CA2043316A1 - Water treatment system - Google Patents
Water treatment systemInfo
- Publication number
- CA2043316A1 CA2043316A1 CA 2043316 CA2043316A CA2043316A1 CA 2043316 A1 CA2043316 A1 CA 2043316A1 CA 2043316 CA2043316 CA 2043316 CA 2043316 A CA2043316 A CA 2043316A CA 2043316 A1 CA2043316 A1 CA 2043316A1
- Authority
- CA
- Canada
- Prior art keywords
- line
- inlet line
- filter means
- filters
- pressure
- 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.)
- Abandoned
Links
Landscapes
- Filtration Of Liquid (AREA)
Abstract
CANADA
Water Treatment System Del R. Armitage ABSTRACT OF THE DISCLOSURE
A processing system for raw water uses a plurality of filters in series and/or tandem to filter water. When pressure in the filters exceeds a predetermined level, backwashing water, air and/or solvent cleans the filters. The filters are located between a raw water line and a processed water line. Cleaning water may come from the processed water line, or from a separate source.
Water Treatment System Del R. Armitage ABSTRACT OF THE DISCLOSURE
A processing system for raw water uses a plurality of filters in series and/or tandem to filter water. When pressure in the filters exceeds a predetermined level, backwashing water, air and/or solvent cleans the filters. The filters are located between a raw water line and a processed water line. Cleaning water may come from the processed water line, or from a separate source.
Description
2 v 1 3 ~ ~
FIELD OF THE INVENTION
This invention relates to waste water treatment systems, and particularly treatment systems used in secondary recovery systems in oil fields.
BACXGROUND ~ND ~UMMARY OF THE INVENTION
Water used in secondary recoverv systems must be filtered before being used. The water is typically obtained from creeks, rivers, ponds, lakes, settling ponds, and shallow or deep wells, in all of which the water quality is highly variable. Existing systems known to the inventor use cloth filters that need frequent replacement. The inventor has provided an automated system that eliminates the need for cloth filters and provides, in one aspect, a processing system for raw water comprisin~:
an inlet line for connection to a raw water manifold;
a first remotely operable normally open valve on the inlet line;
pressure sensor means on the inlet line for sensing the pressure on the inlet line and producing signals indicative of the pressure on the inlet line;
filter means attached to the inlet line downstream of the first remotely operable valve and downstream of the pressure sensor for filtering fine particles from the raw water;
an outlet line attached to the filter means for connection to a processed water manifold;
a second remotely operable normally open valve on the outlet line;
a first waste disposal line in fluid connection with the inlet line between the filter means and the first remotely operable valve, the waste disposal line :, .
~ ~ ,j C,~
including a check valve and a third remotely operable normally closed valve;
a first backflow injection line in fluid connection with the outlet line between the second remotely operable valve and the filter means;
a fourth remotely operable normally closed valve on the backflow injection line;
control means responsive to signals from the pressure sensor for controlling the first, second and third remotely operable valves.
Further summary of the invention is to be found in the claims.
BRIEF DESCRIPTION OF THE D~AWINGS
There will now be described a pre~erred embodiment of the invention, with reference to the drawing, by way of illustration only, in which like numerals denote like elements and in which:
Figure 1 is a flow diagram of a treatment system according to the invention; and Figure 2 is a schematic of a control system for the treatment system of Figure 1.
DETAILED DESCRIP~ION OF PR~ERRED E~BO~IME~TS
Referring to the Figures, raw water intake manifold 10 is connected to inlet line 12. Both are for example 6" tubular steel water lines. The inlet line 12 includes a first remotely operable normally open valve 14, and has attached to it a pressure sensor 16 for sensing the pressure on the inlet line 12. The pressure sensor 16 produces signals indicative of the pressure on the inlet line 12, and is connected to control unit 20. The control unit 20 may be for example an SLC 500 Programmable Controller, available , . .
' ' from Allen-Bradley, a division of Rockwell International of Milwaukee, Wisconsin, USA.
A plurality of micro-screen filters 22 or other filter means of equivalent function are attached to the inlet line downstream of the first remotely operable valve 14 and downstream of the pressure sensor 16 for filtering fine particles from the raw water. Each filter 22 is preferably an aluminum filter 9~" x 9~" x 5~", port size 1 5/16", with a flow rate of 40 gallons per minute, and flow pressure of 80 psi, available from Oberg ~nterprises Inc. of Everett, Washington, USA. The filters must be backwashable, and preferably have a stainless steel dutch weave microscreen, the mesh size being dependent on the nature of the water being processed. The filters shown are shown with two sets of filters in tandem and each set consisting of two filters in parallel, although, again, the actual configuration chosen, as with the filter size, will be dependent on the nature of the water to be processed. Relatively clean water may require only 2 single filters in series, with one 35 micron screen and one 25 micron screen. On the other hand, relatively dirty water may require 3 series of filters, with one 45 micron screen, one 35 micron screen and one 25 micron screen. With such a series of filters, solids build up is expected to be more even between filters. Tandem filtering also eliminates duplication of pneumatic valves.
An outlet line 24 connects the filters 22 to a processed water manifold 26 through a second remotely operable normally open valve 28 on the outlet line.
A first waste disposal line 32 is in fluid connection with the inlet line 12 between the filters : . ~ ; .: :- ..
: ~ ,-. . :, .~, -- ~ , . . :: .
:
.
':`' ' 22 and the first remotely operable valve 14. The waste disposal line 32 includes a check valve 34. Flow on the disposal line 32 is controlled by remotely operable valve 50 through control unit 20.
A first backflow injection line 36 is in fluid connection with the outlet line 24 between the second remotely operable valve 28 and the filters 22. The back flow injection line 36 may be connected to a source of solvent or air (not shown) through line 40 or to the processed water manifold 26 through line 42.
Flow in the back flow injection line 36 is controlled by one or both of two remotely operable normally closed valves 44 and 46 in fluid connection with the backflow injection line. The valves 44 and 46 are controlled by the control unit 20. The remotely operated valves are preferably pneumatic stainless steel ball valves, with spring return pneumatic actuators.
Control unit 20 is responsive to signals from the pressure sensor 16 for controlling each of the remotely operable valves 12, 28, 44, 46, and 50.
In the embodiment shown, the filters are arranged with two parallel pairs in series with a connecting line 54 between them. Flow on the connecting line is controlled during backwashing, to be explained later, by check valve 60. A second back flow injection line 38 is connected to the first back flow injection line 36 for delivery of backwashîng fluid to the first pair of filters. The first back flow injection line 36 feeds backwashing fluid to the second pair of filters. The back flow injection lines include a pair of check valves 62 and 64 to prevent reverse flow of water in them during normal filter operations. For disposal of waste water during : : , ~' ~ ' , "
J ~
backwashing from the second pair of filters 22, second waste water disposal line 56 runs out to waste disposal through check valve 66.
The operation of the invention is as follows.
Normally, raw water is processed by filtering the raw water as it passes through the filters 22 from the inlet line and on out to the processed water line.
Pressure drop from the raw water line to the processed water line is typically 15 - 20 psi. Valves 44, 46 and 50 are normally closed, while valves 14 and 28 are normally open. While the water is passing through the filters, the pressure in the inlet line is monitored by pressure sensor 16 and control unit 20. When the pressure drops below a predetermined level, due normally to contamination of the filter screens, valves 14 and 28 are first closed and then valves 46 and 50 are opened by the control unit 20. Backwashing water will then be pressured through all of the filters in reverse, and out through the waste disposal lines carrying solids in the filter screens with the waste water. Air or possibly solvent, may also be injected into the filters 22 in reverse and out through the waste disposal lines 32 and 56 by opening valve 44 and activating an air or solvent supply (not shown).
In normal operation, the system will go repetitively through numerous cycles of backwashing.
Cycle time will vary depending on the quality of the raw water. In this manner, the filters are kept free of contamination without the replacement of the filters. If continuous flow of treated water is required, a second similar series of filters in parallel may be set up and controlled by the same , :
.
control unit so that only one set will be washed out at any one time.
In one embodiment of the method, valves 14, 28 and 46 may be closed, and air at a pressure of 80 -100 psi may be injected into the filters to loosen particles. This may last for 2 seconds, and then the valve 44 may be closed and processed water allowed to flow into -the filters through valve 46.
The cleaning water may also come from a separate supply, not shown, but is preferably from the processed water line.
The solids from the filters during backwashing may be taken out to a holding tank or settling pond.
Manually operated valves 70, located on the inlet line, outlet line, the air supply line and the backwash supply line as shown, allow the system to be isolated for complete servicing.
Alternative Embodiments A person skilled in the art could make immaterial modifications to the invention described and claimed in this patent without departing from the essence of the invention.
FIELD OF THE INVENTION
This invention relates to waste water treatment systems, and particularly treatment systems used in secondary recovery systems in oil fields.
BACXGROUND ~ND ~UMMARY OF THE INVENTION
Water used in secondary recoverv systems must be filtered before being used. The water is typically obtained from creeks, rivers, ponds, lakes, settling ponds, and shallow or deep wells, in all of which the water quality is highly variable. Existing systems known to the inventor use cloth filters that need frequent replacement. The inventor has provided an automated system that eliminates the need for cloth filters and provides, in one aspect, a processing system for raw water comprisin~:
an inlet line for connection to a raw water manifold;
a first remotely operable normally open valve on the inlet line;
pressure sensor means on the inlet line for sensing the pressure on the inlet line and producing signals indicative of the pressure on the inlet line;
filter means attached to the inlet line downstream of the first remotely operable valve and downstream of the pressure sensor for filtering fine particles from the raw water;
an outlet line attached to the filter means for connection to a processed water manifold;
a second remotely operable normally open valve on the outlet line;
a first waste disposal line in fluid connection with the inlet line between the filter means and the first remotely operable valve, the waste disposal line :, .
~ ~ ,j C,~
including a check valve and a third remotely operable normally closed valve;
a first backflow injection line in fluid connection with the outlet line between the second remotely operable valve and the filter means;
a fourth remotely operable normally closed valve on the backflow injection line;
control means responsive to signals from the pressure sensor for controlling the first, second and third remotely operable valves.
Further summary of the invention is to be found in the claims.
BRIEF DESCRIPTION OF THE D~AWINGS
There will now be described a pre~erred embodiment of the invention, with reference to the drawing, by way of illustration only, in which like numerals denote like elements and in which:
Figure 1 is a flow diagram of a treatment system according to the invention; and Figure 2 is a schematic of a control system for the treatment system of Figure 1.
DETAILED DESCRIP~ION OF PR~ERRED E~BO~IME~TS
Referring to the Figures, raw water intake manifold 10 is connected to inlet line 12. Both are for example 6" tubular steel water lines. The inlet line 12 includes a first remotely operable normally open valve 14, and has attached to it a pressure sensor 16 for sensing the pressure on the inlet line 12. The pressure sensor 16 produces signals indicative of the pressure on the inlet line 12, and is connected to control unit 20. The control unit 20 may be for example an SLC 500 Programmable Controller, available , . .
' ' from Allen-Bradley, a division of Rockwell International of Milwaukee, Wisconsin, USA.
A plurality of micro-screen filters 22 or other filter means of equivalent function are attached to the inlet line downstream of the first remotely operable valve 14 and downstream of the pressure sensor 16 for filtering fine particles from the raw water. Each filter 22 is preferably an aluminum filter 9~" x 9~" x 5~", port size 1 5/16", with a flow rate of 40 gallons per minute, and flow pressure of 80 psi, available from Oberg ~nterprises Inc. of Everett, Washington, USA. The filters must be backwashable, and preferably have a stainless steel dutch weave microscreen, the mesh size being dependent on the nature of the water being processed. The filters shown are shown with two sets of filters in tandem and each set consisting of two filters in parallel, although, again, the actual configuration chosen, as with the filter size, will be dependent on the nature of the water to be processed. Relatively clean water may require only 2 single filters in series, with one 35 micron screen and one 25 micron screen. On the other hand, relatively dirty water may require 3 series of filters, with one 45 micron screen, one 35 micron screen and one 25 micron screen. With such a series of filters, solids build up is expected to be more even between filters. Tandem filtering also eliminates duplication of pneumatic valves.
An outlet line 24 connects the filters 22 to a processed water manifold 26 through a second remotely operable normally open valve 28 on the outlet line.
A first waste disposal line 32 is in fluid connection with the inlet line 12 between the filters : . ~ ; .: :- ..
: ~ ,-. . :, .~, -- ~ , . . :: .
:
.
':`' ' 22 and the first remotely operable valve 14. The waste disposal line 32 includes a check valve 34. Flow on the disposal line 32 is controlled by remotely operable valve 50 through control unit 20.
A first backflow injection line 36 is in fluid connection with the outlet line 24 between the second remotely operable valve 28 and the filters 22. The back flow injection line 36 may be connected to a source of solvent or air (not shown) through line 40 or to the processed water manifold 26 through line 42.
Flow in the back flow injection line 36 is controlled by one or both of two remotely operable normally closed valves 44 and 46 in fluid connection with the backflow injection line. The valves 44 and 46 are controlled by the control unit 20. The remotely operated valves are preferably pneumatic stainless steel ball valves, with spring return pneumatic actuators.
Control unit 20 is responsive to signals from the pressure sensor 16 for controlling each of the remotely operable valves 12, 28, 44, 46, and 50.
In the embodiment shown, the filters are arranged with two parallel pairs in series with a connecting line 54 between them. Flow on the connecting line is controlled during backwashing, to be explained later, by check valve 60. A second back flow injection line 38 is connected to the first back flow injection line 36 for delivery of backwashîng fluid to the first pair of filters. The first back flow injection line 36 feeds backwashing fluid to the second pair of filters. The back flow injection lines include a pair of check valves 62 and 64 to prevent reverse flow of water in them during normal filter operations. For disposal of waste water during : : , ~' ~ ' , "
J ~
backwashing from the second pair of filters 22, second waste water disposal line 56 runs out to waste disposal through check valve 66.
The operation of the invention is as follows.
Normally, raw water is processed by filtering the raw water as it passes through the filters 22 from the inlet line and on out to the processed water line.
Pressure drop from the raw water line to the processed water line is typically 15 - 20 psi. Valves 44, 46 and 50 are normally closed, while valves 14 and 28 are normally open. While the water is passing through the filters, the pressure in the inlet line is monitored by pressure sensor 16 and control unit 20. When the pressure drops below a predetermined level, due normally to contamination of the filter screens, valves 14 and 28 are first closed and then valves 46 and 50 are opened by the control unit 20. Backwashing water will then be pressured through all of the filters in reverse, and out through the waste disposal lines carrying solids in the filter screens with the waste water. Air or possibly solvent, may also be injected into the filters 22 in reverse and out through the waste disposal lines 32 and 56 by opening valve 44 and activating an air or solvent supply (not shown).
In normal operation, the system will go repetitively through numerous cycles of backwashing.
Cycle time will vary depending on the quality of the raw water. In this manner, the filters are kept free of contamination without the replacement of the filters. If continuous flow of treated water is required, a second similar series of filters in parallel may be set up and controlled by the same , :
.
control unit so that only one set will be washed out at any one time.
In one embodiment of the method, valves 14, 28 and 46 may be closed, and air at a pressure of 80 -100 psi may be injected into the filters to loosen particles. This may last for 2 seconds, and then the valve 44 may be closed and processed water allowed to flow into -the filters through valve 46.
The cleaning water may also come from a separate supply, not shown, but is preferably from the processed water line.
The solids from the filters during backwashing may be taken out to a holding tank or settling pond.
Manually operated valves 70, located on the inlet line, outlet line, the air supply line and the backwash supply line as shown, allow the system to be isolated for complete servicing.
Alternative Embodiments A person skilled in the art could make immaterial modifications to the invention described and claimed in this patent without departing from the essence of the invention.
Claims (9)
1. A processing system for raw water comprising:
an inlet line for connection to a raw water manifold;
a first remotely operable normally open valve on the inlet line;
pressure sensor means on the inlet line for sensing the pressure on the inlet line and producing signals indicative of the pressure on the inlet line;
filter means attached to the inlet line downstream of the first remotely operable valve and downstream of the pressure sensor for filtering fine particles from the raw water;
an outlet line attached to the filter means for connection to a processed water manifold;
a second remotely operable normally open valve on the outlet line;
a first waste disposal line in fluid connection with the inlet line between the filter means and the first remotely operable valve, the waste disposal line including a check valve and a third remotely operably normally closed valve;
a first backflow injection line in fluid connection with the outlet line between the second remotely operable valve and the filter means;
a fourth remotely operable normally closed valve on the backflow injection line;
control means responsive to signals from the pressure sensor for controlling the first, second and third remotely operable valves.
an inlet line for connection to a raw water manifold;
a first remotely operable normally open valve on the inlet line;
pressure sensor means on the inlet line for sensing the pressure on the inlet line and producing signals indicative of the pressure on the inlet line;
filter means attached to the inlet line downstream of the first remotely operable valve and downstream of the pressure sensor for filtering fine particles from the raw water;
an outlet line attached to the filter means for connection to a processed water manifold;
a second remotely operable normally open valve on the outlet line;
a first waste disposal line in fluid connection with the inlet line between the filter means and the first remotely operable valve, the waste disposal line including a check valve and a third remotely operably normally closed valve;
a first backflow injection line in fluid connection with the outlet line between the second remotely operable valve and the filter means;
a fourth remotely operable normally closed valve on the backflow injection line;
control means responsive to signals from the pressure sensor for controlling the first, second and third remotely operable valves.
2. The processing system of claim 1 in which the filter means includes a pair of microscreen filters in tandem.
3. The processing system of claim 1 in which the filter means includes:
a plurality of microscreen filters in series with a plurality of connecting lines between them;
a plurality of second waste disposal lines each in fluid connection with a respective one of the connecting lines, each of the second waste disposal lines including a check valve;
a plurality of second backflow injection lines each in fluid connection with a respective one of the connecting lines;
a check valve between each second backflow injection line and a respective one of the second waste disposal lines; and flow in the second backflow injection line being controlled by the control means.
a plurality of microscreen filters in series with a plurality of connecting lines between them;
a plurality of second waste disposal lines each in fluid connection with a respective one of the connecting lines, each of the second waste disposal lines including a check valve;
a plurality of second backflow injection lines each in fluid connection with a respective one of the connecting lines;
a check valve between each second backflow injection line and a respective one of the second waste disposal lines; and flow in the second backflow injection line being controlled by the control means.
4. The processing system of claim 3 in which the microscreen filters are graded finer in the downstream direction.
5. The processing system of claim 1 further including an air supply connected to the backflow injection line.
6. The processing system of claim 1 further including a solvent supply connected to the backflow injection line.
7. A method of processing raw water comprising:
filtering the raw water as it passes through filter means from an inlet line;
monitoring the pressure in the inlet line; and backwashing processed water through the filter means and into a waste line when the pressure in the inlet line drops below a preselected level.
filtering the raw water as it passes through filter means from an inlet line;
monitoring the pressure in the inlet line; and backwashing processed water through the filter means and into a waste line when the pressure in the inlet line drops below a preselected level.
8. The method of claim 7 further including backwashing air through the filter means and into a waste line when the pressure in the inlet line drops below a preselected level.
9. The method of claim 7 further including backwashing solvent through the filter means and into a waste line when the pressure in the inlet line drops below a preselected level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2043316 CA2043316A1 (en) | 1991-05-27 | 1991-05-27 | Water treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2043316 CA2043316A1 (en) | 1991-05-27 | 1991-05-27 | Water treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2043316A1 true CA2043316A1 (en) | 1992-11-28 |
Family
ID=4147671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2043316 Abandoned CA2043316A1 (en) | 1991-05-27 | 1991-05-27 | Water treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2043316A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5989435A (en) * | 1996-09-25 | 1999-11-23 | Bethlehem Steel Corporation | Method for magnetically filtering wastewaters containing oil-coated mill scale |
-
1991
- 1991-05-27 CA CA 2043316 patent/CA2043316A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5989435A (en) * | 1996-09-25 | 1999-11-23 | Bethlehem Steel Corporation | Method for magnetically filtering wastewaters containing oil-coated mill scale |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |