NZ796762B2 - Stormwater treatment device - Google Patents
Stormwater treatment device Download PDFInfo
- Publication number
- NZ796762B2 NZ796762B2 NZ796762A NZ79676221A NZ796762B2 NZ 796762 B2 NZ796762 B2 NZ 796762B2 NZ 796762 A NZ796762 A NZ 796762A NZ 79676221 A NZ79676221 A NZ 79676221A NZ 796762 B2 NZ796762 B2 NZ 796762B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- screen unit
- path
- bay
- inlet
- water
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 26
- 239000010813 municipal solid waste Substances 0.000 claims abstract 23
- 238000012216 screening Methods 0.000 claims abstract 13
- 230000002401 inhibitory effect Effects 0.000 claims abstract 2
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/58—Power supply means for regenerating the filter
- B01D2201/583—Power supply means for regenerating the filter using the kinetic energy of the fluid circulating in the filtering device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2221/00—Applications of separation devices
- B01D2221/12—Separation devices for treating rain or storm water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
Abstract
stormwater treatment device includes a tank defining an internal volume and having an inlet and an outlet, a rotatable screen unit mounted within the tank, the rotatable screen unit being barrel-shaped to define a through path with an inlet end and an outlet end. The rotatable screen unit includes a screen structure with a plurality of screening openings for allowing passage of at least some water from the through path outwardly through the screen structure while inhibiting passage of trash items through the screen structure such that trash items move along the through path from the inlet end to the outlet end. The rotatable screen unit includes a plurality of external drive paddles that rotate with the screen structure and that interact with water that has been screened by passing outwardly through the screen structure interacts with the external drive paddles to cause rotation of the rotatable screen unit. The rotation of the screen is self-powered since it is driven by the paddles.
Claims (20)
1. A stormwater treatment , comprising: a tank defining an internal volume and having an inlet and an outlet; a rotatable screen unit mounted within the tank, the rotatable screen unit being barrel-shaped to define a through path with an inlet end and an outlet end, the rotatable screen unit includes a screen structure with a ity of screening openings for allowing passage of at least some water from the through path outwardly h the screen structure while ting passage of trash items through the screen structure such that trash items move along the through path from the inlet end to the outlet end; wherein the rotatable screen unit includes a plurality of external drive paddles that rotate with the screen structure and that drive rotation of the screen structure by interacting with water that has been screened by passing outwardly through the screen structure.
2. The stormwater treatment device of claim 1, wherein the rotatable screen unit further es a plurality of internal blades, within the through path, and which rotate with the screen structure, wherein the internal blades are configured to direct at least some water moving along the through path upwardly along the screen structure.
3. The stormwater treatment device of claim 2, wherein each internal blade runs in a l pattern along an al surface of the screen structure, wherein each external drive paddle is configured as a trough structure.
4. The stormwater treatment device of claim 3, wherein the trough structure has a V- shaped end profile.
5. The stormwater treatment device of claim 2, wherein each internal blade is configured to push trash items along the through path and out of the outlet end of the through path.
6. The stormwater treatment device of claim 1, r sing: an insert within the tank, the insert configured to define: an inlet bay into which water from the inlet of the tank flows, the inlet bay including an outlet opening positioned such that the inlet end of the through path is open to the inlet bay for water entry; an outlet bay for delivering water to the outlet of the tank; a trash bay located at the outlet end of the through path; a support housing for the rotatable screen unit, wherein the support housing defines a path at an external e side of the screen structure for allowing at least some water that passes through the screening openings to move to the outlet bay without such water passing h the outlet end of the rotatable screen unit into the trash bay; wherein trash items that pass along the through path and out of the outlet end of the rotatable screen unit are captured within the trash bay.
7. The stormwater treatment device of claim 6, wherein the insert further comprises a flow path from the trash bay to the outlet bay, with at least one trash bay screen d along the flow path to maintain captured trash debris within the trash bay while ng water that enters the trash bay to flow to the outlet bay.
8. The stormwater treatment device of claim 7, n the trash bay screen is located at a height to permit water level equalization between the trash bay and the outlet bay during lower flow conditions.
9. The stormwater treatment device of claim 1, further sing: an insert within the tank, the insert configured to define: a t housing for the rotatable screen unit, the support housing carrying a plurality of bearing assemblies to permit rotation of the rotatable screen unit.
10. The stormwater treatment device of claim 9, wherein at least some of the bearing assemblies include a thrust bearing for limiting axial movement of the rotatable screen unit and a track bearing to support rotation of the rotatable screen unit.
11. The stormwater treatment device of claim 1, further comprising: an insert within the tank, the insert configured to define: an inlet bay into which water from the inlet of the tank flows, the inlet bay including an outlet opening positioned such that the inlet end of the through path is open to the inlet bay for water entry; an outlet bay for delivering water to the outlet of the tank; a trash bay located at the outlet end of the h path;
12. The stormwater treatment device of claim 11, wherein the insert is further configured to define a path at an external surface side of the screen structure for delivering at least some water that passes through the screening openings to the outlet bay and toward the outlet of the tank without such water passing through the outlet end of the rotatable screen unit into the trash bay, wherein at least part of that path extends under the rotatable screen unit in a direction to continue to drive the rotatable screen unit as the water moves toward the outlet of the tank.
13. The stormwater ent device of claim 1, wherein the rotatable screen unit is a first ble screen unit, and the device further ses a second rotatable screen unit, the second rotatable screen unit being barrel-shaped to define a second through path with an inlet end and an outlet end, the second ble screen unit having a second screen structure with a plurality of screening openings for allowing passage of water therethrough while inhibiting passage of trash items through the screening openings of the second screen structure such that trash items move along the second through path from the inlet end to the outlet end, n the second rotatable screen unit includes a plurality of external drive paddles that rotate with the second screen structure and that interact with water that has been screened by passing outwardly through the second screen ure interacts with the external drive paddles to cause on of the second rotatable screen unit.
14. The stormwater treatment device of claim 1, wherein the rotatable screen unit is oriented such that a rotation axis of the rotatable screen unit runs transverse to an inlet flow direction of water flowing into the inlet of the tank.
15. The stormwater treatment device of claim 14, wherein the rotation axis runs substantially perpendicular to the inlet flow direction.
16. The stormwater treatment device of claim 14, further comprising a wall member that deflects water entering the inlet of the tank to dissipate energy.
17. A stormwater treatment device, comprising: a tank defining an internal volume and having an inlet and an ; a rotatable screen unit mounted within the tank, the rotatable screen unit being barrel-shaped to define an axial through path with an inlet end and an outlet end, the rotatable screen unit having a plurality of screening gs for allowing passage of water therethrough while preventing passage of trash items h the screening gs so that trash items within the axial through path move from the inlet end to the outlet end; wherein the rotatable screen unit has a rotation axis that runs transverse to an inlet flow direction of water entering the inlet; wherein the ble screen unit includes a plurality of al paddles that are oriented such that at least some screened water that passes through the screening openings drives rotation of the rotatable screen unit.
18. The stormwater treatment device of claim 17, n the rotation axis runs substantially perpendicular to the inlet flow direction.
19. The stormwater treatment device of claim 17, wherein the rotatable screen unit includes: (i) at least one internal blade within the through path such that water entering the inlet end of the through path interacts with the internal blade to move upward along a height of the rotatable screen unit.
20. A method of treating stormwater, comprising: flowing stormwater into a tank in which a rotatable screen unit is located, the ble screen unit shaped to define an axial through path with an inlet end and an outlet end, the rotatable screen unit having a plurality of screening openings for allowing passage of stormwater therethrough while ting passage of trash items through the screening openings; flowing the stormwater into the inlet end of the rotatable screen unit, n at least some stormwater passes through the screening openings for screening and interacts with externally d drive blades of the rotatable screen unit to drive rotation of the rotatable screen unit. WO 35751 WO 35751 WO 35751 WO 35751 a, Fag Pi Tactan th ohFyodv, CHESER WO 35751 WO 35751 Ai * 8p PI 5g ws rs Ed EE WO 35751 WO 35751 WO 35751
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202063064651P | 2020-08-12 | 2020-08-12 | |
| PCT/US2021/045199 WO2022035751A1 (en) | 2020-08-12 | 2021-08-09 | Stormwater treatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ796762A NZ796762A (en) | 2024-08-30 |
| NZ796762B2 true NZ796762B2 (en) | 2024-12-03 |
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