WO1995031407B1 - Method and apparatus for water treatment - Google Patents
Method and apparatus for water treatmentInfo
- Publication number
- WO1995031407B1 WO1995031407B1 PCT/US1995/006029 US9506029W WO9531407B1 WO 1995031407 B1 WO1995031407 B1 WO 1995031407B1 US 9506029 W US9506029 W US 9506029W WO 9531407 B1 WO9531407 B1 WO 9531407B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- chamber
- ozone
- outlet
- vessel
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract 110
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract 72
- 238000000034 method Methods 0.000 claims abstract 7
- 238000002347 injection Methods 0.000 claims abstract 5
- 239000007924 injection Substances 0.000 claims abstract 5
- 238000001816 cooling Methods 0.000 claims 15
- 239000000356 contaminant Substances 0.000 claims 12
- 230000001112 coagulant Effects 0.000 claims 8
- 239000000701 coagulant Substances 0.000 claims 8
- 239000007787 solid Substances 0.000 claims 7
- 239000000126 substance Substances 0.000 claims 7
- 239000000203 mixture Substances 0.000 claims 5
- 239000011236 particulate material Substances 0.000 claims 5
- 238000000926 separation method Methods 0.000 claims 5
- 238000004140 cleaning Methods 0.000 claims 4
- 230000005484 gravity Effects 0.000 claims 3
- 238000011144 upstream manufacturing Methods 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract 2
- 230000003068 static Effects 0.000 abstract 1
Abstract
An apparatus for treating water includes a vertically extending contact vessel (60), wherein water is contacted with ozone (53), and a return vessel (61) which contains a column (24) of water of a sufficient height to drive water through downstream filtering stages (12). Ozone is removed from the water and the rate of ozone injection is monitored and automatically adjusted so that no great amount of ozone remains in water entering the filtering stages (12). The ozone is generated in elongated elements (58) that are cooled by the process water and that are positioned to serve as a static mixer for such water.
Claims
1. An apparatus for treating water which contains contaminants, the apparatus comprising:
a first chamber having a water inlet and outlet;
a second chamber having a water inlet and outlet, the second chamber being downstream of the first chamber and in communication therewith such that water is permitted to flow from the outlet of the first chamber to the inlet of the second chamber;
an ozone generator system for combining ozone with water such that ozone is contained in water inside at least one of the chambers, the ozone generator system comprising plural elongated ozone production elements, at least some of the elements being disposed in one of the chambers; and
a solids separation system positioned to receive water from the outlet of the second chamber.
2. The apparatus according to claim 1 wherein:
the first chamber is defined by a contact tower; and the second chamber is defined by a return tower.
3. The apparatus according to claim 1 wherein:
the chambers are arranged so that water is permitted to flow upwardly through the first chamber; and
the apparatus further comprises an ozone inlet positioned so that ozone injected through the inlet is mixed with the water in the first chamber.
4. The apparatus according to claim 1 wherein:
the second chamber comprises a reservoir region and a cooling region which is downstream of the reservoir region; and
the ozone generator system comprises a plurality of ozone generation elements, at least some of the elements being disposed within the cooling region.
5. The apparatus according to claim 1 wherein the solids separation system comprises an upflow clarifier device wherein water flows upwardly through a bed of particuiate media.
6. The apparatus according to claim 5 wherein the solids separation system further comprises a downflow filter downstream of the clarifier device.
7. An apparatus for the treatment of water which contains contaminants, the apparatus comprising:
a vessel having a water inlet and a water outlet; and
an ozone generator system comprising plural ozone generation elements, at least some of the elements being disposed in the vessel so that water in the vessel cools the elements.
8. The apparatus according to claim 7 further comprising a divider that is disposed in the vessel between the inlet and outlet to divide the vessel into a contact tower and a return tower, the contact tower being adjacent: to the inlet and the return tower being adjacent to the outlet such that the water is permitted to flow in through the inlet, over the divider, and out through the outlet.
9 . The apparatus according to claim 8 wherein the contact tower has an ozone inlet for admitting ozone from the ozone generator system.
10. The apparatus according to claim 9 wherein the divider has a top portion with a weir at the top portion to permit water to flow from the contact tower, over the weir, and into the return tower.
11. The apparatus according to claim 10 wherein at least some of the ozone generation elements are disposed in the return tower.
12. The apparatus according to claim 10 wherein the apparatus further comprises a filter system downstream of the vessel, the filter system comprising at least one bed of particulate material .
13. The apparatus according to claim 12 wherein the weir is positioned at a level above the top of the bed.
14. An apparatus for treating water which contains contaminants, the apparatus comprising:
a gas contactor vessel that defines an inlet for water to be treated, an outlet for treated water, and a gas collection chamber to contain a volume of gas above water inside the vessel;
an ozone injection system including a gas diffuser positioned to inject ozone gas into water such that ozone is contained in water that is inside the vessel; and
a gas collector operable to maintain the volume of gas contained in the gas collection chamber at a subatmospheric pressure to separate ozone from the water before the water flows from the vessel through the outlet.
15. An apparatus for treating water which contains contaminants, the apparatus comprising:
an ozone generator system adapted to inject ozone into water inside the apparatus, the system comprising plural ozone generation elements;
a cooling vessel having a cooling vessel inlet for water to be treated and a cooling vessel outlet, at least some of the ozone generation elements being disposed in the cooling vessel so that the elements are cooled by water passing through the vessel; and
a solids separation system operatively connected to the cooling vessel outlet to receive heated water from the vessel.
16. An apparatus for treating water which contains contaminants, the apparatus comprising:
a first chamber having a process flow inlet and a weir at a location above the inlet, the inlet and the weir being positioned to permit an upward flow of water through the chamber;
a second chamber downstream of and joined to the first chamber in such a manner that water enters the second chamber by flowing over the weir, the second chamber having an outlet positioned below the weir to permit a downward flow of water through the second chamber;
a gas collection chamber positioned to contain a volume of gas above the water in at least one of the first and second chambers;
a gas diffuεer positioned to inject ozone into water such that ozone is contained in water that is inside at least one of the chambers;
an ozone generator system adapted to supply ozone to the diffuser; and
a gas collector operable to maintain the volume of gas contained in the gas collection chamber at a subatmospheric pressure and to remove gas from the gas collection chamber.
17. An apparatus for treating water which contains contaminants, the apparatus comprising:
an ozone generator system comprising plural ozone generation elements;
a mixing vessel having a mixing vessel inlet for water to be treated and a mixing vessel outlet, at least some of the elements being disposed in an array inside the mixing vessel;
a coagulant injection system for injecting coagulant chemicals into the water upstream of the array of elements so that mixing of the chemicals with the water is enhanced by agitation that results as the water passes through the array of elements; and a solids separation system operatively connected to the mixing vessel outlet to receive coagulant-containing water from the vessel.
18. An apparatus for treating water which contains contaminants, the apparatus comprising:
a first chamber having a process flow inlet and a weir at a location above the inlet, the inlet and the weir being positioned to permit an upward flow of water in a column through the chamber;
a second chamber downstream of and joined to the first chamber in such a manner that water enters the second chamber by flowing over the weir, the second chamber having an outlet positioned below the weir to permit a downward flow of water in a column through the second chamber; and
a filter that (a) comprises a bed of particulate material having an upper surface, (b) is connected to the outlet of the second chamber to receive water from the second chamber, and (c) is positioned so that the upper surface of the bed is at an elevation below the elevation of the weir.
19. An apparatus for treating water which contains contaminants, the apparatus comprising:
a first chamber having a process flow inlet and a weir at a location above the inlet, the inlet and the weir being positioned to permit an upward flow of water through the chamber;
a gas diffuser positioned to inject ozone into water inside the first chamber;
an ozone generator system adapted to supply ozone to the diffuser, the system comprising plural ozone generation tubes;
a second chamber downstream of and joined to the first chamber in such a manner that water enters the second chamber by flowing over the weir, the second chamber having an outlet positioned below the weir to permit a downward flow of water through the second chamber, and the chambers defining a gas collection chamber above the weir;
a gas collector operable to remove gas from the gas collection chamber;
an ozone detector which signals when the ozone content of the water exceeds a predetermined limit;
a gas supply controller which responds to a signal from the ozone detector to reduce the rate of ozone injection through the diffuser when the ozone content exceeds the predetermined limit;
a level sensor adapted to signal when the level of the water in the second chamber exceeds a predetermined height limit;
a cooling vessel having (a) a cooling vessel inlet that communicates with the outlet of the second chamber so that water being treated flows from the second chamber and into the cooling vessel, and (b) a cooling vessel outlet, at least some of the ozone generation tubes being disposed in the cooling vessel where the tubes are cooled by water passing through the vessel, the ozone generation tubes inside the vessel being positioned in an array such that water is agitated as it passes through the array;
a coagulant injection system for injecting coagulant chemicals into the water upstream of the ozone
generation tubes so that mixing of the chemicals with the water is enhanced by agitation that results as the water passes through the array of tubes;
an upflow clarifier device operatively connected to the cooling vessel outlet to receive water from the cooling vessel, the clarifier device having an outlet that is located below the level of the weir;
a downflow filter positioned downstream of the upflow clarifier device and operatively connected to the outlet of the upflow clarifier device to receive clarified water from the device; and
a cleaning mechanism that responds to a signal from the level sensor to initiate cleaning of at least one of the clarifier device and the filter when the
predetermined height is exceeded.
20. A method of treating a continuous flow of water which contains contaminants, the method comprising:
directing the flow of water to pass through a gas contactor vessel;
injecting ozone into the passing flow of water in the vessel in such a manner that the ozone mixes with the water;
separating ozone from the resulting mixture of water and ozone;
after the separating, measuring the amount of ozone in the ozone-depleted water to determine whether the amount of ozone remaining exceeds a predetermined amount;
reducing the amount of ozone being injected if the amount of ozone remaining exceeds the predetermined amount; and
passing the mixture of ozone-depleted water through a filter system.
21. A method of treating a continuous flow of water which contains contaminants, the method comprising:
directing the flow of water to pass upwardly through a first chamber having a process flow inlet and an outlet comprising a weir located above the inlet;
directing the water that flows over the weir to pass downwardly by gravity through a return second chamber having an outlet located below the weir;
passing water from the second chamber outlet to and upwardly through a bed of particulate material to filter solids from the water;
sensing a condition of water in the second chamber to determine when the level of the water in the second chamber exceeds a predetermined height; and
cleaning the bed when the level of the water exceeds the predetermined height.
22. A method of treating a continuous flow of water which contains contaminants, the method comprising:
directing the flow of water to pass upwardly through a first chamber having a process flow inlet and an outlet comprising a weir located above the inlet;
operating an ozone generator, which comprises plural ozone generation elements, to produce ozone;
injecting the ozone into the upwardly passing flow of water in such a manner that the ozone mixes with the water;
passing the resulting mixture of water and ozone into contact with a volume of gas maintained at a subatmospheric pressure above the water so that ozone is removed from the water;
directing the ozone-depleted water to pass
downwardly by gravity through a second chamber having an outlet located below the weir;
measuring to determine whether the amount of ozone remaining in water downstream of the first chamber exceeds a predetermined amount;
reducing the amount of ozone being generated if the amount of ozone remaining exceeds the predetermined amount;
cooling the ozone generator by contacting an array of the ozone generation elements with the water being treated;
adding coagulant chemicals to the water upstream of the array of ozone generation elements so that the mixture of water and coagulant chemicals is agitated as it passes through the array of elements;
passing the agitated mixture of ozone-depleted water and coagulant chemicals through a bed of particulate material to separate solids from the water;
sensing a condition of water in the second chamber to determine when the level of the water in the second chamber exceeds a predetermined height; and
cleaning the bed when it is sensed that the level of the water exceeds the predetermined height.
23. An apparatus for treating water which contains contaminants, the apparatus comprising:
a first chamber having (a) a process flow inlet and (b) an outlet at a location above the inlet, the inlet and the outlet being positioned to permit an upward flow of water in a column through the chamber;
a second chamber downstream of and joined to the first chamber in such a manner that water flows by gravity from the first chamber into the second chamber via the first chamber outlet, the second chamber having an outlet positioned below the first chamber outlet to permit a downward flow of water in a column through the second chamber; and
a filter that (a) comprises vessel containing a bed of particulate material and a body of water having an upper surface, (b) is connected to the outlet of the second chamber to receive water from the second chamber, and (c) is positioned so that the first chamber outlet is at an elevation that is above the elevation of the upper surface of the water in the vessel.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT95919186T ATE222218T1 (en) | 1994-05-12 | 1995-05-12 | METHOD AND DEVICE FOR TREATING WATER |
| NZ285667A NZ285667A (en) | 1994-05-12 | 1995-05-12 | Ozone water treatment and solids separation apparatus |
| DE69527784T DE69527784D1 (en) | 1994-05-12 | 1995-05-12 | METHOD AND DEVICE FOR TREATING WATER |
| EP95919186A EP0759891B1 (en) | 1994-05-12 | 1995-05-12 | Method and apparatus for water treatment |
| AU25146/95A AU2514695A (en) | 1994-05-12 | 1995-05-12 | Method and apparatus for water treatment |
| CA002189757A CA2189757C (en) | 1994-05-12 | 1995-05-12 | Method and apparatus for water treatment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US241,657 | 1994-05-12 | ||
| US08/241,657 US5514284A (en) | 1994-05-12 | 1994-05-12 | Method and apparatus for water treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1995031407A1 WO1995031407A1 (en) | 1995-11-23 |
| WO1995031407B1 true WO1995031407B1 (en) | 1995-12-14 |
Family
ID=22911633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/006029 WO1995031407A1 (en) | 1994-05-12 | 1995-05-12 | Method and apparatus for water treatment |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US5514284A (en) |
| EP (1) | EP0759891B1 (en) |
| AT (1) | ATE222218T1 (en) |
| AU (1) | AU2514695A (en) |
| DE (1) | DE69527784D1 (en) |
| NZ (1) | NZ285667A (en) |
| TW (1) | TW254915B (en) |
| WO (1) | WO1995031407A1 (en) |
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-
1994
- 1994-05-12 US US08/241,657 patent/US5514284A/en not_active Expired - Lifetime
- 1994-05-20 TW TW083104590A patent/TW254915B/en active
-
1995
- 1995-05-12 WO PCT/US1995/006029 patent/WO1995031407A1/en active IP Right Grant
- 1995-05-12 NZ NZ285667A patent/NZ285667A/en unknown
- 1995-05-12 DE DE69527784T patent/DE69527784D1/en not_active Expired - Lifetime
- 1995-05-12 AT AT95919186T patent/ATE222218T1/en not_active IP Right Cessation
- 1995-05-12 EP EP95919186A patent/EP0759891B1/en not_active Expired - Lifetime
- 1995-05-12 AU AU25146/95A patent/AU2514695A/en not_active Abandoned
-
1996
- 1996-05-07 US US08/716,704 patent/US5766488A/en not_active Expired - Lifetime
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