abstract: An ozone generator of the corona discharge type having a housing which is dimensioned to fit into one of a male end and female end of an air duct of a building and a glass tube of a radius substantially less than a width of the housing. An electrically conductive inner mesh is fitted over an interior surface of the glass tube and an electrically conductive outer mesh is fitted over an exterior surface of the glass tube. The ozone generator also has means for generating a high electric potential difference across the electrically conductive meshes.

Abstract: Method and apparatus for cleaning a gas for preventing the contamination of a surface of a substrate in a localized space are disclosed. A photocatalyst is provided in a selected area of the localized space and the photocatalyst, as it is illuminated with light, is contacted by the gas to be treated, whereby any noxious gases are removed from the treated gas. Alternatively, a unit apparatus composed of an ultraviolet radiation source, a photocatalyst, a photoelectron emitter and an electrode is installed in a selected area of the localized space and the gas to be treated is passed through the unit apparatus, whereby noxious gases and particulates are removed from the treated gas.

Abstract: The invention provides methods and apparatus for treating hazardous biological wastes. According to one exemplary method, a biological waste material is placed into a chamber and a vacuum is applied to the chamber. After the pressure within the chamber is sufficiently reduced, water vapor is introduced into the chamber and electromagnetic radiation energy is applied to produce a plasma. In one particularly preferable aspect, the chamber is allowed to reach a static condition before the water vapor is introduced. In this way, the water vapor is able to equally distribute itself throughout the volume of the chamber so that an equally distributed plasma can be produced upon application of the electromagnetic radiation energy.

Abstract: An ozone distribution system is herein described for an enclosed space defined within an enclosure having at least one vent through which gases can escape from the enclosed space.

Abstract: A method and apparatus for treating nuisance odor streams is provided. One embodiment of the invention is directed to a method and apparatus in which deodorizing chemical agents are applied to an evaporative reaction pack situated within a gas chamber having an air stream running therethrough. The evaporative reaction pack provides a reaction zone within which the chemical agent is evaporated to facilitate a gas--gas or vapor phase interaction between the chemical agent and odoriferous compounds contained in the air stream. Another aspect of the present invention relates to a method and apparatus for batch processing of sewage treatment agents within a wet well to prevent the formation of undesired compounds. In one embodiment, a predetermined amount of chemical agent, sufficient for treating the amount of sewage that the well can hold, is added to an evacuated wet well in coordination with the pumping of sewage from the wet well.

Abstract: Evaporation devices and associated methods for introducing humidity into an atmosphere. The evaporation device includes a substantially rigid shell encasing an absorbent material and having a plurality of holes extending therethrough to permit air flow between the exterior and interior of the shell. The absorbent material can be a natural or synthetic sponge capable of absorbing and retaining water. After applying water to the evaporation device, it is placed in an environment to which humidity is to be introduced. Evaporation of water can be enhanced by placing a mixture of aspirin and sodium bicarbonate on the absorbent material. Examples of methods for using the evaporation device include placing the evaporation device in produce bins, produce refrigerators, cheese and meat refrigerators, and containers of dry foods, such as cookies and brown sugar.

Abstract: The system for and a method of generating a scent and an image based upon a coded signal transmitted from a remote location, and the scent is generated from a dry scent carrying medium which contains a plurality of independent sources of scent causing agents. The coded signal is indicative of simultaneously activating the independent sources of scent causing agents so as to generated a complex mixture of the scents on the fly.

Abstract: The photocatalytic action of titanium dioxide and the anti-odor activity of undecylenic acid or its compounds are combined in an atmospheric scrubbing or renewal system. The invention consists in placing a filter impregnated with these two substances and exposed to a natural or artificial source of ultraviolet radiation in the path of the air.

Abstract: An air filtration device (1) comprising:a housing (3) having an air inlet (5) and an air outlet (7);air displacement means (9) for displacing air from the inlet (5) to the outlet (7) in a direction D through a filter element (11),the filter element (11) comprising at least one filter unit (13) comprising an absorbent, fibrous material which is impregnated with an aqueous solution of an acid or a base. In a particular embodiment, the filter element comprises two filter units (13,15) in series arrangement, one (15) of which is impregnated with an aqueous solution of an acid and the other (13) of which is impregnated with an aqueous solution of a base. If so desired, at least one filter unit (13,15) may be additionally impregnated with an alkali-metal humectant (such as potassium formate) and/or an organic amine compound selected from the group formed by urea and the alkanol amines (such as tris-hydroxymethylaminomethane). At least one filter unit may also be impregnated with a pH indicator substance.

Abstract: A garbage disposal apparatus having a processing chamber for processing garbage; and a purifying chamber for purifying gas discharged from the processing chamber and containing stinking components, wherein the process of garbage in the processing chamber is performed by decomposition using microorganisms, the purifying chamber has a plurality of zones, a first purifying chamber connected to the processing chamber is provided with an ammonia purifying unit for purifying ammonia and a second purifying chamber into which gas allowed to pass through the first purifying chamber is introduced is provided with a non-ammonia purifying unit for purifying non-ammonia gas. Ammonia contained in a high concentration and having a large threshold is first removed in the first purifying chamber. Then, non-ammonia contained at a low concentration and having a small threshold is removed. Therefore, an excellent purifying efficiency can be realized.

Abstract: A composition and method for disinfecting inanimate and dermal skin surfaces includes phenol, iodine solution, and glycerine and water. In a most preferred embodiment, the solution includes, by volume, between about 1/2 and about 1 volume units phenol, between about 1/2 and about 2 volume units of iodine solution, between about 2 and about 8 volume units of glycerine. A suitable diluent such as water or glycerine can also be used. The iodine solution is preferably a tincture of iodine solution having, by volume, between about 2% and 10% iodine in ethyl alcohol, and about 5% potassium iodide.

Abstract: An improved method for processing an industrial sterilization agent utilized to sterilize medical instruments includes the use of a regenerative thermal oxidizer. The sterilization agent is removed from the sterilization chamber and directed into the combustion chamber with little chance for the sterilization agent to mix with air or any other source of oxygen. In this way, the present invention reduces the possibility of explosion of the sterilization agent prior to its being directed into the combustion chamber.

Abstract: The present invention relates to single-phase soap gels and viscous soap compositions which are produced by alkanolamine neutralization of a fatty acid above the Krafft point. These compositions are robust, biodegradable, and are insensitive to temperature changes. The compositions also exhibit excellent cleaning properties and may be used as laundry cleaning agents, oven cleaners, hard surface cleaners, and disinfectants and air fragrancing compositions.

Abstract: A method for disinfecting an airstream containing microorganisms by electrostatic precipitation by passing the airstream through the space between at least one grounded collection plate having at least one electrode spaced apart therefrom connected to a source of electrical potential, wherein the improvement comprises contacting the airstream with a photocatalyst having a predetermined band gap energy coated on the surface of each grounded collection plate and illuminated with photons having a wavelength corresponding to the band gap energy of the photocatalyst, so that at least a portion of the microorganisms that collect on the grounded collection plate are destroyed by photocatalytic oxidation. Devices embodying disinfecting methods are also disclosed.

Abstract: A process and apparatus are provided for deodorizing malodorous solids, liquids, and/or gases by contacting them with a mist of an aqueous deodorizing solution consisting of an alkali metal or alkaline earth metal chlorite, buffering agent(s), water, and optionally an alkali metal or alkaline earth metal chlorate and/or an alkali metal alkaline earth metal chloride. The preferred alkali metal is sodium. The deodorizing solution contains available chlorine dioxide and has a pH of about 8.5-9.5. In the process a concentrated solution of the deodorizing solution is diluted and mixed with water and misted into or onto the substance(s) to be deodorized, for example, the sewer gases from a sewage lift station. The apparatus consists of a rotameter which measures the amount of the concentrated deodorizing solution introduced into an eductor for dilution in a passing water stream which is then transported to spray nozzles for misting the malodorous substance(s).

Abstract: A waste plastic disposal apparatus (K1-K4) including a storage portion (2) for storing waste plastic; a heating portion (7) for heating the waste plastic, which includes a heater (7b) and a fan (7a); a hot-air circulating path (20) for circulating hot air therethrough, which is defined by the storage portion (2) and the heating portion (7); an exhaust path (10) which branches off from the hot-air circulating path (20); and a deodorizing portion (9) which is provided in the exhaust path in response to intake of a predetermined quantity of external air into the hot-air circulating path (20) per unit time, the hot air in the hot-air circulating path (20) is exhausted in a quantity equal to the predetermined quantity from the exhaust path (10) through the deodorizing portion (9).

Abstract: A garbage processor has a vessel for receiving garbage, a rotary pulverizer/stirrer for crushing and stirring the garbage in the vessel and a first heater for drying the garbage in the vessel. Steam is generated upon heating and drying of the garbage. An air blower feeds high pressure ambient air into the vessel to force the steam out of the vessel. A steam separator is provided for separating the steam into water and a gas. A second heater is provided downstream of the steam separator for oxidizing the gas emanating from the steam separator to reduce the smell of the gas. The gas is deodorized before it is discharged to the atmosphere.

Abstract: A process and apparatus for the programmed scenting of environments, comprising the steps of piercing a capsule containing a fragrant substance and dispersing a sequence of the fragrances throughout the environment in synchronization with an event being held. The event can be any live, recorded, or pre-programmed performance, including motion pictures, television episodes, computer games, or stage plays. The fragrances dispersed into the environment derive from capsules of scenting substances and compounds embedded on a disk and pierced in synchronization with the actions, places, and motions being executed.

Abstract: The present invention relates to a filled paper for gas filtration, with a high adsorption and absorption capacity. This paper, consisting of cellulose fibers, is filled with organic and/or inorganic powders adapted in quantity and in quality to the gas to be treated.It finds its application in the petroleum, chemical, agri-foodstuffs and papermaking industries, in apartment buildings and in office and hospital buildings.