Abstract: A chip treatment device 100 includes a box-shaped housing 110, and an upper surface panel 112 of the housing is connected to a sloped portion 114. The interiors of the housing 110 is divided into upper and lower areas by a partition panel 130, and to the areas are provided a first cutting fluid bath 150 and a second cutting fluid bath 160. Chains 240 stretched between driving sprockets 210 and chain guide units 230 are equipped with scraper units 250 moving in the direction of the arrow. The chips coming in from an entrance opening 180 is separated from cutting fluid while being conveyed on the separation panel 130. First and second filter units 170, 300 filter said cutting fluid.

Abstract: A water purification system including a rectilinear housing having a plurality of vertical baffles spaced therein. The ends of each of the baffles are located a certain distance below the housing upper edge or above the housing floor to allow for the flow of washwater therethrough from a housing inlet to a housing outlet. A rectilinear array of media, e.g. corrugated plastic, is located between the baffles for harboring bacteria, and an air supply means is provided therebeneath. A feeder mechanism is also provided on an exterior wall of the housing for feeding supplemental bacteria into the housing to make up for bacteria depleted through the operation and use of the system.

Abstract: A system is described for improving separation of sewage containing wastewater, oleaginous materials and solids. The system includes a tank 10 having a first chamber 12 and a second chamber 14. In the first chamber oleaginous materials rise to an upper portion thereof and a grinder pump 30 grinds the solids that descend toward the bottom of the first chamber. The second chamber in communication with the first chamber delivers the sewage to a discharge line 24 in communication with a transport line that leads to a downstream sewage treatment plant. A conduit 32 conducts the slurry of the ground solids from the first chamber to the discharge line. A pressure relief line 40 running from the conduit releases the head pressure into the first chamber. The pressure relief line is connected to the conduit downstream of the conduit's highest point of elevation.

Abstract: A filtration system that is coupled to a fluid flow for creating a uniform horizontal fluid flow through the filtration system to remove impurities from the fluid flow. The filtration system includes a filter having an inlet region, an outlet region, and a filter housing fluidly coupled between the inlet region and the outlet region. The inlet region includes an inlet pipe and a mixing chamber for creating a uniform horizontal fluid flow through the filter. The filter housing includes a removable filter element that receives the uniform horizontal fluid flow and removes impurities from flow, and the outlet region discharges the flow from the filter. In one embodiment, the inlet pipe includes a planar discharge end that is angled with respect to the horizontal axis of the fluid, and the mixing chamber includes a closed end, which the fluid flow strikes as it exits the inlet pipe to create a uniform horizontal flow through the mixing chamber.

Abstract: Flotation apparatus (1) for the purification of polluted water, comprising a flotation vessel (3) having an inlet means (23) for supplying polluted water to said vessel, an assembly (41) of spaced elements (43, 65) defining passages for the flow of water through said elements, and outlet means for surface sludge (15, 17) and outlet means (39, 45; 57, 61) for treated water, further comprising flow directing means for forcing the incoming polluted water to reach a level above said assembly (41) and to flow downwardly through said assembly and towards said treated water outlet means (39, 45; 57, 61); and a process for the purification of polluted water by flotation performed in such apparatus.

Abstract: A method for filtering hydrocarbon contaminated water for separation and recovery of the contaminants and recirculation of the water, wherein the water contaminated by hydrocarbons is, in a series of successive stages, caused to flow down through a cushion of a filtering hydrocarbon that floats on a defined surface of a water body and is permitted to flow via an underflow into the free portion of the water body prior to transfer via an overflow to the next stage, and where, in a final stage, approximately anhydrous hydrocarbon is drawn off as overflow while hydrocarbon-free water is removed as underflow, is carried out with the aid of an apparatus which, in operable state, comprises a series of successive basins filled with water (2, 3, 4) separated by walls (22, 23), where an upper part of each basin is bounded by means of fixed partition walls (32, 33) projecting downward in the water and is filled with a filtering hydrocarbon (12, 13, 14), where the final cushion of filtering hydrocarbon (14) downstream is

Abstract: Reject waste water adapter coupling fitting, system and installation method for use with a household undercounter reverse osmosis (R/O) water filtration installation associated with an in-counter sink having a garbage disposer with its outlet connected by standard slip fit plumbing fittings to a sink drain trap plumbed to the household sewer system. The R/O reject waste water undercounter drain line is coupled into the sink drain trap in parallel drainage relation with the disposer outlet plumbing fittings by a baffle Tee plumbing fitting having first and second inlets perpendicular to one another with their input drainage liquid flow separated by an internal baffle. The garbage disposer outlet is coupled by a standard slip fit single inlet/outlet conduit plumbing fitting to the baffle Tee first inlet. The baffle Tee has a single outlet slip coupled to the inlet of the trap.

Abstract: A compact, self-contained skimming system for removing waste material from aqueous cleaning solutions used in parts washers. A single tank contains a sloped floor, two compartments separated by a baffle, and an opening between a bottom edge of the baffle and the floor. Waste liquid collects in the first stage compartment, where gravity initially separates water and coarse debris from the waste material containing oil and grease, some water, and fine debris. A partially immersed rotating skimmer further adsorbs the waste material. A waste collection system transfers the waste material to the second stage compartment, where gravity further separates the fine debris and additional water from the oil and grease. The oil and grease flow through a waste drainage system out of the second stage compartment. The fine debris and water flow along the downwardly sloping floor, through the opening at the bottom of the baffle back into the first stage compartment.

Abstract: An oil suction filter having an enclosed housing with a base surface and an oil intake opening, a top surface with an oil discharge opening, and a filter usually in the form of a filter cloth in the housing between the intake opening and the outlet. In one form, an oil diverting device at least partially surrounds the oil intake opening. In another form, an oil flow diverting device is provided at either or both of the oil intake opening and the oil outlet. In another form, an oil filter cloth has various densities, thicknesses or layers that control the flow. All the foregoing is for the purpose of minimizing formation of large air bubbles passing through the suction filter. Further, beads in the housing may keep the filter cloth off the base surface.

Abstract: A drainwater treatment system positionable within a horizontal flow passage of a drainage system utilizes a partition which divides the flow passage into an upstream chamber and a downstream chamber. In addition, a mid-panel is supported within the upstream chamber for dividing the interior of the upstream chamber into an upper section and a lower section so that the drainwater enters the upper section before entering the lower section through a first opening provided in the mid-panel. A conduit is also joined between a second opening provided in the mid-panel and the opening of the partition for conducting drainwater from the lower section of the upstream chamber to the downstream chamber so that the drainwater which enters the upper section and then into the lower section is decelerated to flow conditions at which debris and suspended are permitted to separate and settle from the drainwater before being conducted from the lower section and into the downstream chamber through the conduit.

Abstract: A clarifier for use in treating a liquid containing non-soluble particles in suspension in order to separate these particles from the liquid includes a tank, a liquid supply duct opening into the bottom portion of the tank and an injector for injecting a gas under pressure into at least part of liquid supplied to the supply duct in order to saturate this liquid with the gas and thus to generate gas bubbles as the saturated liquid is subject to depressurization within the tank. The gas bubbles that are so generated adhere to the particles in suspension in the liquid and lift them up to form a floating layer of sludge in the top portion of the tank. A scraper is provided in the top portion of the tank for skimming off the layer of sludge while it is formed. A plurality of plates extend at an angle within the tank above the supply duct. These plates define a set of upwardly inclined channels each having an upper end that is opened and through which the liquid fed into the tank may enter the channel.

Abstract: A combination filter element comprising a bundle of hollow microporous fibers housed within an extruded carbon block, wherein the carbon block is fabricated to balance particle retention capacity against absorption capacity to provide a composite filter with desirable pressure drop, filter life, and particulate and chemical contamination reduction, and a filtration device, in which combination filter element may be employed, having a base portion including a sump which has an inlet and an outlet and a base which has a reception port for receiving the filter element.

Abstract: A combination water filter tank, which includes a rectangular housing, three transverse partition boards disposed in the housing and defining a first sedimentation chamber, a second sedimentation chamber, a third sedimentation chamber and a fourth sedimentation chamber, a water inlet for guiding water from an external water source into the first sedimentation chamber, a plurality of first longitudinal partition boards of different heights respectively disposed in the first sedimentation chamber, three L-shaped water guide boards respectively suspended in the second sedimentation chamber, third sedimentation chamber and fourth sedimentation chamber, a plurality of second longitudinal partition boards respectively disposed in the second sedimentation chamber, third sedimentation chamber and fourth sedimentation chamber on the middle at an elevation below the L-shaped water guide boards, and a water outlet for guiding water out of the fourth sedimentation chamber.

Abstract: A self-contained wastewater treatment system is provided, comprising a vessel having a bottom, side walls and a lid defining a hollow interior for containing wastewater, the vessel being adapted for installation underground; an influent line; an effluent line; and a baffle disposed within the interior, generally between the influent line and the effluent line and extending transversely toward opposing side walls of the vessel. The baffle includes a bottom edge separated by a predetermined distance from the bottom of the vessel to define a flow opening. The position of the baffle defines an upstream aeration chamber and a downstream clarifier chamber within the vessel. The side walls include a downstream end wall, the downstream end wall having a lower inclined wall which intersects the bottom of the vessel adjacent the flow opening.

Abstract: Tank cleaning system is formed by an upper deck having a spout potion and a deck portion, injectors and a separation chamber having a conical bottom wall and a top formed by a waste baffle. The injectors connect the deck portion with the separation chamber so that the waste baffle and upper deck are axially separated to provide an outlet passage therebetween. The injector passages direct water through the upper deck and waste baffle into the lower chamber and impart a significant velocity component tangential to the chamber to the water flowing therethrough to impart a helical flow to the water in the chamber. A debris outlet passage is provided adjacent to the bottom of the lower portion of the chamber. The dirt laden stream enters the chamber through the injectors and dirt is separated by centrifugal action in the chamber and rejected through the debris outlet while the cleaned water passes through the outlet passage and is returned to the surrounding water.

Abstract: An apparatus for separating contaminants from a fluid stream is disclosed. The apparatus comprises a vessel containing a gas blanket. The apparatus will have contained therein a water skimmer member adapted for allowing for retention of the fluid stream. The apparatus further includes a first gas flotation cell contained within the vessel and arranged in series with the water skimmer so as to receive the fluid stream. Also included is an oil bucket positioned within the vessel and adapted to receive a portion of the fluid stream from the water skimmer and the first gas flotation cell. In one embodiment, the first gas flotation cell comprises a first screen member having a porous structure, a plate baffle having a first passage therein, and an eductor device adapted for introducing a gas stream into the fluid stream.

Abstract: There is described a method for the separation of liquids of different densities that are not soluble in one another, such as water and oil, where a liquid mixture is placed in a tank in which heat is optionally supplied to the liquid mixture, and separation occurs as the liquid having the highest density sinks toward the bottom of the tank and forms a layer (a) where it may be tapped off, and the liquid having the lowest density rises and forms a layer (c) at the top of the tank (1), and that between the separated liquids is a mixed layer (b) comprising a mixture of the liquids, where the liquid mixture to be separated is fed into the tank in a manner generating the least possible vertical liquid flow, and where the liquid mixture is fed into the tank through one or more outlets that are disposed in a closed-off section of the tank. Also described is an apparatus for carrying out the method.

Abstract: An apparatus for filtering machine coolant which includes a filtering belt conveyor having a series of bars on the outer surface of the filtering belt conveyor. The filtering belt conveyor is located inside of a tank along with a separate drag conveyor which removes fines that are sprayed off the filtering belt conveyor. There is a partition in the tank between the filtering belt conveyor and the separate drag conveyor.

Abstract: Reject waste water adapter coupling fitting, system and installation method for use with a household undercounter reverse osmosis (R/O) water filtration installation associated with an in-counter sink having a garbage disposer with its outlet connected by standard slip fit plumbing fittings to a sink drain trap plumbed to the household sewer system. The R/O reject waste water undercounter drain line is coupled into the sink drain trap in parallel drainage relation with the disposer outlet plumbing fittings by a baffle Tee plumbing fitting having first and second inlets perpendicular to one another with their input drainage liquid flow separated by an internal baffle. The garbage disposer outlet is coupled by a standard slip fit single inlet/outlet conduit plumbing fitting to the baffle Tee first inlet. The baffle Tee has a single outlet slip coupled to the inlet of the trap.

Abstract: An improved fuel filter cartridge can be used with a header of a conventional fuel filter assembly. The cartridge has a water coalescing sock filter enclosed within a housing and a generally conically shaped water separating baffle with a spiralling rim and an outer barrier at the lower periphery of the baffle. As water droplets coalesce and fall off the bottom end of the sock filter, they are intercepted by the water baffle and coalesce on the radially inward side of the downwardly spiralling rim and the radially inward side of the outer barrier. As the water droplets spiral outwardly toward the outer barrier, they agglomerate. The water, thus separated and routed away from the fuel stream, exits the water baffle at an outlet of the outer barrier and falls to the bottom of the filter cartridge under the influence of gravity.

Abstract: A method and apparatus for separating immiscible liquids and solids from a influent stream employing a pre-coalescing unit to remove solids and larger liquid particles followed by a coalescing function which separates any remaining oil, grease and the like from the influent stream. The separator tank comprises three chambers, one of which comprises a series of debris plates made of perforated oleofilic material which traps solids and large particles in the first chamber and passes the partially separated liquid to a second chamber containing closely spaced coalescer plates which remove the remaining unwanted particles. In the third chamber, the effluent stream is prepared for reintroduction into the environment. The separator unit of this invention uses the combination of enhanced coalescing and gravitational separation to improve the separation process and reduce the frequency of maintenance and cleaning of the unit.

Abstract: An apparatus and method are disclosed for environmental applications such as waste water treatment, de-inking of recycled paper, chemical/biochemical waste clean-up, and mineral beneficiation, using a multi-stage flotation column. A series of draft tubes arranged axially and separated by baffles provides individual mixing stages in the flotation column and a special gas distributor generates fine gas bubbles. The draft tubes create repetitive loop flow of the feed fluid in each flotation stage. This provides uniform distribution of the gas bubbles throughout the column and significantly enhances mixing and contacts of the gas bubbles with the impurities to be removed.

Abstract: A self-contained wastewater treatment system is provided, comprising a vessel having a bottom, side walls and a lid defining a hollow interior for containing wastewater, the vessel being adapted for installation underground; an influent line; an effluent line; and a baffle disposed within the interior, generally between the influent line and the effluent line and extending transversely toward opposing side walls of the vessel. The baffle includes a bottom edge separated by a predetermined distance from the bottom of the vessel to define a flow opening. The position of the baffle defines an upstream aeration chamber and a downstream clarifier chamber within the vessel. The side walls include a downstream end wall, the downstream end wall having a lower inclined wall which intersects the bottom of the vessel adjacent the flow opening.

Abstract: The wastewater treatment unit is operable under high intermittent flow rate variations. It comprises a first clarifier in which is carried out a gravitational settling of solids and a second clarifier comprising a network of parallel plates inclined with respect to the vertical and a portion defining a collecting pit. Each plate has an upper edge positioned at a height lower than the filling level of the first clarifier to define an overflow giving access to the collecting pit. The network of plates allows to carry out a further settling of solids to create a counterflow of settled matter toward the first clarifier and a flow of clarified wastewater falling in the collecting pit. A filtering chamber is positioned above the first clarifier and comprises a filtering media supporting a biomass for digesting the organic content of the wastewater coming from the second clarifier.

Abstract: A centrifugal oil filter in which a cylindrical housing 42 is rotatable by the reaction force from oil jets 56 leaving via nozzles 44, is increased by the provision of ribs 54 on the inner wall surface of the cylindrical housing 28. This enables the cylindrical vessel 42 to be provided with an internal coarse oil filter while allowing an increase in acceleration and rotational speed.

Abstract: An apparatus for cleaning a separator is disclosed. Generally, the apparatus includes a vessel connected to a well that produces an effluent. The vessel is used for separating the effluent. Also included is a discharge member which is attached within the vessel for discharging a liquid onto solids located at the bottom of the vessel, and a drain adapted for draining the solids from the bottom of the vessel. The apparatus may further include a chemical injection device, operatively associated with the discharge member, for injecting a radioactive dissolution chemical. A process for cleaning the vessel and treating the entrained solids of the effluent with the radioactive dissolution chemical is also described.

Abstract: An apparatus for separating contaminated waste water into a substantially uncontaminated homogeneous extract water portion and into a heterogeneous raffinate fluid portion. Upon being subjected to sufficient circular flow, in an environment emulating the action of a centrifuge, the heavier liquid and solid components are caused to gravitate out of the waste water. This apparatus is constructed with an elongated housing means which is preferably disposed between a water storage tank and fluid contaminant discharge device. Contained longitudinally within the elongated housing is a separator chamber having a portion of a frustoconically shaped centrifugation surface which directs the incoming waste water into a turbulent and circular pattern. As the waste water gains momentum during this centrifuge-like flow pattern, it abruptly strikes a substantially vertical impact plate which precipitates the forced separation of the impurities and contaminants from the waste water.

Abstract: A floating cover and baffle system used to vastly increase treatment effectiveness of wastewater treatment lagoons used to remove pollutants from water. The floating cover prevents direct sunlight penetration which prevents the growth of algae, while allowing air to flow between the cover and the surface of the lagoon to maximize oxygen transfer. The baffle system consist of several aerobic baffles and anaerobic baffles. The aerobic baffles are located perpendicular to the direction of flow of wastewater and directs the flow into the upper region of the lagoon which is where aerobic micro-organisms prevail and there is the most available oxygen. The baffles are also secured at a thirty degree angle with the bottom of the lagoon in order to minimizing solids settling and prevent the accumulation of solids in a concentrated area which can cause odor problems.

Abstract: A system for cleaning and recycling a deburring compound includes apparatus for removing both ferrous and non-ferrous solids from the fluid by providing an upwardly inclined filtering chute having a top surface on which the fluid is forced to flow upstream around a plurality of baffles for enhancing the settlement of solids from the fluid on the chute. The chute is also provided with a plurality of magnets on its bottom surface creating a magnetic field for enhancing the removal of ferrous solids from the fluid. The filtered fluid is further strained through a series of filter bags and a filter cartridge to remove any remaining solids and recycled. The chute is readily disassembled for easy cleaning to save down time.

Abstract: Apparatus for clarifying produced water. A flotation chamber has a produced water inlet, a clean water outlet, and is segmented into a plurality of cells by baffles. An oil overflow compartment is in fluid communication with the upper portion of the chamber. Produced gas is introduced into each cell of the flotation chamber by porous sparger tubes creating bubbles of 100 to 1000 microns in diameter. The bubbles rise through the water removing any suspended oil particles. The gas exits through a gas outlet. The removed oil collects on the liquid surface of the produced water and overflows to the overflow compartment. Oil is removed from the overflow compartment via an oil outlet.

Abstract: A wastewater treatment system and method for substantially reducing or eliminating total suspended solids (TSS), biological organic discharge or biochemical oxygen demand (BOD), and fats, oils and greases (FOG) contaminants. The system includes at least one mixing chamber for mixing wastewater with at least one dewatering agent or chemical and air to form an aerated mixture and at least one tank having a plurality of compartments for facilitating flotation, settling and removal of contaminants from the aerated mixture as it flows through the tank. Preferably, the system includes first and second mixing chambers and first and second tanks arranged in series with each of the tanks including drag lines for removing floating and settled contaminants.

Abstract: A dissolved air flotation (DAF) system and method for gas-liquid contacting operations. A mixture of untreated liquid and liquid saturated with dissolved air is passed through a series of upward deflecting screens placed across the flowpath in a rectangular tank. Microbubbles of air released from the mixture produce a buoyant force which carries contacted particles to the surface. Floated particles released from the microbubbles form a sludge which is supported above the surface of the mixture by a layer of air derived from the microbubbles. A top layer of the sludge is skimmed off according to a predetermined residence time of sludge at the surface. Liquid containing dissolved air is also introduced downstream of each deflecting screen to enhance flotation and clarification.

Abstract: An apparatus for separating a contaminated liquid diesel fuel and the like into a substantially uncontaminated homogeneous raffinate fuel portion and into a heterogeneous extract portion. Upon being subjected to sufficient circular flow, in an environment emulating the action of a centrifuge, the heavier liquid and solid components are caused to gravitate out of the diesel fluid and the like. This apparatus is constructed with an elongated housing means which is preferably disposed between the fuel tank and fuel filter of a diesel engine and the like. Contained longitudinally within the elongated housing is a separator chamber having a portion of a frustoconically shaped centrifugation surface which directs the incoming impure and contaminated fuel mixture into a turbulent and circular pattern.

Abstract: A system for removing particulates, formed as metal is machined, from coog and lubricating fluid. The system has a tank filled with fluid. The bottom of the tank slopes forward. The tank receives contaminated fluid at its top rear. The contaminants are swarf (chips removed from the workpiece) and fines (which come both from the workpiece and the grinder, borer, or drill). After the swarf is removed from the contaminated fluid by a magnetic filter, only fines remain. The fluid contaminated with fines flows from back to front in the tank, passing under a baffle projecting vertically downward from the top of the tank. A whoosh plate causes the fines to settle out into the tank, while uncontaminated fluid flows over the whoosh plate and is reused. The fines collect at the tank's bottom, from where they are pumped out and mixed with the magnetically-removed swarf for removal.

Abstract: A process for the anaerobic digestion of organic carbonaceous material is disclosed. The process includes the steps of (a) hydrolyzing organic carbonaceous material to produce a digester stream including hydrolysis products; (b) subjecting the digester stream to a first methanation phase operating at thermophilic conditions to produce a gaseous product including methane; and (c) subjecting the digester stream to a second methanation phase operating at mesophilic conditions to produce further gaseous product including methane, and to recover heat. An apparatus for the anaerobic digestion of organic carbonaceous material is also disclosed.

Abstract: There is disclosed a fermentation device having a peripherally extending wall, a gas-impermeable cover extending over the surface of the device, and attached at its peripheral edge to a top part of the wall, and a gas collection conduit extending for at least part of the periphery of the device within the wall. This device may be used for wastewater treatment enclosures.

Abstract: A system for the reduction and separation of highly emulsified and/or immiscible components mixed in a fluid, particularly useful for treating waste water contaminated with oils and oily emulsions, as from depleted oil wells, vehicle washing stations, and meat rendering plants. The system is operative for reducing the amount of organic and inorganic contaminants, and is particularly suitable for reducing the amount of oil, with oil-consuming microorganisms, and separating oil that is not consumed within the system from the water so that the oil may be recycled and the water discharged into wetlands or sanitary sewers without further treatment. The system comprises a multi-stage, recirculating series of treatment tanks. In a first stage, the fluid is recirculated through a treatment loop where the fluid is aerated and then passed through a coalescer.

Abstract: An energy conserving method and apparatus for using induced gas flotation to separate finely dispersed oil and solids from water and doing so in such a manner as to minimize the power consumption, reduce the amount of water carried with the oil and solids skimmings and eliminate complex mechanisms that would require a high degree of maintenance.Initial flotation gas is induced through a high velocity venturi using the inlet flow to supply the kinetic energy. Secondary flotation is supplied by inducing the vapor through a high velocity venturi utilizing recycled water to provide the kinetic energy. A single pump, of relatively low horse power, circulates the recycled water.The oil and solids skimmed from the surface of the water are transferred to an integral compartment for dewatering. The water is returned to the process stream by the single recycle pump.

Abstract: A grease/oil/water separator device and assembly for a vehicle wash system having a grease/oil/water separator tank which has three tank compartments. A first tank, a settling tank, is provided with entrance and exit piping such that a diagonal cross-flow of water allows sludge and debris to fall to the bottom of the settling tank. Water enters a second tank, the trap tank, from the settling tank, the trap tank being provided with entrance and exit piping such that a diagonal cross-flow of water is created so as to allow oil and grease to be separated from the water with the exit piping being located at the bottom of the trap tank which then enters the third tank, the pump tank where the grease and oil separated water is pumped into a sand filter which further filters the water.

Abstract: The disclosure relates to a method and an apparatus for separating particles suspended in a flowing liquid for cleaning a current component. The apparatus has a body that can be submerged below the surface of the flowing liquid. The body is hollow and has at least one outlet for the liquid to exit or be removed through, its upstream end is connected to its downstream end by an essentially smooth shaft, the downstream end is to some extent surrounded by a series of baffles, having a gap between each baffle and there are intakes into the body in the shaft between the baffles. The flow is diverted and reversed below the surface of the fluid such as to produce a zone of turbulence around an extensively quiescent center, whereby the turbulence allows the heavier and more inert particles to travel on, while a current component of lighter-weight molecules with few or no particles and accordingly cleaner continuously enters the quiescent center, where it can be analyzed or continuously extracted outside the system.

Abstract: The waste water which is discharged from the anaerobic treatment stages of biological waste water treatment plants still contains highly volatile organic substances which, if not biodegraded, escape into the ambient air and lead to unwelcome odors. Also, the exhaust air of the anaerobic treatment stage may contain such highly volatile substances. An escape into the ambient air can be prevented if the waste water which is discharged from the anaerobic treatment stage is aerated with exhaust air sucked off from the anaerobic stage and if this exhaust air, after the aeration, is then fed to a spray washer and compost filter. The water for the spray washer is taken from the discharge of the anaerobic stage and returns there.

Abstract: A wastewater treatment system for treating wastewater containing undesirable pollutants which comprises a housing having a bottom and defining an internal chamber. The internal chamber is provided with a first and second baffle member which cooperate to define a mixing zone and a separation zone. Wastewater (containing a sufficient amount of air so that the air present in the wastewater exceeds the solubility of air in the wastewater) is introduced into the mixing zone of the internal chamber, and an aerated water is sprayed into the wastewater to produce a quantity of air bubbles sufficient to promote the flotation of pollutants having a density approximately equal to that of the wastewater to form a froth. Pollutants having a density substantially greater than the density of water settled to the bottom portion of the housing. An effluent reservoir assembly (which forms a reservoir zone) is spatially disposed from the second baffle member so that a quiescent zone is formed therebetween.

Abstract: In a non-agitational, countercurrent flow type of liquid-liquid contacting tower, splitter plates with plural slits and/or holes through which light and heavy liquids flow, and baffles having the appropriate shapes and areas in order to cover the liquid flowing upward or downward, are alternately mounted horizontally inside the tower shell in vertical direction. The ratios of the opening area to the total cross-sectional area in the splitter plate are 10% to 40%, and the opening area of a baffles is larger than the aperture area of a splitter plate. The advantages of this invention are as follows: Because of the high contacting efficiency, a relatively smaller contactor has an equivalent performance with that of a larger contactor; there exists no risk of plugging due to scum accumulation, and maintenance is easy.

Abstract: This invention pertains to a multi-stage separator vessel through which the to-be-cleaned fluid flows. Aeration assemblies within the inner cells disperse micro-fine gas bubbles into the fluid for cleaning purposes. Additionally, the inlet piping contains a separator that begins the separation process before this fluid is discharged into the first cell. An L-shaped passageway interconnects the various flotation cells of this separator with the entrance of each such passageway being at an elevation below its exit. A weir is located within each flotation cell that is adjustable as needed. This weir empties into a channel alongside the separator vessel that collects the separated contaminants flowing over the weir for later disposal.

Abstract: A device is provided for separating oil and fat from a liquid mixture. The device includes a tank divided by a baffle plate into two separate compartments which leaves an opening between the compartments, a baffle disposed at the bottom of the tank for preventing migration of settled solids between compartments and an immersion type recirculation pump that sucks liquid out of one compartment and forces through a filtration device projecting into the tank that contains tubular ceramic membranes.

Abstract: Method and apparatus for removing impurities from a laundry wash effluent including the steps and means therefor of acidifying the solution, infusing a gas into the solution and coalescing the released contaminant droplets by means of baffle plates into droplets sufficient to achieve buoyancy with respect to the solution. The resulting top layer of buoyant droplets is skimmed from the solution and the remaining solution is adjusted to a neutral pH for discharge.

Abstract: A wastewater treatment system for treating wastewater containing undesirable pollutants which comprises a housing having a bottom and defining an internal chamber. The internal chamber is provided with a first and second baffle member which cooperate to define a mixing zone and a separation zone. Wastewater (containing a sufficient amount of air so that the air present in the wastewater exceeds the solubility of air in the wastewater) is introduced into the mixing zone of the internal chamber, and an aerated water is sprayed into the wastewater to produce a quantity of air bubbles sufficient to promote the flotation of pollutants having a density approximately equal to that of the wastewater to form a froth. Pollutants having a density substantially greater than the density of water settled to the bottom portion of the housing. An effluent reservoir assembly (which forms a reservoir zone) is spatially disposed from the second baffle member so that a quiescent zone is formed therebetween.

Abstract: This invention pertains to a multi-st vessel through which the to-be-cleaned fluid flows. Aeration assemblies within the inner cells disperse micro-fine gas bubbles into the fluid for cleaning purposes. Additionally, the inlet piping contains a separator that begins the separation process before this fluid is discharged into the first cell. An L-shaped passageway interconnects the various flotation cells of this separator with the entrance of each such passageway being at an elevation below its exit. A weir is located within each flotation cell that is adjustable as needed. This weir empties into a channel alongside the seprator vessel that collects the separated contaminants flowing over the weir for later disposal.

Abstract: Standing vortices are formed in a liquid flowing with a reversing but mean flow through a conduit, divided into a series of chambers with narrow inlet and outlets by appropriate selection of the chamber aspect ratio, Reynolds number and Strouhal number.

Abstract: A waste water treatment equipment adapted to treat, with high removal performance at all times, waste water drained from various sources such as sewage containing solid wastes left after crushing garbage sent out from cooking room, home kitchen, etc. The equipment is provided with a pretreatment device in which chemical is supplied to a treatment tank so as to accellerate decomposition of the solid waste left after crushing garbage by fermentation and putrefaction, and digestion of the solid wastes and water pollution materials by anaerobic bacteria. The sewage pretreated in the pretreatment device is introduced in a sewage treatment device in which sewage is caused to flow in a plurality of sewage treament tanks sequentially in order, and the pollution materials such as BOD, COD, etc. in the sewage are subject to oxidation decomposition and removal by activated sludge process beds of specific configuration in which arrangement of activated sludge varies for each tank.