Abstract: A Polyionic Molecular Diffuser and Filter Method. The device and method provides superlative filtration in macro, micro and nano ranges for a variety of fluids. The device utilizes filtration elements that are relatively low cost, yet provide the significant advantage of being able to be back-flushed periodically to remove captured solids. The device employs an arrangement of filter elements wherein the filtration axis of the filters is perpendicular to the flow axis of the collecting housing. The device and method further provides a way for adjusting filter to capture different sizes of solids, depending upon the particular user adjustment. This same filter is adaptable to operate as a gas diffuser that will diffuse gas into a liquid in a very controllable manner, while also purifying the diffused air.

Abstract: The present invention is a container having a diptube inlet, at least one baffle disc positioned between the outlet of the diptube and the outlet of the container to provide a narrow annular space between the baffle disc and the sidewall of the container to prevent liquid droplets from entering the outlet to the container and the inner surface of the container sidewall and an annular, radially inward projecting deflector ledge on the sidewall, proximate the baffle disc. The present invention is also a process of delivering a chemical precursor from a container having the above structure. Liquid and vapor delivery are both contemplated.

Abstract: An aeration system for treating liquid contained in a vessel is provided. The aeration system includes a header pipe and a plurality of lateral pipes coupled to the header pipe. The lateral pipes each have one or more tubular diffuser membranes sleeved therearound. Also provided is a coupling for sealingly joining end portions of two adjacent pipes is provided. The coupling includes two saddle sections and a deformable gasket extending between the pipes. The coupling is adapted for enabling one pipe to be removed and replaced from a series of pipes without substantially moving any adjacent pipes.

Abstract: A device for distributing gases in liquids, comprising: an aerating element made out of plastic, with an upper side and a lower side joined with the upper side, a support element, and a gas inlet, wherein the aerating element comprises at least one cavity that can be filled with gas through the gas inlet, wherein at least the area of the upper side of the aerating element comprises holes, perforations or the like as the gas outlet, and wherein the support element is situated in the cavity of the aerating element. In order to enable a uniform and reliable aeration of larger water surfaces in a cost-effective manner, it is proposed that the width of the support element be greater than its height.

Abstract: Provided is a super-micro bubble generation device providing super-micro bubbles using a simple method and having a higher degree of freedom of installation so as to be suitable for a place where the device is to meet functional requirements. A super-micro bubble generation device is provided with a compressor for delivering gas under pressure, and also with a bubble generation medium for discharging the gas, which has been delivered under pressure, as super-micro bubbles into liquid. The bubble generation medium consists of a high-density compound which is an electrically conductive substance. The super-micro bubble generation device is also provided with a liquid jetting device for jetting liquid in the direction substantially perpendicular to the direction in which the bubble generation medium discharges the super-micro bubbles, said liquid being the same kind of liquid as the liquid into which the super-micro bubbles are discharged.

Abstract: Aspects of the invention are directed to an apparatus comprising a proximal end adapter, a distal end adapter, a support tube, and a flexible diffuser membrane. The support tube is disposed between the proximal end adapter and the distal end adapter, and comprises an outward facing surface that defines a series of ridges thereon. The diffuser membrane, in turn, defines a plurality of perforations, and surrounds at least a respective portion of each of the proximal end adapter, the distal end adapter, and the support tube.

Abstract: A water tank system having a tank with an inner cavity adapted to hold water, with a filling aperture in a top surface of the tank and a spout is in a first side near a bottom surface, with an air pump external to the tank, an air stone in the inner cavity of the tank which is connected to the air pump via a tube, the air stone is adapted to gradually diffuse oxygen into the water in the tank, and an air water trap that is S-shaped and generally hollow and has an open first end and an open second end, the first end penetrates the top surface of the tank, the air water trap allows condensation to collect and air to be exhausted from the tank.

Abstract: An aeration system has aerators that remain generally full of air when the supply of pressurized air is turned off or vented. Water does not reach the bubble discharging holes of the aerator, which are kept from plugging. The aerator has a body with a hole through a wall of the body to discharge bubbles. The hole is surrounded by a skirt at the wall of the body. The skirt extends to below the elevation of the hole. The aerator body is connected to a source of pressurized gas through an open bottomed chamber. An opening between the aerator body and the inside of the chamber is located below the elevation of the hole. When the supply of gas is off, water enters the chamber and possibly the skirt. However, the water can only rise until it has reached the skirt and the opening, both of which are below the hole, and the entire aerator body is kept dry. Aerator fouling is reduced, and the aerator begins to produce an even flow of bubbles quickly when the supply of gas returns.

Abstract: An apparatus for a programmable self sanitizing water dispenser apparatus with a digital controller as well as a programmable method for generating ozone for cleaning the reservoir and the water contained within it. The apparatus includes an anti-spill receiver that houses the controller and that can contain a ozone generator.

Abstract: Embodiments disclosed herein can introduce low amounts of gas in a liquid with fast response time and low variation in concentration. In one embodiment, a gas is directed into an inlet on a gas contacting side of a porous element of a contactor and a liquid is directed into an inlet on a liquid contacting side of the porous element of the contactor. The liquid contacting side and the gas contacting side are separated by the porous element and a housing. The gas is removed from an outlet on the gas contacting side of the porous element at a reduced pressure compared to the pressure of the gas flowing into the inlet of the contactor. A liquid containing a portion of the gas transferred into the liquid is removed from an outlet on the liquid contacting side of the porous element, producing a dilute bubble free solution.

Abstract: A multi-disc air diffuser according to the present invention comprises a bolt having a vent groove formed in a longitudinal direction thereof; a plurality of discs, each of the discs having a bolt joint section to be passed through the bolt, an air room for holding the air supplied through the vent groove, and a nozzle section having a plurality of nozzles which are arranged in an end part of the air room at a regular size and intervals, wherein the lower surface of each of the discs is more than the upper surface thereof and the outer circumference surface of each of the discs is formed to be inclined; and a backflow prevention section for joining to an end part of the bolt to adhere closely the discs to one another, connecting the vent groove to an air supply pipe, and having a check valve to prevent the air flowing backward from the vent groove to the air supply pipe.

Abstract: A method for generating and dissolving nano-bubbles in a liquid comprises the steps of preparing a bamboo filter by partially or entirely removing an enamel layer of a bamboo and using a bamboo fibrous layer therein as a component of a filter; applying a gas to an inside of the bamboo filter with a pressure over atmospheric pressure in a state where the bamboo filter is submerged in water; and making the gas permeate from an inside of the bamboo fibrous layer to an outside thereof, thereby forming nano-bubbles and at the same time dissolving the gas in the liquid. The present invention advantageously allows the generation of nano-sized fine bubbles by a filter member made of naturally occurring material so that the nano-bubbles are dissolved in a liquid, without applying external mechanical force to the water.

Abstract: A method for treating contaminants includes emitting plural streams of a fluid into a soil formation with the streams having different radii of influences in different directions. A directional microporous diffuser directionally emits microbubbles. Solenoid controlled valves control fluid or air distribution to inlets to provide directional control of bubble emanation.

Abstract: Systems and methods for diffusing gas into a liquid are disclosed. In some cases, the methods include tangentially introducing a liquid into a cylindrical chamber having a cylindrical inner wall such that the liquid develops a spiral flow. In some cases, gas bubbles are orthogonally introduced into the liquid as the liquid flows through the chamber. In some cases, a flow of the liquid and the gas bubbles is controlled such that a ratio of a liquid flow rate to a gas bubble flow rate does not exceed values which convert non-bacteria enriched, clear water into froth. In such cases, a mixture of the liquid and the gas bubbles to exit the chamber near an output end. While the liquid can include clear water, in some instances, the liquid also includes bacteria (e.g., surfactant-producing or non-surfactant-producing bacteria) and/or bacterial nutrients that allow for improved bioremediation.

Abstract: The present invention is a bubbler having a diptube inlet ending in a bubble size reducing outlet and at least one baffle disc positioned between the outlet of the diptube and the outlet of the bubbler to provide a narrow annular space between the baffle disc and the wall of the bubbler to prevent liquid droplets from entering the outlet to the bubbler. The bubble size reducing outlet is an elongated cylindrical porous metal frit situated in a sump of approximately the same dimensions. A metal frit is placed at the inlet of the outlet of the bubbler. The present invention is also a process of delivering a chemical precursor from a bubbler vessel having the above structure.

Abstract: The buoyant aerator with support legs is disposed in a body of water and supplied with air from a remote source. The remote source may be land-based or based upon a floating vessel. An air supply line extends from the remote air source to the aerator, the supply line being supported by one or more rigid poles or columns anchored into the floor of the body of water. The entire aerator structure floats to hold the aerator at a constant level and is held in position by restraining cables. A plurality of rigid support legs extends from the periphery of the float to support the aerator in conditions where the water level drops below the height of the aerator as defined by the vertical distance between the float and the support pads of the legs.

Abstract: There is a standpipe arrangement for holding and for supplying gas to aerators in a clarifying basin. The standpipe arrangement comprises a pipe conduit with holding means for aerators, with gas openings to the aerators and with means of fastening the pipe conduit on the base of the clarifying basin. The pipe conduit comprises several support pipes connected to each other, at the connection points of which fastening means are arranged. By way of the fastening means the support pipes are fixed both at a distance above the base of the clarifying basin as well as laterally and against rotation about the pipe axis, but can be moved along the pipe axis.

Abstract: Wastewater is treated by providing a distribution conduit and providing a diffuser assembly. An aperture is created in the distribution conduit having an initial minimum diameter. The diffuser assembly, in turn, comprises a diffuser membrane in fluidic communication with a mating tube. The mating tube has an initial outside diameter at a location along its length greater than the initial minimum inside diameter of the aperture. The mating tube is inserted into the aperture until the location on the mating tube that, before insertion, had the initial outside diameter is encircled by the aperture where the aperture, before insertion, had the initial minimum inside diameter. This forms an airtight interference fit between the distribution conduit and diffuser assembly.

Abstract: An apparatus for a programmable self sanitizing water dispenser apparatus with a digital controller as well as a programmable method for generating ozone for cleaning the reservoir and the water contained within it. The apparatus includes an anti-spill receiver that houses the controller and that can contain a ozone generator.

Abstract: A micro-bubble generating device is provided which is capable of mixing or dispersing micro-bubbles into a liquid with high stability and has a simple structure that permits reduction of a cost of manufacture. A first member and a first packing are superposed on each other on one side of a gas-permeable film, while a second member and a second packing are superposed on each other on the other side of the gas-permeable film. A pressurized gas delivered via a gas inlet of the first member flows through a fluid passage of the first packing, permeates through the gas-permeable film, and is ejected as micro-bubbles into a liquid flowing through a fluid passage in the form of a narrow shallow strip-like groove provided in the second packing.

Abstract: The aerator air distribution manifold has a central plenum disposed at the lower end of a concentric rigid downpipe or duct, and a radial array of diffuser tubes extending from the plenum. Since the aerators are buoyant, the aeration tubes are deployed at a constant, uniform depth below the surface of the water at all times, regardless of the water level. All of the aerator manifolds receive their air supply from a remotely disposed air source. The air source may be based on shore, or may be based upon a ship or other floating vessel. A flexible air supply line or hose extends from the air supply to each of the buoyant aerators, the hose being supported by one or more rigid columns or poles anchored into the bottom of the body of water in which the aerators are placed.

Abstract: A sparger includes a body bounding a compartment. A tubular port or tube is coupled with the body. The tubular port or tub bounds a passage that communicates with the compartment of the body. At least a portion of the body includes of a first sparging sheet. The first sparging sheet includes a flexible sheet of a gas permeable material such that a gas passing into the compartment of the body through the passage can exit the compartment by permeating through the first sparging sheet.

Abstract: Apparatus and process for dissolving gas in a liquid. The process comprises: tangentially introducing a liquid into a chamber having an inner wall with sufficient volume and pressure to develop a vortex in the flowing liquid; orthogonally introducing gas into the flowing liquid through means located at the chamber inner wall for developing gas bubbles within the liquid. The apparatus comprises: a cylindrical chamber having a cylindrical inner wall, the chamber being oriented in any direction enclosed at both ends and with an entry port to introduce liquid to develop a spiral flow of liquid along the chamber inner wall toward the output end, a porous wall to permit the introduction of gas orthogonally into the stream to develop gas bubbles within the stream, and an exit port to discharge the mixture of gas bubbles and liquid.

Abstract: A portable aeration device includes a housing having an air chamber in communication with an ambient air source, a supply area, a valve restricting airflow between the air chamber and ambient air source, and a valve restricting airflow between the chamber and supply area. The housing defines an exit in communication with the supply area, the aeration device having a cap selectively covering the housing exit. The aeration device includes a diffuser having a plurality of openings, an output tube extending from the diffuser to a location in communication with the supply area to alternately supply air from the supply area to the diffuser and allow liquid to pass from the diffuser to the supply area. A pump is in communication with the air chamber to force air from the air chamber to the supply area. The aeration device includes a fastener for attaching the housing to a water bottle.

Abstract: The present invention is a modular tower structure comprising a common up-flow column topped with a covered header to which multiple independent down-flow and scavenger columns are attached. It employs a renewable energy process for extracting energy from the atmosphere. The process works by creating a vacuum into which atmospheric air is drawn through a vacuum operated motor driver. The motor in turn can operate other mechanisms as electric power generators. A scavenger column and a header operate independently to collect and remove air before it can accumulate in the tower header and interfere with the siphon process. The tower header is equipped to remove solids or floatables before they can collect at the top of the header and interfere with the process. The header cover is removable for inspection and ease of maintenance.

Abstract: The water aerator using a compressed gas container is a self-contained unit having a float and a container of compressed gas (e.g., air, oxygen, etc.) installed beneath a perforated diffuser plate that, in turn, is positioned below the float. High-pressure gas from the container flows through a pipe or tube to a regulator valve and pressure gauge at the top of the pipe. A larger diameter low-pressure pipe or tube is placed concentrically about the high-pressure pipe. Regulated low-pressure gas flows down through the outer low-pressure pipe to a dispensing nozzle below the diffuser plate, whereupon the gas flows upward and is broken up by the perforations in the diffuser plate to form smaller aeration bubbles. An electrical power source, pressure switch, and light may be provided to indicate when the compressed gas container is depleted. The device may be motorized.

Abstract: The present invention comprises a method and system for the infusion of a gas into a liquid. The gas is passed through a container with ceramic filtering material of a specific pore size after which the gas enters the flow stream of the liquid.

Abstract: A diffuser apparatus which has fine pores is capable of achieving a high oxygen transfer efficiency and rarely becoming clogged so that the apparatus can be operated stably over a prolonged period. The diffuser apparatus includes: an aeration plate that is disposed in an aeration tank in order to release pressurized air, fed from a diffusing air feed pipe, as air bubbles from fine pores formed in an aeration plate surface; blow water feeder for feeding blow water into the diffusing air feed pipe; and an inserted pipe for discharging the blow water, fed into the diffusing air feed pipe, from the aeration plate.

Abstract: A diffuser for oxygenation of aqueous media comprises a manifold connectable to a source of pressurized oxygen-containing gas and having a plurality of outlet ports communicating a hollow interior of the manifold with an exterior thereof. A plurality of flexible microporous tubular membranes each have a coupled end secured to the manifold at a respective one of the outlet ports thereof to communicate an internal passage of the tubular membrane with the hollow interior of the manifold. An elongated rod extends along each tubular membrane within the internal passage thereof to maintain a length of the tubular membrane in an orientation projecting outward from the manifold with the free end of the tubular membrane further outward from the manifold than any other portion of the tubular membrane. The rods prevent curling of the tubular membranes over time when the diffuser is submerged in a liquid medium for use.

Abstract: A bottle includes a bottle main body having a bottle mouth portion at an upper part, and a dip tube dipped into a liquid stored in the bottle main body. An upper end of the dip tube is arranged on an inner side of a peripheral wall of the bottle mouth portion with a void part that communicates inside and outside of the bottle main body provided through the bottle mouth portion.

Abstract: An aeration device adapted for the introduction of gas into a liquid medium is provided, including an elongated primary distribution member with a proximal end adapted to be connected to a gas source and a distal end adapted to be immersed into the medium. Additionally, at least one aeration member is connected to the primary distribution member at a location on the distribution member spaced from the proximal end thereof and being in fluid communication with the distribution member, adapted for bringing the gas into a state entrappable within the liquid medium. Also, a flotation member is provided, mounted onto the primary distribution member and adapted to assume various positions along the distribution member according to the level of the liquid medium. An aeration system is also provided, the system including an array of aeration devices as described above.

Abstract: A multi-dimensional image rendering device for displaying multi-dimensional images by layering 2D physical pixel configurations featuring a plurality of tubes in a tank, the inner cavities of the tubes are each filled with a liquid medium such that an air pocket is disposed at the first end of each tube; displacement components slidably disposed in the inner cavity of each tube that can slide between a down position and an up position; a tube aperture disposed in each tube; and a moving means operatively connected to each displacement component functioning to systematically move the respective displacement component a fixed distance creating uniform air bubbles.

Abstract: An aeration system has aerators that remain generally full of air when the supply of pressurized air is turned off or vented. Water does not reach the bubble discharging holes of the aerator, which are kept from plugging. The aerator has a body with a hole through a wall of the body to discharge bubbles. The hole is surrounded by a skirt at the wall of the body. The skirt extends to below the elevation of the hole. The aerator body is connected to a source of pressurized gas through an open bottomed chamber. An opening between the aerator body and the inside of the chamber is located below the elevation of the hole. When the supply of gas is off, water enters the chamber and possibly the skirt. However, the water can only rise until it has reached the skirt and the opening, both of which are below the hole, and the entire aerator body is kept dry. Aerator fouling is reduced, and the aerator begins to produce an even flow of bubbles quickly when the supply of gas returns.

Abstract: The water aeration capsules provide a quick and highly portable system for aerating polluted water. The capsules contain bubbles of air, oxygen, and/or other gas(es) surrounded by a water soluble shell or membrane of a suitable substance, e.g., various salts, sugars, water-soluble polymers, such as polyvinyl alcohol. The capsules are ballasted to make their specific gravity greater than the water they displace. The ballast may comprise any non-toxic metal, sand, clay, or other non-organic material, and/or fish bait or other food for aquatic animals. Magnetically attractive ballast elements may be provided, and a magnetic sheet may be placed on the bottom of a smaller body of water to enhance the settling of the capsules. Various means of dispensing the capsules from various mobile carriers are also disclosed, including dispensing by hand from shore or by a diver, from a small boat or larger ship, and/or from aircraft.

Abstract: A diffuser membrane for use in a wastewater treatment application comprises an additive or coating operative to substantially reduce the ability of at least a portion of the diffuser membrane to buildup static charge. Aeration efficiency and contamination resistance are thereby improved.

Abstract: An aeration assembly includes an end fitting having a top piece for attachment to a diffuser member. A gasket extends beneath the top piece. The aeration assembly may include a diffuser member with the end fitting. In one embodiment, the diffuser member has a hollow conduit section and a flange section. The flange section includes a series of openings extending along a length of the diffuser member. The openings extend through the flange section to an interior space in the conduit section.

Abstract: An apparatus for a programmable self sanitizing water dispenser apparatus with a digital controller as well as a programmable method for generating ozone for cleaning the reservoir and the water contained within it. The apparatus includes an anti-spill receiver that houses the controller and that can contain a ozone generator.

Abstract: A diffuser membrane and a method for manufacturing the same are provided. In the method for manufacturing, a first material is heated and extruded to form a base layer and a second material is heated and extruded to form a coating layer. The base layer and coating layer may be extruded substantially simultaneously in a coextrusion process. Accordingly, the coating may be applied to the base layer in a manner that optimizes the bonding between the two layers and provides the ability to control the thickness of the coating layer. Alternatively, the base layer is formed initially and the coating layer is subsequently formed thereover. The first and second materials have differing properties. The first material may comprise polyurethane and the second material may comprise polyurethane and PTFE.

Abstract: An aerator particularly useful in the aeration of waste treatment systems. The aerator has a hollow support pipe communicating air to arms having diffuser stones, the support pipe extending upwardly from a weighted base. The diffuser stones are near the ends of the arms. A first pair of arms is lower than a second pair of arms and each pair of arms has a common axis. The axes of the arms are angled relative to each other. The diffusers on the lower pair of arms are angled upward and the diffusers on the upper arms are angled downward. The aerator provides a large projected area for the diffusers as viewed from above, and spreads air bubbles laterally away from the aerator. The aerator of the present invention keeps the diffusers above the bottom at an optimized height while maximizing aeration.

Abstract: The present invention relates to a device for the aeration of liquid media by tube aeration, special tube modules contained therein and the use of a device for the aeration of liquid media.

Abstract: Method for treating contaminants at a site, especially a deep well site, includes delivering a first stream of a first gas to a first port of a laminar microporous diffuser and delivering a second stream of a second gas to a second port of the laminar microporous diffuser to effect mixing of the first and second streams of gases within the laminar microporous diffuser.

Abstract: A micro-bubble generating device is provided which is capable of mixing or dispersing micro-bubbles into a liquid with high stability and has a simple structure that permits reduction of a cost of manufacture. A first member and a first packing are superposed on each other on one side of a gas-permeable film, while a second member and a second packing are superposed on each other on the other side of the gas-permeable film. A pressurized gas delivered via a gas inlet of the first member flows through a fluid passage of the first packing, permeates through the gas-permeable film, and is ejected as micro-bubbles into a liquid flowing through a fluid passage in the form of a narrow shallow strip-like groove provided in the second packing.

Abstract: The present invention relates to an apparatus and a process for efficient hydrophobic particles to gas bubble attachment in a slurry is provided. The process comprises: tangentially introducing a slurry stream into a cylindrical chamber having a cylindrical inner wall with sufficient volume and pressure to develop a vortex in the flowing slurry; introducing gas into the flowing slurry during at least a portion of its travel in the chamber, the gas being introduced orthogonally to the stream through means located at the chamber inner wall and for developing gas bubbles which move into the slurry.

Abstract: Method and apparatus for producing a bubble curtain with a diversity of bubble diameters for purposes such as modifying the characteristics of a seismic source used in marine seismic surveys. Bubble generating elements are used that combine porous wall material with discrete holes (91) to create a curtain of diverse-sized bubbles (92).

Abstract: The present invention is a pressure monitoring panel apparatus with a panel housing that contains a programmable logic controller. Pressure transducers transmit the pressures from an aeration basin diffuser head and an aeration basin airline to a programmable logic controller. The programmable logic controller uses the pressures from the aeration basin diffuser head and aeration basin airline to determine the airflow rate through the aeration basin diffuser and the pressure drop across the aeration basin diffuser. Those values are then displayed on a viewable interface.

Abstract: A bubbler (2) for delivering liquid or solid metalorganic compounds to a reactor site. The bubbler has an inner and outer chamber and has a member (14) positioned between its inlet (6) and outlet (8) that is provided with a plurality of apertures therein. The member (14) is preferably in the form of a perforated disc having a predefined density of apertures therein to provide optimum pick up and flow of carrier gas through the bubbler.

Abstract: The vapor blending system is a mechanical system that can create a homogenous vapor blend that is combustible and can be used as a supplemental fuel source for internal combustion engines. The system can be easily retro-fitted on vehicles (cars, trucks, buses, trains, etc.) to produce the vapor on demand. The basic objective of this invention is to create a viable supplement fuel that reduces the amount of carbon emission into the atmosphere when used as a fossil fuel supplement.

Abstract: The present invention relates to an apparatus and a process for dissolving gas in a liquid is provided. The process comprises: tangentially introducing a liquid into a cylindrical chamber having a cylindrical inner wall with sufficient volume and pressure to develop a vortex in the flowing liquid; introducing gas into the flowing liquid during at least a portion of its travel along vessel, the gas being introduced orthogonally to the stream through means located at the chamber inner wall for developing gas bubbles within the liquid. The apparatus comprises: a cylindrical chamber having a cylindrical inner wall, the chamber being oriented in any direction enclosed at both ends and with an entry port to introduce liquid to develop a spiral flow of liquid along the chamber inner wall toward the output end, a porous wall to permit the introduction of gas orthogonally into the stream to develop gas bubbles within the stream, and an exit port to discharge the mixture of gas bubbles and liquid.

Abstract: An arrangement for introducing gas bubbles into a liquid, a device for fastening a perforated aeration membrane to an aerator base plate, and an aerator base plate therefor. The aerator base plate has an undercut groove in at least one rim region thereof, into which a locking body clamping the membrane in the groove fits clampingly. The locking body has a generally circular cross-section. The groove has an at least substantially oval cross-section. The locking body is designed to be generally cylindrical.

Abstract: In a method for air treatment in a display cabinet for the storage and/or display of objects, whose walls, floor and roof structure more or less enclose the inside space of the display cabinet and in which a forced inflow of air from an air delivery system connected to the inside space (1) of the cabinet maintains a slight excess pressure compared with the air outside it, the said airflow passes through suitable dust or gas filtration means before entering the cabinet and its air humidity is adjusted and/or controlled by means of a cooling device. After filtration, the airflow passes through a catalyser (8) present in a liquid (7), the air picks up moisture from the liquid and is rendered completely free from germs. In this manner and in a simple way, a completely germ-free atmosphere is produced inside the display cabinet. A display cabinet for implementing the method has a corresponding structure.