CA2278915A1 - Waste water treatment apparatus and method - Google Patents
Waste water treatment apparatus and method Download PDFInfo
- Publication number
- CA2278915A1 CA2278915A1 CA 2278915 CA2278915A CA2278915A1 CA 2278915 A1 CA2278915 A1 CA 2278915A1 CA 2278915 CA2278915 CA 2278915 CA 2278915 A CA2278915 A CA 2278915A CA 2278915 A1 CA2278915 A1 CA 2278915A1
- Authority
- CA
- Canada
- Prior art keywords
- chamber
- waste water
- outlet
- communicating
- treatment apparatus
- 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
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
- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
-
- 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
- C02F3/10—Packings; Fillings; Grids
-
- 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
- C02F3/30—Aerobic and anaerobic processes
-
- 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
-
- 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
Abstract
A waste water treatment apparatus has an aerobic first chamber with an aeration air inlet communicating with the lower portion of the first chamber, a second anaerobic chamber, a waste water inlet communicating with the first chamber, a first outlet from an upper portion of the first chamber communicating with the second chamber, a third chamber, a second outlet from the second chamber communicating with the third chamber, and a third outlet from the third chamber.
Description
WASTE WATER TREATMENT APPARATUS AND METHOD
The present invention relates to a waste water treatment apparatus and method employing aerobic and anaerobic treatments for the purification of waste water.
It has previously been proposed to purify waste water by firstly subjecting the waste water to anaerobic treatment and, subsequently, to aerobic treatment.
It has now been found that improved results can be obtained by firstly effecting an aerobic treatment of the waste water, and by subsequently effecting an anaerobic treatment of the thus-treated waste water.
More particularly, according to the present invention there is provided a waste water treatment apparatus comprising a first chamber, the first chamber being an aerobic chamber having upper and lower portions, an aeration air inlet communicating with the lower portion of the first chamber, a second chamber, the second chamber comprising an anaerobic chamber, a waste water inlet communicating with the first chamber, a first outlet from the upper portion of the first chamber, the outlet communicating with the second chamber, a third chamber, a second outlet from the second chamber communicating with the third chamber, and a third outlet from the third chamber.
The present invention also provides a method of treating waste water, which comprises discharging the waste water and aerating air into a first chamber, effecting aerobic treatment in the first chamber discharging the treated liquid from the first chamber into a second chamber, effecting aerobic treatment in the second chamber, recycling solids from the second chamber to the first chamber, and discharging the liquid from the second chamber to a third chamber.
The present invention relates to a waste water treatment apparatus and method employing aerobic and anaerobic treatments for the purification of waste water.
It has previously been proposed to purify waste water by firstly subjecting the waste water to anaerobic treatment and, subsequently, to aerobic treatment.
It has now been found that improved results can be obtained by firstly effecting an aerobic treatment of the waste water, and by subsequently effecting an anaerobic treatment of the thus-treated waste water.
More particularly, according to the present invention there is provided a waste water treatment apparatus comprising a first chamber, the first chamber being an aerobic chamber having upper and lower portions, an aeration air inlet communicating with the lower portion of the first chamber, a second chamber, the second chamber comprising an anaerobic chamber, a waste water inlet communicating with the first chamber, a first outlet from the upper portion of the first chamber, the outlet communicating with the second chamber, a third chamber, a second outlet from the second chamber communicating with the third chamber, and a third outlet from the third chamber.
The present invention also provides a method of treating waste water, which comprises discharging the waste water and aerating air into a first chamber, effecting aerobic treatment in the first chamber discharging the treated liquid from the first chamber into a second chamber, effecting aerobic treatment in the second chamber, recycling solids from the second chamber to the first chamber, and discharging the liquid from the second chamber to a third chamber.
The invention will be more readily understood from the following description of an embodiment thereof given, by way of example, with reference to the accompanying drawings, in which:-Figure 1 shows a view in side elevation of a waste water treatment apparatus embodying the presentinvention;
Figure 2 shows a plan view of the apparatus of Figure 1;
Figure 3 shows a view in vertical cross-section through a first chamber forming. part of the apparatus of Figure 1, with the top of the chamber removed;
Figure 4 shows a plan view of the chamber of Figure 3;
Figures S and 6 show views taken in vertical cross-section along the lines 5-5 and 6-6 of Figure 4;
Figure 7 shows a view in vertical cross-section through a second chamber forming part of the apparatus of Figure 1 with the cover of the second chamber removed;
Figure 8 shows a plan view of the second chamber, with the cover removed;
Figures 9 and 10 show views taken in vertical cross-section along the lines 9-9 and 10-10 of Figure 8;
Figure 11 shows a view in perspective of the cover of the first and second chambers;
Figure 12 shows a broken-away view illustrating means for securing the cover of Figure 11;
Figure 2 shows a plan view of the apparatus of Figure 1;
Figure 3 shows a view in vertical cross-section through a first chamber forming. part of the apparatus of Figure 1, with the top of the chamber removed;
Figure 4 shows a plan view of the chamber of Figure 3;
Figures S and 6 show views taken in vertical cross-section along the lines 5-5 and 6-6 of Figure 4;
Figure 7 shows a view in vertical cross-section through a second chamber forming part of the apparatus of Figure 1 with the cover of the second chamber removed;
Figure 8 shows a plan view of the second chamber, with the cover removed;
Figures 9 and 10 show views taken in vertical cross-section along the lines 9-9 and 10-10 of Figure 8;
Figure 11 shows a view in perspective of the cover of the first and second chambers;
Figure 12 shows a broken-away view illustrating means for securing the cover of Figure 11;
Figures 13 and 14 show views in side elevation and elevation, respectively, of an air intake;
Figure 15 shows a view in side elevation of a disinfection unit; and Figure 16 shows a view in end elevation of the disinfection unit of Figure 15.
In Figures 1 and 2, there are shown a first tank 10 and a second tank 11, which form parts of a waste water treatment apparatus embodying the present invention and indicated generally by reference numeral 12, the first and second tanks 10 and 11 being sunk into ground indicated generally by reference numeral 14.
The second tank 11 is equipped with a removable housing 16 containing air pumps and electronic equipment (not shown) and connected to an air supply outlet 18 and an air intake 20.
As shown in Figure 3, the first tank 10 contains three chambers, namely a first chamber 22, a second chamber 24 and a third chamber. The first and second chambers 22 and 24 are separated by a baffle 28 and an outlet 30 from an upper portion of the first chamber 22 communicates with an upper portion of the second chamber 24.
A bottom portion of the first chamber 22 contains an air diffusing particulate material 32, which in the present embodiment comprises sand, and aeration air inlet pipes 34 extend downwardly through the first chamber 22 into the particulate material 32, at which they are provided with air outlet openings 36 for discharging air through the sand into the remainder of the first chamber 22.
In the second chamber 24, a U-shaped piping 38, which extends downwardly through the second chamber 24, is provided at a lower portion of the second chamber 24 with a venturi outlet 40, this piping 3 8 being connected through a ball valve 42 to an air supply line 44 and by a return pipe 45 to the first chamber 22.
A second outlet 46, from the second chamber 24, communicates through a baffle 48, separating the second and third chambers 24 and 26, with the third chamber 26, which in turn is provided with a third outlet 50.
The third outlet 50 communicates with the second tank 11, which is divided by baffles 52 and 54 into a fourth chamber 56, a fifth chamber 58 and a sixth chamber 60.
The outlet 50 communicates with an inlet 62 to the fourth chamber 56, and the baffle 52 terminates above the bottom of the second tank 11 so as to provide a fourth outlet 63 from the fourth chamber 56, communicating with the fifth chamber 58.
Air inlet pipes 64 and 65 extend downwardly through the fourth and fifth chambers 56 and 58 to openings 61 in particulate material 66 in the bottom of the tank and, in the first embodiment, the particulate material 66 is sand. This particulate material 66 serves to diffuse air supplied through the pipes 64 and 65 into the fourth and fifth chambers 56 and 58 for effecting aerobic digestion of waste in the fourth and fifth chambers 56 and 58.
The fourth and fifth chambers 56 and 58 also contain bacteria growth media 68 and 70, which are each formed by a plurality of corrugated plates arranged side by side, with the corrugations extending in alternate diagonal directions. The fifth chamber 58 is also provided with a U-shaped piping 67 provided, at the bottom of the fifth chamber 58, with a venturi outlet and also connected to a return pipe 71 extending to the fourth chamber 56.
An outlet 72 from the fifth chamber 58 to the sixth chamber 60 is provided in an upper portion of the baffle 54, and a further baffle 74 extends downwardly from past this opening.
As can be seen in Figure 7, the baffle 54 is formed by upper and lower vertical sections 76 and 77 connected by an inclined intermediate section 78, and the baffle 74 is formed with a vertical upper section 80 and a lower section 82 which is inclined towards the baffle 54, but which is spaced from the baffle 74. By this means, solids within the fifth chamber 58 are deflected downwardly, past the outlet opening 72 by the baffle 74 to the lower section 77 of the baffle 54, while liquid is able to flow past the lower edge of the baffle 74 to the outlet opening 72.
The sixth chamber 60 has an outlet opening 84 which communicates with a disinfection unit indicated generally by reference numeral 86 in Figure 15.
The first and second chambers 22 and 24 are each provided with a cover, indicated generally by reference numeral 88in Figure 11. The cover has a lower portion 90 and a lid 92, which is held down onto the lower portion by a cable 94, provided with a turnbuckle 96, the cable 94 being engaged with retainer hooks 98 secured to the lower portion 90, one of the retainer hooks 98 being shown in Figure 12.
The air inlet 20, which is shown in Figures 13 and 14, is provided with a louvre 100, as shown in Figure 14.
The disinfection unit 86, as shown in Figures 15 and 16, comprises a housing 102 of triangular cross-section, which has a bottom 104. Within the housing 102, an ultraviolet radiation source 106 extends substantially the entire length of the housing 102, along an upper portion of the housing 102.
An inlet 108 for the liquid being treated communicates with the interior of the housing, and the bottom of the housing is provided with raised portions in the form of a plurality of parallel raised ribs 110.
In operation of the above-described apparatus, waste water is supplied into the first chamber 22 and is subjected in the first chamber 22 to aeration produced by discharge of air into the particulate diffusing material 32. From the first chamber 22, the liquid passes through the first outlet 32 into the second chamber 24, where it is subjected to anaerobic treatment. Solid material, which tends to fall to the bottom of the second chamber 22, is extracted by a venturi effect through the venturi outlet 40, by passing air through the U-shaped piping 38, and the solid material thus extracted is recycled through a sludge return pipe 112 to the first chamber 22.
From the second chamber 24, the thus-treated liquid passes into the third chamber 26 and, in turn, to the second tank 11 and, more particularly, to the fourth chamber 56. In the fourth and fifth chambers 56 and 58, the liquid is again subjected to aeration through the pipes 64 and 65 and to aerobic digestion by bacteria growing on the bacteria growth media 68 and 70.
From the fifth chamber 58, solids are returned through the return pipe 71 to the fourth chamber 56.
The liquid then flows through the outlet 72 into the sixth chamber 60 and, from the sixth chamber 60, into the disinfection unit 86.
As the liquid flows across the bottom of the disinfection unit 86, the raised portions or ribs 110 cause the liquid to be swirled about, so that the liquid is thoroughly exposed to ultraviolet radiation and, thus is effectively purified by this radiation.
As will be apparent to those skilled in the art, various modifications may be made to the above-described embodiment within the scope of the appended claims.
Figure 15 shows a view in side elevation of a disinfection unit; and Figure 16 shows a view in end elevation of the disinfection unit of Figure 15.
In Figures 1 and 2, there are shown a first tank 10 and a second tank 11, which form parts of a waste water treatment apparatus embodying the present invention and indicated generally by reference numeral 12, the first and second tanks 10 and 11 being sunk into ground indicated generally by reference numeral 14.
The second tank 11 is equipped with a removable housing 16 containing air pumps and electronic equipment (not shown) and connected to an air supply outlet 18 and an air intake 20.
As shown in Figure 3, the first tank 10 contains three chambers, namely a first chamber 22, a second chamber 24 and a third chamber. The first and second chambers 22 and 24 are separated by a baffle 28 and an outlet 30 from an upper portion of the first chamber 22 communicates with an upper portion of the second chamber 24.
A bottom portion of the first chamber 22 contains an air diffusing particulate material 32, which in the present embodiment comprises sand, and aeration air inlet pipes 34 extend downwardly through the first chamber 22 into the particulate material 32, at which they are provided with air outlet openings 36 for discharging air through the sand into the remainder of the first chamber 22.
In the second chamber 24, a U-shaped piping 38, which extends downwardly through the second chamber 24, is provided at a lower portion of the second chamber 24 with a venturi outlet 40, this piping 3 8 being connected through a ball valve 42 to an air supply line 44 and by a return pipe 45 to the first chamber 22.
A second outlet 46, from the second chamber 24, communicates through a baffle 48, separating the second and third chambers 24 and 26, with the third chamber 26, which in turn is provided with a third outlet 50.
The third outlet 50 communicates with the second tank 11, which is divided by baffles 52 and 54 into a fourth chamber 56, a fifth chamber 58 and a sixth chamber 60.
The outlet 50 communicates with an inlet 62 to the fourth chamber 56, and the baffle 52 terminates above the bottom of the second tank 11 so as to provide a fourth outlet 63 from the fourth chamber 56, communicating with the fifth chamber 58.
Air inlet pipes 64 and 65 extend downwardly through the fourth and fifth chambers 56 and 58 to openings 61 in particulate material 66 in the bottom of the tank and, in the first embodiment, the particulate material 66 is sand. This particulate material 66 serves to diffuse air supplied through the pipes 64 and 65 into the fourth and fifth chambers 56 and 58 for effecting aerobic digestion of waste in the fourth and fifth chambers 56 and 58.
The fourth and fifth chambers 56 and 58 also contain bacteria growth media 68 and 70, which are each formed by a plurality of corrugated plates arranged side by side, with the corrugations extending in alternate diagonal directions. The fifth chamber 58 is also provided with a U-shaped piping 67 provided, at the bottom of the fifth chamber 58, with a venturi outlet and also connected to a return pipe 71 extending to the fourth chamber 56.
An outlet 72 from the fifth chamber 58 to the sixth chamber 60 is provided in an upper portion of the baffle 54, and a further baffle 74 extends downwardly from past this opening.
As can be seen in Figure 7, the baffle 54 is formed by upper and lower vertical sections 76 and 77 connected by an inclined intermediate section 78, and the baffle 74 is formed with a vertical upper section 80 and a lower section 82 which is inclined towards the baffle 54, but which is spaced from the baffle 74. By this means, solids within the fifth chamber 58 are deflected downwardly, past the outlet opening 72 by the baffle 74 to the lower section 77 of the baffle 54, while liquid is able to flow past the lower edge of the baffle 74 to the outlet opening 72.
The sixth chamber 60 has an outlet opening 84 which communicates with a disinfection unit indicated generally by reference numeral 86 in Figure 15.
The first and second chambers 22 and 24 are each provided with a cover, indicated generally by reference numeral 88in Figure 11. The cover has a lower portion 90 and a lid 92, which is held down onto the lower portion by a cable 94, provided with a turnbuckle 96, the cable 94 being engaged with retainer hooks 98 secured to the lower portion 90, one of the retainer hooks 98 being shown in Figure 12.
The air inlet 20, which is shown in Figures 13 and 14, is provided with a louvre 100, as shown in Figure 14.
The disinfection unit 86, as shown in Figures 15 and 16, comprises a housing 102 of triangular cross-section, which has a bottom 104. Within the housing 102, an ultraviolet radiation source 106 extends substantially the entire length of the housing 102, along an upper portion of the housing 102.
An inlet 108 for the liquid being treated communicates with the interior of the housing, and the bottom of the housing is provided with raised portions in the form of a plurality of parallel raised ribs 110.
In operation of the above-described apparatus, waste water is supplied into the first chamber 22 and is subjected in the first chamber 22 to aeration produced by discharge of air into the particulate diffusing material 32. From the first chamber 22, the liquid passes through the first outlet 32 into the second chamber 24, where it is subjected to anaerobic treatment. Solid material, which tends to fall to the bottom of the second chamber 22, is extracted by a venturi effect through the venturi outlet 40, by passing air through the U-shaped piping 38, and the solid material thus extracted is recycled through a sludge return pipe 112 to the first chamber 22.
From the second chamber 24, the thus-treated liquid passes into the third chamber 26 and, in turn, to the second tank 11 and, more particularly, to the fourth chamber 56. In the fourth and fifth chambers 56 and 58, the liquid is again subjected to aeration through the pipes 64 and 65 and to aerobic digestion by bacteria growing on the bacteria growth media 68 and 70.
From the fifth chamber 58, solids are returned through the return pipe 71 to the fourth chamber 56.
The liquid then flows through the outlet 72 into the sixth chamber 60 and, from the sixth chamber 60, into the disinfection unit 86.
As the liquid flows across the bottom of the disinfection unit 86, the raised portions or ribs 110 cause the liquid to be swirled about, so that the liquid is thoroughly exposed to ultraviolet radiation and, thus is effectively purified by this radiation.
As will be apparent to those skilled in the art, various modifications may be made to the above-described embodiment within the scope of the appended claims.
Claims (12)
1. A waste water treatment apparatus, comprising a first chamber, said first chamber being an aerobic chamber having upper and lower portions, an aeration air inlet communicating with said lower portion of said first chamber, a second chamber, said second chamber comprising an anaerobic chamber, a waste water inlet communicating with said first chamber, a first outlet from said upper portion of said first chamber, said outlet communicating with said second chamber, a third chamber, a second outlet from said second chamber communicating with said third chamber, and a third outlet 50 from said third chamber.
2. A waste water treatment apparatus as claimed in claim 1, wherein an air diffusing particulate material is provided in said lower portion of said first chamber, and said aeration air inlet has an air outlet located within said air diffusing particulate material.
3. A waste water treatment apparatus as claimed in claim 1 or 2, including a venturi outlet in said second chamber, said venturi outlet communicating with said first chamber.
4. A waste water treatment apparatus as claimed in claim 1, 2 or 3, including a fourth chamber, a second aeration air inlet communicating with said fourth chamber and a bacteria growth medium in said fourth chamber, said third outlet communicating with said fourth chamber.
5. A waste water treatment apparatus as claimed in claim 4, further comprising a fifth chamber, a further bacteria growth medium in said fifth chamber, a fourth outlet from said fourth chamber communicating with said fifth chamber and a third aeration air outlet communicating with said fifth chamber.
6. A waste water treatment apparatus as claimed in claim 5, further comprising a venturi outlet located in said fifth chamber and communicating with said fourth chamber.
7. A waste water treatment apparatus as claimed in claim 5 and 6, including a first baffle separating said fifth and sixth chambers, an opening provided in an upper part of said baffle and communicating with said fifth and sixth chambers and a second baffle in an upper portion of said fifth chamber, said second baffle extending downwardly past said opening for deflecting descending solids past said opening.
8. A waste water treatment apparatus as claimed in any one of claims 1 to 7, which includes a disinfection unit, said disinfection unit comprising a disinfection chamber having a bottom, an inlet for receiving the liquid, a ultraviolet radiation source for irradiating the liquid as the liquid flows over the bottom and a plurality of raised portions on said bottom.
9. A waste water treatment apparatus as claimed in claim 8, wherein said raised portions comprise parallel ribs on said bottom.
10. A method of treating waste water, which comprises discharging the waste water and aeration air into a first chamber, effecting aerobic treatment in said first chamber discharging the treated liquid from the first chamber into a second chamber, effecting aerobic treatment in said second chamber, recycling solids from said second chamber to said first chamber, and discharging the liquid from said second chamber to a third chamber.
11. A method as claimed in claim 10, which includes transferring the liquid from the third chamber to a fourth chamber containing a bacteria growth medium and effecting aerobic treatment in said fourth chamber.
12. A method as claimed in claim 10 or 11, which includes disinfecting the liquid by flowing the liquid over a surface having raised portions while irradiating the liquid with ultraviolet radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2278915 CA2278915A1 (en) | 1999-07-26 | 1999-07-26 | Waste water treatment apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2278915 CA2278915A1 (en) | 1999-07-26 | 1999-07-26 | Waste water treatment apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2278915A1 true CA2278915A1 (en) | 2001-01-26 |
Family
ID=4163839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2278915 Abandoned CA2278915A1 (en) | 1999-07-26 | 1999-07-26 | Waste water treatment apparatus and method |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2278915A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009153437A2 (en) * | 2008-05-26 | 2009-12-23 | Otv Sa | Method for the biological treatment of an effluent and associated plant |
-
1999
- 1999-07-26 CA CA 2278915 patent/CA2278915A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009153437A2 (en) * | 2008-05-26 | 2009-12-23 | Otv Sa | Method for the biological treatment of an effluent and associated plant |
| WO2009153437A3 (en) * | 2008-05-26 | 2010-02-25 | Otv Sa | Method for the biological treatment of an effluent and associated plant |
| US20110068056A1 (en) * | 2008-05-26 | 2011-03-24 | Marc Caligaris | Method for the Biological Treatment of an Effluent and Associated Plant |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |