1. A wastewater treatment system, comprising:
a hollow, elongate, cylindrical body made from plastic, the cylindrical body having reinforcement ribs formed by a helically wound steel band embedded in the plastic and extending between opposite ends of the elongate cylindrical body;
end members extending across and covering the opposite ends of the cylindrical body, the end members and the cylindrical body forming a watertight tank defining at least one chamber adapted for treatment of wastewater;
an inlet pipe extending into the tank adapted for admitting wastewater into the tank; and
an outlet pipe extending from the tank adapted for discharging treated wastewater from the tank.
2. The wastewater treatment system according to claim 1, wherein said cylindrical body is made from high-density polyethylene.
3. The wastewater treatment system according to claim 2, further comprising an access hatch formed in one of said end members.
4. The wastewater treatment system according to claim 2, wherein said tank is oriented vertically.
5. The wastewater treatment system according to claim 4, wherein:
said inlet pipe consists of a single inlet pipe; and
said outlet pipe consists of a single outlet pipe.
6. The wastewater treatment system according to claim 5, further comprising:
first and second partition walls dividing said tank into three chambers, including:
an anoxic first chamber adapted for housing bacteria, said inlet pipe extending into the first chamber, wherein the bacteria is selected from the group consisting of anaerobic bacteria and facultative bacteria;
a second chamber forming a bioreactor adapted for housing aerobic bacteria;
a third chamber forming a clarifier, said outlet pipe extending from the third chamber;
a first conduit extending between the first chamber and the second chamber for passing partially treated wastewater from the anoxic chamber to the bioreactor chamber; and
a second conduit extending between the second chamber and the third chamber for passing partially treated wastewater from the bioreactor chamber to the clarifier chamber.
7. The wastewater treatment system according to claim 6, further comprising:
an first effluent filter disposed in the anoxic first chamber for filtering undigested organic matter in the partially treated wastewater before passing the partially treated wastewater to the bioreactor chamber;
a source of pressurized air;
an air conduit extending from the source of pressurized air into the bioreactor chamber;
an air diffuser connected to the air conduit, the diffuser being disposed in the bioreactor chamber and producing a stream of air bubbles;
a fixed film assembly disposed in the bioreactor chamber for supporting growth of the aerobic bacteria;
a return activated sludge pump disposed in the clarifier chamber for feedback of activated sludge from the clarifier chamber to the anoxic first chamber for further wastewater treatment; and
siphon-ejection air lift assembly disposed in the clarifier chamber for feedback of surface scum from the clarifier chamber to the bioreactor chamber.
8. The wastewater treatment system according to claim 7, further comprising:
a baffle wall disposed in the bioreactor chamber; and
a stilling well disposed behind the baffle wall, said siphon-ejection air lift assembly feeding the surface scum in the clarifier chamber back to the stilling well for further wastewater treatment.
9. The wastewater treatment system according to claim 7, wherein said source of pressurized air comprises a blower assembly.
10. The wastewater treatment system according to claim 7, wherein said source of pressurized air comprises a mechanical air pumping system.
11. The wastewater treatment system according to claim 4, further comprising:
a first partition wall extending substantially diametrically across the cylindrical body between the opposing ends, bisecting the cylindrical body to form two semicylindrical chambers;
a second partition wall extending substantially orthogonal to the first partition wall between the opposing ends, bisecting one of the semicylindrical chambers to form a first anoxic chamber, a second bioreactor chamber, the bioreactor chamber being semicylindrical, and a third clarifier chamber adjacent to both the first and second chambers;
a first series of conduits extending through the first and second partition walls for passing wastewater sequentially through the first, second and third chambers for progressive stages in wastewater treatment; and;
a second series of conduits for feedback of surface scum from the third clarifier chamber to the second bioreactor chamber, and for feedback of activated sludge from the third clarifier chamber to the first anoxic chamber for further stages of wastewater treatment.
12. The wastewater treatment system according to claim 11, further comprising an electronic control unit regulating flow of wastewater between the three chambers, the feedback of surface scum and activated sludge between the chambers, and the inlet and outlet of wastewater into and from said tank.
13. The wastewater treatment system according to claim 2, wherein said tank is oriented horizontally.
14. The wastewater treatment system according to claim 13, further comprising an access hatch formed in one of said end members.
15. The wastewater treatment system according to claim 13, wherein said end members are planar.
16. The wastewater treatment system according to claim 13, wherein said end members are substantially hemispherical.
17. The wastewater treatment system according to claim 13, further comprising:
a container, said tank being enclosed in the container; and
thermal insulation disposed between said tank and the container, the thermal insulation including closed-cell urethane foam insulation.
18. The wastewater treatment system according to claim 13, further comprising:
a plurality of vertically extending baffles separating said cylindrical body into a plurality of adjacent compartments adapted for treating wastewater, including a flow equalization and influent pumping compartment, an anoxic compartment, a bioreactor compartment, a clarification compartment for effluent polishing, and a sludge digestion compartment;
a pump and pump control system disposed in the flow equalization and influent pumping compartment for monitoring water levels and pumping wastewater to the anoxic compartment as needed;
an inlet pipe extending into the anoxic compartment, the anoxic compartment being adapted for mixing incoming wastewater with anaerobic bacteria;
an air diffuser disposed in the bioreactor compartment for aerating wastewater in the bioreactor compartment, the bioreactor compartment being adapted for treating the wastewater with aerobic bacteria;
a pump disposed in the bioreactor compartment for pumping mixed liquor suspended solids from the bioreactor compartment back to the anoxic compartment for further treatment;
a fixed film media assembly disposed in the bioreactor compartment for fostering growth of aerobic bacteria and resulting formation of suspended growth and attached growth biomass;
a stilling well assembly disposed in the bioreactor compartment;
a sloped sump assembly disposed in the clarifier compartment;
thermal insulation disposed beneath said sloped sump assembly, the thermal insulation including closed-cell urethane foam insulation;
a return activated sludge pump disposed in the clarifier compartment for feeding activated sludge back to the bioreactor compartment for further treatment;
a discharge weir disposed in the clarifier compartment;
a scum removal assembly disposed in the clarifier compartment for feeding surface scum back to the bioreactor compartment for further treatment;
a diffuser disposed in the sludge digester compartment for aerating and mixing waste sludge;
a pump assembly disposed in the sludge digester compartment for pumping supernatant water from the sludge digester compartment back to the bioreactor compartment for further treatment; and
a plurality of access hatches providing access to each of the compartments.
19. The wastewater treatment system according to claim 13, further comprising:
a plurality of vertically extending baffles separating said cylindrical body into a plurality of adjacent compartments adapted for treating wastewater, including a flow equalization and influent pumping compartment, an anoxic compartment, a bioreactor compartment, a membrane compartment for effluent filtration, and a sludge digestion compartment;
a pump and pump control system disposed in the flow equalization and influent pumping compartment for monitoring water levels and pumping wastewater to the anoxic compartment as needed;
an inlet pipe extending into the anoxic compartment, the anoxic compartment being adapted for mixing incoming wastewater with anaerobic bacteria and facultative bacteria;
an air diffuser disposed in the bioreactor compartment for aerating wastewater in the bioreactor compartment, the bioreactor compartment being adapted for treating the wastewater with aerobic bacteria;
a pump disposed in the bioreactor compartment for pumping mixed liquor suspended solids from the bioreactor compartment back to the anoxic compartment for further treatment;
a fixed film media assembly disposed in the bioreactor compartment for fostering growth of aerobic bacteria and resulting formation of attached growth and suspended growth biomass;
a stilling well assembly disposed in the bioreactor compartment;
a membrane filter assembly disposed in the membrane compartment;
a membrane blower assembly aerating the membrane filter assembly;
a plurality of control members disposed in the membrane compartment, wherein the control members are selected from the group consisting of pressure transducers and float switches;
a recirculation pump disposed in the bioreactor compartment, the recirculation pump being connected to the control members and being configured to optionally pump mixed liquor to the membrane compartment or to the sludge digestion compartment in order to maintain water levels in the membrane compartment for proper operation of the membrane filter assembly;
a diffuser disposed in the sludge digester compartment for aerating and mixing waste sludge;
a pump assembly disposed in the sludge digester compartment for pumping supernatant water from the sludge digester compartment back to the bioreactor compartment for further treatment;
a plurality of access hatches providing access to each of the compartments; and
a plurality of plastic aeration and process piping supports.
20. The wastewater treatment system according to claim 13, further comprising:
a baffle wall disposed in the cylindrical body, the baffle wall separating the tank into a solids tank region adapted for anoxic treatment of wastewater containing solids with anaerobic bacteria and a pump tank region;
a discharge pump disposed in the pump tank region for pumping treated wastewater to the outlet pipe; and
an effluent filter disposed between the solids tank region and the pump tank region.
21. The wastewater treatment system according to claim 1, further comprising a wastewater treatment unit disposed in the tank.
22. The wastewater treatment system according to claim 21, wherein the wastewater treatment unit is selected from the group consisting of an activated sludgeextended aeration (ASEA) treatment unit, an integrated fixed film activated sludge (IFAS) treatment unit, a moving bed biological reactor (MBBR) treatment unit, a sequencing batch reactor (SBR) treatment unit, a trickling filter (TF) treatment unit, a biofilter (BFBAF) treatment unit, and a membrane bioreactor (MBR) treatment unit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A display device comprising:
a power supply line;
a scan line driver circuit;
a scan line having one end electrically connected to the scan line driver circuit; and
a scan line auxiliary circuit electrically connected to the other end of the scan line, the scan line auxiliary circuit including at least one switching element,
wherein the scan line is capable of being electrically connected to the power supply line through the switching element by controlling the switching element with a signal potential of the scan line.
2. The display device according to claim 1, wherein the signal potential supplied from the scan line driver circuit is equal to a potential of the power supply line.
3. A display device comprising:
a power supply line;
a scan line driver circuit;
a scan line; and
a switching element,
wherein one end of the scan line is electrically connected to the scan line driver circuit;
wherein the other end of the scan line is electrically connected to the power supply line through the switching element; and
wherein the scan line is capable of being electrically connected to the power supply line by controlling the switching element with a signal potential of the scan line or a signal potential of the scan line driver circuit.
4. The display device according to claim 3, wherein the signal potential supplied from the scan line driver circuit is equal to a potential of the power supply line.
5. A display device comprising:
a power supply line;
a first scan line driver circuit;
a second scan line driver circuit;
a first scan line having one end electrically connected to the first scan line driver circuit;
a second scan line having one end electrically connected to the second scan line driver circuit; and
a scan line auxiliary circuit electrically connected to the other end of the first scan line, the scan line auxiliary circuit including at least one switching element,
wherein the first scan line is capable of being electrically connected to the power supply line through the switching element by controlling the switching element with a signal potential of the first scan line and a signal potential of the second scan line which is supplied from the second scan line driver circuit.
6. The display device according to claim 5, wherein the signal potential of the first scan line is inverted when the switching element is controlled.
7. The display device according to claim 5, wherein the signal potential supplied from the first scan line driver circuit is equal to a potential of the power supply line.
8. A display device comprising:
a power supply line;
a first scan line driver circuit electrically connected to one end of a first scan line;
a second scan line driver circuit electrically connected to one end of a second scan line;
a current supply line;
a light-emitting element;
a scan line auxiliary circuit electrically connected to the other end of the first scan line, the scan line auxiliary circuit including at least one switching element;
a driving transistor electrically connected in series between the current supply line and the light-emitting element;
a storage capacitor, one electrode of which is electrically connected to a gate electrode of the driving transistor, and the other electrode of which is electrically connected to the current supply line;
a reset transistor, a gate electrode of which is electrically connected to the first scan line, and one of a source electrode and a drain electrode of which is electrically connected to the current supply line;
a switch transistor having a gate electrode electrically connected to the second scan line, the switch transistor being electrically connected between the other of the source electrode and the drain electrode of the reset transistor and one electrode of the storage capacitor; and
a selection transistor having a gate electrode electrically connected to a data line, the selection transistor being electrically connected in series between the switch transistor and the first scan line,
wherein the first scan line is capable of being electrically connected to the power supply line through the switching element, and a gate potential of the driving transistor is set equal to a potential of the power supply line, by controlling the switching element with a signal potential of the first scan line and a signal potential of the second scan line which is supplied from the second scan line driver circuit.
9. The display device according to claim 8, wherein the signal potential of the first scan line is inverted when the switching element is controlled.
10. The display device according to claim 8, wherein the signal potential supplied from the first scan line driver circuit is equal to a potential of the power supply line.
11. A display device comprising:
a power supply line;
a first scan line driver circuit electrically connected to one end of a first scan line;
a second scan line driver circuit electrically connected one end of a second scan line;
a first transistor;
a second transistor; and
an inverter,
wherein the other end of the first scan line is electrically connected to an input terminal of the inverter;
wherein a gate electrode of the first transistor is electrically connected to an output terminal of the inverter;
wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to the other end of the first scan line;
wherein a gate electrode of the second transistor is electrically connected to one end of the second scan line or the second scan line driver circuit;
wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to the other of the source electrode and the drain electrode of the first transistor; and
wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the power supply line.
12. The display device according to claim 11, wherein the signal potential supplied from the first scan line driver circuit is equal to a potential of the power supply line.