The invention relates to preventing microplastics from the entering the environment. In particular the invention is directed to regenerating the efficiency of filters for removing microfibers from washing machine waste water, as well as waste from other appliances and other sources of effluent with entrained microplastics. A separator is therefore provided for separating microplastics from waste water comprising a chamber with an inlet and an outlet, at least one sieve structure forming a permeable barrier between the inlet and the outlet and a wash apparatus for washing the sieve structure.

A wastewater filter cartridge includes a peripheral frame, two filter media sheets, two sets of angled fins, and a filtered water outlet. The two filter media sheets are attached to the peripheral frame in spaced face-to-face relation such that they combine with the peripheral frame to define an interior volume within the filter cartridge. At the same time, the two sets of angled fins are attached to the peripheral frame external to the interior volume and project away from the filter media sheets at oblique angles. As wastewater passes through the two filter media sheets into the interior of the filter cartridge, the two filter media sheets act to reduce the suspended solids in the wastewater. Once in the interior volume of the filter cartridge, the filtered water is collected via the filtered water outlet, which is connected to the interior volume.

A wastewater filter cartridge includes a peripheral frame, two filter media sheets, two sets of angled fins, and a filtered water outlet. The two filter media sheets are attached to the peripheral frame in spaced face-to-face relation such that they combine with the peripheral frame to define an interior volume within the filter cartridge. At the same time, the two sets of angled fins are attached to the peripheral frame external to the interior volume and project away from the filter media sheets at oblique angles. As wastewater passes through the two filter media sheets into the interior of the filter cartridge, the two filter media sheets act to reduce the suspended solids in the wastewater. Once in the interior volume of the filter cartridge, the filtered water is collected via the filtered water outlet, which is connected to the interior volume.

This application discloses a filtering system, an air conditioning system that includes the filtering system, and a cleaning method for a filtering system. An example filtering system includes a total liquid inlet, a total liquid outlet, a first Y-shaped strainer, and a second Y-shaped strainer. The first Y-shaped strainer includes a first liquid flow port, a second liquid flow port, and a first drainage port. The first liquid flow port is connected to the total liquid inlet by using a first pipeline, the second liquid flow port is connected to the total liquid outlet by using a second pipeline, and the first drainage port is connected to a first waste liquid area by using a third pipeline. The second Y-shaped strainer includes a third liquid flow port, a fourth liquid flow port, and a second drainage port, the third liquid flow port is connected to the total liquid inlet by using a fourth pipeline.

A pressure measuring device configured as a multi-function device operable as a differential pressure switch (DPS), a differential pressure transducer (DPT), a pressure switch (PS), a pressure transducer (PT) providing readings of high and low pressure zones, a data recording logger, and a backwashing controller. The pressure measuring device may use at least two piezoelectric sensors operable to measure pressure attributes. The associated electronic hardware, processing unit, cables and pressure tubing are retrofittable and packaged in a molded case, with no moving parts with the electronic hardware fully coated to make the device reliable and resistant to extreme environmental conditions. The device is configured for remote access, enabling remote device configuration, maintenance and servicing. The device is further operable to communicate with various external devices: a tablet, a smartphone and the like as a user interface and further provides wired interface with a programmable logic controller (PLC) via RS-485 interface.

A pressure measuring device configured as a multi-function device operable as a differential pressure switch (DPS), a differential pressure transducer (DPT), a pressure switch (PS), a pressure transducer (PT) providing readings of high and low pressure zones, a data recording logger, and a backwashing controller. The pressure measuring device may use at least two piezoelectric sensors operable to measure pressure attributes. The associated electronic hardware, processing unit, cables and pressure tubing are retrofittable and packaged in a molded case, with no moving parts with the electronic hardware fully coated to make the device reliable and resistant to extreme environmental conditions. The device is configured for remote access, enabling remote device configuration, maintenance and servicing. The device is further operable to communicate with various external devices: a tablet, a smartphone and the like as a user interface and further provides wired interface with a programmable logic controller (PLC) via RS-485 interface.

The present invention provides a multi plate screw press sludge dewatering machine and a helical shaft thereof. The multi plate screw press sludge dewatering machine includes fixed rings, movable rings, the helical shaft, a sludge inlet tank and a sludge discharging tank; the helical shaft adopts a variable diameter variable pitch helical shaft, a lead angle arrangement sequence of a helical blade of the whole helical shaft is gradual reduction from the sludge discharging tank to the sludge inlet tank, and the lead angle arrangement sequence is gradually reduced from 16°-22° to 6°-14°; a pitch of the helical shaft is gradually increased along a direction from the sludge inlet tank to the sludge discharging tank; a diameter of a shaft body of the helical shaft is gradually increased along with a direction of the sludge discharging tank from a ⅓ position of a shaft length; and blockage prevention plates are arranged on two sides of the bottom of the helical blade. The helical shaft in the present invention is specially designed, so that the pitch is more reasonable, a helical angle is gentler, frictional resistance when sludge passes through the helical shaft may be effectively reduced, and phenomena of shaft blockage and shaft sticking of the sludge may be reduced.

The present invention provides a multi plate screw press sludge dewatering machine and a helical shaft thereof. The multi plate screw press sludge dewatering machine includes fixed rings, movable rings, the helical shaft, a sludge inlet tank and a sludge discharging tank; the helical shaft adopts a variable diameter variable pitch helical shaft, a lead angle arrangement sequence of a helical blade of the whole helical shaft is gradual reduction from the sludge discharging tank to the sludge inlet tank, and the lead angle arrangement sequence is gradually reduced from 16°-22° to 6°-14°; a pitch of the helical shaft is gradually increased along a direction from the sludge inlet tank to the sludge discharging tank; a diameter of a shaft body of the helical shaft is gradually increased along with a direction of the sludge discharging tank from a ⅓ position of a shaft length; and blockage prevention plates are arranged on two sides of the bottom of the helical blade. The helical shaft in the present invention is specially designed, so that the pitch is more reasonable, a helical angle is gentler, frictional resistance when sludge passes through the helical shaft may be effectively reduced, and phenomena of shaft blockage and shaft sticking of the sludge may be reduced.

A filter device has a filter housing (1) having a fluid inlet (8) for unfiltered matter and having a fluid outlet (9) for filtrate, and has at least one one-piece or multi-part filter insert (15, 17) held in the filter housing (1). Filter insert (15, 17) can be cleaned using a backwash device (25) having at least one backwash element (31) in counter flow to the direction of filtration. The backwash element can be moved along the inside of the relevant filter insert (15, 17) by a fluid-conveying drive shaft (29) of a rotary drive (69, 71). The individual backwash element (31) has, at the end adjacent to this inside, at least one gap-shaped passage opening, which extends in parallel to the axis of rotation of the drive shaft (29) and which opens into a flow chamber connected to the drive shaft (29) in a fluid-conveying manner. At least one further backwash device (27) has a further backwash element (31). The fluid-conveying drive shaft (29) is divided into chambers (73, 75) separated from each other. One backwash element (31) of one backwash device (25) is connected to one of the chambers (73, 75). The other backwash element (31) of the other backwash device (27) is connected to another chamber (73, 75).

A filtration apparatus includes: a cylindrical filter element formed in a cylindrical shape to filter a target fluid guided through an one end opening of the filter element in such a manner that the target fluid passes in a direction from an inside toward an outside of the filter element; a backwashing mechanism drawing the filtered fluid in a direction from the outside toward the inside of the filter element; a high-pressure washing mechanism injecting a high-pressure fluid so as to pass through the filter element in the direction from the inside toward the outside of the filter element; and a rotary drive mechanism rotating the backwashing mechanism and the high-pressure washing mechanism around an axial line of the filter element in an internal space of the filter element.