Abstract: The present disclosure relates to the technical field of wastewater treatment, and provides a wastewater treatment method and apparatus based on hydrate-based water vapor adsorption. The apparatus includes a wastewater evaporation zone, a hydrate formation zone, a hydrate decomposition zone, and a data acquisition and control system. Rising water vapor and condensed water formed during evaporation of wastewater at normal temperature react with a hydrate former on a cooling wall surface to form a hydrate, continuous evaporation of the wastewater is promoted, the hydrate is scraped off to a collecting zone below by a scraper after being formed, and the hydrate is decomposed into fresh water, thereby realizing wastewater treatment. The present disclosure provides a method for treating complex wastewater containing a plurality of pollutants, where water vapor is consumed to form the hydrate to promote wastewater evaporation, and water obtained from the decomposition does not contain pollutants theoretically.

Abstract: A method including directing an aqueous solution having dissolved carbon dioxide and dissolved ozone into a vessel, removing an amount of the dissolved carbon dioxide and irradiating the effluent with ultraviolet light to decompose an amount of the dissolved ozone is disclosed. The method may include removing the dissolved carbon dioxide by controlling pH. The method may include removing the dissolved carbon dioxide by contact with a membrane degasifier. A system including a channel fluidly connectable to a source of an aqueous solution having dissolved carbon dioxide and dissolved ozone, a dissolved carbon dioxide removal subsystem, and a source of ultraviolet irradiation is also disclosed. The dissolved carbon dioxide removal subsystem may include a source of a pH adjuster. The dissolved carbon dioxide removal subsystem may include a membrane degasifier.

Abstract: A process and apparatus for managing hydrogen sulfide in a refinery is provided. In the process, a hydrogen sulfide stream from said refinery is fed to a sulfur recovery unit to produce sulfur and a sulfur compound stream or to a thermal oxidizer. The sulfur compound stream and the hydrogen sulfide stream are then thermally oxidized to produce a sulfur oxide stream. The sulfur oxide stream is then reacted with an ammonia stream. In aspect, the product of the reaction can be a fertilizer. The ammonia stream can be obtained from stripping the hydrogen sulfide stream.

Abstract: A method of supplying water using a natural water pipeline includes withdrawing impaired water from an impaired water body connected to a waterway and treating the impaired water from the impaired water body to produce treated water. The method also includes discharging the treated water into the waterway and conveying the treated water via the waterway to one or more locations proximate to one or more remote operational facilities that withdraws water from the waterway at the one or more locations. The method further includes receiving a monetary value from one or more operational entities operating the one or more remote operational facilities and providing at least a portion of one or more water access rights to the one or more operational entities in exchange for the monetary value.

Abstract: An apparatus for producing butadiene by way of oxidative dehydrogenation of a butene-rich feed stream includes: (a) a reactor adapted for receiving said butene-rich feed stream and converting butenes to butadiene, thereby providing a butadiene enriched product effluent stream; (b) a superheater coupled to the reactor to receive the butadiene enriched product effluent stream from the reactor as well as being configured to receive reactor feed, said superheater transferring sensible heat from the butadiene enriched product effluent stream to reactor feed and (c) a first feed-vaporizer coupled to the superheater to receive the butadiene enriched product effluent stream as it exits the superheater and to transfer sensible heat from the butadiene enriched product effluent stream to reactor feed. Also provided are (d) a second feed vaporizer; (e) a purification train; and (f) a thermal oxidizer.

Abstract: Method for cleaning hydraulic liquid in a industrial truck, wherein said industrial truck is an electrically powered industrial truck having a battery as an energy source with a hydraulic system comprising, a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of, the hydraulic pump is activated for hydraulic activity, the hydraulic pump pumps the liquid for the hydraulic activity and in relation to this return flow through the return filter to the hydraulic reservoir occurs, the hydraulic pump can be activated by means comprised in the industrial truck, when hydraulic activity is not present, by that achieving a circulation to the hydraulic reservoir through the return filter such that sufficient filtration of the hydraulic liquid is reached, further a time Tb for circulation without hydraulic activity can be accumulated and/or a sensor for determining the quality of the hydraulic oil can be arranged in the industria

Abstract: Water purification and recycling system that generates electricity and has a large reservoir and a small reservoir that provides potable water to a water user structure. After use by the water user structure, wastewater is applied from said water user structure via at least one wastewater path to wastewater treatment apparatus. The wastewater treatment apparatus receives and processes the wastewater using a power plant that operates continuously to produce steam. The wastewater treatment apparatus is also powered by a co-adjuvant gas turbine generator is adapted to generate supplemental steam for the power plant.

Abstract: The invention discloses an apparatus and method to uniformly disperse ozone gas bubbles into liquid phase water for the treatment thereof. The apparatus consists of a water inlet section connected with a section with structured packing or monolith having parallel flow channels. A portion of the influent water is withdrawn from the main water stream as a side stream, pressurized by a pump, mixed with ozone-containing gas, and then injected back into the main water flow. The side stream may be divided into multiple streams either before or after mixing with the ozone-containing gas, and then injected into the main flow section upstream of the packed section. In alternate embodiments, the ozone-containing gas can be injected directly through the gas diffusers just upstream of the packed section in order to achieve uniform concentration of gas and liquid in the fluid entering the monolith.

Abstract: An oil management system to reduce and remove the amount of soot, rust or other contaminating particles in oil used in an engine, the oil management system comprising an oil filter assembly including a filter element and an additive cartridge, the additive cartridge configured to provide a means for continuously dispersing a small quantity of additive into the oil; an oxidation prevention means to prevent or diminish oxidation of metal in the oil management system; and an oil condition monitoring sensor to measure various aspects of the oil in the oil management system.

Abstract: A batch process for the treatment of an aqueous solution so that the treated product is more desirable for disposal includes obtaining an influent batch of aqueous solution for treatment, treating the batch of solution by an advanced oxidation process. The advanced oxidation process including causing ozone to be mixed with the solution, maintaining the mixture of solution and ozone at a pressure above atmospheric for a time of at least two seconds. In a preferred embodiment of the process, the process includes continuously recirculating the fluid to be treated, through a recirculation conduit, the recirculation conduit including an ozone injector and the ozone injector is adapted to inject ozone into the aqueous solution as the aqueous solution circulates through an ozone injector. Influent to be treated may be selected from the group including sewage, septage, leachate, ballast or other aqueous solutions where it is desirable to treat the fluid prior to disposal, further treatment, or reuse.

Abstract: The invention relates to methods and apparatuses for treating a condensate stream from a condenser that contains odorous compounds, such as various condensate streams produced in a rendering process. In one embodiment, the condensate stream is treated by adding an oxidizer to the liquid condensate stream to oxidize odor-causing compounds in the stream prior to being treated in a waste water pre-treatment system. In this manner, the odor resulting from these compounds can be reduced or eliminated.

Abstract: A system and method for stabilizing bromine in an industrial water system by monitoring and flexible dosing of chlorine oxidant and halide ion stabilizer residual levels. The system comprises chlorine oxidant, and a halide ion source with a halogen stabilizer.

Abstract: The invention is a Swimming Pool Chemical Mixer in which swimming pool water circulates from a swimming pool into an induction tank which contains calcium hypochlorite tablets. The tablets dissolve while sitting on a tray positioned just under the water level in the tank. The tank's tray has holes it that are sized to allow the calcium hypochlorite tablets to proceed past the tray and back into the swimming pool when they have sufficiently dissolved, leaving the tank through a gravity-fed outlet pipe affixed to the tank at one end, with the other end of the outlet pipe affixed to the recirculation pipes leading back to the swimming pool.

Abstract: A method of treating water with chlorine dioxide (ClO2), by: surrounding a reaction chamber, in which the ClO2 is generated, with water, wherein the water surrounding the reaction chamber is simultaneously the water to be treated; and passing a reaction solution comprising the ClO2 formed in the reaction chamber out of the reaction chamber through an outlet directly into the water, thus treating the water.

Abstract: Apparatus and methods for removing solutes from wastewater are disclosed. An embodiment provides a reactor tank having a manifold located at or near an interface between a lower (upstream) section having a first cross-section and a higher (downstream) section having a second cross-section smaller than the first cross section. An inlet for wastewater to enter the reactor tank is located in or below the first cross-section. A recycling path is provided for removing wastewater from the manifold and recycling at least part of the removed wastewater into the reactor tank. An outlet for water to exit the reactor tank is located downstream from the manifold.

Abstract: A method for treating effluent containing dissolved or suspended solids includes directing the effluent containing dissolved or suspended solids to a reactor and oxidizing at least a portion of the dissolved or suspended solids in the reactor with an oxidizing agent. Oxidation is carried out at a temperature ranging between approximately 20° C. and approximately 350° C. and at a pressure ranging between approximately 1 bar and approximately 160 bar. A gaseous phase and a liquid phase form within the reactor during oxidation. The method includes separating the gaseous phase from the liquid phase and heating the effluent in the reactor with the heat produced from the oxidation of the dissolved or suspended solids.

Abstract: A system for the production or handling of heavy oil comprises means (18) for introducing an immiscible viscosity-reducing fluid into the heavy oil at an upstream end of a flow line (10,22) to create a dispersion of oil and viscosity-reducing fluid, and means (24,30) for separating the viscosity-reducing fluid at least partially from the oil at a downstream end of the flow line. The separating means comprises a cyclonic fluid conditioning unit (24) connected receive the dispersion of oil and viscosity-reducing fluid from the downstream end of the flow line (22), said cyclonic fluid conditioning unit being constructed and arranged to subject the dispersion to a cyclonic conditioning process; and a gravity separator unit (30) connected to receive the conditioned dispersion from the cyclonic fluid conditioning unit.

Abstract: Disclosed is a method for processing wastewater after de-sizing. The method includes the step of executing a preliminary treatment on the wastewater to intercept slurry and to stabilize the quality of the wastewater, the step of reducing the pH of the wastewater to a range between 6.0 and 7.5, the step of providing a refractory degradation material 30 for hydrolyzing and hence liquidating starch slurry in the wastewater, the step of separating solids from liquid of the wastewater; and the step of recycling the liquid.

Abstract: A method for collapsing a microbubble includes applying stimulation to the microbubble during the gradual decrease of the its size. As a result, the microbubble floating in a solution that decreases in size due to the natural dissolution of a gas contained in the microbubble and disappears after a while, has the speed of its size decrease enhanced and causes the microbubble to disappear.

Abstract: A method for cleaning process apparatus used for production of liquids, especially for cleaning filters, for example membrane filters. The apparatus is contacted with a solution of peroxydisulphate. It is especially preferred that the cleaning process is carried out at a temperature between 15 and 95° C.

Abstract: A wastewater treatment apparatus and method with stair-like heat treatment tanks for performing a breakdown process are disclosed, in which the apparatus comprises: a mixing tank, for evenly mixing wastewater with reaction agents and thus forming a mixed solution; a plurality of heat treatment tanks, for enabling the mixed solution to circulate therein while being heating for a period of time so as to perform an organic destruction process upon the mixed solution and thus cause a discharging liquid to be formed; a heat exchanger, for enabling a heat exchanging process between the discharging liquid and the mixed solution to be performed therein; a condensation tank, for receiving and cooling the discharging liquid; a water purifier, for purifying and thus separating the discharging water into a cleaned water and a concentrated liquid for outputting; an agent recycling unit, for electrolyzing the concentrated liquid so as to recycle the reaction agents.

Abstract: A method of mixing liquid waste material in a digester tank by extending a supporting beam between opposing walls of the tank, securing a paddle to the supporting beam, fixturing the paddle for rotation about the supporting beam, securing a pair of inflatable air sacks to the paddle at opposing ends, and selectively inflating and deflating the sacks to force the paddle to tilt in cyclic motion thereby mixing the liquid waste containing bacteria, waste material, and oxygen uniformly throughout the digester tank.

Abstract: An apparatus and method for controlling a water characteristic of a body of water by controlling the cyclic release of a water characteristic material into the body of water with or without the system being responsive to a level of the water characteristic in the body of water with the system capable of being controlled from a display or from a wireless control module or both.

Abstract: A system for reducing or preventing the growth of organisms in the process water used to coat glass fibers with a formaldehyde-free binder composition. One or more biocides is added to the process water that mitigates the growth of microbes in the water. The biocides are added in an amount sufficient to minimize growth of organisms without adversely affecting the application of the binder composition to the glass fibers.

Abstract: A water chlorinating device having a vessel (2) in turn having a bottom portion (6) for containing water; a grille (10) located over the bottom portion and for supporting a solid chemical chlorinating substance (11); a spray device (13) for directing at least one water jet on to the grille (10); and a mixing nozzle (29) located inside the bottom portion (6), at the bottom of the vessel (2), and for agitating the water in the bottom portion (6) by means of a water jet.

Abstract: The present invention describes methods and kits for determining the concentration of free chlorine in water. To avoid false readings from other species present in the water, the free chlorine is reacted with ammonia to form monochloramine, which is then reacted to form an indophenol or an indonaphthol. The concentration of the indophenol or indonaphthol is proportional to the total monochloramine present. Subtracting the concentration of residual monochloramine from the total monochloramine yields the concentration of monochloramine formed from the free chlorine and ammonia, and is proportional to the concentration of free chlorine. Embodiments of the present invention will simplify and accelerate accurate measurements of free chlorine in water, without interference from compounds impacting present measurements of free chlorine.

Abstract: A processor for decontaminating devices is comprised of a chamber for holding devices and a circulation system to circulate a microbial decontamination fluid through the chamber. A water filtration system filters water used in the processor. The water filtration system has a water line connectable to a source of pressurized water. A water decontamination system fluidly communicates with the source of water and the processor. The water decontamination system has a water circulation path and a tank located within the water circulation path. Means are provided to circulate water along the water circulation path through the tank. A gas circulation path fluidly communicates with the tank. Conveying means is provided to convey gas along the gas circulation path through the tank. An ozone producing device is located along the gas circulation path to introduce ozone into gas flowing along the gas circulation path and through the tank.

Abstract: Disclosed is a method of inhibiting and/or removing deposits from internal surfaces in a hot water system. The method includes controlling a real-time oxidation-reduction potential in a hot water system to alter the dynamic between deposit constituents and the bulk water of the system to inhibit deposition or initiate deposit removal. The method is equally effective for a system undergoing a wet layup sequence or in an online operational system. The invention further includes a multi-component deposit inhibition and/or removal device, including a receiver, a processor, and a transmitter that work in unison to alter the system dynamics to inhibit or remove deposits.

Abstract: An apparatus for disinfecting surfaces and in particular human and animal wounds, includes a contractor for accumulating concentrated ozonated water and systems to deliver ozonated water from the reservoir to a nozzle having one or more jets for delivering a spray of ozonated water on to the surface to be treated. The nozzle has an encircling shroud and systems are provided for withdrawing ozonated gas liberated at the nozzle from around the nozzle. A collection tray is provided which is located under the surface/wound to be treated to receive ozonated water flowing from the treatment region and where any residual ozone is broken down.

Abstract: Disclosed is a method of controlling a real-time oxidation-reduction potential in a hot water system undergoing a wet layup sequence to inhibit corrosion in the hot water system. The method includes separating the wet layup sequence into a plurality of phases. Each phase is either short-term or long-term and a subset of the short-term phases is optionally transitional. The method further includes defining one or more zones in the hot water system. At least one of the defined zones is selected for each phase and one or more of the selected zones include at least one ORP probe operable to measure the real-time ORP and communicate with a controller. The ORP probe(s) either intermittently or continuously measure the real-time ORP at operating temperature and pressure at one or more of the selected zones in one or more of the phases and transmit the measured real-time ORP to the controller. The real-time ORP is assessed to determine whether it conforms to an ORP setting for that phase.

Abstract: A wastewater treatment system including carbon dioxide gas injection means for injecting a carbon dioxide gas into wastewater which takes place during silicon processing to obtain raw wastewater to be treated; a wastewater tank; a filter membrane through which the raw wastewater is filtered; a liquid forwarding pump which forwards the raw wastewater to the filter membrane; and circulation/forwarding control means which can forward concentrated water and/or filtered water to the wastewater tank and which can regulate the pH of the raw wastewater to 4.0 to 6.5 to forward this wastewater to the filter membrane, when the amount of the raw wastewater present in the wastewater tank is below a reference amount.

Abstract: A modular waste disinfection system for the disinfection of substantially liquid infectious waste streams and methods of treating such waste streams are disclosed. The modular waste disinfection system includes a metal ion generation chamber for introducing metal ions into the waste material; an oxidant generation chamber in fluid flow communication with the metal ion generation chamber for disinfection of the waste material with an oxidizing agent; and a chelation chamber in fluid flow communication with the oxidant generation chamber for deactivation of metal ions in the waste material, wherein the waste is discharged to a sanitary sewer after disinfection.

Abstract: A modular waste treatment system for substantially liquid waste streams and methods of treating liquid waste streams are disclosed. The modular waste treatment system includes a maceration chamber for initial treatment and homogenization of waste material; a metal ion infusion chamber in fluid flow communication with the maceration chamber for introducing metal ions into the waste material; and an oxidation chamber for wet oxidation of the waste stream.

Abstract: A system for reducing or preventing the growth of organisms in the process water used to coat glass fibers with a formaldehyde-free binder composition. One or more biocides is added to the process water that mitigates the growth of microbes in the water. The biocides are added in an amount sufficient to minimize growth of organisms without adversely affecting the application of the binder composition to the glass fibers.

Abstract: A process for treating a sludge of biological solids has the steps of mixing an oxide-containing chemical with a pozzolanic material, reacting the mixture with the sludge so as to elevate a temperature of the sludge to between 40° C. and 140° C., pressurizing the blended sludge to a pressure of greater than 14.7 p.s.i.a., recycling a portion of the reacted sludge so as to increase a solids content of the sludge, and discharging at least a portion of the pressurized mixed sludge. The step of discharging includes flashing the pressurized mixed sludge across a restricting orifice so as to cause the liquid component to be evaporated.

Abstract: The invention relates to a method of controlling the level of corrosivity of an aqueous solution recovered during a process for producing a blanket of mineral fibers, comprising in particular the fiberizing and the coating of said fibers with a binder comprising a polyacid typically of the acrylic type, said aqueous solution being at least partly recycled into a zone in which said resin is prepared and/or a scrubbing zone of the production plant, said method being characterized in that the pH of the solution in the recycling circuit is maintained between minimum and maximum values by injecting into said circuit an agent for modifying said pH, such as a base, the quantity injected or the flow rate of the pH-modifying agent being adjusted directly according to the quantity or the flow rate of acid binder injected during the fiberizing process. The invention also relates to the device for implementing the method.

Abstract: A method and apparatus for implementing pathogen reduction within a poultry processing or food processing plant that uses water that has been treated with chloramines at an advantageous dosage before being introduced to the production process at processing steps. The water treated with chloramines may be from a fresh water source or reclaimed water from the processing plant. The reintroduction of the treated reclaimed water advantageously causes a dramatic reduction in the levels of microorganisms associated with poultry processing, while substantially conserving water use.

Abstract: A system, a device and a method for maintaining water quality in a pool or similar water container for use by people which is characterized in that a pressure sensor is arranged to sense the pressure variations inside a main water container 1 and to provide a pressure variation signal to a control and processing unit 3. The control and processing unit is connected with a dispensing module and is adapted to generate and transfer control signals to said dispensing modules. The control signal depends on the detected pressure variation signal. The system for water treatment comprises also a water treatment circulation loop 3A-D at least one controllable chemical dispensing module 8A-D, 9A-D. The circulation loop is adapted to pump water from the main water container 1, around the circulation loop 3A-D, and back into the main water container 1 via the dispensing module for dispensing a chemical treatment agent.

Abstract: A method for treating a process water from a bitumen recovery process in order to obtain carbon dioxide from the process water, which method includes lowering the pH of the process water, thereby causing carbon dioxide to evolve from the process water as evolved carbon dioxide gas. The evolved carbon dioxide gas may be collected and compressed, and water vapour associated with the evolved carbon dioxide gas may be separated from the evolved carbon dioxide gas. After the carbon dioxide has been obtained from the process water, the process water and the water vapour separated from the evolved carbon dioxide gas may be recycled back to the bitumen recovery process. The evolved carbon dioxide gas may be stored for future use or sale. The method may also include heating the process water in order to reduce the solubility of carbon dioxide in the process water.

Abstract: Systems and method for generating electricity using heat from a SCWO reaction. The system may comprise a pump that pumps the mixture undergoing the SCWO reaction to a pressure above the critical pressure point for the mixture. The pressurized mixture is heated, by a heating system, above the critical temperature point for the mixture. The SCWO reaction occurs in a reaction chamber. The reaction chamber is in thermal communication with a vessel that holds water such that the heat from the mixture heats the water into steam. The steam powers a steam turbine, which is connected to an electrical generator to thereby generate electricity.

Abstract: A method and an apparatus for removing dissolved organic substances from an oily water obtained as a by-product from an oilfield, characterized in that an oily water obtained as a by-product from an oilfield by separating a crude oil from a crude oil/brine mixture is brought into contact with an adsorbent to adsorptively remove organic substances dissolved in the water containing oil suspended therein and that the adsorbent is regenerated.

Abstract: Systems and methods to degas fluids are described herein. A fluid degassing treatment system may include a reservoir and/or one or more fluid treatment systems.

Abstract: A control system comprising a timer based controller and a valve wherein the timer-based controller has a fixed period and the timer based controller regularly cycles the valve between a first condition and a second condition with the first portion of the cycle directing a first flow of water through a dispensable material and the remaining portion of the cycle directing a lesser flow of water through the dispensable material.

Abstract: In wastewater treatment equipment, a surfactant is added to a micronanobubble reaction vessel 3 by using a surfactant pump 8 and a surfactant tank 9 which constitute a surfactant adding section. Thereby, a micronanobubble generator 4 stably and efficiently produces micronanobubbles in the treatment water as raw water containing the surfactant in the micronanobubble reaction vessel 3. Thus, the micronanobubbles make it possible to efficiently pretreat the wastewater introduced into the micronanobubble reaction vessel. Consequently, it becomes possible not only to enhance efficiency of wastewater treatment but also to reduce a treatment load on wastewater treatment equipment 14 in a step subsequent to the pretreatment. Thereby, scale of the wastewater treatment equipment 14 is reduced.

Abstract: A method for treating a spent caustic solution having a pH greater than about 10.5 includes the steps of (a) lowering the pH of the caustic solution into the range of between about 10 to 10.5 to produce a pH-modified caustic solution; (b) oxidizing the pH-modified caustic solution until the solution to produce a non-sulfide reactive oxidized solution; and (c) lowering the pH of the oxidized solution to a pH less than 9. Methods for oxidizing inorganic substrates in aqueous solutions using an oxidizing agent such as pure oxygen, oxygen-enriched air or ozone are improved by including in the headspace above the aqueous solution a diluent gas and by recycling the oxygen with diluent gas into the reactor.

Abstract: A gas injector that is coupled to the pump strainer basket housing drain port of a pump-circulated system is disclosed. The gas injector that may be installed in a way that is less invasive than currently used gas injection systems to pre-existing plumbing of a pump system and that allows for more efficient gas absorption in water than currently used gas injection systems. The gas injector may be used with all currently existing pump systems.

Abstract: Provided herein are methods and system for the production of biogas, U.S. Environmental Protection Agency classified Class A Biosolids, and pathogen reduced organic liquid fertilizer. Through the digestion of waste materials using sequential phases in an efficient digestion process, enhanced biomass conversion efficiency and improved output of products (in quantity and/or quality) are obtained with a significant reduction in dwell time in each phase.

Abstract: A circulation system for bodies of water. In one set of embodiments for larger bodies of water, modified horizontal plate designs are provided at the entrance of the draft hose. The plate designs have sections that pivot downwardly as the flotation platform and depending draft hose are rapidly raised in high wave conditions to let the water escape downwardly out of the hose. Adaptations to the floats for the elongated arms of the platform are also made to essentially eliminate the creation of any damaging torques on them from high waves. Another set of embodiments are particularly adapted for smaller systems in municipal water tanks for thorough mixing of the water and treatment to kill undesirable ammonia oxidizing bacteria and prevent or at least inhibit their return.

Abstract: A system and method is described for destroying microbes in water from bathing apparatuses, such as swimming pools, using heat. Part of the stream from the pool is diverted, heated to an antimicrobial temperature, and recombined as a merged stream before it reenters the pool at a safe temperature. Further embodiments include addition of chemical antimicrobial agents, a controller, a storage vessel, and a cooler. Operating costs will increase little, if any, as compared with a conventional system.

Abstract: A recirculated marine aquaculture system for growing crustaceans within a body of water includes a wholly submerged chamber situated in the body of water having a filtering wall connecting the chamber floor and ceiling permitting water to flow from the water body into the first chamber while excluding particulate materials. A second chamber is situated above the first chamber having a plurality of water outlets below the body of water upper surface, and a top having an air inlet above the body of water upper surface. A stand pipe has an open lower end opening into the first chamber and a plurality of laterally directed openings into the top of the second chamber. An impeller coupled to the stand pipe moves filtered water from the first chamber through the laterally directed openings into the second chamber adjacent to the air inlet, the water exiting the second chamber into the body of water through the plurality of water outlets after mixing with air drawn in through the air inlet.