Abstract: A system and method for increasing the functionality of a heat pump by collecting condensed water from the cold element of the heat pump and applying the condensed water to humidify the atmosphere of an enclosure being heated or cooled or applying the water to cool a hot element of the heat pump.

Abstract: A water treatment system comprising: a container having a first end, a second end and a container wall defining an interior and an exterior; an aerator completely disposed within the interior, the aerator comprising an aerator wall having a plurality of perforations, the aerator configured to rotate in a liquid contained in the interior such that the aerator is partially disposed in the liquid, the aerator configured to aerate the liquid, wherein the plurality of perforations are configured to lift a thin film of the liquid from the container by exploiting the surface tension of the liquid, wherein the thin film bridges the plurality of perforations, and the aerator is configured to create a cascading bubbling turbulent flow in the liquid flowing along the aerator wall, as well as the liquid contained in the container; and a rotary motive force element coupled to and configured to rotate the aerator.

Abstract: An air humidifier has an electric fan unit arranged in a housing for delivering a through-flow of air between feed-air and discharge-air openings in the housing; at least one filter device for the through-flow of air; and a device for releasing liquid to the through-flow of air. A first housing component accommodates the fan unit with filter strips and feed-air and discharge-air openings. A second housing component is a vessel for storing liquid. The two housing components form autonomous structural units which can be fixed to and detached from one another. It is possible for the first housing component to be utilized as a separate unit independently of the second housing component.

Abstract: An apparatus and method for mixing gas and liquid comprising a dome, lower housing, aerator device and flotation device, wherein intermeshed rotating sets of discs operate on parallel shafts driven by variable speed drives, and strakes are radially mounted on the discs to carry liquid up into a mixing area and to carry air and liquid down into a mixing area resulting in a shear force that drives air into the oxygen depleted liquid. The dome and lower housing create an air tight space, wherein the barometric pressure is raised by a blower, in order to pop foam bubbles and allow for optimum mixing of air into the oxygen depleted liquid, and intake and discharge openings of the lower housing are positioned beneath the liquid line, thereby preventing the escape of foam, noise and odorous gases into the local environment.

Abstract: The combined waterwheel oxygen-increasing machine pertains to the area of life-saving and facilitation equipment in aquaculture development. The existing waterwheel oxygen-increasing machine is a floating body with brackets integrally connected, inconvenient for assembly and disassembly and for general use. The present invention comprises of floating bodies, a power device, a reduction gearbox and impellers, wherein the power device is connected to a reduction gearbox, which then drives said impellers via an output shaft. The floating bodies are hollow, closed, bodies including longitudinal floating bodies and transversal floating body connected vertically with each other, wherein one end of the longitudinal floating bodies are connected to transversal floating body. The floating bodies bear an output shaft. The impellers are located in the midst of the area surrounded by the longitudinal floating bodies and the transversal floating body.

Abstract: An apparatus for mixing gas and liquid is disclosed. The apparatus may have a plurality of blades rotated about a common shaft. The blades may have a forward portion, which cuts through a liquid, and a trailing portion, which forms the leading part of a gas cavity. The gas cavity is in communication with a gas inlet and the bulk fluid. As the blades pass through a liquid, a reduced pressure zone is formed immediately behind the blade. The reduced pressure zone allows air to be aspirated from the gas inlet into the gas cavity adjacent to the blade. Gas in the gas cavity is sheared into discrete bubbles and transferred to the liquid by the action of the trailing blade wake currents.

Abstract: A self-cleansing media and systems incorporating the same, for a rotating biological contactor, are described. The media includes a disk having cones extending perpendicularly from the surface thereof. Two or more disks lock together, axially about a rotating central shaft, by connecting cones spaced throughout the disk surface having a socket at their base to receive the top of the corresponding connecting cone on the adjacent disk. The cones, by virtue of their length, space the disks a desired distance. The disks include disk segments that can link to one another along either straight and/or curved portions thereof. The geometry of the media provides free passage of the air and water during each revolution, and while the base disk slices through the air and water, the projecting cones or cylinders enter the air and water perpendicular to the direction of rotation and are washed and cleansed during each rotation.

Abstract: The disclosed device is directed toward a rotary water treatment system comprising at least one open channel cell configured to contain a liquid. A cylinder partially disposed in the open channel cell. The cylinder having a first end and a second end opposite the first end, and a cylinder wall coupled between the first end and the second end. The cylinder wall including a plurality of perforations formed in the cylinder wall. A motive force element is coupled to the cylinder configured to impart rotary motion to the cylinder. At least one influent supply is coupled to the at least one open cell. At least one effluent discharge is coupled to the at least one open cell. A pump is fluidly coupled to the at least one influent supply.

Abstract: The invention relates to a floating paddlewheel aerator for aerating water or clearing basins. The paddlewheel aerator includes a frame (1) of elongated floats (2, 3), which are substantially arranged at a right angle to each other and are linked with each other in a T or H configuration. On a first float (2), further floats (3) or sections of floats are mounted on both of the first float's opposite ends. The first float (2) has a top which is turned upwards by 90° compared to its lateral sides on which further floats/float sections (3) are mounted and carries a drive unit (9). This drive unit (9) is mounted completely or partially on the floats, and its output shaft (10) projects outwardly from both sides parallel to the longitudinal extension of the further floats/float sections (3).

Abstract: A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty to dissolve or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for relative rotation one to the other and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to cause formation of a gas-in-liquid emulsion of the gas in the liquid, as the liquid and gas pass through the processing passage.

Abstract: A humidifier meters water into a chamber in which it is subjected to ultraviolet light for a predetermined period of time sufficient to destroy microorganisms whereupon the static quantity of water is transferred to a water dispersing unit which discharges the decontaminated water in a finely divided form into the environment.

Abstract: A humidifier includes a humidifier housing, a fan, and a water wheel device. The humidifier housing includes a lower base member that defines a liquid-containing compartment, and an upper cover member mounted on the lower base member and formed with a vapor outlet. The fan is mounted in the upper cover member, and is operable so as to generate air currents that flow through the vapor outlet. The water wheel device includes a horizontal wheel axle mounted rotatably in the humidifier housing, a drive motor for driving axial rotation of the wheel axle, and a plurality of disc members mounted spacedly and co-rotatably on the wheel axle. Each of the disc members has a lower disc portion extending into the liquid-containing compartment, and an upper disc portion disposed under and adjacent to the fan.

Abstract: A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty to dissolve or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for relative rotation one to the other and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to cause formation of a gas-in-liquid emulsion of the gas in the liquid, as the liquid and gas pass through the processing passage.

Abstract: The invention relates to a floating paddlewheel aerator for aerating water or clearing basins. Said paddlewheel aerator comprises a frame (1) of elongated floats (2, 3), said floats being substantially arranged at a right angle and being linked with each other in a T or H configuration. On a first float (2) further floats (3) or sections of floats are mounted on both its opposites ends. Said first float (2), on its top that is turned upwards by 90° compared to its lateral sides on which the further floats/float sections (3) are mounted, carries a drive unit (9). Said drive unit (9) is mounted completely or partially on the floats and its output shaft (10) projects on both sides and parallel to the longitudinal extension of the further floats/float sections (3).

Abstract: A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty soluble or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for rotation relative to one another and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to form a gas-in-liquid emulsion of the gas in the liquid. The liquid and gas pass through the processing passage, changing into the gas-in-liquid emulsion.

Abstract: A humidifier for providing moisture to an airstream comprises a pipe having a first end for connecting to a source of steam and a closed second end; first and second slots disposed opposite each other and longitudinally along a major portion of the length of the pipe; and a plurality of members sandwiched within the first and second slots, the members being disposed toward the interior of the pipe to guide condensate into the interior of the pipe.

Abstract: The invention is a paddlewheel aerator having a support structure, a drive mechanism contained within the support structure, a rotatable shaft extending horizontally from the drive mechanism; and a plurality of paddlewheels surrounding the shaft. A plurality of support legs are formed integrally with the support structure. In a preferred embodiment, a watertight drive box is positioned within the support structure. The drive box has a removable cover and a substantially water tight seal for preventing ingress of water. The drive box contains a motor drivably connected to the shaft. The motor is contained within an upper portion of the drive box so that the motor is positioned at a vertically elevated level compared to the shaft.

Abstract: The invention is a paddlewheel aerator comprising a support structure, a drive mechanism contained within the support structure, a rotatable shaft extending horizontally from the drive mechanism; and a plurality of paddlewheels surrounding the shaft. A plurality of support legs are formed integrally with the support structure. In a preferred embodiment, a watertight drive box is positioned within the support structure. The drive box has a removable cover and a substantially water tight seal for preventing ingress of water. The drive box contains a motor drivably connected to the shaft. The motor is contained within an upper portion of the drive box so that the motor is positioned at a vertically elevated level compared to the shaft.

Abstract: An aerator or destratifier used to provide Oxygen to standing or less active bodies of water. The aerator has a non-floating internally driven motor within a non-floating sealed drum. The drum and motor are supported by a support frame attached to floatation devices. A plurality of elliptically shaped paddles are externally affixed to the exterior surface of the non-floating drum. Rotation of the drum by the internal motor and gearbox causes rotation of the plurality of paddles affixed to the drum exterior. The plurality of paddles cause agitation of the body of water and allow Oxygen to be dissolved therein.

Abstract: An aerator or destratifier used to provide Oxygen to standing or less active bodies of water. The aerator has a non-floating internally driven motor within a non-floating sealed drum. The drum and motor are supported by a support frame attached to floatation devices.

Abstract: A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty soluble or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for rotation relative to one another and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to form a gas-in-liquid emulsion of the gas in the liquid. The liquid and gas pass through the processing passage, changing into the gas-in-liquid emulsion.

Abstract: The invention concerns a mixing and aeration unit, especially for waste water treatment and including a submersible axial flow mixer (2), an elongated jet ring (6) with inlet (6a) adjacent the mixer propeller (3) and housing a number of air bubble diffusers (10).

Abstract: Gases containing solubles or suspended particles are mixed with a scrubbing liquid in a mixing apparatus having a chamber with a rotatable wheel mounted therein. The gas is mixed with a scrubbing liquid by the rotating wheel which has first and second scrubbing surfaces including vanes for creating turbulence and moving the gas through the chamber. The vanes on the first scrubbing surface increase in height from the axis of the wheel to its periphery to move gas radially outwardly. The vanes on the second scrubbing surface increase in height from the periphery to the axis of the wheel to move the gas radially inwardly.

Abstract: A reversible housing for a humidifier of the type for attachment to the ducts of a forced air heating system. The housing includes a sheet forming a back wall, a pair of side walls and a top wall integrally hinged to the back wall and pivotable through one-half turn with respect to the latter so as to take two operative positions both protruding forwardly of the back wall depending which one of the back wall faces is disposed flat against the duct. The back wall has a central air passage opening bordered with flanges protruding from each of the back wall faces to connect with a duct opening. One of the side walls has a second air passage with flanges protruding from each of its two faces to selectively connect with a by-pass duct to the left or to the right of the housing. An angular cover and a water tray completes the housing and fit the sheet in either one of its two operative positions. A screwdriver is only required to secure the sheet in either one of its operative positions.

Abstract: A liquid management unit uses a substantially horizontal rotor device partially submerged in a liquid so that at least a portion of a rotating component or the rotor device moves a liquid above the surface of the body of water and is then collected in a container for filtering, irrigation, or other purposes. A flap may be used with the container for opening and closing the container to incoming liquid. A control device such as an endless screw, chain, or rod may be used for opening and closing the flap especially when it is located on the interior of a shroud. A flow restriction unit can also be used with the liquid management unit to provide increased velocity to incoming liquid. The flow restriction unit is formed as a U-shaped member with an open inlet and opposite open outlet end. The inlet end cross sectional area may be increased by angling the sides outward at the inlet or slanting the bottom downward from the outlet to the inlet ends.

Abstract: A liquid management unit uses a) a shaft mounted disc rotor partially submerged into a liquid for introducing flow-inducing energy and air or treatment gas into the liquid, b) a first baffle for receiving liquid from below the surface of a body of liquid and directing the liquid to the rotor, and c) a second baffle for receiving treated liquid from the rotor and directing the treated liquid below said surface of the body of liquid. The rotor and baffles may be mounted in various orientations including both horizontal and vertical positions. The disc rotor and first and second baffles are mounted on a frame that is supported by pontoons. A shroud placed over the disc rotor and input and output baffles with an air passage through them form a pressurized three-point aeration system in which the input baffle pre-aerates the water to satisfy chemical oxygen demand, the disc rotor transfers additional air to the water, and the output baffle post-aerates the water to satisfy the overall oxygen demand of the liquid.

Abstract: Gases containing solubles or suspended particles are mixed with a scrubbing liquid in a mixing apparatus having a chamber with a rotatable wheel mounted therein. The gas is mixed with a scrubbing liquid by the rotating wheel which has first and second scrubbing surfaces including vanes for creating turbulence and moving the gas through the chamber. The vanes on the first scrubbing surface increase in height from the axis of the wheel to its periphery to move gas radially outwardly. The vanes on the second scrubbing surface increase in height from the periphery to the axis of the wheel to move the gas radially inwardly.

Abstract: An apparatus for aerobic biological treatment of waste water is described, in which a great number of carrier members having a large surface area to which microorganisms adhere are movably set in a cylindrical reactor within a given range of height, and the carrier is horizontally moved substantially continuously so that a part of the carrier is cleaned with cleaning air. The partial cleaning system eliminates the disadvantages associated with intermittent cleaning of the whole carrier.

Abstract: A fragrance evaporator allows doses of fragrance to be released into the atmosphere in a controllable manner and only when required. The fragrance evaporator has a solid surface that may be wetted as required with liquid fragrance from a fragrance reservoir. An evaporation space that surrounds the solid surface and that is in communication with the atmosphere is thus created above the surface.

Abstract: An assembly comprising a wheel capable of rotating rapidly to aerosolize wastewater inside an enclosure designed for placement between a septic tank and its associated drainage area which reduces substantially the pathogenic organism content of effluent emanating from the septic tank. A source of UV light can be added inside the enclosure to further detoxify the effluent.

Abstract: A furnace humidifier uses radial air flow through a spaced stack of annular disks rotated through a water bath to provide humidification with reduced encrustation of the water carrying surfaces from minerals in the evaporating water. The disk array is followed by a damper volume providing more uniform air flow through the disk spaces better utilizing the water on their surfaces.

Abstract: An apparatus for aerobic biological treatment of waste water, in which a great number of carrier members having a large surface area to which microorganisms adhere are movably set in a cylindrical reactor within a given range of height, and the carrier is horizontally moved substantially continuously so that a part of the carrier is cleaned with cleaning air. The partial cleaning system eliminates the disadvantages associated with intermittent cleaning of the whole carrier.

Abstract: A humidifier is constructed from basic units that have a rigid part supporting a hydrophilic part. A lower portion of a basic unit is disposed in a water-filled canal, and the upper portion is exposed to air, especially heated air from a heater. One embodiment is adapted for placement over a floor outlet for heated air to evaporate water from the canal into the heated air to increase the humidity thereof. This embodiment may be above or just below floor level. Various forms of covers are associated with the units. The humidifier may take the form of an ornamental replica of a windmill having hydrophilic material on rotating blades that dip into a water reservoir, and having a fan inside that blows air onto such material.

Abstract: Provided is an improved disk oxygenator having a hollow median longitudinal shaft with a plurality of orifices to allow oxygen to be diffused radially through a cylindrical reservoir. Also provided is a disk oxygenator with a hollow longitudinal shaft comprised of a series of disks. The disks are provided with a central annular cylindrical passageway.

Abstract: An air purifying and moistening device comprises a suction section having an air entrance opening, filter means at said opening and a motor-driven fan, an air purifying section including at least an ultraviolet radiation sterilization lamp, and a water ducting section within which the sterilized air is brought into contact with the water surface before it is discharged into the room. The water supply is a water trough or water tray with a large surface area of substantially stagnant water volume, which trough or tray is covered with a removable cover plate at a distance above the water surface. A casing forms a substantially closed air passage channel part of which is formed within said housing and another part of which is formed by the water surface, the lateral walls of the trough and the cover plate above said water surface.

Abstract: A media panel for a rotating biological treatment apparatus for treating waste water, the rotating biological treatment apparatus including a rotatable shaft having a longitudinal axis and a plurality of media panel assemblies stacked on the shaft and each including a hub mounted on the shaft and a plurality of media panels mounted on the hub, the media panel comprising a planar member having a first side and a second side, and the planar member being mountable on the hub to extend normal to the longitudinal axis of the shaft to form a portion of a generally disk-shaped media panel assembly extending normal to the longitudinal axis of the shaft; the first side of the planar member including at least one first set of alternating grooves and ridges, and the second side of the media panel including at least one second set of alternating grooves and ridges; the grooves and ridges of the first and second sets of alternating grooves and ridges each having a first radially inner portion, a second radially inner port

Abstract: Self-propelled mobile apparatus for aerating water includes a vessel configured for movement across a body of water, and a mechanism contained entirely on the vessel for propelling the vessel across a body of water. A water aerating device is disposed on the vessel for aerating water as the vessel is propelled across a body of water.A method of aerating a body of water includes placing an entirely self-propelled vessel on a body of water to be aerated, propelling the self-propelled vessel across the body of water, and activating an aeration device disposed on the vessel.

Abstract: The present invention is directed to a closed cycle aquaculture system for fish rearing which includes as part of a water treatment subsystem a rotating biological contactor. The contactor nitrifies the contaminated water to remove toxic materials therefrom and also can be operated to maintain the temperature of the water near the wet-bulb temperature of the surrounding air when desirable.

Abstract: A waste gas scrubber utilizing a liquid body within an enclosure. The enclosure forms a chamber to confine the body of liquid to a portion of the chamber. A rotatable member includes an inside and an peripheral portion and possesses a multiplicity of passages extending from the inside portion to the peripheral portion. A stator surrounds the rotatable member and forms a channel between itself and the stator. The stator includes the first opening communicating with the body of liquid, permitting liquid to pass to the peripheral portion of the rotatable member, and into the channel between the stator and the peripheral portion of the rotatable member. The stator includes a second opening to the liquid body in the chamber. Waste gases traveling through the rotatable member are purified by turbulent contact with liquid forced into the channel. The purified gases are then led from the chamber to the outside environment.

Abstract: An improved exhaust gas muffler for diesel engines comprises a housing of generally oval shaped cross-chamber, a partition plate disposed therein dividing the housing into an upper chamber and a lower chamber, a first and second generally cylindrical filters rotatably secured within respective lower and upper chambers of the housing, an external rotation means such as an electric motor enabling the rotation of the first and second filters, and a quantity of alkaline cleaning fluid partially filling the lower chamber of the housing and partially immersing a lower portion of the first filter. Wherein, exhaust gas enters the lower chamber of the housing through an inlet and passes through an asbestos sleeve of the first filter permeated with cleaning fluid, which removes carbon precipitates from the exhaust gas.

Abstract: A humidifier includes a rotating circular base plate driven by a motor through a gear reduction mechanism. A plurality of elongated troughs are mounted in a spaced circular array adjacent a periphery of the base plate, such that outer edges of the troughs are disposed on the surface of a cylinder. The troughs may have a variety of different transverse cross-sectional shapes, such as semi-circular, U-shaped, or V-shaped. A centrally disposed drive shaft extends axially from the base plate and includes a plurality of radially extending circumferentially spaced fins. The rotating base plate and attached troughs are mounted in a housing having an inlet duct and an outlet duct connected in a cold air return duct of a conventional forced air type furnace. A water tank disposed in the bottom of the housing is connected by a float valve to a water supply source such that a constant water level is maintained in the tank.

Abstract: A fluid mixer for submerging within a body of liquid to transfer and mix the fluid in the body of liquid. The mixer does not draw liquid through an opening and has no sharp corners so debris within the body of liquid cannot plug the mixer. The apparatus comprises a rotatable shaft with a hollow passage and a fluid intake to the hollow passage. An impeller is attached to the end of the shaft. The impeller has two circular discs, substantially the same diameter. The discs are coaxial with the shaft and have a space therebetween. The hollow passage within the shaft is in communication with the space between the discs. A plurality of impeller blades are spaced apart about the impeller and extend outwards from the space between the discs.

Abstract: There is disclosed a paddlewheel aerator drive mechanism in an electric motor powered float mounted paddlewheel aerator for fish farms or similar applications, including a rugged lightweight frame with foam flotation elements and a rotatable multi-paddle rotor at least about three feet in diameter with the paddle rotation path extending substantially below the water line. One end of its shaft is secured in the wall of a substantially water tight drive box assembly. Extending into the drive box assembly parallel to and generally opposite the paddlewheel rotor shaft is a shaft of an electric motor, also mounted on the frame.

Abstract: In froth flotation apparatus for separating solid particle impurities from a liquid suspension stock in a flotation cell, provision is made for aerating the stock flowing through the inlet conduit leading to the cell by positioning a drum-shaped rotor having an irregular outer surface in the conduit on an axis extending transversely of the conduit, directing a supply of air against the rotor surface on the upstream side of its rotational axis, and causing the rotor to rotate at a linear speed of its outer surface which is substantially higher than the linear flow rate of the stock in the conduit so that the rotor surface breaks up the air impinging thereon into bubbles and distributes those bubbles in the stock flowing therepast to create foam within the cell.

Abstract: Arrangement for cleaning of waste water by application of rotating biocontactors utilizing tubular biocontactors open at both ends wound on a rotating cylindrical frame adapted to be alternatively submerged below and raised above the level of the waste water, combining thereby the effect of cleaning by biocontact and of efficient aeration of the waste water.

Abstract: An apparatus for aerating fish ponds utilizes a cylindrical brush mounted for rotary motion below the top of a dam or headwall. Water passing over the dam and falling into a fish pond below the dam falls onto and over the cylindrical brush causing the brush to rotate. The rotating brush breaks up the falling water into droplets as the water passes through the brush bristles. Below the rotating brush, the water droplets fall through an air-water mixing zone where atmospheric oxygen is dissolved by the water droplets thus increasing the dissolved oxygen concentration of the water.

Abstract: A gas desulfurization apparatus is disclosed. The apparatus includes a cylinder casing containing a number of rotating cylinders. Secured to each end of the rotating cylinders is a circular end plate, and within each of the cylinders is fill material having voids or cavities thereon. A desulfuring slurry reservoir is located in the base of the cylinder casing and a waste slurry pit is similarly connected the casing. A lifter is associated with each of the rotating cylinders and is arranged so that, as the cylinders rotate, a quantity of desulfuring slurry from the slurry reservoir is transferred into the associated rotating cylinder.

Abstract: A heat recovery unit for use to preheat fresh air with hot air produced in an industrial process, such as the hot air exhaust from a dryer of a pulp and paper mill. The recovery unit makes use of water circulating from one air/water heat exchanger tank to another air/water heat exchanger tank as heat transfer medium. Hot air whose heat is to be recovered at least in part, flows past a set of revolving discs of metal partially immersed in the water flowing in one of the heat exchanger tanks. The portions of the discs which are exposed to the hot air above the water level transfer the heat they recover to the flowing water. The water which is so heated passes into the other heat exchanger tank where it raises the temperature of an identical set of revolving discs which in turn heats a fresh air intake to provide warm air. The main advantage of this recovery unit is that the heat recovery conditions can be easily adjusted to fit any seasonal fresh air change.

Abstract: A water warming apparatus generates hot air bubbles by drawing and discharging a water in a water tank by a rotary body and plunging the water so drawn into the water together with a hot air introduced in a hot air chamber so as to cause direct heat exchange to be conducted and thereby make the water warm very quickly.

Abstract: A aeration device designed for use in catfish ponds has a support base on which an electric motor and a gear reduction unit are mounted. A cylindrical hub attached for rotation with an output shaft of the gear reduction unit has four evenly spaced radially extending rods. A hollow cylindrical cup is mounted transversely on the free end of each of the rods. The openings of each cup face in the same rotational direction. Four brace struts extend between the radially extending rods, forming a square. In use, the supporting base is situated in a catfish pond, with the motor and gear reduction unit disposed above the water level. At the extreme downward position, each cup will extend about two feet below the water line. As each cup passes through the water, the cup is filled with water which is then carried around a circular arc and dumped from the cup as the cup moves around the arc back toward the surface of the water. In this manner, the water is splashed and aerated before being returned to the water.