GB1595068A - Treatment of sewage in a sewer - Google Patents
Treatment of sewage in a sewer Download PDFInfo
- Publication number
- GB1595068A GB1595068A GB10540/77A GB1054077A GB1595068A GB 1595068 A GB1595068 A GB 1595068A GB 10540/77 A GB10540/77 A GB 10540/77A GB 1054077 A GB1054077 A GB 1054077A GB 1595068 A GB1595068 A GB 1595068A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sewage
- gas
- oxygen
- valve
- sewer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000010865 sewage Substances 0.000 title claims description 74
- 239000007789 gas Substances 0.000 claims description 67
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 40
- 239000001301 oxygen Substances 0.000 claims description 40
- 229910052760 oxygen Inorganic materials 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 22
- 238000010992 reflux Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 11
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000012466 permeate Substances 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2307/00—Location of water treatment or water treatment device
- C02F2307/08—Treatment of wastewater in the sewer, e.g. to reduce grease, odour
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Accessories For Mixers (AREA)
Description
(54) TREATMENT OF SEWAGE IN A SEWER
(71) We, BOC INTERNATIONAL LI
MITED, of Hammersmith House, London
W6 9DX, England, an English company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to the treatment of sewage in a sewer and is an improvement in, or modification of, the invention disclosed in our United Kingdom patent specification
No 1 452 961.
It is proposed in the above numbered specification to treat sewage in a sewer by injecting oxygen-rich gas under pressure into the sewer system. More specifically, the gas is injected through a pipe (having orifices therein) into the sewage flowing through the sewer, into the volute of a pump for driving sewage through a rising main sewer or into a sump in which the sewage is contained prior to its being pumped through the sewer.
The present invention resides in a method of treating sewage in a sewer wherein oxygen-rich gas is injected into the sewage through part of a reflux valve provided in the sewer, or at a location in the vicinity of such a valve where turbulence exists in the sewage by virtue of the flow of sewage through the valve.
By injecting the gas into a region of turbulence in the sewage the gas is readily broken up into a fine bubble form and mixed with the sewage, facilitating dissolution of the gas in the sewage.
The invention also resides in apparatus for treating sewage in a sewer comprising means for injecting oxygen-rich gas into the sewage through part of a reflux valve for location in the sewer or through means for location in the vicinity of such a valve whereat, in use, turbulence exists in the sewage by virtue of the flow of sewage through the valve.
The invention furthermore resides in a sewer provided with such apparatus.
The term "oxygen-rich gas" is used herein to mean oxygen or a gaseous mixture having a proportion of oxygen higher than that of air, preferably greater than 95% oxygen.
The gas may be injected into the sewage through a gas-permeable portion of the valve housing or of the wall of the sewer.
Alternatively, the valve may have a hollow valve member to define a chamber which is supplied with pressurised air or oxygen rich gas, a portion of the wall of such chamber being gas permeable to allow the gas to permeate through into the sewage flowing over the valve member. In any case, the gas-permeable portion may be provided by an element of porous or perforate material.
Preferred porous materials are non-ferrous sintered materials such as copper or bronze which have the advantage that bacterial slime tends not to adhere to them and clog their pores.
The pores or holes of any such element preferably have greatest transverse dimensions of 0.010 inch or less. It is also preferred that each such pore or hole is spaced from its neighbours by a distance substantially greater than the aforesaid transverse dimension, and most preferably by a distance of at least 0.030 inch, e.g.
0.060 inch or more, to minimise the likelihood of coalescence of bubbles of gas emerging from the pores or holes.
When the gas is substantially pure oxygen it is conveniently supplied to the sewage from a reservoir of liquid oxygen contained in a vacuum insulated evaporator, the liquid being evaporated by heat exchange with the ambient atmosphere.
In some methods according to the invention the concentration of dissolved oxygen in the sewage or the biochemical oxygen demand of the sewage may be monitored downstream of the point of gas injection, and the rate of gas injection adjusted in accordance with changes in the monitored value. Such adjustment may take place automatically using a control system, e.g. an analogue or digital computer, which receives signals from a dissolved oxygen meter and emits signals to actuate means for controlling the rate of flow of gas.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic representation of apparatus for injecting an oxygen-rich gas into sewage in a rising main sewer;
Figure 2 is a schematic sectional view of the reflux valve of Figure 1; and
Figure 3 is a schematic sectional view of a modified form of reflux valve.
Referring to Figure 1, there is shown a rising main sewer 10 leading from a pumping station 11. A sewage inlet 12 is provided to pass sewage to a sump 13. A pump 14 draws the sewage from the sump, pressurises the sewage and delivers it into the sewer conduit 10. A reflux valve 15 is provided in conduit 10 near pump 14 to prevent backflow of sewage into the pump.
Oxygen-rich gas is supplied under pressure through a line 17 and passes to a chamber 30 (Figure 2) adjoining the housing 31 of the reflux valve 15. The housing 31 has a porous plate 32 made of sintered bronze set into its wall which plate also defines part of the boundary of chamber 30. Oxygen-rich gas from the chamber permeates through the plate 32 and enters the sewage flowing through the valve in a fine bubble form. As the reflux valve acts as a constriction in the sewage flow, there is high velocity and a swirling motion created in the sewage. Such enforced turbulence assists in dissolving the gas in the sewage by breaking up the fine gas bubbles into even finer bubbles.
The gas, when substantially pure oxygen, is conveniently contained in liquid form in a conventional vacuum insulated evaporator (not shown) whereby the liquid is evaporated by heat exchange with the ambient atmosphere to provide a pressurised supply of gas to line 17.
The flow of gas is controlled by a solenoid operated valve 18 which is operated automatically to adjust the rate of flow through line 17 in accordance with variations in the value of the concentration of dissolved oxygen measured at the outfall 19 of the rising main by a dissolved oxygen meter 20.
In a typical example of a process according to the invention using apparatus of the type described above, sewage is pumped along the conduit 10 at a flow rate of 1 mgd and at a pressure of 3 atmospheres while substantially pure oxygen is supplied to the chamber 30 at a pressure of 5 atmospheres.
Oxygen in fine bubble form enters the sewage through porous plate 32 at a rate such that the dissolved oxygen content of sewage downstream of the oxygen injection point is of the order of 100 ppm.
Figure 3 illustrates a modified form of reflux valve for use with the apparatus of
Figure 1. In this case the pivotted valve member 35 is hollow to define a chamber 41 which is fed with oxygen-rich gas via a passage provided through the hinge 42.
Porous plates 40 are set into the walls of the valve member through which the gas permeates to emerge in fine bubble form into the turbulent flow of sewage passing through the valve.
WHAT WE CLAIM IS:
1. A method of treating sewage in a sewer wherein oxygen-rich gas is injected into the sewage through part of a reflux valve provided in the sewer, or at a location in the vicinity of such a valve whereat turbulence exists in the sewage by virtue of the flow of sewage through the valve.
2. A method according to claim 1 wherein the gas is injected through a gas permeable portion of the valve housing or-of the wall of the sewer.
3. A method according to claim 1 wherein the gas is injected through a gas permeable portion of a movable valve member.
4. A method according to claim 2 or claim 3 wherein said gas permeable portion is provided by an element of porous or perforate material.
5. A method according to claim 4 wherein the pores or holes of said element have greatest transverse dimensions of 0.010 inch or less.
6. A method according to claim 4 or claim 5 wherein the pores or holes of said element are spaced apart by distances substantially greater than the greatest. transverse dimensions thereof.
7. A method according to any preceding claim wherein the gas is supplied to the sewage from a reservoir of liquid oxygen.
8. A method according to any preceding claim wherein the dissolved oxygen concentration or biochemical oxygen demand of the sewage is monitored downstream of the point of gas injection and the rate of gas injection is controlled in accordance with changes in the monitored value.
9. Apparatus for treating sewage in a sewer comprising means for injecting oxygen-rich gas into the sewage through part of a reflux valve for location in the sewer or through means for location in the. vicinity of such a valve whereat, in use, turbulence exists in the sewage by virtue of the flow of sewage through the valve.
10. Apparatus according to claim 9
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (19)
1. A method of treating sewage in a sewer wherein oxygen-rich gas is injected into the sewage through part of a reflux valve provided in the sewer, or at a location in the vicinity of such a valve whereat turbulence exists in the sewage by virtue of the flow of sewage through the valve.
2. A method according to claim 1 wherein the gas is injected through a gas permeable portion of the valve housing or-of the wall of the sewer.
3. A method according to claim 1 wherein the gas is injected through a gas permeable portion of a movable valve member.
4. A method according to claim 2 or claim 3 wherein said gas permeable portion is provided by an element of porous or perforate material.
5. A method according to claim 4 wherein the pores or holes of said element have greatest transverse dimensions of 0.010 inch or less.
6. A method according to claim 4 or claim 5 wherein the pores or holes of said element are spaced apart by distances substantially greater than the greatest. transverse dimensions thereof.
7. A method according to any preceding claim wherein the gas is supplied to the sewage from a reservoir of liquid oxygen.
8. A method according to any preceding claim wherein the dissolved oxygen concentration or biochemical oxygen demand of the sewage is monitored downstream of the point of gas injection and the rate of gas injection is controlled in accordance with changes in the monitored value.
9. Apparatus for treating sewage in a sewer comprising means for injecting oxygen-rich gas into the sewage through part of a reflux valve for location in the sewer or through means for location in the. vicinity of such a valve whereat, in use, turbulence exists in the sewage by virtue of the flow of sewage through the valve.
10. Apparatus according to claim 9
wherein the gas can be injected through a gas permeable portion of the valve housing or of the wall of the sewer.
11. Apparatus according to claim 9 wherein the gas can be injected through a gas permeable portion of a movable valve member.
12. Apparatus according to claim 10 or claim 11 wherein said gas permeable portion is provided by an element of porous or perforate material.
13. Apparatus according to claim 12 wherein the pores or holes of said element have greatest transverse dimensions of 0.010 inch or less.
14. Apparatus according to claim 12 or claim 13 wherein the pores or holes of said element are spaced apart by distances substantially greater than the greatest transverse dimensions thereof.
15. Apparatus according to any one of claims 9 to 12 comprising a gas supply in the form of a reservoir of liquid oxygen.
16. Apparatus according to any one of claims 9 to 15 comprising means for monitoring the dissolved oxygen concentration or biochemical oxygen demand of sewage at a selected point in the sewer and means for controlling the rate of gas injection in accordance with changes in the monitored value.
17. A sewer provided with apparatus according to any one of claims 9 to 16.
18. A method of treating sewage substantially as hereinbefore described with reference to the accompanying drawings.
19. Apparatus for treating sewage substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB10540/77A GB1595068A (en) | 1977-03-11 | 1977-03-11 | Treatment of sewage in a sewer |
| AU34078/78A AU520567B2 (en) | 1977-03-11 | 1978-03-10 | Sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB10540/77A GB1595068A (en) | 1977-03-11 | 1977-03-11 | Treatment of sewage in a sewer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1595068A true GB1595068A (en) | 1981-08-05 |
Family
ID=9969709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10540/77A Expired GB1595068A (en) | 1977-03-11 | 1977-03-11 | Treatment of sewage in a sewer |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU520567B2 (en) |
| GB (1) | GB1595068A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2590246A1 (en) * | 1985-11-20 | 1987-05-22 | Screg Routes & Travaux | Device for the oxygenation of lagoon treatment effluents |
-
1977
- 1977-03-11 GB GB10540/77A patent/GB1595068A/en not_active Expired
-
1978
- 1978-03-10 AU AU34078/78A patent/AU520567B2/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2590246A1 (en) * | 1985-11-20 | 1987-05-22 | Screg Routes & Travaux | Device for the oxygenation of lagoon treatment effluents |
Also Published As
| Publication number | Publication date |
|---|---|
| AU520567B2 (en) | 1982-02-11 |
| AU3407878A (en) | 1979-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed |