Abstract: Disclosed is an autothermal aerobic digestion system having closed defoaming system. The system according to the present invention completely controls light and heavy foam by using a series of aeration venturi and defoamer venturi and a foam collector pipe. According to this invention, an internal pressure of a digester is elevated by using inversely troublesome foam, so pathogenic microorganisms is destroyed. In addition to, by using simple venturi, an air inlet, defoaming and a recycling of a warm air can be achieved.

Abstract: A treatment system for a process fluid, comprising a plurality of chambers interconnected with one another in sequence such that a process fluid can pass through them, means for determining the process conditions in at least some of the chambers by varying at least one process parameter while the process fluid is resident in the chamber such that different parts of a complex process are encouraged to take place in different chambers of the system.

Abstract: An apparatus and system are disclosed for retrofitting a septic tank from a failed residential wastewater treatment system to permit discharge to a surface water body rather than an underground drainage field. The apparatus is a chlorinating tank, comprised of a tank having an inlet and outlet pipe. An inlet diffuser and an outlet diffuser are posited within the chlorinating tank, the inlet diffuser is in hydraulic communication with the inlet pipe, and the outlet diffuser is in hydraulic communication with the outlet pipe. A filter is posited in the outlet diffuser for filtering any remaining solids in the treated wastewater. A chlorinating device is posited downstream of the filter within the chlorinating tank, for adding dissolved chlorine to the chlorinating tank volume.

Abstract: An apparatus for treating organic sludge by aerobic digestion has an aerobic digestion tank 1, a circulation line 6 provided with a pump for pumping circulated sludge, a liquid/gas ejector 7 for aspirating an oxygen-containing gas, which has been humidified, and for mixing it with the circulated sludge, a liquid/liquid ejector 8 for mixing the circulated sludge with sludge in a later step, a downward directing pipe 9 for passing downwards therethrough a gas/liquid mixture and an ozone-treated unit 31.

Abstract: The performance of a leach field of a septic tank type wastewater treatment system and other analogous devices is enhanced, maintained or rejuvenated by flowing air or other active gas through conduits of the system. Air is flowed serially through leaching chambers, perforated pipes in stone filled trenches, pits and the like, and the adjacent soil where wastewater treatment takes place. In alternate embodiments, conduits are pressurized or evacuated; and, auxiliary pipes are buried in vicinity of the conduits. An air mover creates a differential pressure sufficient to effect a desired physical or biochemical change in the soil adjacent the conduits, variously to to an extent sufficient to push water from saturated soil and to change the gas composition in the soil. Different valve devices and piping configurations are used to manage the desired flow of air and wastewater.

Abstract: A method of disposing waste includes the step of forming a primary waste pond called an Advanced Facultative Pond (AFP). A stable microbiological methane fermentation zone is established within the AFP. The system constitutes a complete primary treatment of organic waste and wastewater that does not require daily sludge handling typically associated with organic waste treatment and disposal. The method of the invention converts organic compounds, including settleable solids, into methane. The invention controls sulfide odors from methane fermentation. The invention also provides a method of filtering raw wastewater through a bed of fermenting organic solids suspended by gas evolved in a fermentation zone. Hydrogen sulfide is oxidized in accordance with the invention. The technique of the invention biologically increases pH near the pond surface, thus retaining hydrogen sulfide in solution in the pond water.

Abstract: There is described a process for the treatment of water to prevent the survival of unwanted organisms in said water. The process is based on the supply of gas into the water at pressures greater than 1 atmosphere, while ensuring that the mass trasnport of gas into the water is greater that the mass loss across the air-water (surface) interface, i.e. such that a gas super-saturated condition is established. Further, there is described an apparatus or system for the treatment of a body of water, i.e. to prevent the survival of organism in said water. A preferable embodiment comprises a compressor which delivers a compressed gas to said water system in an amount sufficient to establish a supersaturated condition in said body of water.

Abstract: An apparatus to transfer gas to or from a liquid has a flexible and oxygen permeable but liquid water impermeable membrane, a flexible and gas permeable spacer, an inlet conduit, an outlet conduit and a non-rigid restrain system. When used for treating wastewater, an aerobic biofilm is culture adjacent the planar elements, an anoxic biofilm is cultivated adjacent the aerobic biofilm and the wastewater is maintained in an anaerobic state. A first reactor for treating wastewater has an anaerobic section, a plurality of gas transfer membrane modules, and an aerobic section. A biofilm is cultivated on the surface of the gas transfer membranes in fluid communication with the anaerobic section. Biological reduction of COD, BOD, nitrogen and phosphorous are achieved. In a second reactor, phosphorous is also removed chemically in a precipitation branch.

Abstract: This metal containing waste water treatment method introduces a metal containing waste water from above into a submerged membrane separation tank 1 in which a reaction section 2, a submerged membrane section 3 having a submerged membrane 5 and a precipitation section 4 are arranged in order from top to bottom, causes a reaction by adding a pH adjuster to the reaction section 2, subsequently separates water from metal by the submerged membrane 5 of the submerged membrane section 3 and subsequently precipitates and concentrates the metal in the precipitation section 4. As described above, according to this treatment method, the pH adjuster is added to the reaction section 2, and therefore, solid-liquid separation can be effected by the submerged membrane 5 with a hydroxide formed. Moreover, the metal can be precipitated and concentrated by the action of gravity without using energy in the precipitation section 4.

Abstract: Modules of ultrafiltration or microfiltration membranes are arranged in a tank open to the atmosphere to substantially cover the cross sectional area of the tank. A filtration cycle has permeation steps and deconcentration steps. During permeation, supply of feed substantially equals feed removed and little if any aeration is used During deconcentration, aeration with scouring bubbles is provided with one or both of backwashing and feed flushing. In feed flushing, feed water is supplied to the tank from below the modules. Excess tank water created during deconcentration flows generally upwards through the modules and out through a retentate outlet or overflow at the top of the tank.

Abstract: Wastewater treatment systems and processes for: removal of solids, pathogens, nitrogen, and phosphorus from municipal and agricultural wastewater include nitrification of wastewater and increasing the pH of the nitrified wastewater by adding a metallic-containing salt and hydroxide to precipitate phosphorus to form a useable effluent having a specified nitrogen:phosphorus ratio that is useful as a fertilizer or spray for remediation of contaminated soils. The presence of infectious microorganism such as enteropathogenic bacteria and picarnoviruses will be reduced in the useable effluent. The precipitated phosphorus is recovered and used to form useable phosphorus products.

Abstract: A collapsible water treatment digester includes a flexible bladder, a frame, and a plurality of filter plates. The flexible bladder is movable from a collapsed position wherein the bladder is folded into a substantially flattened state to an expanded position wherein the bladder forms a water treatment chamber. The frame is connected to the bladder so as to support the bladder in the expanded position. The filter plates are disposed within the water treatment chamber of the bladder so as to cause a substantial portion of the solids from a wastewater stream introduced into the water treatment chamber to produce a reconditioned water stream dischargeable from the bladder.

Abstract: A system and process for the treatment of wastewater in a series of sequencing batch reactor basins wherein wastewater is sequentially fed, treated and discharged on a continuous basis.

Abstract: In the present invention, solid contents 38, which are collected by a solid-liquid separation device 33 in a solid-liquid separation tank 14 and charged into a decomposing treatment tank 11, are decomposed to water and CO2 by the action of aerobic microbes and the air (oxygen) supplied from a lower aeration tank 12 and substantially disappear. The oil contents contained in the water having been decomposed is removed by an oil-water separation tank 13.

Abstract: A filter device has a filter housing, which is intended to contain a liquid to be filtered and in which at least one filter rod is arranged. The filter rod is composed of annular washers, which are arranged in a stack on a core formed with openings and which are so closely packed that particles in the liquid adhere to the periphery of the washers when the liquid is caused, from the outside, to pass between the washers into the core for filtration. The filter device has a gas supply member, which is intended to inject a gas flow into the liquid in the filter housing. In a method of cleaning a filter rod for filtering a particle-containing liquid in such a filter device, a gas flow is injected into the liquid in the filter housing so that a particle sock, which is formed on said filter rod of particles in the liquid, is detached from the filter rod and disintegrated.

Abstract: In a wastewater treatment process involving in-line removal of settled solids through a submerged solids collection manifold, the invention provides devices (and methods?) for resuspending concentrated solids using hydraulic pressure waves to improve removal through the collection manifold. The pressure waves are preferably created by cycling on/off signals to the solids collection pump at a user selected frequency. In some applications resuspension is provided by air scouring. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for mechanical agitators or scrapers.

Abstract: Methods and apparatus for demulsifying oil in water by dilution and impact, and for separation of the oil and suspended solids by dissolved gas floatation, are described. A produced water treating system is also described. The produced water treating system may include a dissolved gas floatation clarifier system, an oil demulsification system, and a separation system. A demulsification subsystem is also described. The apparatus may include a liquid-liquid fluid mixer and a gas generator.

Abstract: The invention relates to an aerobic wastewater digestion unit useful for degrading organic material dissolved or suspended in a wastewater stream. The wastewater is fed to a vessel, wherein it is circulated by a liquid conveyor between the vessel and a downwardly-directed tube. Expulsion of fluid from the tube into the lower portion of the vessel agitates the liquid in the vessel and disperses into the liquid air that has been entrained in the liquid in the tube. The digester can be operated using varying liquid levels, and is amenable to batch, semi-batch, and continuous operation. The digester is suitable for use in combination with other components of wastewater treatment systems, and can be included as a module in modular wastewater treatment systems.

Abstract: A wastewater aeration system that can be pivoted upwardly to expose the treatment basin floor for removal of accumulated grit or other solids. The aeration system includes a blower and a rigid or flexible supply conduit extending into the basin to supply lateral pipes with air. The laterals normally extend horizontally along the basin floor and carry air diffusers which discharge air into the basin. A winch and cable system or other mechanism can be operated to pivot the lateral pipes and diffusers upwardly away from the basin floor so that they are out of the way of equipment used to remove grit from the floor. A vertical track may be provided along a wall of the basin to accommodate raising of the lateral pipes and diffusers out of the basin.

Abstract: An apparatus using activated sludge for the removal of biological nutrients from a wastewater includes a bioreactor for containing a mixture of wastewater under treatment and activated sludge. The bioreactor is divided into a plurality of serially connected treatment zones and includes a wastewater inlet, a downstream aerobic zone and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone. A method for removal of nutrients from a wastewater includes providing a wastewater to an inlet of a serial, multi-zone, activated sludge bioreactor containing an activated sludge. The bioreactor has a downstream aerobic zone from which water is removed and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone.

Abstract: A multistage immersion type membrane separator in which an air diffuser is disposed under a filtration part immersed in a treatment tank, characterized in that: the filtration part has plural plate-like membrane cartridges arranged in a vertically parallel multistage fashion at spaced intervals for forming a crossflow passage of a predetermined width; and that the air diffuser has a diffuser tube disposed sidewardly that is communicated at its basal end to an air supply source and has at its lower side part plural blowholes, a flushing pipe that is communicated at its basal end to the tip of the diffuser tube and has at its tip an opening serving as an outlet above the diffuser tube, and a flushing valve disposed in the flushing pipe.

Abstract: A method and apparatus for cleaning a membrane module, the membrane module having a plurality of porous membranes, the membranes being arranged in close proximity to one another and mounted to prevent excessive movement therebetween and means for providing, from within the module, by means other than gas passing through the pores of the membranes, gas bubbles entrained in a liquid flow such that, in use, the liquid and bubbles entrained therein move past the surfaces of the membranes to dislodge fouling materials therefrom, the gas bubbles being entrained in the liquid by flowing the liquid past a source of gas to draw the gas into the liquid flow. The gas bubbles are preferably entrained into the liquid using a venturi type device. The membranes are preferably partitioned into discrete groups to assist cleaning while maintaining high packing density.

Abstract: A filtration apparatus is provided which is easy to maintain, manage and which enables preservation of filtration characteristics due to the fact that filtration is carried out by use of a gelatinous filter apparatus. In the filtration apparatus, filtration characteristics can be maintained by providing a bubble supplying mechanism for removing a sedimentary layer comprising removables that is formed on a surface of a filtration film and a filtration characteristics restoring mechanism for restoring the filter film clogged by the removables by causing a back-flow of filtered water accumulated in a cistern. Filtration apparatus maintenance and management are facilitated by improving recovery efficiency of the precipitated removables by tapering a lower part inside a raw water tank and providing a recovery tank for recovering removables via a valve.

Abstract: A collapsible water treatment digester includes a flexible bladder, a frame, and a plurality of filter plates. The flexible bladder is movable from a collapsed position wherein the bladder is folded into a substantially flattened state to an expanded position wherein the bladder forms a water treatment chamber. The frame is connected to the bladder so as to support the bladder in the expanded position. The filter plates are disposed within the water treatment chamber of the bladder so as to cause a substantial portion of the solids from a wastewater stream introduced into the water treatment chamber to produce a reconditioned water stream dischargeable from the bladder.

Abstract: A filtration device is provided in which wastewater, in the form of a colloidal solution containing microparticles, is guided to tank, circulated, and filtrated using a second filter. The device includes a gel film that is formed by suction on the surface of a first filter. The suction pressure in this process is made extremely weak to maintain the filtration capacity while extending intervals prior to clogging of second filter 2. Furthermore, a filtration device is realized with which the gel film of second filter that becomes adsorbed onto the surface of first filter can be separated readily by stopping the suction and filtration can be continued again thereafter.

Abstract: A sparging system for in-situ groundwater remediation for removal of contamination including dissolved chlorinated hydrocarbons and dissolved hydrocarbon petroleum products including the use in injection wells of microfine bubble generators, matched to substrates of selected aquifer regions, for injection and distribution of said bubbles containing oxidizing gas through said aquifer and to selectively encapsulating gases including oxygen and ozone in duo-gas bubbles which, in the presence of co-reactant substrate material acting as a catalyst, are effective to encourage biodegradation of leachate plumes which contain biodegradable organics, or Criegee decomposition of leachate plumes containing dissolved chlorinated hydrocarbons.

Abstract: An aerator/mixer which includes a rotatable hollow drive shaft one or more air intake ports adjacent one end, and a propeller and an air permeable diffuser mounted adjacent to the other end; the diffuser is mounted below the propeller; and is in communication with the interior of the hollow drive shaft such that air supplied to the air intake port can exit only through the diffuser, the aerator/mixer further includes a device for rotating the drive shaft and the propeller and a device for supplying air at above atmospheric pressure to the or each air intake port.

Abstract: A process where gas bubbles are produced under a partial vacuum and are dynamically agitated creating a vortex that allows for homogenization of the gas desired for dissolution into the affected aquifer. The technology is applied through installation of the apparatus into treatment wells. The treatment wells are installed as stand-alone wells where hydrogeological conditions are conductive, i.e. sandy aquifers, fractured bedrock aquifers, or in treatment cells where hydrogeological conditions are less conductive, i.e. saturated sediments that are clay rich. The system does not use a compressed gas, compressed air source, or forced air/gas through the use of compressors or blowers. Rather, it uses cavitation to produce a slight vacuum to draw gas or air through a snorkel apparatus that is attached to the gas mixing chamber of the unit. The unit is installed so that it is submerged in the treatment well below the water table.

Abstract: An apparatus is provided for separation of suspended solid particles from fluids, for separation and mixing of fluids, and for dissolving gases in aqueous fluids. The apparatus employs a grooved ring to divide the fluid stream and impart a high velocity on each of the divided or sub-streams. A grooved ring with any number of grooves that may be spiral in shape is used to create a high velocity circular motion on a divided stream for separation of suspended solid particles by centrifugal force in a cyclone filter and for saturation of liquid with gases in a fluid mixer where gases are introduced through a diffuser. A grooved ring with any number of grooves that may be radial is used in a fluid mixer to divide a stream of fluid, produce a high velocity flow through each groove, introduce a second fluid through an orifice into the first fluid flowing through each groove, and direct the fluid mixture to a center impact zone where the various streams collide to complete the mixing.

Abstract: Wastewater treatment apparatus comprising at least one pre-tank and a reactor tank between which a transfer connection is provided to enable wastewater to be transferred from the or each pre-tank to the reactor tank. The reactor tank is provided with a biomass and aeration equipment to enable the wastewater to be treated in the reactor tank. The capacity of the pre-tank or pre-tanks enables it or them to retain the storm flow for a sufficient period of time. The or one of the pre-tanks is provided with a storm overflow, whereby even in storm conditions the reactor tank remains effective and settled solids from the storm flow in the pre-tank or one of the pre-tanks are transferred at intervals to the reactor tank. In the event of persistence of the storm conditions, excess wastewater is released via the storm overflow without interrupting operation of the reactor tank.

Abstract: Methods and apparatus employing membrane filtration in biodegradation processes for treatment of wastewater are described. A bioreactor system is described having an equalization system, a membrane bioreactor system, and a controller. Aeration systems for a membrane bioreactor, such as a mixer, and an ultrafilter subsystem are also described, as is a rotary membrane ultrafilter.

Abstract: The invention relates to a method of biological treatment of wastewater by means of activated sludge, wherein the wastewater is introduced first into an aerated activated sludge tank (B tank) and then by turns into one of several sedimentation and recirculation tanks (SU tanks), which are permanently linked with said B tank and in which a separation of activated sludge and clear water occurs, and after separation activated sludge is returned to the B tank and clear waters is drawn off; several times a day, in the SU tanks an operating cycle proceeds comprising a stirring phase (R phase), a pre-settling phase (V phase) and a discharge phase (A phase). In the R phase the activated sludge is remixed with the water, in the V phase the activated sludge settles down and in the A phase clear water is drawn off (single basin technique).

Abstract: A surface aeration impeller for use in a biochemical oxidation tank. The impeller is rotatable about an axis perpendicular to the static liquid surface. The impeller has a plurality of blades mounted on the underside of a disc or disc-like surface. Each blade has a multi-faceted or curved geometry ranging from vertical at the point of attachment to the disc to partially inclined at the bottom. The blades are spaced circumferentially about the axis and are disposed at acute angles to radial lines from the axis of rotation of the impeller. The lower portions of the blades, which are inclined but non-vertical, are positioned at or below the static liquid surface. When the impeller is rotated, the lower portion pumps the liquid up onto the vertical portion of the blades where the liquid is discharged into a spray umbrella in a direction upwardly and outwardly away from the impeller.

Abstract: Disclosed is a system and method of digesting raw animal waste using diffusers to force circulation and aerate a digesting lagoon. Several lagoons may be used in series to treat raw waste and different variations may be employed to successively digest raw waste. Aeration with slightly ozonated air facilitates a blend of aerobic and anaerobic microbes to quickly and completely digest large amounts of raw animal waste.

Abstract: A sealed filtration system includes a housing, having two chambers, that can be submerged. One chamber houses a plurality of subchambers in which various filter media are located, and the other chamber houses a submersible pump or additional filer media. A drain chamber and port is also defined within the housing for each chamber. An external pump can be to the housing.

Abstract: The present invention concerns equipment for the leaching of solid matter from a sludge with the aid of a gas containing oxygen, the said equipment comprising a tall reactor (1) equipped with a central pipe (2) and from the reactor bottom (3), an upward-directed double-action mixer (5). The mixer is situated in the vicinity of the lower edge of the central pipe: the upper blades (13) of the mixer produce a downward suction flow from the central pipe, and the lower blades (14) disperse the gas to be fed into the sludge in the form of small bubbles, thereby preventing the solid matter from settling to the bottom of the reactor.

Abstract: A digester is provided for aerobically and microbially digesting a batch of bodily waste material, such as an aqueous slurry of pig manure. The digester comprises side-by-side digestion and separation compartments, separated by a partition wall. A first slanted pipe extends through the wall and has its inlet at the lower end of the separation compartment. Pressurized air is injected into the inlet so that slurry from the separation compartment is drawn into the bore of the first pipe, is mixed and aerated therein and is ejected into the slurry in the digestion compartment as a powerful jet. The jet establishes a vertical circulation in the digestion compartment. Slurry, containing undigestible solids, drains through a second pipe from the central core of the circular flow into the separation compartment. Here the aerated non-digestible solids tend to float and can be removed.

Abstract: A bioreactor that has an internal sludge return function for treating wastewater is provided. Said bioreactor comprises a mixing zone (18), a static zone (28), and a mixed liquor circulation channel (26). The internal sludge return is accomplished by the integration of said static zone (28) that settles sludge, and said mixed liquor circulation channel (26) that provides a circulating stream of the mixed liquor for carrying settled sludge back to the mixing zone (18). Therefore, the microorganism concentration in the bioreactor of this invention is increased compared with conventional suspended-growth bioreactors, resulting in the improved wastewater treatment performance, reduced bioreactor size, simplified operation, reduced clarifier size, etc. The bioreactor of this invention can be operation in aerobic, anoxic, and anaerobic conditions to serve various wastewater treatment purposes.

Abstract: An enhanced activated sludge wastewater treatment method increases volumetric pollutant loading, hydraulic loading capacity and nutrient removal efficiency at a conventional activated sludge wastewater treatment plant. The method describes the control of return activated sludge rates, and the operation of partitioned aeration and reaeration zones according to measured properties of the mixed liquor to achieve the claimed benefits. Operating an existing treatment plant according to the enhanced treatment method provides a more consistent treatment process that is resistant to shock loading and increases plant capacity without the need for costly construction and operation of additional reactors and clarifiers.

Abstract: Method of purifying wastewater charged with organic matter which comprises a step of biologically treating the water, during which the organic matter contained in the water is degraded by micro-organisms thereby producing sludge, and a water-sludge separation step, the sludge coming from the separation step being recycled in the biological treatment step, this method being characterized in that it further comprises a step of degrading the sludge, coming either from the biological treatment step or from the separation step, during which the sludge is brought into contact with an ozonated gas under conditions making it possible to obtain a floc consisting of granules whose mean size is greater than 200 microns, the volatile matter content is between 50 and 65%, the thickening factor of this granular sludge, after 30 minutes of settling, always being greater than 4, the conditions for obtaining the said granular sludge consisting in: treating between 0.

Abstract: The present invention provides a method of treating groundwater or other water stream(s) contaminated with an oxygenate to degrade said oxygenate which comprises: a) inoculating a biodegrader capable of degrading said oxygenate on a packed activated carbon bed through a rigid tubular instrument having a plurality of holes in the part of the rigid tubular instrument used for inoculation of the carbon bed; and b) flowing said groundwater, or other water stream contaminated with said oxygenate through a structure having a top, bottom and sides and a predetermined volume containing said bed of activated carbon having said biodegrader inoculated thereon. and an apparatus for the same. The method is particularly effective for treating water contaminated with methyl t-butyl ether (MTBE) and/or t-butyl alcohol (TBA).

Abstract: An apparatus for preventing formation of a solid or semi-solid surface layer in liquid waste contained in a wet-well includes an air pump adapted to pump air into the wet-well and an air pump controller configured to activate and deactivate the air pump at selected times. Also included are a plurality of air injectors disposed in the wet-well and operatively coupled to the air pump. The air injectors inject the air into the liquid waste causing a stream of air bubbles to rise in the liquid waste. The air pump controller activates the air pump for a predetermined period of time so that the stream of air bubbles produced within the liquid waste causes turbulence within the liquid waste so as to disrupt and break up solids or semi-solids on a surface of the liquid waste to prevent the formation of the solid or semi-solid surface layer.

Abstract: A submerged, vertically-mounted membrane device, the device receiving a gas-sparged feed stock at a bottom feed inlet to provide airlift circulation of the feed stock through the device and separating the feed stock into filtrate and residual gas-containing retentate which passes from the top end of the device. The device comprises a structure of one or more monolith segments of porous material each monolith segment defining a plurality of passageways extending longitudinally from a bottom feed end face to a top retentate end face. A porous membrane is applied to the walls of the monolith segment passageways to provide a separating barrier. At least one filtrate conduit within the device carries filtrate from within the device toward a filtrate collection zone of the device, and the filtrate conduit provides a path of lower flow resistance than that of alternative flow paths through the porous material. A seal is provided to separate feed stock and retentate from the filtrate collection zone.

Abstract: Oxygen depleted wastewater is introduced as a stream into the top of a vessel containing a set of perforated triangular vanes arranged to rotate about a vertical axis. The stream is directed downwardly in the vessel along a path that traverses the path of the rotating vanes so the vanes impact the stream. The force of the impact of the vanes against the stream and the perforations in the vanes cooperate to create a fine droplet mist in the vessel. Atmospheric air drawn into the vessel is mixed and entrained in the mist so that when the mist coalesces, micro-fine size air bubbles are formed. The triangular vanes further provide a pumping action to expel a now aerated stream of wastewater from adjacent the bottom of the vessel.

Abstract: A filtration apparatus includes a laundry waste sump, a primary 50 micron static screen filter, a 9,000 gallon equalization tank, at least one secondary media/carbon filter, a sludge holding tank with a pump to return excess water to the equalization tank, a backwash pump, an air blower, and a clear well tank water source for backwash. An exemplary embodiment of the invention also includes a surge tank between the primary and secondary filters and a surge tank between the secondary filter and the clear well tank.

Abstract: A floating pump assembly including a compact floatation assembly structured to float on a body of water and supporting a flow pump housing having an inlet, outlet and fluid drive assembly being submerged and wherein at least the outlet is oriented in a predetermined, preferably horizontal orientation during operation and activation. A power assembly is supported on the floatation assembly and is drivingly connected to the fluid drive assembly for powered operation thereof. The predetermined orientation of at least the outlet and particularly the direction of discharge of water issuing from the outlet substantially is such as to eliminate or at least minimize the tendency of the floatation device to become disoriented or unstable at least in terms of being increasingly submerged into a deeper position within the body of water upon activation and operation of the floating pump assembly.

Abstract: Wastewater is delivered to a single tank of a bioreactor system to undergo biological treatment. After undergoing such biological treatment, the wastewater is centrifugally separated outside the tank into contaminated portions with lowered and increased concentration of solids therein to respectively undergo filtration within a small volume chamber of the tank and continuous return to a large volume chamber for biological retreatment during operation of the bioreactor system. Under different conditions of the wastewater delivered to the tank, one of the separated portions of the biologically treated wastewater is disposed of by direct discharge in by-pass relation to the small chamber when delivery thereof into the small chamber is interrupted under selective valve control.

Abstract: A separating device (10) especially for use in a pneumatic flotation system comprises an annular channel (18), at least one nozzle (16) for introducing aerated pulp substantially horizontally and tangentially into the annular channel (18), froth extraction means (26) for the removal of separated froth from the annular channel (18), and pulp extraction means (24) for the removal of separated pulp from the annular channel (18), the at least one nozzle (16) being configured so that the aerated pulp introduced into the annular channel (18) rotates therein with centrifugal forces of between 5 and 20 ms−2.

Abstract: Disclosed is a system and method of digesting raw animal waste using diffusers to force circulation and aerate a digesting lagoon. Several lagoons may be used in series to treat raw waste and different variations may be employed to successively digest raw waste. Aeration with slightly ozonated air facilitates a blend of aerobic and anaerobic microbes to quickly and completely digest large amounts of raw animal waste.

Abstract: In this neutralizing apparatus, aerobic microorganisms are propagated on a vinylidene chloride packing material 10 provided in a neutralization tank 3. The aerobic microorganisms produce nitric acid ions from organic alkaline wastewater introduced from a raw water tank 1 and thereby the organic alkaline wastewater is neutralized. Thus, various kinds of alkaline wastewater can be neutralized without using a mineral acid as a poison such as hydrochloric acid or the like.