Abstract: A weir assembly for use with a mixer-settler for liquid-liquid extraction includes in one embodiment an organic weir having an inlet opening below the free surface of the organic phase liquid and a vertically-adjustable front wall allowing adjustments in the position and/or height of the inlet opening. The organic weir can also feature an angled bottom coupled to a lip segment, an incline plate in the interior of the weir, and a front wall that is angled with respect to incoming fluid flow. In another embodiment the weir assembly can independently or additionally include an aqueous weir with a labyrinth section. The aqueous weir can optionally include an adjustable lip hingedly coupled to the top of the final partition in the labyrinth section.

Abstract: A storm water interceptor comprises an input conduit connected to a first treatment tank for delivering storm water to the first treatment tank and having an obvert elevation. Also, the interceptor comprises a lower conduit having an invert elevation, a substantially horizontal orifice at a first end connected to the first treatment tank and an exit orifice at an opposite end connected to a second treatment tank, whereby the substantially horizontal orifice at the first end of the lower conduit is below the invert elevation of the lower conduit. The interceptor further comprises an overflow conduit connecting the first treatment tank to the second treatment tank, whereby the overflow conduit is connected to the first treatment tank at a location above the obvert elevation of the input conduit.

Abstract: A water separation unit having an inner housing for storm water collection, separation of oils and debris from the storm water, and discharge of clean water. The inner housing is suspended inside an outer housing. The inner housing has a translatable floor with a plurality of hollow tubes extending upward from the floor and downward through the floor for passage of clean water from the inner housing and out the water separation unit. A plurality of conduits collect the clean water as it escapes from the inner housing and carries the clean water to a discharge tube and out the water separation unit.

Abstract: An apparatus and method for separating oil and particulate contaminants from pump-driven aqueous fluid contaminated with emulsified oils, free oils, particulate matter, suspended solids, and other contaminants in which the contaminated fluids are introduced into a container having a horizontal bottom portion and a weir plate dividing the container into an upper clean fluid compartment and a lower separation compartment, an aperture for the outflow of clean fluid from the upper clean fluid compartment sized relative to the pumping rate of the pump driving the aqueous fluid to ensure a residence time of the contaminated fluid in the lower separation compartment of at least about 0.4 minutes, coalescing media comprising a plurality of abutting polypropylene spheres located in the lower separation compartment, and a drain receptacle for collecting the contaminated fluid and delivering the contaminated fluid across the weir plate to the lower separation compartment.

Abstract: A filter system for receiving an aqueous-based fluid contaminated with particles and emulsified contaminant oil, removing the particles, and separating the emulsified contaminant oil from the aqueous-based fluid includes a filter media for receiving the aqueous-based fluid and emulsified contaminant oil, having an inner filter element formed from a 95 percent single pass efficiency 48 micron (5 micron nominal) filtering material of needle punch polypropylene felt, an outer filter element formed from a 95 percent single pass efficiency 19 micron absolute filtering material of a polypropylene microfiber material and a porous spunbond polypropylene sandwiching the outer filter media.

Abstract: A method is provided for introducing a fresh sludge flux whose concentration in terms of dry material is less than 40 g/l into the upstream part of digester, maintaining a thin sludge layer in the digester, circulating substantially horizontally effluents above and across the sludge layer and removing the effluents from the digester simultaneously with soluble products of sludge digestion. The cuvette of the digester is divided into sections by transverse walls, which are provided with communication openings in the lower part thereof.

Abstract: A screen apparatus for improved separation of particulates from a fluid stream. The screen is configured and arranged to filter relatively large particulates from the fluid stream as the fluid stream passes from a storage chamber of the tank to a tank outlet. The screen is removably affixed to a diverter, such as a baffle, used to divert a portion or all of the fluid into the storage chamber. The screen is preferably shaped to substantially conform to the shape of the diverter to aid in the smoothing of the fluid flow within the retention section of the tank. The screen may be entirely porous, or it may be non-porous at its leading edge to minimize particulate build-up at the transition from the tank interior wall to the screen. The apparatus may optionally include a second screen to provide additional filtering of floating particulates as the fluid level in the tank exceeds the crown elevation of the inlet.

Abstract: A storm water filter system for filtering storm water being fed into an in-ground well includes a housing having an inlet and an outlet, with the outlet being connected to an in-ground recharge well. A plurality of open chambers are formed in the housing. An inlet filter box has an open end located in the housing and positioned with the open end facing the housing inlet. An outlet screen filter is positioned over the outlet for capturing debris from water entering the outlet and has a bypass for water to pass when the filter becomes partially blocked.

Abstract: A concrete pump washout system which is mountable to transport vehicle(s); the system provides for the quick safe, and easy removal of all waste water and concrete used in the washout of concrete pumps and concrete truck chutes on a construction site. When applied to concrete pump washout, washout water and waste concrete are deposited into a tub, and a fluid vacuum pump is used to separate the water into a holding tank for later disposal. The waste concrete is left behind to harden in the tub, which may be disposable, for later removal to a disposal site, thereby freeing the concrete pump for the next job. When applied to concrete truck chute washout, water is removed from washout of the chute into the concrete pump hopper and pumped back into the truck hopper or into the washwater holding tank for later disposal, at which point the truck may leave and the pump is ready for the next load.

Abstract: A method for cleaning the fountain solution of a printing press with an automatically emptying separator (16), separates the dirt particles and oil residues from fountain solution and supplies them, as a mixture of dirt and fountain solution, to a dirt and fountain solution container (24) and passes the remaining fountain solution into a fountain solution storage tank (20). The dirt and fountain solution mixture in the dirt and fountain solution mixture container (24) is caused to settle in layers and the layer, containing the fountain solution, is transferred by an overflow (26) in to the fountain solution storage tank (20).

Abstract: The invention provides a runoff water purification system for removing pollutants which accumulate on road surfaces, thereby reducing the workload of the sewage water treatment plants and preventing environmental water pollution. The system 1 is installed under the ground of the side of the road 2. Runoff water runs into the system 1 through a curb inlet 120, is purified and discharged to a sewage pipe 56. The system is made up of a concrete box 11, in which a wall 10 separates the box into a maintenance tank 7 and a treatment tank 9, both of which are connected to each other at their lowest ends. Runoff water flows into the maintenance tank 7 and to the treatment tank 9, through the connecting conduit where pollutants are removed, and discharged to the sewage pipe.

Abstract: A storm water collection system including a below ground basin and a grate covering the basin. The system also includes a removable water impermeable receptacle disposed within the basin and an inner housing for directing ground water passing through the grate and to the bottom of the removable receptacle. The receptacle also includes one or more generally rectangular openings in an upper portion thereof so that water that flows through the inner housing and upwardly between the walls of the inner housing and the walls of the receptacle flow out of the openings and down to the bottom of the basin.

Abstract: A fuel-water separator for diesel engines has a coalescing media and baffle plates through which diesel fuel and water pass upwardly, separation thereof being effected by reducing emulsification of water with fuel, and by passing of heavy particulates to the bottom of the separator.

Abstract: A retention treatment basin system and method 10 that handles an influent of combined wastewater and sewer overflows. The influent includes floatable 12 and settlable solids 14. The basin includes a ceiling 16. The retention treatment basin has one or more influent channels 20 that duct the influent into the basin. A weir assembly 22 extends upwardly from the floor, over which the influent flows. A cell 24 receives the influent passing over the weir. At least some of the settlable solids are retained in the cell. A baffle 26 traps at least some of the floatable solids in the cell. Part of the influent passes under the baffle. One or more up-flow screen systems 28 with bars having a triangular cross-section extend from the baffle that are pervious to fluids for receiving the influent and arresting movement of floatable solids therethrough. The screen system creates a floatable-solids depleted effluent.

Abstract: Solids removal assemblies (14) adapted for use in flow-through or batch-type sedimentation tanks (12) are provided which increase the efficiency of solids removal and eliminate physical scraping devices common with such sedimentation tanks. The preferred removal assemblies (14) include an elongated hood (34) disposed over a cooperating and complementally configured fill structure (26,28), which fills the majority of the internal volume of the hood (34). The hood (34) includes converging sidewalls (44, 46) having lower most inlet openings (54) and spaced, tubular outlets (56) adjacent the apex thereof. Outlet pipes (64) are operably coupled with each of the hood outlets (56) for suction withdrawal of waste water-solids suspensions which are then conveyed for downstream processing.

Abstract: A process for treating sulphide-containing water includes maintaining a steep redox potential gradient in an interface zone of the sulphide-containing water. The water is exposed to an oxygen-containing environment, and the interface zone is located immediately below the surface of the water. Sulphide in the water is biologically oxidized, in the interface zone, to sulphur. The sulphur may be removed by settling, thereby achieving a final removal of sulphur compounds.

Abstract: Methods and apparatus for treating wastewater are described, one method embodiment including the steps of flowing a mixed liquor suspended solids to a high rate clarification stage, forming a clarifier effluent, a first waste activated sludge stream, and a return waste activated sludge stream. The high rate clarifier effluent stream then flows to a membrane stage that includes a membrane media, producing a membrane reject (retentate) stream and a treated effluent (permeate) stream. Optionally, the methods include routing a screened raw wastewater to an anaerobic and/or aerated anoxic stage and introducing a gas comprising oxygen to the wastewater during the aerated anoxic stage, and optionally allowing the product of this stage to flow to an aeration stage prior to the high rate clarification stage.

Abstract: A wastewater treatment method and apparatus including a denitrification (anoxic) chamber for denitrifying wastewater, an aeration basin with Bio-Wheel for aerating the wastewater, and a membrane device in which sludge particles are separated out of the wastewater, leaving clean discharge water and reusable sludge. Sludge from the membrane chamber floor is sent back to the aeration basin or denitrification chamber or both. Excess sludge is wasted or held for further processing. Preferably, the method and apparatus facilitate both activated sludge and fixed film processes.

Abstract: A waste water treatment system and process for treating waste water received in a batch tank. The waste water is discharged in a headwork screen for removing large solids in the water. The solids are into a sludge drying bin. The screened water is transferred into a top of an influent surge tank with an oil/water separator. The oil/water separator includes a plurality of coalescing plates for separating free oil from the waste water. Heavy solids in the surge tank are drained into the sludge drying bin. The waste water is now dropped into a containment pan. From the containment pan, the waste water is pumped into a water treatment tank. The water treatment tank includes two or more electrodes mounted in the top thereof. The electrodes are separated using insulating support spacers for providing proper electrode spacing and insulation between the electrodes. The electrodes are used for providing current to the waste water and separating the contaminates in the water by electrocoagulation.

Abstract: This invention provides a device for removing particulates from a liquid. The invention comprises a first chamber having an outlet and an inlet, operably configured to receive into the first chamber a liquid stream having particulates suspended therein. The device further includes a second chamber having an inlet, a top, a bottom, a processed liquid outlet and a sealable settlement outlet, the inlet being in fluid communication with the outlet of the first chamber and being disposed within the second chamber closer to the bottom of the second chamber than the top; and, a third chamber being in fluid communication with the processed water of the second chamber and having an exit line operably configured to deliver processed water. The first chamber further includes a floor and the inlet of the first chamber is operably configured to direct the liquid stream is a direction substantially parallel to the floor.

Abstract: A separator device including a vessel for separating water from oil. The separator device is provided with a measurer for measuring the temperature of the wall of the vessel.

Abstract: A hydrodynamic device for removing sediment and other materials from storm water runoff is provided. An exemplary embodiment of this device includes: a first substantially cylindrical chamber a second substantially cylindrical chamber concentrically disposed within the upper portion of the first chamber, a first baffle concentrically disposed within the second chamber, and a second baffle disposed within the lower portion of the first chamber. A water inlet is attached to or formed integrally with the second chamber; a water outlet is attached to or formed integrally with the first chamber; and an optional bypass outlet is attached to or formed integrally with the first chamber.

Abstract: The present invention provides a method and apparatus for the recovery of salt from a glycerine process, allowing the salt to be used in a brine solution. A salt settling tank is positioned inline between the foots from a crude still bottom and a foot still. Salt settles to the bottom of the settling tank and into a salt receiver positioned below, while clarified liquid overflows to the foot still. Salt from the salt receiver is then semi-continuously transferred into a salt extractor where the salt is removed from the mother liquor. A condensate is then circulated into the salt extractor and the salt slurry is then stored in a brine storage tank.

Abstract: An automatic tank cleaning system includes a water recycling unit having a weir therein and a conically-shaped bottom, a cutting box having a portable weir therein, a hydrocyclonic separator, and a mud tank. Tank slop is pumped from the mud tank to the water recycling unit where solids collect at the bottom. The solids are removed and collected in the cutting box. Water in the recycling unit may be pumped through the hydrocyclonic separator. Solids removed by the separator are collected in the cutting box and the water is directed into a clean water compartment defined by the weir within the recycling unit. Water in the cutting box is collected by the portable weir therein and pumped to the clean water compartment. Water from the clean water compartment is pumped to one or more rotary jet heads within the mud tank. Overflow from the water recycling unit may be directed to the cutting box. A chemical inductor may be used to add cleaning chemicals to the water prior to being directed through the wash nozzle.

Abstract: The present invention provides a new and improved method and apparatus for separating a disperse mixture of two non-miscible liquids to increase the separation extent within less time required as per usual. The proposed method includes the steps of providing a tank having an elongated horizontal extension terminated by two end faces (4, 5), creating within said tank an interface (13) between a first layer formed by a volume of one of said two liquids and a second layer formed by a volume of the other of said two liquids with, and supplying said disperse mixture into the tank from one of said end faces (4) thereof directly into said interface (13).

Abstract: The present invention is an apparatus and process for oxidizing mercaptans in a preferably kerosene stream. By using a catalyst promoter, sufficient separation of hydrocarbon and aqueous alkali occurs in the reactor vessel to obviate the need for a settling tank. Hence, the sweetened kerosene can be withdrawn from the reactor vessel and sent directly to a residual alkali removal unit such as a sand filter vessel or to a water wash vessel if jet grade fuel is desired. In an embodiment, the reactor vessel used for this purpose includes a reaction section and a separation section in the same reactor vessel and an aqueous alkali outlet and a sweetened hydrocarbon outlet in the separation section.

Abstract: A system for settling solids or other impurities from water or wastewater. The system includes a containment vessel for containing fluid. The containment vessel has an inlet for receiving an influent and an outlet through which an effluent is discharged. At least a first group of tube settlers is disposed in the containment vessel. The first group of tube settlers has a top, a bottom and a plurality of tubes for receiving influent and discharging effluent. A distribution channel is provided for distributing influent evenly through the first group of tube settlers to enhance the settling of solids and other impurities from water or wastewater.

Abstract: A container for receiving and holding effluent water containing oil/grease to be removed has sectional covers. A main sectional cover supports a partially immersed rotatable disk; a drive on the main sectional cover rotates the disk; a trough on the main sectional cover straddles the disk; and a blade on the trough scrapes a side of the disk, to direct oil and grease from the disk along the scraper blade along the trough for collection in a storage container. Efficiencies of construction of the sectional covers, disk and a sensor probe are disclosed.

Abstract: The invention concerns a lamellar clarifier (1) comprising: a) a tank (3) for liquid to be clarified (5), b) means for conveying said liquid (5) into a lower zone (9) of said tank (3), c) means (11) for evacuating said liquid (5) from an upper zone (13) of the tank (3), and d) a plurality of settling plates (Di) arranged inside said tank (3), said plates (Di) being substantially parallel and uniformly spaced apart from one another so as to define a plurality of passages (IIi) extending between said lower (9) and upper (13) zones. Said clarifier is characterized in that it further comprises tubular members (Ti) integral with said plates (Di), and oscillating fixing means (?i) interposed between said tubular members (Ti) and said tank (3).

Abstract: The anoxic biological reduction system and method for treating wastewater may be an anoxic biological reduction element disposed in a membrane anaerobic stabilization system. The wastewater may be treated to produce an effluent suitable for membrane filtration with the treating incorporating processes substantially free of aerobic biological treatment. The effluent may be filtered through a membrane element selected from the group consisting of a microfiltration system and an ultrafiltration system or a combination thereof. The membrane effluent may then be treated in an anoxic biological reduction element to produce a process effluent stream.

Abstract: An aeration vessel for use in a aerobic wastewater treatment system, the aeration vessel comprised of a bottom section having a bottom wall and an inverted frustoconical side wall, a top section having a frustoconical side wall and a partition having an inverted frustoconical side wall, the top and bottom sections being provided with mating flanges which can be sealingly engaged, the partition being disposed in the aeration vessel formed by the first and second section.

Abstract: The invention relates to a device to be used in connection with thickening and clarifying apparatuses for shear-thinning of solids containing material, such as slurry, which device contains one conduit for feeding material to be shear-thinnned and another conduit for discharging back the shear-thinned material between a thickening apparatus and the shear-thinning apparatus. The conduit (3,23) for feeding material to be shear-thinned and another conduit (4,24) for discharging back the shear-thinned material are positioned essentially concentrically to each other at least in the ends connected to the thickening apparatus (2,22).

Abstract: The invention relates to a method and apparatus for filtering or purifying water.

Abstract: Provided is an apparatus and method for performing tertiary treatment of sewage based on porous filtering media. The apparatus for performing tertiary treatment of sewage based on porous filtering media includes a reaction tank for receiving effluent wastewater from a primary settling tank; and porous filtering media, which is located in the reaction tank and has a predetermined size of surface area and opening, for settling suspension in the effluent wastewater and removing organic matter and nutritive salts included in the suspension.

Abstract: The invention relates to a method and apparatus for recycling a wash solution used in powder coating which uses filters. The invention also relates to methods and apparatuses for recycling wash solutions used in spray washing, steam cleaning or car washes using filters.

Abstract: A system to collect by vacuum conveyance, separate, and discharge two mixed immiscible liquids with different specific gravities comprising a prefilter vessel 200, a vacuum tank 100, an optional heavy phase intermediate separation stage 40, and an optional light phase intermediate separation stage 30. Vacuum tank 100 is under a constant regulated vacuum, which sucks mixed immiscible liquids with different specific gravities from their respective remote source(s) through conduit(s) connected to vacuum tank 100. Collection conduits can have manually, mechanically, or electro-mechanically controlled valves at their source ends. Any grit, sediment, particles, and/or floatable debris in the collection conduits is first removed, and then any entrained air in the mixed liquid stream is removed, from the mixed liquid stream prior to undergoing any phase separation stages. Initial phase separation occurs automatically in vacuum tank 100 without any phase interface detection devices.

Abstract: A system meets material collection needs by significantly increasing the flow rate through a header that collects sludge. Telescopic pipes stay in a line adjacent to the bottom of a basin and do not float upwardly into or against equipment in the basin. A bearing is configured in a radial space between the pipes and with a central axial sludge collection opening, and adjacent to the header. The sludge collection opening allows sludge flow into the pipes, the flow having a value not less than a minimum flow. This flow is into system from immediately around the pipes configured in the telescopic relationship.

Abstract: The invention concerns a lamellar clarifier (1) comprising: a) a tank (3) of liquid to be clarified (5); b) means (7) for conveying said liquid (5) into a lower zone (9) of said tank (3); c) means (11) for evacuating said liquid (5) from an upper zone (13) of said tank (3); d) a plurality of clarifying plates (Di) mounted inside said tank (3), defining a plurality of passages extending between said lower (9) and upper (13) zones; and e) means for calibrating said liquid flow (5) between said passages and said upper zone (13). Said calibrating means comprise first tubular members (Ti) mounted inside said tank (3) and integral with said plates (Di), and second tubular members (Tj) arranged substantially staggered relative to said first tubular members (Ti).

Abstract: An electrostatic separator intended for separation of liquid phase systems, made up of mixtures of liquids of various electrical permittivity. In particular, the separator is intended for separation of an oil-and-water emulsion. The electrostatic separator contains a vessel, inside which there is suspended a system of electrodes energized from an external voltage source. The electrode system comprises at least one pair of conducting plates (8), which is attached to a supporting frame (7) and electrically connected with the high voltage winding of a feeding transformer (9), which is placed in the supporting frame (7). The supporting frame (7) is preferably a casting of an insulating material. The conducting plates (8) of the electrode system are preferably connected to the winding of the feeding transformer (9) through a capacitive electrical connection.

Abstract: A system meets needs in sludge collection by significantly increasing the flow rate through a header that collects sludge without causing problems in priming. Telescopic pipes stay in a line adjacent to the bottom of a basin and do not float upwardly into or against equipment in the basin. The entire sludge collecting system is in a space of a low-clearance height under the equipment that extends downwardly near the bottom of the basin. The sludge is collected by openings in header pipes, and by at least one bearing opening in an outer pipe, wherein the bearing opening extends to a radial clearance between the telescopic pipes. Flow of the sludge through the radial clearance from the bearing opening is allowed by a bearing that permits relative movement of the outer pipe and the inner pipe to allow traversing of the outer pipe.

Abstract: The present invention is concerned with a method and apparatus for recycling drilling fluids used in the drilling of wells. The apparatus comprises a tank with a plurality of compartments. Used drilling fluid containing well cuttings or “solids” is pumped into a receiving compartment of the tank and directed towards a flow-reversing barrier. Reversal of the flow causes heavier solids to settle to the bottom of the tank. As fluid fills the receiving compartment, it flows downstream into an adjacent compartment by passing through a flow-restricting baffle that causes more solids to settle to the bottom of the tank. As fluid overflows from compartment to compartment in the tank, it passes through successive flow-restricting baffles causing further solids to settle to the bottom of the tank. When the fluid reaches the collecting compartment of the tank, it is removed to be used again in drilling operations.

Abstract: An oil/grease separator separates a lighter liquid from a mixture of the heavier liquid and a lighter liquid. A housing has an inner volume, an inlet to receive influent flow, an outlet to discharge the heavier liquid, which defines a static liquid level, and an outlet port above the static liquid level to discharge substantially all of the lighter liquid and portions of the heavier liquid. The lighter liquid floats on the heavier liquid, so that large volume flows into the inlet raises the liquid level in the housing, flowing the floating lighter liquid through the outlet port.

Abstract: A hindered-settling fluid classifier is adapted for processing aggregate entrained in a flowing slurry. The classifier includes a classifier tank defined by walls, and having an inlet at its upstream end and an outlet at its downstream end. A slurry feed pipe is connected to the tank inlet for introducing the aggregate slurry into the classifier tank for processing. A plurality of laterally-extending flow control doors are spaced apart along a length of the classifier tank, and are adapted for interrupting flow of the aggregate slurry downstream from the tank inlet to the tank outlet. The doors define respective material settling zones each located a progressively greater distance downstream from the tank inlet. At least one water line is provided for generating an upwardly rising current in each of the material settling zones to control the settling velocity of aggregate floating downwardly towards a base of the classifier tank.

Abstract: A method and a settling tank for use in separating a solids containing fluid, such as a drilling fluid. The settling tank includes a settling compartment comprised of an inlet and an upper outlet so that the fluid passes through the settling compartment generally in a first direction from the inlet toward the upper outlet. Further, a backwash fluid source directs a backwash fluid within the settling compartment generally in a second direction which is substantially opposite to the first direction. The method includes the steps of passing the fluid through the settling compartment generally in the first direction and directing the backwash fluid within the settling compartment generally in the second direction. Finally, a method is also provided for clarfying a solids containing fluid using a settling tank, wherein the settling tank is comprised of at least three isolatable settling compartments connected in series.

Abstract: A treatment vessel for separating contaminants from a base liquid is provided. The vessel comprises a first cylindrical portion, a frusto-conical portion, a second cylindrical portion and a conical portion, the conical portion having a bottom outlet arranged to discharge heavy contaminants from the vessel. Over time, the heavy contaminants settle on the sides of the conical and frusto-conical portions. In order to remove the settled contaminants, the vessel is provided with at least one clarified liquid inlet disposed at or proximate to the frusto-conical portion. The clarified liquid is sourced from either the treatment vessel itself, or another treatment vessel in the same system. The clarified liquid is reintroduced into the vessel in a manner so as to cause a downward circular flow to scour out the frusto-conical portion and the conical portion so as to assist in removal of heavy contaminants that settle on the sides thereof.

Abstract: An energy efficient and compact oil and water separator through which the oil and water flow for the purpose of extracting water from the oil and oil from the water made more efficient and compact by incorporating a precise control of the hydrodynamics through the application of permeable barriers on which the permeability is adjustable to compensate for variations in flow rate, density and viscosity of the oil and water, a downward flow of the oil through an electric field to mitigate the problem of high water content causing an electrical short circuiting of the electric field and a heating means with enhanced heat exchange capability.

Abstract: A method meets needs in material collection by significantly increasing the flow rate through headers that collect sludge without causing problems in priming. Telescopic pipes stay in a line adjacent to the bottom of a basin and do not float upwardly into or against equipment in the basin. An inlet end of an inner one of the pipes receives the collected sludge from spaced headers mounted on an outer one of the pipes. An operation is performed to balance a respective separate flow of the sludge from each of two headers mounted in spaced relation on the outer pipe. The balanced separate flows are substantially equal and flow into the inlet end.

Abstract: A storm drain system (10) contained in the ground (36) contains a standpipe (12) having a bottom section (18) having perforations (20) where a porous pavement (22) surrounds the top portion of the standpipe (12), where, beneath the porous pavement is a substructure of coarse aggregate, all surrounded by a non-porous base material (34), such as concrete, where a storm drain (28) connects to the standpipe by a top outlet pipe (30), where water (38, 40) and liquid impurities (42) are separated from storm water runoff by a non-perforated section of the standpipe.

Abstract: An overflow chamber (2) is provided for use in a combined sewer overflow. An inlet (12) and an outlet (14) open into the chamber (2) below a screen (20), and an overflow outlet (15) opens into the chamber above the screen. Baffles (26) are provided underneath the screen (20) across the general flow of storm water. In storm conditions, the storm water in the chamber (2) will reach the level of the screen (20), which traps aesthetically offensive material and gross solids, leaving the water to flow through the screen (20) to the overflow outlet (15). The baffles (26) circulate the storm water, and this dislodges material accumulated on the underside of the screen (20) and so helps to prevent blinding of the screen (20) in storm conditions.

Abstract: A method for cleaning a water area including dredging, via a dredging apparatus, waste from the water area through a suction pipe into a sedimentation basin, generating a flow of the dredged waste from the water area to the sedimentation basin via siphonage and variations in heights of the suction pipe relative to a bottom of the water area, and converting energy caused by the flow of the dredged waste in the suction pipe into energy for driving the dredging apparatus.