Abstract: An additional trough for an aquarium filter container comprising a rectangular body having an open top and consisting of a bottom panel, two long-side panels and two short-side panels, said bottom panel being formed with a plurality of equidistant longitudinal and transverse grooves making a plurality of intersecting points, a perforation being formed on alternate one of said intersecting points and equally distant from each other, said bottom panel further having at the outer side a protruded portion which is smaller than the open top of said rectangular body in area and extends outwardly to a flange and downwardly to form four elongated projections, said bottom panel having an outer side formed with a plurality of annular portions concentric with corresponding perforations.

Abstract: The device of the present invention removes suspended solids from a liquid medium, such as particles in an oil-based sludge. The device includes a filter chamber having an inlet for introducing liquid into the chamber, with the liquid containing suspended solids. The chamber also has an outlet for releasing filtered liquid which is substantially free from suspended solids. The liquid coming into the chamber is forced through a filter element to remove the suspended solids therefrom. The removed solids are compressed in the chamber by a reciprocating piston. When a sufficient quantity of suspended solids accumulate within the chamber, a discharge valve is opened and the compressed solids are discharged from the chamber. The device is operated automatically by a computer, which controls a series of operation cycles, including normal filtering operation, compression of solids, purging of solids, and cleansing of the filter element.

Abstract: A biological waste treatment assembly used between a septic tank and a drain field. There is an upper chamber containing a trickle media bed for aerobic treatment of the effluent, and a sump positioned beneath this. The fresh effluent from the septic tank drains into the sump, and is drawn from this and pumped upwardly through a conduit by a submersible pump. Compressed air is introduced at the base of the conduit so as to aerate the effluent. The conduit is formed of UV-transparent tubing, and this is helically coiled around an ultraviolet light source which serves to destroy fecal colliform bacteria in the effluent. The effluent is then discharged via a spray nozzle onto the upper surface of the aerobic treatment bed, and migrates downwardly through this to a collection pan. A down tube drains the collected effluent directly to a relatively oxygen-free layer in the sump, where secondary anaerobic treatment serves to denitrify the products of the aerobic treatment in the upper chamber.

Abstract: A packed tower bio-reactor having an inlet turbine and a corrugated reactor element is provided. The inlet turbine provides intermittent columns of waste water to the reactor elements thereby permitting alternate slugs of water and air to pass through the reactor element both flowing in the same direction. The reactor media is made up of a roll of single-faced corrugated plastic sheeting and is formed in a packed roll to provide the reactor surface.

Abstract: A bioreactor comprising a reactive vessel having an inlet system for material and a reaction chamber located above the inlet system. The inlet system has outflow openings that are at least partially tangentially oriented. A partition separates the reaction chamber from a chamber in which the inlet system is disposed, and the partition has at least one radial slit formed by two radial edge strips overlapping one another and vertically spaced apart. This slit interconnects the chamber in which the inlet system is disposed and the reaction chamber. The partition consists of at least two segments partially overlapping one another. The partition is substantially conical.

Abstract: In a Fuel Filter arrangement for an internal combustion engine comprising a prefilter and a main filter mounted to the engine by a filter holder, the filter holder has a recess receiving the prefilter, which forms a plug-in unit removably inserted in the recess and position-locked therein.

Abstract: A combination filter and evaporator unit for use in small engine applications includes a filter member that is screw threadedly engaged to the evaporator unit to facilitate replacement of filter media as needed. The design of the unit constrains incoming oil to flow first through the filter media and then to an evaporation chamber. A central hub and a bottom wall of the evaporation chamber are directly heated by a heating element, and the evaporation chamber is closed by an imperforate lid so that heat loss is inhibited.

Abstract: An equipment for treating sewage, comprises a horizontal plate with a water sinking hole dividing the equipment into two portions: an upper portion of biofilter and a lower portion of contact oxidation pond. Within such equipment, a two-stage sewage biochemical treatment is accomplished. The equipment of the present invention has the advantages of less land occupation, less energy consumption, higher pollutant removing rate, higher shock resistance, easy management, no excess sewage and waste gas being drained off and less secondary pollution.

Abstract: A filter assembly for fluids such as air and water employs a cleanable filter. The filter is located within a housing having a reservoir, and a steam generator which can be selectively operated to clean the filter.

Abstract: Provided below the funnel-shaped outlet opening of a receptacle filled with wet slag sand is an outlet funnel which is closed to begin with and forms a conical annular gap around the receptacle. This gap fills with slag sand, as a result of which dewatering occurs according to the principle of the siphon effect.

Abstract: A device and a related method are provided for reclaiming or recovering dry cleaning solvent from otherwise disposable fluid contained within a separator or other suitable receptacle of a dry cleaning machine. The device includes an evaporator and a fluid transfer mechanism for transporting fluid evaporated by the evaporator through a filter that removes substantially all of the solvent present within the evaporated fluid. Alternatively, a filter can be interposed between the separator or other suitable receptacle and the evaporator so that solvent is filtered before reaching the evaporator. Consequently, the device substantially reclaims or recovers dry cleaning solvent that may still be present within the fluid that is to be otherwise disposed of from the separator or other suitable receptacle.

Abstract: A point of use water purification system including a housing supporting an untreated water container, a removable and disposable filter means and a treated water receiving container all of which are self contained in relation to the housing to enable the housing to be supported from a countertop or other suitable surface at the point of use. The filter means includes multiple compartments with purification media therein with two of the compartments including plate means coated with a photoactivated catalyst, preferrably titanium oxide (TiO.sub.2). An ultraviolet lamp and reflector directs ultraviolet light energy onto the catalyst. Flow control means is provided in the filter means to provide a slow rate of flow thereby providing long time contact between the water being treated and the purification media in the filter means to provide maximum purification efficiency.

Abstract: A small-sized, low cost to manufacture and inexpensive wastewater treating biological film tank by which wastewater produced in each home can be treated by each home. A treating tank 10 has therein multi continuous-pore soft ceramic 40. Waste or raw water is supplied into the tank from its top through a waste/raw water supplying pipe 21, and pushed up by the action of air bubble forced into the tank from its bottom through an air bubble generator 30, and then flows over through cylindrical guide 50 into the multi continuous-pore soft ceramic 40 wherein the water is purified by microorganisms which digest the nutrient in the waste or raw water. Surface area of the multi continuous-pore ceramic element 40 is about 25 times larger than that of a conventional plastic element.

Abstract: A water conditioning or purifying apparatus for preparing drinking water from tap water, incorporating a water inlet at the bottom area and a water outlet at the cover area. The water conditioning or purifying apparatus is provided with activated carbon and anion exchange material for filtering contaminants, and the casing is divided into a lower and an upper casing portion, which both can be removed from each other. The interior of the casing incorporates a first, lower chamber containing the activated carbon and a second, upper chamber containing anion exchange material. Both chambers are sealed at the top and at the bottom by filter fleeces. The water to be purified flows uniformly through the entire cross section of the casing and with the same speed from bottom to top.

Abstract: A tri-modal filter canister adapted to contemporaneously remove both entrained water and suspended solid particles from non-aqueous fluids, said water and particulate removal functions being separate and substantially severable within said filter canister.

Abstract: A settling apparatus for the separation of amalgam from waste water in a dental procedure includes an inclined passage through which the water is caused to flow from below and upwards while depositing amalgam. The inclined passage has an inclination of between 3.degree. and 15.degree.. It is filled with a large number of thin-walled, narrow tubes, which contact each other in a side-by-side manner. The water flows from below and upwards through the tubes and through the channels between the tubes while amalgam is settled and deposited on the interior, as well as on the exterior, surfaces of the tubes.

Abstract: A device for removing free fatty acids from cooking oil is formed by a pair of superposed reservoirs having a screen and filter pad provided partition dividing the reservoirs from each other through which the cooking is forced from the upper reservoir to the lower reservoir by air pressure. A powder commingled with the oil prior to the filtering step is trapped with free fatty acids on the filter pad.

Abstract: An apparatus is disclosed for removing ash from repulped wastepaper which contains ash together with cellulosic fibers. The apparatus includes a frame and a plurality of rolls which are rotatably secured to the frame, such that the axes of rotation of the rolls are spaced and parallel to each other. The plurality of rolls include an upstream roll and a downstream roll having a cylindrical outer surface. A porous belt is supported by and extends around the plurality of rolls to define an endless loop. The belt moves between the upstream and downstream rolls for defining a screening portion. A headbox is disposed within the endless loop, and adjacent to the screening portion for ejecting the repulped wastepaper through the screening portion. A drainage device is disposed on the opposite side of the screening portion relative to the headbox for receiving ash passing through the screening portion.

Abstract: A system and method to remove pathogenic organisms and other suspended and dissolved containments from sewage or other contaminated water by an inexpensive, nearly maintenance free device. Principles of operation include new effective methods whioch combine synergistically, suspended and fixed film biological reactor, settling chamber, physical filter, and composting technology, to achieve tertiary sewage treatment and equivalent treatment of other contaminated water without outside energy input being required. Contaminated water flows into the apex or center of a large circular, wedge or conic chamber, then radially through precisely shaped layers of medium which provide progressive treatment by reduced pore size and increased surface area as the flow proceeds to the periphery. Oxygen can be diffused into the final treatment stage by providing large surface exposure to ambient air.

Abstract: A combined oxidation orbital ditch and intraclarifier has the intraclarifier in the form of an elongated clarifier vessel positioned on the top of a section of the center partition between the ditch sidewalls so that the overall clarifier vessel extends laterally into both of a pair of flow channels formed between the ditch sidewalls and the center partition but is spaced from the ditch sidewalls so as to minimize impediment of the mixed liquor flow being treated in the channels. A gated inlet below the flow surface is provided in the one half of the bow of the vessel facing into the mixed liquor flow for diverting a portion of the flow into the clarifier. That flow portion is distributed over the entire width of the vessel and arrested in flow velocity so that settling of sludge can be performed downstream in the vessel.

Abstract: The biological filter of the instant invention is intended for use between a septic tank and a drain field and includes a filter tank which receives effluent from a septic tank. The filter tank contains therein aerobic and anaerobic treatment means for treating, simultaneously, aerobically and anaerobically, portions of septic tank effluent. The filter is operable to significantly reduce the levels of all contaminants found in septic tank effluent prior to the releasing of effluent into a drain field.

Abstract: In the improved system and method of the present invention, a batch of contaminated oil is deposited into a tank, with the oil preferably being passed through a filter during the depositing step to assist in removal of solids. Once the contaminated coolant has been deposited into the tank, the oil is agitated by injecting several streams of air into the bottom of the tank. This creates several bubble streams which pass upwardly through the coolant toward the surface and, during this passage, agitate the coolant and effect separation of the oil so that it rapidly rises to the coolant surface. The bubble streams are created by different sized orifice member whereby the bubbles of one stream are smaller than the bubbles in another stream.

Abstract: A fish tank filter comprising an overflow tank for collecting surface waters from a fish tank, means for conveying the waters to a dry filter, a dry filter comprising a plurality of vertically stacked filter pans each having a filter material therein, a means for collecting the effluent from the dry filter and conveying it to a wet filter, a wet filter comprising a plurality of serially arranged filter material-containing filter compartments in a tank, and means for returning purified water to the fish tank.

Abstract: A liquid filtering and backwashing apparatus comprising a filter tank having a first outlet valve and a filter cell disposed within the filter tank is disclosed. The filter cell includes a conduit and an outer member with the outer member spaced apart relative the conduit with a filtering medium positioned between the conduit and the outer member. A plurality of openings in the outer member enable fluid communication between the liquid to be filtered in the filter tank and the filtering medium. The conduit is provided with a plurality of slits to enable fluid communication between the filtering medium and interior of the conduit while retaining the filtering medium external the conduit. A backwash holding tank in fluid communication with the conduit collects the filtered liquid. The backwash holding tank includes a second outlet valve for the filtered liquid to drain.

Abstract: An apparatus for removing foreign matter from a solution of paint or the like. The apparatus includes a vacuous vessel for receiving the paint solution which has been strained; a straining assembly which has a main body mounted in fluid communication with the vacuous vessel; and a plurality of removable filter elements positioned internally of the main body and operable selectively to remove foreign matter from the solution of paint which is passed therethrough.

Abstract: Process for recovering nitrate from surface and ground water, in particular drinking water, by means of biological denitrification, in which the nitrates contained in the water are reduced to gaseous nitrogen in a reactor by means of a biocatalyst having immobilized cells trapped in a gel or polymer. The "micrococcus denitrificans" that is preferably used requires for its metabolism added hydrogen and carbon that is present in the water in the form of dissolved carbon dioxide. Using a biocatalyst of immobilized cells and of the bacterial strain used, expensive after-purification is unnecessary because of increased bacterial count in the pure water outlet, and no undesirable by-products are formed.

Abstract: The reaction vessel is provided with a partition to separate a sub-chamber from the reaction chamber of the vessel. The sub-chamber also contains lamellar flowbacks for the separation of liquid and biomass. Clean liquid is collected in troughs at the top end inside of the flowbacks and is transported via a circular trough to a discharge spigot. Biomass is discharged via sludge pockets which open directly into the reaction chamber.

Abstract: An improved barrier oxidation ditch is provided which has a channel portion for unaerated induced-flow and an inclined duct for aerated induced flow, whereby energy in the dammed-up momentum is more efficiently released. This induced-flow duct is inclided at 30.degree. to 60.degree. to the horizontal, preferably 45.degree., and is disposed upstream of, downstream of, or alongside of the circulator/aerator in the intake channel. The induced-flow duct is preferably rectangular in cross-section and may have its downstream wall formed by the baffle if it is downstream of the circulator/aerator. The induced-flow duct is connected at its lower end to the discharge duct to initiate a combined-flow portion thereof. This combined-flow portion has an upper side which may be a thin wall or may be a much thicker aerator bridge. A baffle may be mounted downstream of the inlet of the induced flow duct for selectively restricting the amount of unaerated induced flow.

Abstract: This invention relates to high pressure liquid chromatography and to chromatographic columns employed therein. These columns may be modularly modified as to length and/or internal diameter and may contain other components in the modular system, for example, column sections, adapters and cone adapters, for joining column sections of different internal diameters, and end plate units for funnelling in or discharging out fluids; said end caps or lids, with or without funnel shaped means, for facilitating the liquid entrance or exit; and porous frits, with or without handles, all used in conjunction with the column sections to facilitate their usage for performance of specific chromatographic functions. The column sections have terminal flange-like means for accommodating the joining together for formations of a system suitable for high pressure liquid chromatography of the preparative or semi-preparative type.

Abstract: An over-the-counter, free-standing, water purification system including a pressure vessel that encloses a reverse-osmosis separator. Tap water at a pressure of between approximately 20 and 100 psig is introduced into the pressure vessel and a portion of the water is forced through the reverse-osmosis separator, while the remaining water is discharged from the pressure vessel along with the pollutants that are too large to penetrate the membrane of the reverse-osmosis separator. The product water passes through the reverse-osmosis separator at a rate of between approximately 5 to 100 milliliters per minute and is then post-filtered at a slow rate through a large amount of activated carbon, between approximately 10 and 1,000 grams, contained within the housing for the purification system.

Abstract: Oil polluted water or solid adsorbents are treated with microbially produced glycolipids to separate the oil phase. The treatment may be carried out in an apparatus which can be taken to the site and which comprises a mixing vessel supported by an undercarriage and provided with a storage container to supply the glycolipids, filling means, overflow discharge means and outlet means at its base.

Abstract: A system to remove contaminants from water includes, in the pressurized water flow lines, a venturi nozzle assembly to entrain air in the water, a pressure tank to store and deliver the air laden water, an aerator/precipitator tank assembly to remove the excess air and any residual gases from the water in the pressurized system and to remove contaminants from the water and a filter tank having a filtration bed therein to remove the remaining precipitated contaminants from the water and to deliver the water to service.

Abstract: An anaerobic fermentor comprising: a container vessel divided into at least two compartments each having a floor, a roof, and a layer of liquid-pervious packing material disposed horizontally across the compartment at a position intermediate the roof and the floor with its lower surface upwardly spaced from the floor and its upper surface downwardly spaced from the roof; liquid conduits connecting successive compartments in series and connecting the space between the roof and packing layer of one compartment to the space between the floor and packing layer of a succeeding compartment; means for introducing liquid to be treated to the first of the successive compartments; means for removing treated liquid from the last of the successive compartments; means for the removal of gas from the space between the packing layer and the roof of each compartment; and means for the removal of solids from the fermentor.

Abstract: An improved barrier oxidation ditch is provided which has an inclined duct for the induced flow, whereby energy in the dammed-up momentum is more efficiently released. This induced-flow duct is inclined at 30.degree. to 60.degree. to the horizontal, preferably 45.degree., and is disposed upstream of, downstream of, or alongside of the circular/aerator in the intake channel. The induced-flow duct is preferably rectangular in cross-section and may have its downstream wall formed by the barrier if it is downstream of the circulator/aerator. It is connected at its lower end to the discharge duct to initiate a combined-flow portion thereof. An in-channel clarifier, disposed in the discharge channel so that its upstream wall is the barrier and its solid bottom is the ceiling of the combined-flow portion of the discharge duct, provides prolonged bubble retention time at maximum hydraulic pressure, whereby the efficiency of oxygen transfer is increased.

Abstract: An industrial waste anaerobic digester is disclosed having separate sections therein, in which the acid forming and gas forming phases of the digestion process can occur separately under conditions optimized for each phase. A rotating biological contactor is provided in each section for increasing the liquid/gas interface to facilitate the anaerobic reaction. A series of partitions is provided in each section to create zones in which the waste concentration is extremely high and on which the biota can react at maximal reaction rates. The CO.sub.2 produced in the acid forming phase is used in both acid and gas forming sections to mix and achieve pH adjustment, and the methane can be used in the gas forming sections for mixing. A thermophilic chamber in the center of the tank is surrounded by the mesophyllic chamber to minimize and utilize conductive heat loss.

Abstract: A particle precipitator in the form of a cylindrical tank accepts raw water through a tangentially and horizontally mounted pipe. The precipitator is divided into three separate chambers, a lower, middle, and upper chamber separated by two baffles. The raw water enters and circulates into the lower chamber and because the lower chamber is of much larger volume than the inlet pipe, the velocity of the raw water is substantially reduced. During the raw water's residence time in the lower chamber, many of the larger particles are permitted to precipitate out to the bottom of the precipitator tank. The water then flows through a center opening of the lower baffle to the middle chamber and around the outer edges of the upper baffle to the upper chamber. By the time the water reaches the upper chamber, most of the larger particles have had a chance to precipitate out and the water in this upper chamber is substantially cleaner than it was when it entered the precipitator tank.

Abstract: A magnetic separator useful for treating chips in a machine tool is disclosed, which comprises a separating cylinder, a plurality of magnetic plates arranged at an outer periphery of the cylinder and spaced apart each other, an inlet for a fluid suspension at a middle part of the cylinder, outlets for a separated fluid at one end and for the suspended matter, such as machined chips, at the other end of the cylinder, and a screw conveyor inserted into the cylinder in such a way that the screw conveyor is contacted at its peripheral edge with an inner wall of the cylinder. The magnetic plates are arranged in a circle around the cylinder with the polarity of the adjacent magnetic plates arranged in a special sequence for generating a maximum magnetic flux toward the axial center of the cylinder. Also, the magnetic plates extend from the inlet near the middle of the cylinder to both outlets at opposite ends of the cylinder for achieving a strong magnetization of the chips suspended in the fluid.

Abstract: An easily transportable water purification device, comprising a closed tank in which a plate separator is arranged, and between the inlet for the water to be treated and the inlet connection of said tank a tube coalescer is included for obtaining coalescence of particles suspended in the water. Said coalescer is a tube wound around the tank, and in particular an elastic hose, providing impact protection of the tank. Inside said tank additional storage chambers can be provided laterally of the plate separator.

Abstract: Arrangement for the biological cleaning of water, said arrangement being suitable for large urban stations for cleaning sewage or for the cleaning of waste waters of industrial plants. The arrangement comprises an activating system with pneumatic aeration and a separating system communicating therewith, the arrangement operates on the basis of fluid filtration and automatic return of activated sludge into the activating system by gravitation. Suitable partition walls in a large container form a number of part activating spaces and part separating spaces; by suitable interconnections, by rectifying walls, by the supply of raw water, and by aeration a convenient streaming flow of the liquid and an advantageous operation of the arrangement are obtained.

Abstract: A mobile, self-contained, self-powered three stage apparatus is disclosed for separating solids from a liquid. Three stack separator pods are mounted over a housing on a mobile platform. A plurality of hydrocyclones are readily mounted with respect to the separator pods to provide for separating the solidds therewithin. Each successive separator pod contains a greater number of smaller diameter hydrocyclone so as to enable the separation of smaller diameter of particles. Each separator pod also includes degassing capabilities. A plurality of holding tanks act as reservoirs for the fluid and solid mixture prior to and subsequent to each separator pod. A system of internal weirs allows overflow of liquids from a holding tank containing cleaner mixture to a holding tank containing a greater proportion of solids, whereby liquid equilibrium is maintained within the system.

Abstract: The present disclosure is directed to a sewage treatment device of the marine type and operates on an extended aeration principle employing an aerator, clarifier and disinfector. The clarifier is disposed beneath the aerator and the top of the clarifier with a common wall therebetween which forms the bottom of the aerator. A first passage conducts fluid from the aerator to the clarifier and has a central port in the common wall. A second passage conducts fluid from the clarifier to the disinfector. The aerator has an influent inlet and the disinfector has an effluent outlet.The treator includes in the aerator vessel nozzle means for admitting air to the vessel in a direction to cause fluid in the vessel to move orbitally about a vertical axis with the nozzle means being disposed at a level proximate the common wall between the aerator and clarifier.

Abstract: The present disclosure is directed to a sewage treatment device of the marine type and operates on an extended aeration principle employing an aerator, clarifier and disinfector. The clarifier is disposed beneath the aerator and the top of the clarifier with a common wall therebetween which forms the bottom of the aerator. A first passage conducts fluid from the aerator to the clarifier and has a central port in the common wall. A second passage conducts fluid from the clarifier to the disinfector. The aerator has an influent inlet and the disinfector has an effluent outlet.The treator includes in the aerator vessel nozzle means for admitting air to the vessel in a direction to cause fluid in the vessel to move orbitally about a vertical axis with the nozzle means being disposed at a level proximate the common wall between the aerator and clarifier.

Abstract: A device for separating a mixture of, for example, oil and water consists of a number of elements treating the mixture in stages, said elements being arranged in overlying position in order to manufacture a compact device.

Abstract: Sludge thickening apparatus comprising a vertical tank including sludge inlet and outlet pipes, and a discharge pipe weir; a vertical hopper within the tank having walls which diverge outwardly from a hopper bottom toward a top opening wherein the weir has openings communicating with the hopper interior; a cover plate closing the top opening and having a raised central portion with an opening; and a baffle plate spaced from the bottom opening and having an opening therethrough. A vertical airlift member is supported by the bottom of the tank and extends through the baffle opening, the bottom opening and communicates with the cover opening. An assembly including an air shut-off valve selectively controls air to the airlift member whereby the shut-off valve is closed when the outlet pipe is opened.

Abstract: A continuous flow liquids-solids separator for removing particulate solids suspended in gas scrubbing liquids used in industrial stack gas scrubbing systems. The separator includes a solids separating tank having a pair of parallel perforated walls and an inlet aligned to direct an entrant flow of the liquid-solids suspension in a direction generally parallel with the perforated walls to promote separation of the suspension such that particulate solids are retained in the tank while the scrubbing liquids flow into a liquids reservoir. The tank is supported within the reservoir and is connected with a bleed discharge line which accomodates continuous evacuation of the retained solids from the tank concurrent with the discharge of scrubbing liquids through an outlet in the liquids reservoir.

Abstract: A waste treatment tank has a cylindrical enclosure defining a chamber. A cylindrical side wall of the enclosure and a cylindrical baffle are arranged concentrically with respect to one another. The side wall and baffle divide the chamber into first and second chamber portions. Means for generating a horizontal circulatory flow pattern in the first, radially outward chamber portion is mounted within that chamber portion and includes a submersible pump means. The pump means has an inlet, an outlet and connector means between the inlet and outlet. The second radially innermost chamber portion forms a clarification section, while the first chamber portion forms the aeration section of the waste treatment tank. Inlet means are provided between the first and second chamber portions. The baffle also permits the communication between first and second chamber portions along the bottom of the baffle. Means for supplying air to the aeration tank section is operatively attached to the connector means of the pump.

Abstract: A centrifugal separator for removing a dispersed solid from a liquid phase by the combined action of a cyclone and a centrifuge, the centrifuge being mounted co-axially on the cyclone.

Abstract: Apparatus for eliminating impurities by flotation of such impurities wherein a stream of air is injected into a flow of liquid in a flotation cell so as to form distributed air bubbles fixed on the impurities, which air bubbles rise to the surface for their discharge as foam.

Abstract: The present invention relates to a multi-stage, single vessel, purification system for removing solid particles from liquids.Within the central portion of the vessel is a deceleration chamber having flow control means. About and substantially coextensive with the deceleration chamber is a filtering chamber. Depending well into the filtering chamber are a plurality of septums preferably coated with filter aid. Below the deceleration and filtering chambers is a settling chamber, and beneath the vessel is an expulsion device.A contaminated liquid is fed into the deceleration chamber and decelerated. In this chamber the lighter solid particles rise to the top of the liquid where they are removed, while the heavier density particles settle downwardly. As the liquid moves downwardly from the deceleration chamber it essentially displaces liquid in the settling chamber upwardly into the filtering chamber. In so doing the change of direction of liquid movement also causes the heavier particles to settle downwardly.

Abstract: A system of waste treatment and disposal which receives and completely destroys waste solids biochemically and disposes of the effluent by total evaporation within a sealed dispersion reservoir surrounding a two stage tank assembly. Raw sewage is reduced in first and second stages of anaerobic digestion in upper and lower tank units of a double tank assembly. Liquid effluent is forced outwardly through discharge openings in the lower tank unit and upwardly through a rock bed in the dispersion reservoir under the pressure of a liquid column in the upper tank unit. The liquid effluent evaporates in the rock bed as a third stage of disposal, with the resulting vapors being filtered through a sand bed over the rock bed and dispersed to the atmosphere in a fourth and final stage.