A runoff yield calculation method and device based on double free reservoirs, and a storage medium are provided, the method includes: forming a four-layer vadose zone structure by making a tension water storage layer be located under a deep vadose zone based on a three-layer vadose zone structure of a Xin'anjiang model; dividing a space occupied by free water in the four-layer vadose zone structure into an upper free reservoir and a lower free reservoir; calculating a time interval runoff yield by using a saturation excess runoff method; and dividing, based on a runoff yield structure of the double free reservoirs, the time interval runoff yield into a surface runoff, an interflow and a subsurface runoff. The method proposes a runoff yield structure of double free reservoirs, which can be well applied to semi-arid and semi humid watersheds with deeper buried depth of shallow groundwater.

A distributed control system for a vacuum sewer system comprising a suction pipe which is communicated with a vacuum source via a transport conduit (520) by opening a vacuum valve (530) using a solenoid valve is disclosed. The transport conduit is connected between the vacuum valve and a collection tank, with the collection tank having a vacuum source relative to atmospheric pressure applied thereto. The suction pipe is connected between the vacuum valve and a sewage sump, with the sewage sump have a source of sewage maintained at atmospheric pressure. Sewage (551) in the sump is sucked through the suction pipe and sent to the collection tank via the transport conduit by opening the vacuum valve. A transport conduit section is laid out in a sawtooth fashion, having in series transport conduit portions comprising a low-point conduit portion (522), a riser conduit portion (521), and a down-slope conduit portion (523). A valve pit apparatus (500) for control and monitoring the valve pit operations is provided with a battery powered electronic computer, a plurality of sensors, and a solenoid valve. A transport conduit apparatus for monitoring the transport conduit conditions is provided with a riser conduit sensor (550) capable of detecting sewage conditions within the riser and communicating the conditions to a computer (551) for processing. When the vacuum valve (530) is intermittently opened by control of the valve pit apparatus (500), sewage (551) in the sump is intermittently injected under the influence of atmospheric pressure into the transport conduit (520) for transportation to the collection tank, which passes through the transport conduit riser (521) and detected by the transport conduit apparatus for processing. The results of the valve pit apparatus and the transport conduit apparatus processing are stored in computer memory as operating parameters and then wirelessly communicated to devices external of the valve pit apparatus and transport conduit apparatus. The distributed control system provides an apparatus and method for control and monitoring of the vacuum sewer system, which is complex in sensor placement operating parameters processing but simple in structure, easy to maintain and capable of stable operation.

A method is provided for operating a wastewater pumping station of a wastewater pumping network. The pumping station includes a pump, that starts pumping if a level of a wastewater in a tank exceeds a first wastewater level, and the pump stops pumping if the level of the wastewater in the tank drops below a second level. The method includes determining a magnitude of a parameter (P.sub.sys, Q, n, ΔP, P.sub.electrical, cos φ, I) expressing the load of the wastewater pumping network. If it is determined that the magnitude of the parameter has passed a specified threshold, the pump is activated to start pumping in an energy optimization mode. A control unit is also provided for the wastewater pumping station of the wastewater pumping network, and a system is provided for centrally controlling a plurality of pumps of wastewater pumping stations in a wastewater pumping network.

Embodiments of the present disclosure generally provide a grey water interface valve liquid level sensor system. The liquid level sensor system may deliver information about the water level and the water movement that occurs in a water reservoir. A control unit may then activate a valve to open so that the water can be removed via vacuum.

A vacuum sewage system includes a check valve having a body, a sealing member and a cover. The body includes a housing. The sealing member has a first section and a central section connected to the first section. The central section of the sealing member has a sealing surface. The cover has an interior chamber, a connector having a passageway in communication with the interior chamber, and a front wall having a central section. The central section of the front wall has a sealing surface. The central section of the sealing member is moveable from a first position in which the sealing surface of the sealing member is in contact with the sealing surface of the central section of the front wall of the cover to a second position in which the sealing surface of the central section of the sealing member is spaced apart from the sealing surface of the central section of the front wall of the cover.

An example system includes a valve between a suction pipe extending into a sewage pit and a vacuum pipe connected to a sewer system. The vacuum pipe has vacuum pressure. The valve is controllable to open to allow content to flow from the sewage pit, through the suction pipe, and into the vacuum pipe. A sensor is configured to detect the vacuum pressure in the vacuum pipe. The valve is controllable to open for a duration that is based, at least in part, on the vacuum pressure in the vacuum pipe.

An example apparatus is for use in a system that includes a sewage pit, a suction pipe in the sewage pit, and a valve between the suction pipe and a vacuum pipe that connects to a sewer system. The apparatus includes a controller configured to perform operations that include: detecting a vacuum pressure in the vacuum pipe, determining that the vacuum pressure in the vacuum pipe is below a predefined pressure, and preventing the valve from opening in response to determining that the vacuum pressure in the vacuum pipe is below the predefined pressure.

A separator for separating objects from a liquid flow in a pipe system is disclosed. The separator has a separator housing (4) and at least one filter in the form of a plurality of filter structures (29, 32) extending into the separator housing. The separator may be used in e.g. a vacuum sewage system, a water supply system, 5 or a pipe system for wastewater.

Method of controlling a vacuum waste system, which comprises a number of sources of waste (9), vacuum sewer piping (7) including at least a branch pipe (71) and at least a main pipe line (72), a discharge valve (8) having an inlet end connected to a source of waste and an outlet end provided with a given type of connection to the vacuum sewer piping, and a vacuum unit (11) connected to the vacuum sewer piping. Vacuum is generated in the vacuum sewer piping by the vacuum unit and a discharge sequence for discharging waste from the source of waste into the vacuum sewer piping is activated by a discharge sequence activating means (20), whereby the discharge sequence is set for a predetermined time. In order to achieve an optimized control of the vacuum waste system, the predetermined time for a discharge sequence for a source of waste is set according to the given type of connection (711, 712) of the discharge valve to the vacuum sewer piping or according to the location (L1, L2) of the discharge valve with respect to the vacuum sewer piping.

A vacuum sewage system includes a sump pit for receiving sewage, a valve pit, a valve, a sensor-controller, a first sensor pipe, a sump breather and a second sensor pipe. The sensor-controller activates the valve so as to discharge sewage from the sump pit. The first sensor pipe communicates pressure to the sensor-controller as the level of sewage rises within the sump pit. The second sensor pipe communicates pressure to the sump breather to move the sump breather from a first state to a second state to prevent sewage from entering the sensor-controller and valve. Alternatively, the system may be provided with a single sensor pipe that communicates pressure to both the sensor-controller and to the sump breather.