Abstract: A mixing device for mixing at least two liquids to produce a homogenous mixture. The device includes an elongated chamber in which a vertically oriented elongated mixing cavity is located. The cavity is sealed at its lower end and it is open at its upper end and in communication with the interior of the chamber. An elongated conduit extends the length of the cavity and is adapted to receive liquids to be mixed. The conduit includes a plurality of ports located at longitudinally spaced positions therealong and which ports are directed in different directions. The ports create plural streams of liquid which interact and mix with one another within the cavity. The mixed liquids overflow the cavity and out its top end into the chamber 24. The chamber 24 includes an outlet from which the mixed liquids are withdrawn. In accordance with the preferred embodiment gas eductor means are provided in the inlet to the conduit to introduce gas bubbles within the cavity.

Abstract: An aerator nozzle and system for aerating a body of liquid which includes a combined air and liquid discharge nozzle unit respectively supplied from an air compressor and a liquid pump wherein the nozzle unit includes a liquid discharge nozzle with an air dispersing nozzle therewithin to insure maximum air absorption into the body of liquid to be aerated.

Abstract: A barriered pump/aerator, for continuously moving and aerating mixed liquor having translational-flow momentum within an endless channel of a barrier oxidation ditch, conserves at least a portion of the momentum by enabling induced flow of the mixed liquor past the barrier. In one embodiment, the induced flow passes through a discharge slot which contains a plurality of jet aerators. In another embodiment, the induced flow passes through a trough formed in the bottom of the endless channel past an inclined baffle. In a third embodiment, the induced flow passes through a tubular passage having a plurality of jet aerators disposed therein.

Abstract: An aspirating horizontal mixer for aerating and liquid mixing includes a float with tiltable supports extending downwardly into a body of water and an air delivery conduit which are connected to a mixer unit supported below the liquid surface by the supports and tiltable therewith. The mixer unit includes a submersible motor powering a propeller and a nozzle member situated in the flow path of liquid from the propeller. The nozzle member has an internal venturi for mixing air from the air delivery conduit with the liquid flowing therethrough and includes a converging wall formation forming a constriction and a diverging wall formation leading downstream and merging with the interior wall of the nozzle member. An air injection port extends through the diverging wall formation adjacent the constriction and is in communication with the air delivery conduit for mixing air with the liquid as it flows through the venturi.

Abstract: To convert a conventional nonpulsating air/water mixer for a therapy tub, swimming pool, spa or the like to a pulsating mixer, an inexpensive pulsator fitting is used to replace the central eyeball portion of the mixer's outlet and mounting fitting. The pulsator fitting has at least one cross bar positioned to block the mixer's aerated water jet, and a small cylindrical rotor journaled on the cross bar. The rotor extends from the cross bar coaxially into the mixer body's outlet passage in the path of the aerated jet. The jet strikes a central portion of the upstream rotor end, travels through an angulated rotor passage, and exits the downstream rotor end at an angle relative to the rotor axis and at a point spaced apart from it, causing the rotor to spin. As the rotor spins, the exiting aerated jet rotates and is repetitively and intermittently blocked by the cross bar, thereby pulsing the jet.

Abstract: A method and device for the in-line dispersion transfer of a gas flow into a liquid flow for dispersing and diffusing ambient air and/or other oxident gas or gases into a filtrate or other liquid flow, such as water, and at supersaturation rates, to provide for oxidation treatment of the contaminents or other undesirable materials in the liquid, for chemical free, water purification purposes, in which the device involved is free of moving parts and comprises a T-fitting body defining in-line liquid inflow and outflow ends and a mounting section intermediate such ends, with the fitting body mounting between its said ends thereof a standpipe at the mounting section of same with the standpipe being exposed to a source of the gas to be dispersed into the liquid flow, and with the fitting body and the standpipe comprising an assembly for dispersing the gas into the liquid flow including Venturi action means for dispersing or diffusing the gas in the liquid, induced by the kinetic energy of the liquid flow through

Abstract: There is disclosed an apparatus for effecting a chemical reaction. There is provided an aspirator-mixer or zone to which the reaction mass is pumped to activate the same and into which another reactant is furnished and from which admixed reaction mass and reactant are discharged into a reaction zone in which the concentration or proportion of a vaporous or gaseous reactant is maintained at a level as desired by sucking therefrom into the suction side of the aspirator-mixer or zone any excess of such reactant. In one embodiment, a mercaptan is oxidized to corresponding disulfides with oxygen and the oxygen level in the reaction zone is maintained as desired by sucking off into the suction side of the aspirator-mixer any oxygen in the reaction zone in excess of that desired therein.

Abstract: A fluid of lower density is dispersed in a jet of a fluid of higher density, by imposing on the jet of higher density a curved trajectory. Where the pressure is the highest, that is, where the wall that establishes the curved trajectory has its largest radius of curvature, the fluid of lower density is introduced, preferably under pressure. The apparatus can be embodied as a tuyere which is a figure of rotation, when only a relatively small proportion of lower density fluid is to be introduced. When the proportion of lower density fluid is greater, however, then the device can be embodied as a duct of quadrangular section wrapped in a helix with narrow slots for the introduction of the fluid of lower density formed in its outer wall.

Abstract: An apparatus for aerating well water in a home water system includes a pressure tank situated above the water in the ground well, means for delivering water from the well to the pressure tank under pressure, an aerator including a pipe tee having a vertical passage therethrough and a horizontal passage open to the vertical passage, a water inlet pipe open from below the water line in the pressure tank to the top of the vertical aerator passageway, a turbulation flow pipe open from the bottom of the aerator vertical passage to the well and terminating above the level of the water in the well. The horizontal passage is open to the atmosphere. The pipe tee supports a mixing plug made of silver solder which is in sealing relation to the water inlet pipe and terminates in line with the horizontal pipe tee passage. The plug has at least one relatively narrow, straight line opening through it for the discharge of water from the pressure tank into the pipe tee.

Abstract: The injector apparatus is of the kind having a constriction which lies, in the flow direction, immediately before a following adjoining mixing section, in which fibrous stock suspension is mixed with air for the purpose of subjecting the suspension to flotation in a flotation tank. The mixing pipe in which the mixing section is disposed has a radial diffusor at its outlet end, and, for a greater flow rate of air, additional air intake bores are disposed therein a short distance in the flow direction after the constriction.A favorable arrangement is achieved if the injector apparatus with the mixing pipe is arranged perpendicularly in a flotation tank, which may have the form of a reclining cylinder. In this case, the froth, like the cleaned suspension, is drawn off on one long side, i.e., a side which extends parallel to the cylinder axis; the extraction opening for the cleaned suspension being provided preferably immediately below the level of the suspension and/or the froth extraction arrangement.

Abstract: A treatment system for liquids includes apparatus for dissolving gas in the liquid and a container for providing the necessary reaction time between the gas and the liquid or constituents thereof. The device for dissolving the gas in the liquid includes gas injection means for introducing gas into the liquid and a contact chamber for containing a downflowing stream of the liquid to be treated. The pressure within the downflowing stream increases as it descends and at the elevated pressure the capacity of the liquid to take gas into solution is greatly increased. This apparatus for dissolving gas may conveniently be located below ground level. A conduit return means is provided for routing undissolved gas from a region at high pressure to an upstream portion of the liquid stream so that the gas can be reintroduced for dissolution.

Abstract: This invention provides for a system for the year-round aeration of lagoons, ponds, small lakes and the like, providing greatly improved circulation and saturation of effluent with dissolved oxygen, further providing advantages of portability and remote location of inlet, discharge and pump; and utilizing a device incorporating internal baffles within an adjustably inclined chute incorporating covers and discharge extension and movable mounted upon a suitable vehicle.

Abstract: A treatment system for liquids includes apparatus for dissolving gas in the liquid and a container for providing the necessary reaction time between the gas and liquid or constituents thereof. The device for dissolving the gas in the liquid includes gas injection means for introducing gas into the liquid and a contact chamber for containing a downflowing stream of the liquid to be treated. The pressure within the downflowing stream increases as it descends and at the elevated pressure the capacity of the liquid to take gas into solution is greatly increased. This apparatus for dissolving gas may conveniently be located below ground level. A conduit return means is provided for routing undissolved gas from a region at high pressure to an upstream portion of the liquid stream so that the gas can be reintroduced for dissolution.

Abstract: A hand-held apparatus for spraying foam comprises (a) a manually-operated dispensing pump capable of receiving a foamable liquid from a suitable container and ejecting it into the atmosphere through an atomizing nozzle, thereby forming a spray from such liquid and projecting it outwardly from the nozzle in a predetermined spray pattern, and (b) foam-forming device including an air inlet and a screen retained in the path of the spray. The screen can be retained in a foam-forming position by suitable means such as a housing operatively associated with the dispensing pump. Substantially all the spray passes through the foam-forming device without contact except by the screen, thereby generating foam with little modification of the predetermined spray pattern.

Abstract: An aeration device for use in a swimming pool system wherein a pump draws water from a lower portion of a body of water through a filter and returns it to the body of water via a return conduit, and comprises a tubular aeration member positioned adjacent to a conduit to the pump, and extending above the water line, thus to admix atmospheric air with water drawn by the pump via the conduit from the lower portion of the body of water. A flexible hose preferably extends into the body of water and is connected with the pump via a return conduit, and the hose is moved about and supported under the action of aerated water passing therethrough to spread aerated water through the body of water.

Abstract: A hydrotherapy jet unit used singly or in multiples for jetting pressurized water and air under submerged conditions into a water-bearing vessel, and provided with a means to fix the direction of jetted flow at an optimum angle not susceptible to change or alteration by the vessel user; however, each unit being readily adaptable to provide directional jetted flows at differing fixed angles by means of removable and interchangeable deflection nozzles. The unit features both water and air supply pipes entering the hydrotherapy jet housing at its rear extremity, said pipes being substantially parallel to each other and axially aligned with the jet action produced within the unit. This arrangement provides a means for simple removal and replacement of the unit if required without need to damage, alter or reconfigure pipe means supplying either water or air.

Abstract: A barriered circulator/aerator in the endless channel of a barrier oxidation ditch provides a directly pumped flow of mixed liquor into a central liquor inlet zone and an energy-release induced flow of mixed liquor into a surrounding liquor inlet zone at the inlet of a deep oxygen contact duct which passes beneath the barrier to the discharge channel on the downstream side thereof. It further provides mixing of diffused air with the directly pumped flow and/or the induced flow and then moving the combined air-liquor flows into the deepest portion of the contact duct where point-source pressurized aeration of both flows occurs. Eddy jet diffusers are preferably used for aerating the induced flow. Oxygen transfer efficiencies are obtained that are 1.6-2.2 times as great per brake horsepower per hour as that attainable by 100% pumping of the mixed liquor in a total barrier oxidation ditch, as disclosed in U.S. Pat. No. 4,260,278.

Abstract: Liquid is circulated from bottom to top in a pressure tank by means of a gas pump including an upstanding pipe located within the tank and up through which gas is pumped at a pressure exceeding tank pressure to carry liquid which enters the pipe at the bottom up to the top of the tank.

Abstract: An aeration device for introducing air into a pool of water. The device basically comprises a cylindrically shaped main body portion and a retaining ring for pivotally securing a generally spherically shaped water direction spout within a portion of the main body. The main body has a hollow interior. One end of the main body terminates in a threaded portion adapted to be received in a conventional water supply port found in the wall of the pool. A tube has one end in fluid communication with the spout and the other end exposed to ambient air. As water passes from the water supply port through the water direction spout, a suction is created, drawing air through the tube and into the flow stream of the water for introduction into the pool.

Abstract: The apparatus comprises a vertical tubular column having a lower inlet connected to a pump and an upper outlet, a deflector of inverted-cone shape and extending through the outlet coaxially with the column a threaded shank rigid with the deflector for adjusting the axial position thereof relatively to the column, and a laminating plate coaxially located above the deflector and provided with a central opening communicating with an axial gas intake conduit.

Abstract: A method and an apparatus for dissolving gas in a body of sewage comprising providing a skirt member having a lower open end extending upwardly from said body of sewage to define a volume of said sewage separate from an adjacent body of clarified liquid in said tank, removing a flow of sewage from said body of sewage and pressuring said flow, introducing oxygen into said pressurized flow to form a mixture of oxygen and sewage, introducing said mixture as a jet downwardly into the inlet of a chamber disposed in said volume defined by said skirt member to induce sewage in said chamber and thereby oxygenate said sewage, discharging said oxygenated sewage downwardly through an outlet of said chamber at a reduced velocity, and reducing the momentum of said discharged oxygenated sewage by directing the same onto baffles spaced from the outlet of said chamber.

Abstract: A horizontal mixing aerator rides on an upright beam member for submersion in a body of water such as an equalization basin, oxidation ditch, or sludge holding tank. The aerator employs a submersible mixer motor driving a propeller which in one embodiment is mounted on the beam member by a slidable bracket for height adjustment. The bracket is also swingably mounted to the beam member for adjustment of the vertical plane angle. Because the beam member is also mounted for rotation, substantially any attitude or position of the mixer can be selected for creating an efficient flow pattern within the body of water. Air or fluid injection can also be provided by the use of alternate embodiments.

Abstract: A method for agitating and mixing a gas with a medium in a closed fermentation vessel comprising recirculating said medium through a venturi jet mixer whereby it is mixed with the gas under high shear conditions to form a mixture of gas saturated medium and a dispersion of small gas bubbles and projected the mixture in the fermentation vessel below the liquid surface level in a plume extending horizontally from the jet mixer, then rising vertically to the liquid surface.

Abstract: A fill valve, or aspirator, which is adapted to be connected to a superatmospheric pressure source, such as helium, and which is capable of intermixing at least two fluids in intimate fashion, wherein in one embodiment, actuation of a slide-like member allows introduction of a second fluid, for example, ambient atmosphere, so that ambient atmosphere is drawn into the fill valve by reason of a venturi effect due to the interior configuration of the fill valve so that an air and helium mixture may be obtained. The fill valve ideally, in the most efficacious embodiment may be utilized for filling inflatable members with a combination of air and helium so as to decrease the cost of the fluid for inflating the inflatable article.

Abstract: A sewage disposal plant comprising a deep-well type sewage treatment tank, which is provided with string-shaped contact members stretched therein, and which minimizes the installation area; a circulator pipe inserted into the sewage treatment tank and having a venturi portion at an intermediate section thereof; and an air intake pipe inserted into the circulator pipe extending into the venturi portion thereof, whereby exposure air can be sucked into the venturi portion of the circulator pipe naturally without using a compressor, thus saving power. Said string-shaped contact members has therearound ring type fuzzy hairs consisting of fibers.

Abstract: An aerator (2) comprises a motor (10) having a propeller (18). A slotted cage (30) surrounds propeller (18) and prevents marine life from being drawn in to propeller (18). Liquid will be ejected from propeller (18) in a horizontally traveling stream which stream is oxygenated by a draft tube (48) having a lower end located adjacent propeller (18). Slotted cage (30) is carried on a support rod (68) to form the structure for supporting aerator (2) in tank (4). Cage (30) prevents marine life from being drawn into the propeller (18) as it is driven.

Abstract: A sewerage aerator is illustrated having an air feed diffuser with air opening adjustably positioned approximate venturi throat located above the liquid sewerage tank level and having means to introduce the liquid sewerage to the upper venturi chamber and cause it to flow past the air openings.

Abstract: A device for removing solid impurities from air comprising a housing defining an interior mixing chamber. The solid impurity laden air is conducted to the mixing chamber so that the air enters the chamber in a first direction. Simultaneously, water is pumped into the mixing chamber in a direction substantially perpendicular to the air flow whereupon the air and water become intermixed. A second pump then pumps this mixture into a settling tank so that the solid impurities collect in the bottom of the tank for subsequent removal.

Abstract: An ozone generator is formed by a plurality of concentric tubular plate members forming positive and negative electrodes which are interleaved with each other. A high voltage discharge is applied from a transformer between the electrodes to cause an electric discharge in the air contained therebetween, thereby generating a supply of ozone. The air is fed to a suction nozzle device through which a water stream to be purified passes. The suction nozzle is constructed so that the water stream is markedly speeded up so as to generate a partial vacuum in an air pocket formed between the water stream and the inner walls of the nozzle. The ozone, which is fed to the nozzle in the region where this air pocket is formed, is thus sucked into the nozzle and efficiently injected into the water stream, thereby effecting the purifying action.

Abstract: A hydrotherapy jet unit used singly or in multiples for jetting pressurized water and air under submerged conditions into a water-bearing vessel, and provided with a means to fix the direction of jetted flow at an optimum angle not susceptible to change of alteration by the vessel user; however, each unit being readily adaptable to provide directional jetted flows at differing fixed angles by means of removable and interchangeable deflection nozzles. The unit features both water and air supply pipes entering the hydrotherapy jet housing at its rear extremity, said pipes being substantially parallel to each other and axially aligned with the jet action produced within the unit. This arrangement provides a means for simple removal and replacement of the unit if required without need to damage, alter or reconfigure pipe means supplying either water or air.

Abstract: Ammonium orthophosphate products are prepared by reacting ammonia and phosphoric acid together at high speed under vigorous mixing conditions by spraying the reactants through a two-phase, dual coaxial mixer/sprayer and separately controlling the supply and axial outflow rate of the phosphoric acid at 1 to 10 m/sec. and the outflow rate of ammonia at 200 to 1000 m/sec. (N.T.P.). Thorough mixing and a homogeneous product is obtained by directing the outflow spray into a coaxial cylindrical reaction chamber of a specified size with respect to the diameter of the outermost duct of the sprayer/mixer. The product may be granulated on a moving bed of granules and adjusted in respect of the NH.sub.3 to H.sub.3 PO.sub.4 content by changing the concentration of the phosphoric acid and/or supplying additional ammonia to the granulation bed.

Abstract: A dam spillway for the passage of water from a forebay to an afterbay comprises a means for compressing the atmospheric air by the passing water and a floatation chamber connected to said means. The floatation chamber incorporates a froth separating cavity having a lower wall thereof in the form of a smooth concave curve. Accommodated in the upper portion of the froth separating cavity substantially above the water level of the afterbay is a froth remover in the form of a tubular member provided with a longitudinal slot facing the interior of the cavity. Secured on the froth remover is an assembly of water sprinkling froth suppressing sprayers adapted to communicate with the forebay. Connected to the upper portion of the froth remover adjacent to the sprayer assembly are perforated air ducts secured at the bottom of the afterbay.

Abstract: An improved molten metal pump and gas injection apparatus comprising a submersible pump housing 10 enclosing a rotatable impeller 30, an impeller drive 12 supported above the housing and an elongate drive shaft 16 operatively connected to the impeller. Rotation of the drive shaft effects fluid flow between a pump inlet 35 and a pump outlet 44 both being at least partially defined by the impeller housing. A gas injection conduit 54 extends downwardly from a drive motor support platform 20 and includes an output end 54a that terminates near the pump inlet and which is received by a gas inlet collar 58 that defines a venturi 60, coaxial with the axis of the pump inlet. A passage 62 formed in the collar communicates the end of the gas injection conduit with the throat of the venturi so that the gas is injected into the incoming molten metal in an area of low pressure, thereby reducing the gas pressure needed to effect injection.

Abstract: A water-aeration apparatus has a tubular frame defining a substantially closed chamber and capable of floating and carrying a load when the chamber is filled with air. Flood and bleed valves are provided at respective underwater water intakes and above-water air exhausts for introducing water into the chamber and for withdrawing air therefrom. A double-walled conduit is supported on the frame and has an outer substantially gas-impervious wall and, spaced inwardly therefrom, an inner gas-pervious wall. The conduit is inclined to the horizontal when the frame is floating and has an upper conduit end and a lower conduit end. A pump carried on the frame has an air intake above the water when the frame is floating and an air output at the lower end and directed toward the upper end.

Abstract: Flotation apparatus for de-inking of pulp suspension in a flotation cell with injectors for feeding the pulp suspension into the cell and for aerating the pulp suspension. The injectors are equipped with wide slot nozzles through which the suspension flows having a ratio of cross-sectional area to periphery of between 1.5 mm and 4.0 mm. A mixing chamber receiving pulp suspension flow from the wide slot nozzles is provided having a cross-sectional area which is between 1.3 to 1.7 times the cross-sectional area of the wide slot nozzles.

Abstract: A gas-liquid mixing process and apparatus, particularly applied to aeration, especially associated with activated sludge waste-water treatment, wherein complete, efficient mixing of the gas and liquid is achieved initially in a pre-mixing draft tube and secondly in an outer mixing vessel by imparting a turbulent, random generally outward and upward radial motion to the liquid and gas contents of the vessel. A portion of the contents of the vessel is withdrawn and recirculated through the pre-mixing draft tube substantially axially vertically situated within the outer mixing vessel. A lower end of the draft tube has a nozzle opening which produces a net flow which is an axially symmetrical radial jet of recirculating contents, thereby establishing the desired turbulent random motion. In the case of aeration in waste-water treatment, air or other oxygen-containing gas is introduced into the draft tube.

Abstract: An in-line contactor adapted to bring about intimate contact between a disinfectant and a wastewater stream to produce a reaction between the disinfectant and pathogens effecting kills in a manner minimizing unwanted side effects. The wastewater stream is pumped through the successive stages of the contactor, the first of which is an input section having a converging nozzle that projects the stream at high velocity into a throat. The throat feeds the stream in a highly turbulent state through a mixing section, the resultant vacuum created within the throat acting to draw a disinfectant such as aqueous or gaseous chlorine from a disinfectant supply into the mixing section where it is thoroughly intermingled with the turbulent stream before the stream is discharged from the contactor through a diverging pressure-recovery output section.

Abstract: There is disclosed a novel nozzle assembly comprised of a tapered liquid passageway and a tapered gas passageway of diminishing cross-sectional areas disposed at an angle of from 0.degree. to 90.degree. to one another meeting at the enlarged end of a gas-liquid mixture passageway of diminishing cross-sectional area to an outlet end thereof. Accordingly, separate streams of a pressured gas and a pressurized liquid are introduced into the respective gas and liquid conduits whereby the gas and liquid are accelerated to a high velocity while minimizing velocity head loss and admixed at converging angles to achieve immediate high forward velocity and thus gas-liquid dispersion with the resulting gas-liquid mixture being subsequently accelerated with minimum pressure losses to achieve further gas-liquid dispersion and thus, microbubble production from controlled volumes of gas and liquid.

Abstract: Intimate and efficient contacting of plural, physically disparate phases, e.g., a gas and a liquid, is achieved by contacting the phases cocurrently in a column. The gas phase is introduced at a velocity between its phase transition inversion point (T) and multiple critical point (M.sub.c) velocities, which velocity is sufficient to create a dispersion of the second phase, i.e., the liquid phase, in the gas and thereby establish at most the following zones, from bottom to top, in the column: a bottom zone of constant liquid concentration designated the emulsion zone, a zone of decreasing liquid concentration, and a zone of constant liquid concentration wherein the liquid exists in the form of droplets. The feed velocity of the liquid is adjusted accordingly to provide a mass liquid concentration value in the emulsion that is between the mass liquid concentration value transition inversion point and multiple critical point values.

Abstract: An aerator which is attached to a water faucet includes a flow control disc at its upstream end for providing a restricted water passageway and includes air passage means for directing atmospheric air at the stream of water to mix the air and water at the upstream end of the aerator.

Abstract: A surface aerating rotor has an intake zone for circulating and aerating a liquid, and includes a supporting assembly, a driving shaft connected to the supporting assembly, fixed flow guidance devices disposed in the intake zone of the rotor, and a plurality of fluid throughput units. Each fluid throughput unit has a discharge opening, and includes a vane which has an adjustable discharge angle with respect to the radial direction, and at least one flow guide wall. At least some of the fluid throughput units include an extension member downstream of the discharge opening, a flow guide profile on the extension member, and a baffle downstream of the flow guide profile. Connecting pins join the fluid throughput units to the supporting assembly, for adjustment of the vane discharge angle within a predetermined range.

Abstract: A venturi type mixer that produces an aerated water jet for spas, therapy pools, swimming pools and the like, is provided with a pulsating action by means of a flow impeding spoiler that momentarily and repetitively disturbs the water jet that is projected into the mixing chamber. Disturbance of the jet effectively disables the vacuum produced by the venturi action to thereby cause discharge of a water stream of decreased velocity having considerably less entrained air. The spoiler is moved into and out of the water jet by means of an automatically reciprocating piston that is operated by a combination of a spring and the vacuum produced by the venturi action. Alternatively the spoiler may be rotated into and out of the path of the jet by a water driven rotor, or the jet orifice may be rotated relative to a fixed spoiler.

Abstract: A radial injector having a rotational disk through which gases are aspirated from the atmosphere and mixed with a fluid contacting the disk at the other side thereof. The disk is defining a ring slot by cooperating with a flange portion of the housing. Upon rotation of the disk, the fluid is accelerated towards the periphery of the disk thereby developing an undertow in the ring slot. Consequently gases are aspirated and injected into the fluid.

Abstract: A disinfectant system for intermingling a disinfectant with an effluent to be treated, such as wastewater, to kill pathogens therein, the system enhancing contact between the effluent and the disinfectant to effect a rapid and efficient disinfection action. The system includes an ejector through which a minor portion of the effluent is pumped to produce a motive fluid which induces a disinfectant therein to produce a concentrated disinfectant fluid. Th ejector terminates in a cylindrical diffuser section having a closed end and at least two circumferential series of orifices whereby the disinfectant fluid is discharged therefrom as high velocity jets which project radially with respect to the longitudinal axis of the section.

Abstract: A device for aerating lakes, the main part of which is an elongate casing having a longitudinal water passage through it. Between the inlet and outlet of this passage there is a frusto-conical segment converging to a restricted outlet opening and a cylindrical barrel segment spaced downstream of, and in axial alignment with, the frusto-conical segment. Surrounding and including the axial space between the frusto-conical and cylindrical segments is a mixing chamber having a pair of air intake openings to which air hoses are attached. A straight tubular nozzle is attached to the casing at its outlet end, which nozzle has a unique beveled configuration at its discharge end and a pair of apertures through its wall. The device is positioned underwater for use with the air hoses from the mixing chamber in communication with the atmosphere. A submersible pump forces water into the casing which emerges as a jet stream from the restricted opening in its frusto-conical segment.

Abstract: In an apparatus for mixing gases with and dissolving gases in bodies of liquid there is an axial-flow pump impeller (22), which is arranged to raise the liquid through a substantially vertical riser line (20) whose lower end exhibits an inlet (15) for the liquid and whose upper end forms an outlet (11) for the pumped liquid and is defined by guide surfaces (7) arranged to deflect the liquid radially from the axis of the riser line (20), the drive shaft (4) of the impeller extending coaxially with the riser line from a drive unit, located above the said body of liquid, to the impeller (22), the improvement in which the drive shaft (4) is enclosed by a stationary line (16) whose inner wall together with the drive shaft (4) defines a gas-communication passage (17) whose lower end discharges into the riser line (20) via at least one outflow passage (19) directed substantially radially to the general center line, said gas-communication passage openly communicating with a gas source, such as the surrounding atmosph

Abstract: A removable light-weight, apparatus for the aeration of a body of water or other liquid in a tank or a pool having a submerged liquid source or inlet port supplying a continuous or a sporadic stream of liquid into said tank, said aeration apparatus comprising an air induction tube extending between and communicating at its upper and lower ends respectively with the ambient atmosphere and the liquid stream, and support means for said tube, the reduced pressure along the stream of liquid drawing air from the atmosphere into the liquid in the tank. A conduit may be provided coupled to the outlet of the liquid inlet port, the lower end of said air induction tube being inserted through the tubular wall of said conduit so as to permit the air in the lower end of the air induction tube to communicate with the liquid moving through the conduit, said conduit preferably terminating in a filter or a diffuser.

Abstract: Arrangement for sucking-off gases, creating by means of water supplied to an annular nozzle surrounding the outlet of a gas conduit and forming a first hydraulic pump with a vortex, thereby mixing the gas and water thoroughly and sucking off the mixture by a second annular water nozzle into an ejector or second pump extending into a diffuser which terminates below the level of water in a vessel, where separation of the gas and water takes place.

Abstract: Apparatus for supplying air into a liquid can be used as an aeration apparatus for a biochemical waste water treatment system operating according to an activated sludge process, for example, or as an air bubble generator to be used in a solid particle flotation system. A liquid in a tank is circulated by a pump. An air intake device is disposed in a suction pipe connected to the pump. The air withdrawn by the air intake device is mixed and agitated with the liquid in the pump, whereby minute air bubbles are distributed throughout the liquid. The liquid containing air bubbles is fed from the pump to an injector disposed within the tank, and ejected thereby into the tank in the form of jet water streams.

Abstract: Apparatus for cultivating aerobic microorganisms is provided which comprises cell multiplying compartment and cell ripening compartment. The invention also provides a cultivation process using the same apparatus. The invention improves oxygen transfer rate and utilization of oxygen, thus enabling cultivation at a higher concentration of microorganisms as compared with any conventional process.