GB2364528A - Sewage treatment apparatus - Google Patents
Sewage treatment apparatus Download PDFInfo
- Publication number
- GB2364528A GB2364528A GB0009408A GB0009408A GB2364528A GB 2364528 A GB2364528 A GB 2364528A GB 0009408 A GB0009408 A GB 0009408A GB 0009408 A GB0009408 A GB 0009408A GB 2364528 A GB2364528 A GB 2364528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tank
- fluid
- conduit
- contents
- settlement
- 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.)
- Granted
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
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
- C02F3/1247—Small compact installations for use in homes, apartment blocks, hotels or the like comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
-
- 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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Biological Wastes In General (AREA)
Abstract
Sewage treatment apparatus having two tanks, one tank (1) to receive incoming sewage and the second tank (2) to allow settlement of the contents within the second tank. The sewage is discharged into the second tank via a first discharging means (20) and the contents of the second tank are discharged, after settlement, via a conduit (12). The apparatus also has control means to control the intervals at which the first and second discharging means operate, in dependence on time and/or the level of material in the first and second tanks. The settlement tank (2) is concentric within the waste entry tank (1). Waste is pumped back into the first tank (1) from the second tank (2) to aid mixing. The outer tank (1) may be sludge activated and continuously aerated.
Description
2364528 SEWAGE TREATMENT APPARATUS
Field of the Invention
This invention relates to sewage and wastewater treatment apparatus. 5 Background to the Invention
In the treatment of raw sewage, it is common for waste material to undergo a two-stage process. In the first stage, raw material is collected in a first, activated sludge tank where it is continuously aerated by blowing air into the tank. The material flows into a second tank, the settlement or clarifier tank, where the solids separate and the 10 liquid effluent becomes clean enough for it to be drawn off or overflow into waterways. There is continuous flow through the tanks and the levels in both tanks remain substantially constant.
One of the major problems with this type of system is that the settlement tank has to be large enough to handle the maximum flow rate of input to the system. As a 15 result, there is a risk of the sludge becoming anaerobic and/or septic because of the large sludge within the tank. A bridge scraper is required to return sludge to the activated sludge tank.
In sequential batch reactors (SBRs) two tanks each operate alternately as the activated sludge tank and as the settlement tank. During the settlement phase of the cycle 20 the incoming flow is usually stopped. This system requires sensitive control to ensure that the tanks operate in sequence to prevent the contents of the tank from being discharged prematurely, i.e. before the contents have sufficiently settled.
In addition, aeration of the activated sludge tank has to be stopped when that tank is about to become the settlement tank in its part of the cycle. That therefore re- 25 quires the aeration means to be sealed off at the end of its cycle. This requires a complex and expensive sealing and closure system.
Summary of the Invention
In order to overcome the problems associated with the known sewage treatment systems, the invention provides sewage treatment apparatus comprising a first and 30 a second tank, the first tank adapted to receive incoming raw sewage, the second tank adapted to allow settlement of the contents of the second tank, means for treating the contents of the first tank, first means for discharging a proportion of the contents of the first tank into the second tank and second means for discharging a proportion of the contents of the second tank after settlement, and means for controlling the intervals at which the first and second discharging means operate, the controlling means operating 5 in dependence on time and/or the level of material in the first and second tanks.
The tanks may conveniently be arranged concentrically, one within the other.
In this case, the outer tank is preferably the first, activated sludge tank and the inner tank is the second, settlement tank.
Preferably, the outer tank is a continuously aerated activated sludge tank.
10 Advantageously, the outer tank has first conduit means to deliver influent con tinuously to the outer tank.
The apparatus preferably has second conduit means to discharge final effluent from the top of the inner tank.
The apparatus may be further provided with third conduit means associated 15 with pump means so arranged as to deliver fluid from the base of the inner tank to the top of the outer tank.
Said fluid is preferably delivered to the outer tank in a contact zone adjacent the outfall of the first conduit means so as to mix the flow from the said first conduit means with the flow from the said third conduit means.
20 Preferably, the apparatus is additionally provided with fourth conduit means whose inlet is located at a level below the maximum fluid level in the outer tank and whose outlet is located adjacent the base of the inner tank, whereby to transfer fluid from the top of the outer tank to the base of the inner tank.
Valve means may be provided to control flow within said fourth conduit means.
25 Weir means is preferably provided within the upper end of the inner tank to al low discharge of final effluent from the inner tank.
The outer tank is preferably provided with aeration system means in order to activate fluid waste within the said tanks.
The apparatus is also preferably provided with an inspection platform extending 30 at least partially over the top of at least one of the tanks.
The invention also provides a method of treating raw sewage in which waste material to be treated enters a first tank and, after a first interval of time, passes into a second, settlement tank, from which final effluent is subsequently drawn off after a sec ond interval of time, the said intervals being dependent on time and/or the level of ma 5 terial in the first tank.
The invention also comprehends a method of operating the apparatus in which:
(a) fluid waste enters the first tank; (b) the waste in the first tank is continuously activated; (c) after a first interval of time, a proportion of fluid from the first tank is dis 10 charged into the second tank for settlement, and (d) after a second interval of time, a proportion of the settled fluid in the second tank is discharged out of the second tank.
In each of the above methods, the second tank is preferably concentric within the first tank.
15 The contents of the base of the second tank may be discharged back into the top of the first tank to aid breakdown of the material being treated.
Brief Description of the Drawings
The invention will be described with reference to the accompanying drawings in which:
20 Fig 1 shows a side sectional view of a concentric tank sewage treatment appara tus according to one embodiment of the invention; Fig 2 shows a plan view of the apparatus of Fig 1; Fig 3 shows a section taken on lines A-A of Fig 2 illustrating a particular section of pipework coupling the top of the outer tank to the base of the inner tank; and 25 Figs 4 to 7 show simplified views of the apparatus of Fig 1 at various phases of its operational cycle.
Detailed Description of the Illustrated Embodiment
As shown in Figs 1 and 2, the apparatus according to the embodiment of the in vention consists of an outer, sludge activated tank 1 concentric with an inner, settlement 30 tank 2. The tanks are of unitary construction and may be made of concrete or steel or other suitable materials as known in the art. Bridging across the tops of the tanks is an access platform 3 as is usually provided for maintenance personnel. In the embodiment described, the platform has a grid flooring with a circular central portion 4 and a walk way 5 to allow access to the centre. Safety railings 6 surround the centre and the walkway.
5 The incoming waste enters the outer tank, either as gravity fed or pumped in fluent 7 through a pipe or other conduit 8. As will become apparent later, material from the inner tank can also enter the outer tank through a further pipe 9 connected to the output of a pump 10 located in the base of the inner tank. Power to the pump 10 is taken down through the contents of the inner tank through a reinforced cable 10a.
10 The inner tank may also have benching 11, as best shown in Fig 1, to prevent waste otherwise adhering to the corners of the tank.
At the diametrically opposite side of the tanks from the influent pipe 8 is located an outlet pipe or other conduit 12 for clean effluent 13. The pipe 12 emerges from an effluent output chamber which communicates with the inner tank and which is provided 15 with a baffle 14 to prevent the contents of the aerated, outer tank from leaking into the effluent flow from the inner tank. At appropriate times, a weir 15, such as an Actuated Penstock Weir, is opened to allow the settled contents from the top of the inner tank to discharge through the effluent pipe'12 into the designated discharge route, e.g. to a waterway (not shown). A float mounted baffle (not shown) will be fitted to the weir to 20 prevent floating material passing over the weir.
Two aeration blowers 16,16a are located outside the tanks and arranged so that one is on duty whilst the other is on standby. Ducting 17 conveys the pumped air through air channels in a lift-out gridl 8 placed at the base of the outer tank. Alterna tively, a jet aeration system (not shown) could be used.
25 The zone 19 where the influent and any material pumped from the base of the inner tank meet near the influent entry pipe is designated as the contact zone. The in fluent material adopts a counter-clockwise flow pattern as indicated generally by the broad arrow.
Fig 3 shows a cross-section of the pipework 20 connecting the base of the set 30 tlement tank to the top of the outer tank. An actuated influent valve 21, 22 opens or closes the passageway defined by the pipe 20. Although shown within the outer tank, this valve may alternatively be located outside the outer tank for ease of maintenance.
The mouth 23 of the pipe 20 is located at a predetermined level relative to the material in the outer tank whilst the discharge end of the pipe is located close to the base of the inner, settlement tank.
5 Also, the mouth 23 of the pipe is positioned at the end of the counterclockwise flow in the outer tank to avoid the risk that waste in the outer tank might "short-circuit" the aeration lane established in the outer tank. The discharge end of the pipe is angled, as can be seen from Fig 2, so as to impart a radial flow within the inner tank. Flow from the base of the pipe emerges tangentially to the wall of the inner tank so as to stir the 10 contents of the base of the inner tank, thereby disturbing the blanket of settled sewage from the previous cycle and mixing in the new aerated batch.
The arrangement of tanks, valves and levels is such that the maximum volume of material likely to be encountered under high flow conditions can be accommodated by transfer from the outer to the inner tank. For example, a volume of say 10 cubic me 15 tres is transferred from the outer to the inner tank when the levels are allowed to equalise. Likewise, the same volume of clean effluent is decanted from the inner tank when the weir is opened.
The apparatus operates according to a cycle which is illustrated in Figs 4 to 7.
For the sake of clarity, reference numerals have been omitted from these figures in or 20 der to show the fluid levels more clearly. The cycle operates as follows.
At the beginning of the cycle, as shown in Fig 4, material in the inner tank is at its lowest level, following decanting of the settled fluid at the end of the previous cycle, as will be described later. Influent enters the outer tank in a continuous flow where it may be mixed in the contact zone with material pumped up from the base of the inner 25 tank. The outer tank is continuously aerated. Over the next 60 minutes or so and un der maximum flow conditions, the level in the outer tank continues to rise from a base level to a level close to but less than the maximum as more raw sewage enters the outer tank. During that time, the contents of the inner tank settle. A time period of 60 min utes is chosen to allow the contents of the inner tank to settle for a minimum of 45 30 minutes and for the clean effluent to be decanted from the top of the inner tank over a period of 15 minutes. The levels will be as shown in Fig 5 at this stage.
After the 60-minute period has passed, the influent valve (21, 22 Fig 3) is opened for a pre-set time. This allows a batch of fluid material from the outer tank to flow into the base of the inner tank through the pipe 20. The levels in the tanks will quickly equalise, as shown in Fig 6. The influent valve is then closed. Raw sewage con 5 tinues to enter the outer tank whose level therefore continues to rise towards the high level of Fig 5.
The contents of the inner tank are allowed to settle for a period of at least 45 minutes, for example around 50 minutes. After this time has elapsed, the Penstock weir is lowered to allow clean effluent to be decanted from the top of the inner tank.
10 The fluid in the inner tank then drops to a fixed, bottom level within about 10 minutes after the weir is opened, as shown in Fig 7. The gate of the weir is then raised to pre pare the inner tank to receive another batch of fluid from the outer tank at the appropriate point in the next cycle.
The above process is based on a high flow rate. However, if the flow rate is 15 low, the outer tank will fill more slowly. Under these circumstances, there is a danger that the contents of the inner tank will become anoxic, due to lack of oxygen. The ap paratus therefore incorporates the feedback pipe 20 to allow a proportion of the set tled contents of the inner tank to be pumped back into the outer tank for recycling with the untreated, incoming raw sewage.
20 The apparatus is intended to be operated on a combined time and/or level con trol basis. Levels can readily be detected by sensors. Although traditional level sensors can be used, they are prone to failure and require high maintenance. It is preferable, therefore, for pressure sensors to be located at the bottom of the tank(s) or for ultra sonic transducers to be used to monitor characteristics of the fluids in the tanks which 25 can readily be translated into level values.
Where low flow rates are detected as above, the initial 60 minute fill cycle can be extended to a maximum of, for example, 120 minutes by suitable timing mechanisms and/or electronics. Of course, if the sensors detect that the level in the outer tank has reached the maximum before then, the fill phase is stopped before the 120 minute 30 time-out and the cycle is moved on to the next phase. Under low flow rate conditions, the inner tank contents are continuously aerated at the start of the settlement phase to prevent septicity. The contents of the inner tank are preferably decanted after a maximum of 60 minutes, regardless of influent rate, in order to reduce further the risk of the contents of the inner tank becoming aseptic and/or anoxic.
An overflow 24 from the outer tank (Fig 3), set above normal operating top 5 water level, will transfer flow in excess of maximum design flow into the settled sludge blanket within the inner tank. This will enable extra hydraulic volume to be gained by raising the level of the inner tank to equal the level in the outer tank. Normally, the maximum level in the inner tank is equal to the bottom water level in the outer tank.
It should be noted that the apparatus described is failsafe in that the weir only al- 10 lows overflow into the next phase of the treatment process and effluent can only discharge from the inner, settlement tank. Moreover, if there is damage to the membrane (not shown) containing the fluids within the tank(s) settlement is not affected.
Advantages of the apparatus are that it is modular and can therefore be readily assembled on site in a single basin. The outer tank is continuously filled and there is no 15 fixed operating cycle: the cycle described is adaptable to suit the flow conditions under a simple control philosophy. Decanting of the final effluent takes place at regular, frequent intervals, one hour in the preferred embodiment. Maintenance of the operative components of the apparatus can be achieved simply by draining the inner tank without loss of activated sewage. Any convenient aeration system may be used in the appara- 20 tus, such as fine or coarse bubble systems.
The apparatus is considerably cheaper to construct and maintain and has greater reliability than prior sewage treatment apparatus. A typical example of the apparatus may have the capacity to process the waste from a population of around 1,000 and may occupy a basin in the region of 6m depth and 8m diameter.
Claims (23)
1. Sewage treatment apparatus comprising a first tank to receive incoming raw sewage, treatment means arranged to treat the contents of the first tank, a second, set- 5 flement tank, first discharging means to discharge a proportion of the contents of the first tank into the second tank, second discharging means to discharge a proportion of the contents of the second tank after settlement, and control means arranged to control operation of the first and second discharging means in dependence on time and/or the level of material in the first and second tanks.
lo
2. Apparatus as claimed in Claim 1 wherein the tanks are arranged concentrically, one within the other.
3. Apparatus as claimed in Claim 2 wherein the first tank is the outermost tank.
4. Apparatus as claimed in Claims 1, 2 or 3 wherein the first tank is continuously aerated.
a d t 15
5. Apparatus as claimed in any of the preceding claims comprising a first conduit to deliver influent continuously to the first tank.
6. Apparatus as claimed in any of the preceding claims comprising a second con duit to discharge final effluent from the second tank.
7. Apparatus as claimed in any of the preceding claims comprising a third conduit 20 to deliver fluid from the base of the second tank to the top of the first tank.
8. Apparatus as claimed in Claim 7 wherein the third conduit is associated with pump means to facilitate the delivery of fluid from the base of the second tank to the top of the first tank.
9. Apparatus as claimed in Claims 7 or 8 wherein the third conduit is arranged to 25 deliver said fluid to the first tank in a contact zone adjacent the region where incoming raw sewage enters the first tank so as to facilitate mixing of the fluid with the incoming raw sewage.
10. Apparatus as claimed in any of the preceding claims comprising a fourth conduit having an inlet, which is located at a level below the maximum fluid level in the first tank, and an outlet, which is located adjacent the base of the second tank, whereby fluid is transferred from the top of the first tank to the base of the second tank.
11. Apparatus as claimed in Claim 10 wherein the outlet of the fourth conduit is an gled so as to impart a radial flow within the second tank.
12. Apparatus as claimed in Claim 10 or 11 comprising valve means to control the flow within the fourth conduit means.
5
13. Apparatus as claimed in any of the preceding claims wherein the upper end of the second tank has weir means to allow discharge of final effluent from the second tank.
14. Apparatus as claimed in any of the preceding claims comprising an inspecting platform partially extending over the top of at least one of the tanks.
10
15. A method of treating raw sewage in which waste material to be treated enters a first tank and, after a first interval of time, passes into a second, settlement tank, from which final effluent is subsequently drawn off after a second interval of time, the said intervals being dependent on time and/or the level of material in the first tank.
16. A method as claimed in Claim 15 wherein fluid waste enters the flrst tank con tinuously via an inlet.
17. A method as claimed in Claim 15 or 16 wherein the waste in the first tank is continuously aerated.
18. A method as claimed in Claim 15, 16 or 17 wherein after said first interval of time, a proportion of fluid from the first tank is discharged into the second tank for 20 settlement.
19. A method according to any of Claims 15-18, wherein after said second interval of time, a proportion of the settled fluid in the second tank is discharged out of the second tank.
20. A method according to any of Claims 15-19, wherein the second tank is concen tric with the first tank.
21. A method according to any of Claims 15-20, wherein the contents of the base of the second tank are discharged into the first tank to aid the breakdown of the material being treated.
22. Sewage treatment apparatus, substantially as described with reference to, or as 30 shown in, the drawings.
23. A method of treating raw sewage, substantially as described with reference to, or as shown in, the drawings.
0.:
- I t C 6 C a 4 ',
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0009408A GB2364528B (en) | 2000-04-18 | 2000-04-18 | Sewage treatment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0009408A GB2364528B (en) | 2000-04-18 | 2000-04-18 | Sewage treatment apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0009408D0 GB0009408D0 (en) | 2000-06-07 |
| GB2364528A true GB2364528A (en) | 2002-01-30 |
| GB2364528B GB2364528B (en) | 2005-04-20 |
Family
ID=9890038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0009408A Expired - Fee Related GB2364528B (en) | 2000-04-18 | 2000-04-18 | Sewage treatment apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2364528B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1015375A3 (en) * | 2003-02-25 | 2005-02-01 | Belleaqua Bvba | Water purification installation for small scale treatment of effluent, includes trough for controlling flow of water into pre sedimentation chamber from aeration chamber |
| WO2012016347A1 (en) * | 2010-08-04 | 2012-02-09 | Edmundo Ganter Parga | Limited volume sbr system and method for treating wastewater |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507393A (en) * | 1969-06-18 | 1970-04-21 | Union Tank Car Co | Sewage treatment system |
| GB1323992A (en) * | 1971-01-13 | 1973-07-18 | Wastech Inc | Liquid treating apparatus |
| SU861342A1 (en) * | 1979-12-06 | 1981-09-07 | Всесоюзный Научно-Исследовательский Институт Водоснабжения, Канализации, Гидротехнических Сооружений И Инженерной Гидрогеологии "Водгео" | Device for automatic control of silt outlet process from canalization settlers in purification unit |
| JPS57156087A (en) * | 1981-03-24 | 1982-09-27 | Toshiba Corp | Operating system for sewage treatment system by activated sludge method |
| JPS5955392A (en) * | 1982-09-22 | 1984-03-30 | Toshiba Corp | Adjustment device for sludge water |
| GB2138797A (en) * | 1983-02-17 | 1984-10-31 | William Henry Taylor Griffin | Compact sewage purification plant |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3679053A (en) * | 1970-07-27 | 1972-07-25 | Pollution Control Products Inc | Batch sewage treatment system |
| JP3119770B2 (en) * | 1993-08-24 | 2000-12-25 | 住友重機械工業株式会社 | Sewage denitrification treatment method and denitrification treatment device |
| JPH0899094A (en) * | 1994-09-30 | 1996-04-16 | Nippon Sanso Kk | Waste water treatment apparatus |
-
2000
- 2000-04-18 GB GB0009408A patent/GB2364528B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507393A (en) * | 1969-06-18 | 1970-04-21 | Union Tank Car Co | Sewage treatment system |
| GB1323992A (en) * | 1971-01-13 | 1973-07-18 | Wastech Inc | Liquid treating apparatus |
| SU861342A1 (en) * | 1979-12-06 | 1981-09-07 | Всесоюзный Научно-Исследовательский Институт Водоснабжения, Канализации, Гидротехнических Сооружений И Инженерной Гидрогеологии "Водгео" | Device for automatic control of silt outlet process from canalization settlers in purification unit |
| JPS57156087A (en) * | 1981-03-24 | 1982-09-27 | Toshiba Corp | Operating system for sewage treatment system by activated sludge method |
| JPS5955392A (en) * | 1982-09-22 | 1984-03-30 | Toshiba Corp | Adjustment device for sludge water |
| GB2138797A (en) * | 1983-02-17 | 1984-10-31 | William Henry Taylor Griffin | Compact sewage purification plant |
Non-Patent Citations (3)
| Title |
|---|
| PAJ ABSTRACT OF JP 57 156 087 A (TOKYO SHIBAURA) 27.09.1982 * |
| WPI ABSTRACT ACCESSION NO. 1982-54527E [26] & SU 861342 A1(VODGEO) 17.09.1981 * |
| WPI ABSTRACT ACCESSION NO. 1984-117500 [19] & JP 59 055 392 A(TOKYO SHIBAURA) 30.03.1984 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1015375A3 (en) * | 2003-02-25 | 2005-02-01 | Belleaqua Bvba | Water purification installation for small scale treatment of effluent, includes trough for controlling flow of water into pre sedimentation chamber from aeration chamber |
| WO2012016347A1 (en) * | 2010-08-04 | 2012-02-09 | Edmundo Ganter Parga | Limited volume sbr system and method for treating wastewater |
| US9145317B2 (en) | 2010-08-04 | 2015-09-29 | Edmundo Ganter Parga | Limited volume waste water SBR treatment system and process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0009408D0 (en) | 2000-06-07 |
| GB2364528B (en) | 2005-04-20 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20070418 |