Abstract: The present invention may include a separation tank with an outer chamber and an inner chamber positioned within the outer chamber. An inlet and an outlet may be in communication with the outer chamber. A first opening may provide access between the inner chamber and the outer chamber. An inlet channel may extend between the inlet to a second opening in the inner chamber. A plurality of lower baffles positioned between the outer chamber and the inner chamber and adjacent to the first opening may be included. A plurality of upper baffles positioned between the outer chamber and the inner chamber and adjacent to the outlet may be included. Floating and non-floating particulate matter may be trapped in the separation tank as storm water flows through the apparatus.

Abstract: A prefabricated biological purification system for treatment of residential wastewater having a primary purification unit and a secondary purification unit containing a filling material having a grain size distribution of about 2 cm to about 4 cm in diameter. The primary purification unit having modular element forming a container, and internal elements including an inflow tube, an internal separation panel with a fluid passage duct defining a first internal sector and a second internal sector, a trapezoidal diaphragm, and a device for controlling liquid outflow. A second diaphragm in a form of an octagonal modular element is positioned within the container and a horizontal fluid passage duct is formed as a horizontal opening between portion of the internal separation panel and the second diaphragm. A flow control element forms an intake space between a bottom end portion of an outlet pipe and the trapezoidal diaphragm.

Abstract: A media used in conjunction with any system than is comprised at least of a septic or anoxic tank followed by an aerobic or alternating aerobic/anoxic treatment unit that is providing nitrification. The media enhances denitrification of effluent that has been recycled from the nitrification unit to the anoxic tank. The is comprised of a number of synthetic cords with a specific gravity less than the specific gravity of the effluent. The cords are attached to the bottom of the septic or anoxic tank. The cords will float in the liquid flow stream of the septic/anoxic tank providing a number of surfaces for fixed film organisms.

Abstract: A wastewater treatment system includes a septic tank having a discharge in flow communication with one or more biofilter containers having filter media therein. Wastewater or effluent from the septic tank is allowed to trickle downwardly through the filter media and each container includes an outlet for discharging the wastewater to the environment or transferred to other treatment facilities.

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

Abstract: A method of and an apparatus for rejuvenating a wastewater treatment system of the type including a septic tank, an aerobic treatment unit or the like connected by a pipe to a plugged downstream soil absorption system includes a wastewater treatment unit which is interposed between the septic unit/aerobic treatment unit and the downstream soil absorption system. The wastewater treatment unit includes a single piece or a multiple piece solids settling and retention basin within which is suspendingly supported a wastewater treatment mechanism essentially of the type disclosed in U.S. Pat. No. 5,264,120. The wastewater treatment mechanism includes filters for filtering and settling solids from wastewater and flow equalization ports for effecting flow equalization thereby eliminating flow surges to the downstream plugged soil absorption system.

Abstract: Disclosed is a septic heater system and method for preventing a freeze-up in a septic system. The heater system typically is used with a previously-installed septic system that includes a septic tank, drop boxes, connecting sewer pipe, a drainfield, and one or more vertical access/cleanout pipes which rise from one or more portions of the septic system to corresponding access ports at ground level. The heater system, which is adapted for connection to the access ports of one or more of the vertical access cleanout pipes, comprises a heater and fan system defining an output port for providing a flow of heated air at the heater output port. The heater output port is defined by a structure configured for coupling the output port to one or more of the access/cleanout pipes. The heater and fan system, when activated to provide the flow of heated air and when coupled to an access/cleanout pipe, prevents septic-system freeze-up by delivering the heated air down the access/cleanout pipe to the septic system.

Abstract: A storm drain filter system apparatus includes a skimmer tray having a sediment collection closed bottom and having an inlet side and an outlet side and a hydrocarbon absorbing boom. A plurality of boom support brackets each has a boom holding portion for holding the boom therein and a spacing arm extending from the boom holding portion and attached to one side of the skimmer tray to space the boom in the boom holding portion between the inlet side and the outlet side of the skimmer tray. The skimmer tray extends all or partly around the storm drain opening forming an open center area to allow overflow liquid to flow over the outlet side through the middle area. Sediment is collected in the bottom of the skimmer tray and the boom is supported spaced between the inlet and outlet side of the skimmer tray to capture hydrocarbons and liquid entering the skimmer tray. The liquid enters the skimmer tray on one side of the boom and out the other side of the boom.

Abstract: A small and cost effective sewage treatment system intended for unattended use in individual homes, small industries or businesses in locations where a central sewage treatment plant is not available. The sewage treatment system comprises a conventional septic tank which drains into a smaller aerated holding tank, a pump to transfer effluent from the holding tank into a disinfecting chamber, a regenerative heat exchanger used to raise the temperature of the effluent while being aerated in the holding tank, means for pumping the effluent at a controlled rate through a microwave field, and a conventional drain field used to release the disinfected water into the surrounding soil. Operation of this system is fully regulated by a micro-controller, thereby eliminating the need for human intervention during normal use.

Abstract: A method of and an apparatus for rejuvenating a wastewater treatment system of the type including a septic tank, an aerobic treatment unit or the like connected by a pipe to a plugged downstream soil absorption system includes a wastewater treatment unit which is interposed between the septic unit/aerobic treatment unit and the downstream soil absorption system. The wastewater treatment unit includes a single piece or a multiple piece solids settling and retention basin within which is suspendingly supported a wastewater treatment mechanism essentially of the type disclosed in U.S. Pat. No. 5,264,120. The wastewater treatment mechanism includes filters for filtering and settling solids from wastewater and flow equalization ports for effecting flow equalization thereby eliminating flow surges to the downstream plugged soil absorption system.

Abstract: The septic tank of the subject invention can be provided in kit form, and preferably comprises a tank lid, a tank bottom, a pair of opposing side walls, and a pair of opposing end walls having a tank flow outlet and a tank flow inlet, where a flange is affixed within the tank flow outlet and the tank flow inlet. The tank lid comprises a pair of lid openings, which are covered by hatch covers. The hatch covers comprise a hatch handle for ease of removal and are removable affixed to the tank lid with angle connection brackets. The septic tank is assembled using angle connection brackets, where the brackets are affixed to the tank lid, tank bottom, side walls, and end walls using, for example, stainless steel cap screws. A silicone sealant is interposed between the tank lid, tank bottom, side walls, end walls and the connection brackets, forming a substantially leak proof seal.

Abstract: A filter and housing (10) for waste water treatment includes a housing (10) having a plurality of coaxially mounted vertically extending sections adaptable to receive a filter cartridge therein. An upper section (12) is provided with an outlet consisting of at least two coaxially aligned rings (22) of preselected diameters wherein the thickness of the rings and the spacing between the rings is sufficient to receive waste water treatment outlets of different diameters. The filter cartridge is comprised of a stacked arrangement of a plurality of disc-dam units (32) wherein each disc-dam unit (32) is provided with a serpentine configured first dam (46), the first dam extending upwardly from an upper surface of the disc-dam unit, the first dam having terminating ends spaced at outer terminating edges (34a, 34b) of the disc dam unit to define a cord segment therebetween. The terminating ends are connected by a second dam (46) having a height less than the first dam.

Abstract: A self contained filter for a recirculating tank is used in a septic system. The self contained filter is a mattress-like filter made of woven material encapsulating aggregate material therein. The weave of the mattress-like woven material is smaller than the aggregate material. In another aspect, at least one mattress-like filter is placed within a tank.

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

Abstract: A dispersal field for a wastewater treatment system of the type used in conjunction with a septic tank, the dispersal field including multiple conduits, each conduit having at least one discharge opening. The configuration of each conduit and the size and position of the discharge openings causes wastewater flowing into the conduits to stand in each of the conduits below the level of the discharge openings until it has a BOD of less than about 125 mg/l.

Abstract: A radial flow septic tank includes: a main body having a wall and a floor defining a cavity; an inlet disposed at approximately a center of the cavity; an outlet having a collection device disposed around an inside perimeter of the wall of the main body; and a column disposed within the cavity at approximately the center of the main body, the column having openings to allow the flow to move from the inlet to the outlet.

Abstract: A method and system for the recuperation of the content of septic tank where the supernatant is returned to the septic tank after the recuperation of the sludge and of the scum is described herein. According to the method of the present invention, a major portion of the supernatant is advantageously recuperated from the top of the septic tank to the bottom thereof, and stored in a first reservoir of the system. The sludge, the remainder of the supernatant and the scum are then recuperated and stored in a second reservoir. The supernatant is filtered, either upon its recuperation or before its return to the septic tank. Finally, the filtered supernatant is returned to the septic tank.

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

Abstract: A flow leveling device for use in a liquid distribution system that can be attached to the end of a conduit The device has an eccentrically placed opening on the face of the device whose vertical position can be varied so as to equalize the flow of liquid dispersed from a central point. The device is secured to the conduit by a double-walled skirt depending from the face of the device. The skirt has a central gap defined by the double walls which securely holds the conduit walls therein.

Abstract: A system for limiting the size of particulate matter entering a septic tank pump contains a strainer that has a straining screen through which the pump draws liquid from the septic tank. A nozzle receives some of the effluent being pumped by the pump and is aimed toward the screen for directing effluent toward the screen to dislodge particulate matter from an area of the screen while the pump draws liquid through the screen. The screen and nozzle are arranged for relative movement so that the area of the screen being acted on by the effluent from the nozzle changes as the pump operates. Various embodiments are disclosed.

Abstract: A method of and an apparatus for rejuvenating a wastewater treatment system of the type including a septic tank, an aerobic treatment unit or the like connected by a pipe to a plugged downstream soil absorption system includes a wastewater treatment unit which is interposed between the septic unit/aerobic treatment unit and the downstream soil absorption system. The wastewater treatment unit includes a single piece or a multiple piece solids settling and retention basin within which is suspendingly supported a wastewater treatment mechanism essentially of the type disclosed in U.S. Pat. No. 5,264,120. The wastewater treatment mechanism includes filters for filtering and settling solids from wastewater and flow equalization ports for effecting flow equalization thereby eliminating flow surges to the downstream plugged soil absorption system.

Abstract: The septic tank of the subject invention can be provided in kit form, and preferably comprises a tank lid, a tank bottom, a pair of opposing side walls, and a pair of opposing end walls having a tank flow outlet and a tank flow inlet, where a flange is affixed within the tank flow outlet and the tank flow inlet. The tank lid comprises a pair of lid openings, which are covered by hatch covers. The hatch covers comprise a hatch handle for ease of removal and are removably affixed to the tank lid with angle connection brackets. The septic tank is assembled using angle connection brackets, where the brackets are affixed to the tank lid, tank bottom, side walls, and end walls using, for example, stainless steel cap screws. A silicone sealant is interposed between the tank lid, tank bottom, side walls, end walls and the connection brackets, forming a substantially leak proof seal.

Abstract: In place of the conventional aerobic treatment station, wastewater undergoes aeration in a treatment-pipe. The treatment-pipe has a long/narrow configuration. Open-cell foam serves as treatment material, in the treatment pipe, and promotes attachment of microbial colonies. Two or more treatment-pipes may be connected in series or parallel. Also, in place of a conventional septic tank, wastewater undergoes anaerobic treatment and settlement in a treatment-pipe. The treatment-pipe has a long/narrow configuration. End chambers provide inlet and outlet ports, a sump for collecting settled-out solids, and sealing attachments for the treatment-pipe itself.

Abstract: A device for diverting the flow of liquid in a wastewater treatment system in flow communication with effluent returning from a recirculating treatment section and in flow communication with a discharge line for removing a portion of treated effluent to a receiving body. The device also has openings for returning a percentage of the effluent back to the wastewater treatment system. A valve operatively responsive to a float in the treatment system whereby when the effluent level in the system falls below a critical point, all of the effluent is recirculated back into the treatment system and when the effluent level rises sufficiently a percentage of cleaned effluent exits the system.

Abstract: A standard 20 ft or 40 ft sea-freight shipping container is configured as a septic tank, or as an aerobic trickle filter station. The shipping-container is lined with a watertight shell or liner. The liner may be a preferabricated separate structure inserted into the container, and supported from the container walls. Or, the liner may be actually constructed inside the container, again taking mechanical support from the container walls. The openable doors at the end of the standard container are retained, a wall being added to the shipping-container a foot or two inside the doors to form the tank, leaving a utility room for pipework, valves, pumps, etc.

Abstract: A waste water filter comprises a shield comprising a vertical peripheral wall defining a shield interior. The shield further includes an inlet for the entry of unfiltered wastewater into the shield interior. A shield filter element is disposed within the shield interior. An outlet in fluid communication with the second interior location for discharging filtered waste water is also included into the waste water filter. The shield filter element includes at least one filter surface having filter surface openings for the passage of relatively clear water while restricting the passage of solids larger than the openings. The shield filter element, when disposed within the shield, separates the shield interior into first and second interior locations. Unfiltered or partially filtered waste water in the first interior location is separated from filtered waste water in the second location by the shield filter element. The shield filter element is removable from the shield.

Abstract: A radial flow septic tank includes: a main body having a wall and a floor defining a cavity; an inlet disposed at approximately a center of the cavity; an outlet having a collection device disposed around an inside perimeter of the wall of the main body; and a column disposed within the cavity at approximately the center of the main body, the column having openings to allow the flow to move from the inlet to the outlet.

Abstract: A simple, reliable, inexpensive, and efficient anaerobic digester for treating organic wastes at a shortened residence time is described. The anaerobic digester is a multi-chambered digester that can handle wastewater and sludge in a large volume at a high flow rate. The digester also allows collection of methane gas for use as an energy source. The reactor is based on a sequential series of reaction chambers in a design that does not require internal moving parts. The volume of the chambers is adjusted to control the relative residence time of the waste to select an anaerobic microorganism group or groups that can efficiently digest the waste presented to that chamber. Under most conditions, no addition of bacteria is necessary. The digester works efficiently using microbes native to the waste material. After the reaction chambers and just prior to leaving as effluent, a settling chamber is located to reclaim the microbes and remove additional solids.

Abstract: A filtration system for processing effluent from septic-based sanitation systems includes at least one treatment tank for receiving effluent from a septic tank. The tank includes filtering media therein, the filtering media adapted for filtering the effluent to produce filtered effluent. The system includes structure for recirculating the filtered effluent, wherein a first portion of the filtered effluent is directed back onto the filtering media and a second portion of the filtered effluent is directed out of said tank. The system can obviate the need for a drain field in septic-based sanitation systems.

Abstract: A septic tank having internal supports. The internal supports may be lateral or vertical supports integrally molded to the septic tank. The internal supports provide structural support for the septic tank under various loading conditions. The supports will thus substantially prevent cracking of the septic tank, as well as deformation of the septic tank, manhole and other components thereof. A mold for manufacturing the septic tank is also provided.

Abstract: Apparatus for treatment of sewage on vessels. The apparatus includes at least a first aeration chamber, a settling chamber, a disinfection chamber, and a storage container. In order to provide a multifunctional and efficient apparatus, the aeration chamber, the settling chamber, the disinfection chamber, and the storage container are integrated into the same structure.

Abstract: Phosphate-contaminated water passes through a domestic sewage treatment system, in which oxidation of the ammonium progresses far enough to cause a lowering of the pH to 5 or less. The water is passed over sand grains coated with aluminum hydroxide (gibbsite). Enough Al3+ ions enter solution, at the low pH, to cause all the phosphate-P to precipitate as aluminum phosphate, and nothing else precipitates other than the aluminum phosphate.

Abstract: Improved biofilters for treating wastewater are disclosed. Specifically, certain aspects of the inventive biofilter comprise a water-tight, leak proof container housing a plurality of sacks stacked upon one another. Alternatively, the water-tight container may contain course sand for use as a re-circulating sand filtration unit. In the first embodiment, each sack contains a composition of filtering material through which the wastewater influent flows prior to removal from the biofilter via a pump tank. Other aspects of the present invention include a biofilter having a plurality of apertures disposed through the floor and through which the wastewater effluent may flow to the underlying ground. The invention is also directed to novel compositions of filtering material for use in the inventive biofilters as well as conventional biofilters. Preferred compositions comprise peat, coconut fibers, large or open cell film block pieces, and course sand.

Abstract: A wastewater treatment system for use with a conventional septic tank, or other small-scale wastewater treatment facility, for enhancing wastewater treatment without requiring complex control or maintenance limitations. The system incorporates a plurality of primary functions that combine to oxidize, nitrify, denitrify and remove water borne total dissolved solids prior to effluent discharge. Included is a fluidized-bed reactor containing biofilm attached to carrier particulates for use in the purification of wastewater. The fluidized-bed reactor is configured to include two distinct regions, namely a “lower” aerobic region and an “upper” anoxic region, during normal operating conditions. The lower aerobic region uses aerobic facultative bacteria to oxidize Carbonaceous Biochemical Oxygen Demand (CBOD), organic (Kjeldahl) nitrogen, and ammonia while consuming the dissolved oxygen in the water.

Abstract: An apparatus provides for treatment of primary effluent from residential and commercial establishments to allow subsurface or surface disposable of wastewater.

Abstract: A metal stearate denitrification system utilizes insoluble and hydrophobic metal stearates as a carbon source for the bacterial substrate. The system in a long-term, low-maintenance denitrification cell is a flow-through plastic container having a replaceable porous liner filled with a porous and permeable mixture of metal stearate and volcanic scoria and a small amount of soil as a bacteria source. Oxidized effluent from an aerated home septic tank enters the container near its base and exits near its top. The insoluble and hydrophobic metal stearate remains in place as the fluid flows through the container. Over a time span of years, the metal stearate is gradually destroyed by bacteria using stearate as a metabolic food source. The aerobic bacteria first remove the dissolved oxygen in the entering fluid and then the anaerobic bacteria denitrify the nitrate.

Abstract: A source of sewage is coupled to a septic tank by an influent line. The outlet line is coupled to a sewage treatment plant by an outlet line. Sewage travels from the source to the septic tank where solid matter is filtered. Liquid matter passes through the septic tank into the outlet line where it transported to the sewage treatment plant to be treated. The outlet line may consist of an indefinite number of intermediary lines and valves, such as an effluent line adjacent to the septic tank, a distribution line adjacent to the sewage treatment plant, and a valve disposed in between the effluent line and the distribution line. The valve may be coupled to a leach field so that liquid matter traveling from the effluent line to the valve may be directed either to the leach field or the distribution line leading to the sewage treatment plant.

Abstract: A system for limiting the size of particulate matter entering a septic tank pump contains a strainer that has a straining screen through which the pump draws liquid from the septic tank. A nozzle receives some of the effluent being pumped by the pump and is aimed toward the screen for directing effluent toward the screen to dislodge particulate matter from an area of the screen while the pump draws liquid through the screen. The screen and nozzle are arranged for relative movement so that the area of the screen being acted on by the effluent from the nozzle changes as the pump operates. Various embodiments are disclosed.

Abstract: A water-tight fiberglass septic tank is strong enough to withstand live loads. The fiberglass septic tank is preferably designed with integral ribs to for structural strength. In one preferred embodiment, the tank is made in two unequal halves. The lower half comprises the major portion of the tank and includes a bottom, two endwalls and two sidewalls. The upper half comprises a cover. This arrangement allows the horizontal seam to be placed above the internal waterline, thereby protecting the seam from exposure to sewage. At least one of the endwalls includes a raised top portion that allows a pipe to be located near the top of the lower portion without passing through the seam between the upper and lower portions of the tank. The endwalls are also curved to allow for angled inlet and outlet pipe connections. The ribs are preferably internal and hollow. The lower portion of the tank is also preferably flat bottomed. A provision has been made for a self-locating baffle if required.

Abstract: An apparatus for converting a typical anaerobic septic tank system into an efficient aerobic treatment system for treatment of liquor containing biodegradable wastes. The apparatus includes a collapsible reactor module that can pass through a relatively small opening in a septic tank cover. The reactor module contains media through which liquor to be treated is recirculated and aerated.

Abstract: The present invention is a waste water filter for use in a septic tank. The waste water filter includes a shield comprising a vertical peripheral wall substantially impervious to the passage of unfiltered waste water. The shield includes an opening for the entry of unfiltered waste water into the interior of the shield. A filter element is disposed substantially within the shield interior. The filter element includes a filter surface having filtering openings for restricting the passage of waste water solids of a size larger than the filtering openings, while allowing the passage relatively clear water. A reservoir within which filtered waste water may be temporarily maintained is disposed at least partially within the interior of the shield. The reservoir includes at least a first vertical peripheral wall defining a chamber. The filter element may be removed from the shield without the separation of the reservoir from the shield.

Abstract: An apparatus for converting a typical anaerobic septic tank system into an efficient aerobic treatment system for treatment of liquor containing biodegradable wastes. The apparatus includes a collapsible reactor module that can pass through a relatively small opening in a septic tank cover. The reactor module contains media through which liquor to be treated is recirculated and aerated.

Abstract: A wastewater treatment system comprises a septic tank which flows liquid effluent through an aerobic filter. The aerobic filter has a textile filter media. In one aspect, the textile filter media has relatively high open area and relatively low or moderate water holding capacity. In another aspect, the filter media comprises a plurality of vertically oriented textile sheets having a relatively small gap between adjacent sheets.

Abstract: In a filtration system wherein wastewater is recirculated back through a filtration bed for a second pass therethrough, the recirculated wastewater being directed through a set of secondary distribution pipes located in the filtration bed below those distribution pipes through which the wastewater is first carried through the bed, with hood elements arched over the respective secondary pipes.

Abstract: A system for recapturing electrical energy from a waste stream is disclosed. Further, features of the invention can be used to reduce the energy required for waste stream processing. Various energy sources are identified within the waste stream, and source-specific modules are provided for converting the various sources into electrical energy.

Abstract: An aerobic treatment system for wastewater is disclosed herein. The aerobic treatment system is comprised of a basin, which receives wastewater through an inlet pipe, the inlet pipe depositing the untreated wastewater to the lower portion of the basin. The wastewater must then flow from the lower portion of the interior of the basin through a fibrous filter and through an outlet filter to the outlet section of the aerobic treatment system. While resident within the lower portion of the basin, the wastewater is treated through aeration by an insertion of air through an air inlet pipe and diffusing the air within the untreated wastewater below the fibrous filter. The entire aerobic treatment system of the present invention is designed such that the filtering mechanisms may be readily removed or cleaned on a routine basis by the user.

Abstract: The apparatus is a small flow wastewater treatment system. The system uses a recirculating packed media filter for the initial treatment of effluent from a device such as a septic tank. The incoming wastewater is furnished to the recirculating packed media filter intermittently to permit air into the filter for maintaining high levels of oxygen for bacteria action. The recirculating packed media filter is followed by a subsurface flow constructed wetland. The wastewater entering the apparatus of the invention is divided into two parts so that 5 to 25 percent of the incoming flow bypasses the recirculating packed media filter and goes directly into the subsurface flow constructed wetland to encourage bacteria action that converts nitrates into gaseous nitrogen.

Abstract: Provided is a low-noise, long-life electromagnetic blower that has a simple, low-priced configuration and can realize two different outputs, high and low. When the electromagnetic blower is operated with low output, coils of an electromagnet are connected in series with each other, and an alternating current is supplied from an AC power source. When the blower is operated with high output, on the other hand, current is supplied to the one coil only. In the case where the electromagnetic blower is used for sewage disposal, the electromagnetic blower is operated with low output during aeration and with high output during reverse cleaning operation. Thereupon, the electromagnetic blower can operate with low noise during aeration, and the efficiency of reverse cleaning can be improved. In order to operate the electromagnetic blower with high output, moreover, the coils of the electromagnet may be connected in parallel with each other.

Abstract: A flow distribution box for a wastewater treatment system includes an inlet into a back wall and outlets in the opposed outer side walls and front wall, the distribution box including a plurality of flow dividers therein to compartmentalize effluent within the flow distribution box. A flow director is disposed in the inlet into the flow distribution box for directing the flow into selected compartments within the distribution box. Each of the outlets in the box is in flow communication with a conduit leading into a selected area of a drain field.

Abstract: A filtering system for filtering effluent in a septic tank including an outer secondary filter secured within a pipe fitting, wherein the outer secondary filter includes a central opening passing therethrough; an inner primary filter, wherein the inner primary filter is slidingly engaged within the central opening in the outer secondary filter; and a filtering connection element, secured between the outer secondary filter and an inner surface of the pipe fitting, wherein the filtering connection element filters effluent passing upward through the filter pipe fitting and wherein upon removal of the inner primary filter, the outer secondary filter filters the effluent entering the pipe fitting before discharge. Either or both of the outer secondary filter or the inner primary filter may be formed with a biocide to retard the growth of biological material on their surfaces.