Abstract: The invention relates to a modular flow system having a plurality of frame elements (101, 102) configured to be combined together to form a stack for forming a functional member such as in particular a membrane distillation stage, a vapor generator, a condenser, a heat exchanger, a filter and/or a pervaporation stage, wherein the frame elements (101, 102) each include: an outer frame (39) and an inner frame (43), the inner frame (43) encasing a central inner region (40) and being surrounded by the outer frame (39), at least one first passage opening (13 to 16) arranged between the outer frame (39) and the inner frame (43) and separated from the central inner region (40) by a frame wall on a first and/or opposite second frame side of the inner frame (43), and at least one liquid passage (45, 46) provided by the frame wall and configured to distribute a liquid from the first passage opening (13) to a feeding area (40?) and/or to collect a liquid from the feeding area (40) to the first passage opening (16a, 16b)

Abstract: A liquid redistributor, arranged in a packing column between two packings, wherein in the column a liquid phase is guided from top to bottom and against the same a gas phase from bottom to top, comprising a liquid distributor tray and a droplet damping tray, which attenuates the fluidization of the liquid layer on the liquid distributor tray as caused by the droplets falling down.

Abstract: Heat exchange apparatus comprises a plurality of thermally conductive, moisture impervious sheets. Each sheet comprises a plurality of corrugations. The plurality of sheets are disposed in a stack such that each alternate sheet has its corrugations affixed to and disposed at an angle to the corrugations of an adjacent sheet to provide a plurality of separate flow pathways. The plurality of separate flow pathways comprises first predetermined pathways and second predetermined pathways. The stack of sheets have first end portions disposed to provide a first inlets and a first outlets for the first predetermined pathways and second end portions to provide second inlets and second outlets for the second predetermined pathways. The corrugations forming the second predetermined pathways comprise a wettable surface. The first predetermined pathways are adapted for a first fluid flow and the second predetermined pathways are adapted for a countercurrent second fluid flow.

Abstract: A scrubber tower of a flue gas purification device, comprising: a flue gas entrance and a flue gas exit, a liquid entrance and a liquid exit, a contact area for said flue gas and said liquid between said flue gas entrance and said liquid entrance, at least one tray installation positioned within said contact area and across at least 50% of a horizontal extension of said contact area. The tray installation provides a multiplicity of through openings for said flue gas and said liquid respectively, which through openings being adjustable individually, in groups or all together in their respective cross sections.

Abstract: The present invention relates to a storage device for fresh products and/or perishable produce and a method for storing fresh products, comprising: a cabinet provided with an access door and/or flap; one or more substantially gastight compartments arranged in the cabinet and provided with at least one gas inlet and one gas outlet; and conditioning means suitable for conditioning the climate in the compartment, wherein the conditioning comprises of providing desired gas conditions, including oxygen content.

Abstract: A composite hanger grid for supporting splash bars in a cooling tower uses separate vertical suspension members and horizontal beams by which all of the operational loads imposed on the splash bars are transferred to the horizontal beams, which then transfer the load to the vertical suspension members. Since all of the horizontal beams are independent of each other and separate components from the vertical suspension members, the horizontal beams will be loaded equally throughout the entire hanger grid. Also disclosed are components of the composite hanger grid, splash bars adapted for use with specific embodiments of the composite hanger grid, assemblies of the composite hanger grid with its supported splash bars, a method of assembling a composite hanger grid and a method of assembling an evaporative cooler fill assembly, including hanger grids and splash bars, in a cooling tower.

Abstract: A mixing device for mixing concurrently-flowing streams of vapor and liquid in a vessel contains flow baffles forming a tangential inlet orifice through which the liquid and vapor streams flow at high flow velocity and in a tangential direction into a swirl box. The high momentum of the streams in the inlet orifice, the tangential direction of the streams, and the large distance between the inlet orifice and the vessel centerline, result in a violent swirling flow and a large number of fluid rotations in the swirl box, thereby thoroughly mixing the streams entering through the inlet orifice. A mixed stream of vapor and liquid exits the mixing device through an outlet opening in the bottom of the mixing device. An impingement plate located below the outlet opening spreads the liquid and decreases the velocity of the mixed stream. The temperature and chemical composition of the mixed stream are equilibrated.

Abstract: A bubble cap assembly for an air distribution grid includes a stem having a top region and a bottom region, a bubble cap connected to the top region of the stem, a membrane having an opening, the bottom region of the stem communicating with the opening; a flange connected to the bottom region of the stem; at least one clamp for pressing the flange against the membrane, and a gasket squeezed between the flange and the membrane by the clamp to provide an air-tight connection between the flange and the membrane.

Abstract: A reactor for carrying out a three-phase reaction of a liquid phase, a gaseous phase, and a catalyst over a fixed catalyst bed is disclosed. The liquid and gaseous phases are passed through the reactor via a mixing and distribution device positioned over the fixed catalyst bed. The mixing and distribution device includes a trough distributor for the liquid phase, having trough-shaped channels, outlet tubes in the trough-shaped channels for the liquid phase, a distributor plate below the trough distributor, and vertical nozzles, having one or more openings for the gaseous phase and one or more openings, arranged below the openings for the gaseous phase. For entry of the liquid phase, the nozzles are installed so that, at a predetermined liquid feed rate, the surface of the liquid on the distributor plate is below the openings for the gaseous phase and above the openings for the liquid phase.

Abstract: A plate that allows the distribution of a polyphase mixture in a reactor that operates in the trickle mode and that consists of at least one gaseous phase and at least one liquid phase, with the plate (10) being located above a catalytic particle bed, comprising a number of shafts (3), and a portion of the shafts of the plate, located close to the wall of the reactor chamber, called peripheral shafts, are truncated. The plate is used in a reactor for the purpose of carrying out hydrotreatment, hydrogenation, or oxidation.

Abstract: There is provided a mixing device (2) for a beverage and CO2 gas for producing carbonated beverage. The mixing device (2) comprising a mixing channel (4) extending in a main direction (10). The mixing channel (4) comprises wide channel sections (16) and narrow channel sections (18) along the main direction (10). The mixing channel (4) has an elongated cross section seen in a direction perpendicular to the main direction (10). At least a first delimiting surface (22) of the mixing channel (4) is provided with protrusions (20) extending at least partially along the first delimiting surface (22) in a direction across the mixing channel (4) and protruding towards a second delimiting surface (24) of the mixing channel (4) to form the narrow channel sections (18). A turbulent flow of beverage is created by the narrow and wide channel sections. Further a carbonator for producing carbonated beverage, an appliance comprising a carbonator, and a method of producing a carbonated beverage are provided.

Abstract: The invention relates to a modular flow system comprising a plurality of frame elements which can be combined by means of welded web structures to various stacks comprising in each case at least two, in particular at least ten frame elements, in order to form different functional units such as in particular a membrane distillation stage, a steam generator, a condenser, a heat exchanger, a filter and/or a pervaporation stage. The frame elements according to the invention comprise in each case an outer frame provided with passage openings and vapor and/or fluid channels as well as a central inner region surrounded by the outer frame. Moreover, each frame element is provided on both sides with a welded web structure that delimits, on the one hand, the region comprising the passage openings and the central inner region and, on the other hand, at least two regions, each comprising a vapor and/or fluid channel.

Abstract: Systems and methods for gas processing are described that utilize two or more cells that are fluidly coupled to one another by a common liquid space. Via the common liquid space, each of the cells can be coupled to a fluid outlet. The cells can each include an absorber and/or other gas processing equipment. A feed gas can be separately fed to each of the cells for processing. The cells can be independently operable, such that not all of the cells must be operated simultaneously.

Abstract: A fluid aerator connectable to the neck of a container holding a fluid, the fluid aerator having a tubular body having one end adapted to sealingly connect to the neck of the container, a plurality of mixing elements disposed within the tubular body, and wherein when the fluid aerator is attached to the neck of the container and fluid is dispensed from the container, ambient air is drawn into the tubular body and mixes with fluid as it passes over the plurality of mixing elements to aerate the fluid.

Abstract: A foam generation apparatus is claimed. The apparatus includes a housing defining an interior portion and two ports disposed on an exterior surface of the housing. One of the ports is adapted to receive chemical into the interior portion of the housing, and another of the ports is adapted to receive compressed air into the interior portion of the housing. The apparatus also includes coarse threads integrally molded at a top portion of the housing. Finally, the apparatus includes an insert that includes a cap, a rod extending from an interior portion of the cap, and one or more agitation balls affixed to the rod. Like the housing, the cap also includes coarse threads formed therein. As such, the insert is disposed within the housing and secured to the housing by way of the coarse threads of the insert and the housing.

Abstract: An aerator may be inserted into the neck of a wine bottle to aerate the wine as it is poured from the bottle. A cavity created in the distal end of the bottle as the wine is dispensed is vented to aid in high flow rate. The aerator seals against the inside surface of a typical wine bottle, and regulates pressures to create high flow and a high degree of aeration throughout the full dispense cycle of wine from the bottle.

Abstract: A firewall structure having double panel walls with a first outer wall and a second outer wall is constructed of fiber reinforced material. Multiple cavities are defined between the outer walls and are at least partially filled with a polyurethane insulation. The surfaces of the first and the second outer walls are coated with a layer of material that resists fire and heat. In one embodiment, the layer of material includes intumescent latex which functions to create a thick char layer when exposed to high temperatures or flames.

Abstract: The xylene isomerization process unit and the transalkylation process units are combined in the present invention. A fractionation column can be shared by the two units, reducing the capital cost of the complex. In some embodiments, a split shell fractionation column and a split separator can be used.

Abstract: Split-shell fractionation columns and associated processes for separating aromatic hydrocarbons are provided herein. In an embodiment, a split-shell fractionation column includes a housing shell having a first height and a partition having a second height and disposed within the housing shell. The partition includes first and second vertically oriented baffles separated by a gap region, a seal plate connecting top ends of the baffles, a first input port formed to extend through the partition for the introduction of a gas into the gap region, and a first output port formed to extend outwardly from a bottom of the gap region and through the housing shell. The partition defines a first distillation zone and a second distillation zone within the housing shell.

Abstract: A structured packing formed of a plurality of corrugated, rectangular sheets and a method relating to the use thereof. End regions of the corrugations are provided with straight, parallel corrugations extending inwardly from opposed edges of the sheets and a right angles thereto to reduce pressure drop at the interfaces between packing layers and thereby increase hydraulic capacity. Contact is promoted between descending liquid and ascending vapor phases within a main region of the corrugations that have straight, parallel sections of the corrugations oriented at an acute angle to the opposed edges. Transition regions having arcuate sections of the corrugations connect corrugations within the main and end regions to reduce internal pressure drop within the structured packing and thereby further reduce pressure drop at the interfaces and further increase the hydraulic capacity.

Abstract: One exemplary embodiment can be a process for contacting one or more fluids in a vessel. The process may include passing one or more fluids into a chamber from an overhead tray and providing a conduit outside the chamber coupling a respective spillway to a respective hole for increasing contact time inside the conduit. Typically, the chamber forms one or more sidewalls forming at least one hole and the overhead tray forms at least one spillway.

Abstract: A method for removing acidity and/or moisture from a hydrocarbon gas, in particular from a natural gas or a refinery gas fraction or a syngas, by absorption into a sweetening liquid and into a dehydration liquid, that are adapted to extract acid compounds or water from the gas, respectively. The method provides a step of prearranging a vertical elongated container (150) comprising at least one inner partition wall (168) that defines at least two treatment chambers within said container (151,152), a step of feeding a treatment liquid from the above into at least one of the two chambers (251,252) and feeding the gas to be treated from below into at least one same treatment chamber.

Abstract: An apparatus and method for removing mercury from an incoming gas stream contaminated with mercury so as to deliver an outgoing gas stream free of the removed mercury introduces ozone into the gas stream to deposit mercury carried by the gas stream on separator elements so as to remove the deposited mercury from the gas stream. The deposited mercury is washed off of the separator elements, and the removed mercury is collected for further processing.

Abstract: A column structure is described for the containment of high surface area packing and absorbent liquid reagent for the removal of a target gas from a gas stream. The column structure comprises a plurality of vessel column modules each having an elongate upright wall structure, each column module comprises a plurality of vertically disposed sub-modules, the modules being disposed together alongside one another in two dimensional array to constitute collectively the column structure. A column top support structure is located in the vicinity of the upper part of a column structure so assembled and each column module is mechanically supported from the column top support structure. A method of assembly of such a column and to a method of removal of a target gas from a gas phase using such a column are also described.

Abstract: An apparatus for generating microbubbles in water from a mixed fluid in which a gas and a liquid are mixed. The apparatus includes a cylindrical body which includes an inlet coupled to a hose, an outlet, and a cylindrical space section defined therein. The diameter of the space section is greater than each diameter of the inlet and the outlet. An inner container member is fixed in the space section such that a tubular passage is formed. A circular first collision section is provided on the inner container member. The mixed fluid that has been introduced through the inlet collides against the first collision section and is thus stirred. An “L” shaped second collision section is provided on the inner corner of the body adjacent to the outlet. The mixed fluid that has passed through the passage collides against the second collision section and is thus stirred.

Abstract: The invention relates to a device for dispersing gas into a liquid. The devise has a number n of successive zones Z1, Z2, . . . , Zn having static mixing elements, wherein each zone Zi has a length Li and an effective diameter Di. The mechanical energy input Et, which is standardised to the particular ratio Li/Di and acts on the gas/liquid mixture, increases from zone to zone in the flow direction. In this connection n is a whole number greater than or equal to 3 and i is an index which runs through the whole numbers from 1 to the number n of zones. The invention further relates to a method for dispersing gas into a liquid using the device according to the invention.

Abstract: A device for aerating a liquid, such as wine, includes a cup portion with a cavity that receives an amount of liquid therein, the cavity extending between a proximal opening and a distal opening. A neck portion of the device defines an aeration section in fluid communication with the cavity. Passages in the aeration section extend laterally to an outer surface of the neck portion through which air is drawn into the aeration section. A central passage through the neck portion is in fluid communication with the aeration section and extends to a distal opening of the device. A diffuser element between the cavity and the aeration section has arms that are configured to contact the liquid as it flows from the cavity to inhibit a swirling flow of the liquid so that the liquid passes into the aeration section in a generally vertical and linear manner.

Abstract: The present invention provides a method and apparatus for the treat en of process gas from an anaerobic digestion system or a landfill gas system. In one embodiment, the system comprises a caustic scrubber including a vertical column having a top and a bottom and including a counter current flow system, wherein a process gas stream flows up vertically through the column in counter current flow to a caustic liquid solution that flows downward through the column.

Abstract: In a bubble-column vapor mixture condenser, a fluid source supplies a carrier-gas stream including a condensable fluid in vapor phase. The condensable fluid in liquid form is contained as a bath in a chamber in each stage of the condenser, and the carrier gas is bubbled through the bath to condense the fluid into the bath. The bubble-column vapor mixture condenser can be used, e.g., in a humidification-dehumidification system for purifying a liquid, such as water.

Abstract: An apparatus for generating microbubbles in water from a mixed fluid in which a gas and a liquid are mixed. The apparatus includes a cylindrical body which includes an inlet coupled to a hose, an outlet, and a cylindrical space section defined therein. The diameter of the space section is greater than each diameter of the inlet and the outlet. An inner container member is fixed in the space section such that a tubular passage is formed. A circular first collision section is provided on the inner container member. The mixed fluid that has been introduced through the inlet collides against the first collision section and is thus stirred. An “L” shaped second collision section is provided on the inner corner of the body adjacent to the outlet. The mixed fluid that has passed through the passage collides against the second collision section and is thus stirred.

Abstract: A column structure (1) for the containment of high surface area packing (5) and absorbent liquid reagent for the removal of a target gas from a gas stream having an elongate upright wall structure defining a perimeter comprising a closed simple polygon or closed simple curve; a support structure extending inwardly from the perimeter of the column towards the top thereof; and slung tensile members (16) attached to the wall structure of the top support structure and extending downwardly to support at least internal column structure within the walls of the column.

Abstract: A ceramic mass transfer packing element that includes a planar end surface which intersects an internal wall's geometric plane at an acute angle is disclosed. A process for making the packing element and an apparatus that uses the packing element are also disclosed.

Abstract: The invention relates to a panel, comprising: two plates of substantially equal dimensions positioned on each other; which plates are connected medium-tightly to each other along their peripheral zones; which plates enclose a cavity; a feed for feeding a liquid, in particular water, into the cavity; and openings close to and along a peripheral edge of the panel for flow of the liquid out of the cavity during operation such that during operation the openings are situated close to the upper peripheral edge of the panel, wherein the liquid flows downward over at least one outer surface of the panel.

Abstract: The present invention provides a packing element comprising at least one sheet having a plurality of deformations, the sheet being operable to form a folded or helical configuration wherein adjacent portions of the at least one sheet are spaced to allow for flow of at least one of fluid, air and gas therebetween.

Abstract: The invention relates to a corrugated packing grid with consecutively arranged wave crests and wave troughs for a structured packing, which is assembled from several packing grids, for gas-liquid contacting apparatuses, and to a packing assembled from said packing grids. The aim of the invention is to provide a packing grid and a packing which have a large mass transfer area and a low pressure drop at the same time and which offer a high mechanical strength. According to the invention, this is achieved in that elements lie in the region of the wave troughs of the packing grid, said elements extending into the wave troughs.

Abstract: A downcomer for a gas-liquid contacting device. The downcomer may include first and second spaced apart side walls, first and second end walls, a floor, and first and second opposing discharge walls. Generally, each end wall is coupled to a respective end of the first and second side walls. Typically, the floor is coupled to the side walls and end walls, and the floor has at least one section adapted for permitting the passage of liquid there-through. The first and second opposing discharge walls can be coupled to respective first and second side walls and having respective ends below the floor.

Abstract: A downcomer for a gas-liquid contacting device. The downcomer may include first and second spaced apart side walls, first and second end walls, a floor, and first and second opposing discharge walls. Generally, each end wall is coupled to a respective end of the first and second side walls. Typically, the floor is coupled to the side walls and end walls, and the floor has at least one section adapted for permitting the passage of liquid there-through. The first and second opposing discharge walls can be coupled to respective first and second side walls and having respective ends below the floor.

Abstract: A cooling tower module features at least one heat exchange panel, a central column, a horizontal beam extending outward from the central column, and a first side structure connected to the horizontal beam to support the horizontal beam and connected to the panel to provide support to the at least one heat exchange panel. A cooling tower facility has one or more modules. The facility can cool fluid or condense steam by interaction with ambient air.

Abstract: A structured packing for a reactor is formed from a metal sheet to promote heat and mass transfer near the wall of the reactor. The structured packing causes lateral flow of fluids flowing through the packing such that jet impingement of at least one reactor wall is promoted. The packing may be used in a cylindrical, annular or plate-type reactor, e.g., a catalytic reactor, or a heat exchanger.

Abstract: A mass-exchange contact device is proposed, comprising an upper tray, contact element including a barbotage unit configured as an inner cap with strips tangently bent out, a lower tray, a casing including a ring-shaped descending limiter, windows circumferentially disposed on the casing's walls (lower row), orifices circumferentially disposed on the casing's walls (upper row) above the windows, a double-acting valve composed of an upper and lower plates fixedly attached to a distance rod, and a cover bushing disposed coaxially to and around the upper region of casing embracing the contact element. Embodiments comprise a number of rows of the proposed devices situated one above the other, and separated by multi-layer packing fittings. In catalytic distillation columns, the fittings can be filled with catalytic material. Alternatively, the fitting is substituted with a grating that supports a catalytic granular layer. The device allows improving operation, reliability, durability, reducing its weight and costs.

Abstract: The invention relates to a modular flow system comprising a plurality of frame elements which can be combined by means of welded web structures to various stacks comprising in each case at least two, in particular at least ten frame elements, in order to form different functional units such as in particular a membrane distillation stage, a steam generator, a condenser, a heat exchanger, a filter and/or a pervaporation stage. The frame elements according to the invention comprise in each case an outer frame provided with passage openings and vapour and/or fluid channels as well as a central inner region surrounded by the outer frame. Moreover, each frame element is provided on both sides with a welded web structure that delimits, on the one hand, the region comprising the passage openings and the central inner region and, on the other hand, at least two regions, each comprising a vapour and/or fluid channel.

Abstract: Vapor-liquid contacting apparatuses comprising a primary contacting zone and a secondary contacting zone are disclosed. A representative secondary contacting zone is a secondary absorption zone, such as a finishing zone for subsequent contacting of the vapor effluent from the primary contacting zone to further remove impurities and achieve a desired purity of purified gas exiting the secondary absorption zone. The secondary contacting zone is disposed below the primary contacting zone, such that the secondary contacting zone, which must operate efficiently in removing generally trace amounts of remaining impurities, is more protected from movement than the more elevated, primary or initial contacting stages for bulk impurity removal. The apparatuses are therefore especially beneficial in offshore applications where they are subjected to rocking.

Abstract: A fluid inlet device (1) suitable for introducing a mixture of liquid and gas into a vessel, which fluid inlet device comprises a guide member having a surface on which surface a liquid film is present during normal operation, and having a main direction of gas flow along the surface; and wherein the guide member (20) is provided with a liquid catcher channel (40) extending from an upstream position with respect to the guide member (20) to a downstream position, and wherein a virtual line along the guide member between the upstream position and the downstream position deviates from the main direction of gas flow; the use of the fluid inlet device for introducing a mixture of liquid and gas into a gas-liquid contacting vessel; and a method of retrofitting a fluid inlet device.

Abstract: Bubble generator devices to produce a fluid stream comprising bubbles are described. Apparatuses that include any of the described bubble generator devices to treat waste and/or frac-water are also described.

Abstract: A fluid inlet device (1) suitable for introducing a mixture of liquid and gas into a vessel (5), which fluid inlet device (1) comprises an inlet flow channel having an inlet end (12) for receiving the mixture of liquid and gas; and a plurality of curved guiding vanes (20), wherein each vane (20) comprises an intercepting part (22) extending towards the inlet end of the inlet flow channel, and an outwardly directed deflecting part (25) defining a generally convex side and a generally concave side of the curved vane, wherein the deflecting parts (25) of two consecutive vanes form an outlet channel of the inlet device and define a main direction of gas flow in the outlet channel, and wherein at least one of the vanes (25) is provided with a liquid catcher (40) oblique to the gas flow direction.

Abstract: [Technical Problem] A contactor is provided which is capable of making fluids of two phases contact each other under a good dispersion state and which can be easily multi-staged. [Means for Solving the Problems] The inside of a contactor 1 is divided into a plurality of cells 22, 32 by partition walls (a vertical wall 10, horizontal walls 21, 31) and the respective cells 22, 32 become countercurrent contacting spaces of an upflow fluid flowing up in the contactor 1 and a downflow fluid flowing down in the contactor 1. A downflow fluid injection hole 52 provided in the vertical wall 10 of each stage makes the downflow fluid blocked by the partition wall and residing inject into the neighboring cells 22, 32 of a lower stage side, while an upflow fluid flow-in port 51 provided in an upper side of the injection hole 2 makes an upflow fluid from the cells 22, 32 of the lower stage side flow in.

Abstract: An electrolytic method for treatment of water to increase the dissolved oxygen content, the method including: (a) contacting the water with at least one first electrode device; (b) providing at least one second electrode device in non-physical, electrical contact with the water; (c) introducing an oxidant to the water, and (d) passing an electric current between the second electrode device and the first electrode device, so as to establish an electric field in the water of sufficient strength and duration to effect the electrolytic dissociation of the water to produce dissolved oxygen and/or hydrogen species.

Abstract: Systems and methods for lowering levels of carbon dioxide and other atmospheric pollutants are provided. Economically viable systems and processes capable of removing vast quantities of carbon dioxide and other atmospheric pollutants from gaseous waste streams and sequestering them in storage-stable forms are also discussed.

Abstract: A waste gases-neutralizing device comprises a filter installation with at least one filter unit with an inlet and an outlet between which a filter is received to remove undesired components from the waste gases. The installation has a modular construction and comprises a number of filter units which are placed in series in a flow path of the waste gases and/or a reactor vessel provided with a nozzle with mixing chamber in which waste gases are at least partially removed with a mixture of at least one neutralizing compound and oxygen under pressure. The filter units each comprise a filter adapted to a specific component or group of components to be removed from the waste gases. The waste gases-neutralizing device preferably also comprises, in addition to the filter installation, a neutralizing unit 21 comprising a neutralizing liquid bath or a fixed connection impregnated with a neutralizing liquid.

Abstract: An indoor air purification apparatus and method includes a watertight chamber including a top portion having a water inlet, a first air portal, a second air portal, a bottom portion, and a plurality of shelves mounted between the top portion and the bottom portion. Water continuously flows from the water inlet at the top of the chamber, typically falling over the shelves to a reservoir. Typically, a water pump returns the water to the water inlet at the top portion of the chamber through at least one conduit leading from the reservoir. An air pump typically drives the room air through the chamber from one air portal to the other and back into the room. The room air is purified as it mixes with the water cascading over the shelves.