Abstract: The invention relates to a liquid ring pump (1) for generating vacuum and for pumping a flow of sewage in a vacuum sewage system. The liquid ring pump comprises in the direction of the flow of sewage a pump inlet (11), an inlet chamber (13), a pump housing (14) provided with a rotor (15) arranged on a drive shaft (16) provided with a mechanical seal (20), an outlet chamber (17), and an pump outlet (19). The mechanical seal (20) is arranged within the outlet chamber (17). The outlet chamber (17) is provided with an integrated extension (18) providing an enlargement of the outlet chamber (17) in order to retain the flow of sewage in the outlet chamber (17) before it is discharged from the pump outlet (19) in order to improve the lubrication of the mechanical seal (20).

Abstract: The invention relates to a liquid ring pump (1) for generating vacuum and for pumping a flow of sewage in a vacuum sewage system. The liquid ring pump comprises in the direction of the flow of sewage a pump inlet (11), an inlet chamber (13), a pump housing (14) provided with a rotor (15) arranged on a drive shaft (16) provided with a mechanical seal (20), an outlet chamber (17), and an pump outlet (19). The mechanical seal (20) is arranged within the outlet chamber (17). The outlet chamber (17) is provided with an integrated extension (18) providing an enlargement of the outlet chamber (17)in order to retain the flow of sewage in the outlet chamber (17) before it is discharged from the pump outlet (19) in order to improve the lubrication of the mechanical seal (20).

Abstract: The invention relates to a vacuum sewage system, which includes a sanitary unit, such as a toilet unit, vacuum sewer piping (200) connected to the sanitary unit, a discharge valve between the sanitary unit and the vacuum sewer piping, and a vacuum generating device for generating vacuum in the vacuum sewer piping. The system comprises an on-line separator device (1) in the vacuum sewer piping (200, 201) and a first pump means (2) and a second pump means (3) connected in parallel with the on-line separator device (1). The first pump means (2) is a vacuum pump for generating vacuum in the vacuum sewer piping (200, 201) and for evacuating air from the sewage flow flowing into the on-line separator device (1) and the second pump means (3) is arranged for pumping mainly sewage from the sewage flow flowing into the on-line separator device (1).

Abstract: Vacuum sewer system comprising a source of sewage (101), sewer piping (102), a discharge valve (103) between the source of sewage and the sewer piping, means (104) for generating partial vacuum in the sewer piping, and a control means for controlling the operation of the discharge valve. The control means comprises a control mechanism (105) with a body part defining a series of chambers including a first end chamber and a second end chamber, wherein the first end chambers is provided with an activating means (106). The body part (12) is provided with a first port (8) for communication with a source of vacuum (102), a second port (9) for communication with the discharge valve (103) and a third port (10) for communication with an aeration means.

Abstract: Disclosed is a sewer system including a sewage receptacle, sewer piping connected to the sewage receptacle by means of a discharge valve, a mechanism for generating vacuum in the sewer piping, and a control mechanism for controlling the discharge valve. In order to achieve a more rapid closing of the discharge valve after discharge of the sewage from the sewage receptacle, the vacuum sewer system further comprises an aeration device in direct fluid communication with the discharge valve. The control mechanism is arranged to control the aeration device. Also disclosed is a discharge valve (2) for such a vacuum sewer system.

Abstract: The invention relates to a sewage treatment plant for treatment of waste fluid, said plant comprising at least one aeration chamber (2, 3), a settling chamber (4) and a disinfection chamber (5). In order to rationalize the layout and the structure of the sewage treatment plant (1), the at least one aeration chamber (2,3) and the settling chamber (4) are arranged in a structural unit comprising opposite end walls (101, 102), opposite side walls (103, 104), a bottom part (105) and a cover part (106). The disinfection chamber (5) is arranged separately outside one of said end walls (101, 102), side walls (103, 104), bottom part (105) or cover part (106) of the structural unit.

Abstract: A valve means for a flow pipe includes a cylindrical or sleeve like body part having a length which is longer than the extension of the flow opening in the flow pipe. The body part is fastenable to the flow pipe or to a branch part of the flow pipe by a connecting means, whereby the connecting means comprises a first flange extending in a first direction of the flow pipe and a second flange extending in a direction opposite to the first direction of the flow pipe, said first and second flanges being fastened to the body part. The body part is made of a flexible structure in order to provide for the valve function in a simple manner.

Abstract: A rinse fluid valve for use in a vacuum toilet system is disclosed. The vacuum toilet system includes a waste receptacle with a rinse fluid dispenser associated therewith and a source of rinse fluid. The rinse fluid valve has a housing with an inlet in fluid communication with the rinse fluid source and an outlet in fluid communication with the rinse fluid dispenser. A flow path extends from the inlet to the outlet. A moveable rinse fluid valve member is disposed in the flow path and movable between open and closed positions. A fuse valve is also disposed in the flow path and has a normally open position to allow fluid flow therethrough. The fuse valve is actuatable to a closed position after a desired volume of fluid has passed therethrough, thereby to cease rinse fluid flow through the flow path.

Abstract: A discharge valve is disclosed for use in a vacuum toilet system having a waste receptacle defining an outlet and a sewer line placeable under partial vacuum. The discharge valve comprises a housing defining an inlet and an outlet, and a rotatable discharge valve member disposed in the housing for selectively establishing fluid communication between the inlet and the outlet. A periphery of the disk valve member being formed with a series of gear teeth. An actuator is provided having a rotatable spur gear adapted to engage the periphery of the discharge valve member.

Abstract: A vacuum waste tank for use in a vacuum drainage system. The tank has a vacuum intake for attachment to a vacuum source and a waste water intake for attachment to a vacuum pipe. The vacuum source creates a negative pressure in the tank and vacuum pipe so that liquid entering the pipe is pulled into the tank. The tank is made of a thermoplastic material having a flexural modulus sufficient to withstand an external pressure loading caused by the vacuum in the tank without buckling.

Abstract: A vacuum sewer system (1) comprises a source of sewage (2) and sewer piping (3) comprising a first sewer pipe (31) and a second sewer pipe (32). A first sewer valve (21) provided with an outlet port (22) is arranged between the source of sewage (2) and the first sewer pipe (31) and a second sewer valve (23) is arranged between the first sewer pipe (31) and the second sewer pipe (32), whereby the system comprises a vacuum generating means (36) for providing vacuum in the sewer piping (3). In order to minimize the noise level and the space requirement of the system the first sewer pipe (31) provides an intermediate receptacle for the sewage.

Abstract: A method and device for separating grease from waste water. The separator device includes a receptacle with an upper first part and a lower second part separated by a plate. The receptacle further has an inlet port for waste water, a discharge port for separated waste water, discharge means for grease and/or sludge, and an overflow pipe establishing a connection between the receptacle first part and the receptacle second part. Waste water is supplied through the inlet port to the upper first part, and the waste water is allowed to undergo a separation by gravity, whereby a grease layer is formed on a separated waste water layer and a sludge layer on the plate. In order to achieve a high degree of separation, separated waste water is allowed to flow through the overflow pipe to the receptacle lower second part. Grease is removed from the grease layer and/or sludge from the sludge layer through the discharge means, and separated waste water is discharged through the discharge port.

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: A vacuum bowl assembly for use in a vacuum toilet positioned on a support surface and having a discharge valve. The vacuum bowl assembly comprises a frame having a bottom member adapted to engage the support surface, and a top member defining a shoulder. A removable bowl is provided having a flange extending about an upper edge sized to engage the shoulder, and an outlet adapted for fluid communication with the discharge valve.

Abstract: A modular vacuum toilet, and a method of servicing such a toilet, are disclosed. The toilet is used with a vacuum toilet system having a sewer line placeable under partial vacuum pressure and a source of rinse fluid. The modular vacuum toilet comprises a frame and a removable bowl engaging and supported be the frame, the bowl defining an outlet and having a rinse fluid dispenser associated therewith. The modular vacuum toilet also has a valve set module. The valve set module includes a discharge valve having an inlet in fluid communication with the bowl outlet, an outlet in fluid communication with the sewer line, and a movable discharge valve member disposed between the discharge valve inlet and outlet. A rinse fluid valve is also incorporated into the valve set module and has an inlet in fluid communication with the source of rinse fluid, an outlet in fluid communication with the rinse fluid dispenser, and a movable rinse fluid valve member disposed between the rinse fluid valve inlet and outlet.

Abstract: The invention relates to an arrangement in a vacuum sewer system, which comprises a sewer network having a sewage source and sewer piping adapted for receiving sewage from the sewage source. A liquid driven ejector device functions as a source of vacuum for the vacuum sewer system. In order to improve the efficiency of and to ensure the function of the ejector device, the ejector device forms a primary circuit, which is separated from a secondary circuit formed by the sewage collecting process.

Abstract: The invention relates to a method for transporting sewage in a vacuum system, which comprises a source (2) of sewage, which through sewer piping (1) is connected to a collecting or discharge space (15) for sewage, and means (4,5) for generating vacuum in the sewer piping (1). In order to attain a reliably operating system the method employs a rotary lobe pump (4,5) for generating vacuum, transported through the rotary lobe pump (4,5) to the collecting or discharge space (15) for sewage. The rotary lobe pump can also be used for emptying the collecting space.

Abstract: A buffer box for use in a vacuum drainage system. The buffer box defines a reservoir of known effective size which provides substantially consistently sized slugs of liquid which may be efficiently pulled up a vertical lift. The buffer box includes an outlet and an air intake orifice which may be sized relative to one another so that only liquid from the reservoir is evacuated. The outlet has an upper edge which may be spaced from a base portion of the buffer box at a height which optimizes liquid velocity out of the box and defines a level above which only water is evacuated from the reservoir.

Abstract: A vacuum waste system is disclosed having a receptacle for receiving waste, the receptacle having an outlet, and a collection tank in fluid communication with the receptacle outlet. A vacuum source is in fluid communication with the collection tank to produce a partial vacuum in the collection tank. A flush actuator is provided that is operable to generate a flush command, and a flush valve is disposed between the toilet outlet and the collection tank having a normally closed position, the flush valve actuating to an open position for a flush interval in response to the flush command, thereby to control fluid communication between the collection tank and toilet outlet. A vacuum control valve is disposed between the vacuum source and the collection tank, the vacuum control valve being operable between open and closed positions thereby to control fluid communication between the collection tank and vacuum source.

Abstract: A discharge valve is disclosed for use in a vacuum toilet system having a waste receptacle defining an outlet and a sewer line placeable under partial vacuum. The discharge valve comprises a housing defining an inlet and an outlet, and a rotatable discharge valve member disposed in the housing for selectively establishing fluid communication between the inlet and the outlet. A periphery of the disk valve member being formed with a series of gear teeth. An actuator is provided having a rotatable spur gear adapted to engage the periphery of the discharge valve member.