GB1588994A - Biological purification of waste water - Google Patents
Biological purification of waste water Download PDFInfo
- Publication number
- GB1588994A GB1588994A GB25916/78A GB2591678A GB1588994A GB 1588994 A GB1588994 A GB 1588994A GB 25916/78 A GB25916/78 A GB 25916/78A GB 2591678 A GB2591678 A GB 2591678A GB 1588994 A GB1588994 A GB 1588994A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- site
- caisson
- purification
- plant
- 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
- 238000000746 purification Methods 0.000 title claims description 55
- 239000002351 wastewater Substances 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000005273 aeration Methods 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 7
- 239000010840 domestic wastewater Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000000855 fermentation Methods 0.000 claims description 2
- 230000004151 fermentation Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000010865 sewage Substances 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
-
- 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)
- Biological Treatment Of Waste Water (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
(54) BIOLOGICAL PURIFICATION OF WASTE WATER
(71) We, STAMICARBON B.V., a
Netherlands Limited Liability Company of
P.O. Box 10, Geleen, the Netherlands, 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 biological purification of waste water and particularly relates to such a purification process carried out at a site initially which is covered by water and is effected in prefabricated plant which is floated to the site; and also relates to a method of constructing such plant from prefabricated units, and to such purification plant so constructed.
Many designs for plants for such purification of domestic and industrial waste water have been used for many years. The location of such plants, especially in densely populated or large industrial conurbations has often been attended by difficulties, particularly due to the fact that such purification plants require a large ground area and also to environmental problems arising from the production of malodorous effects, mists and noise. For these reasons it is mostly necessary for the plant to be situated at some distance (usually from 1 to 2 km) from the nearest buildings. Problems may also arise with existing water discharge systems which generally discharge at a particular fixed point, usually into a natural watercourse flowing through or near the conurbation. As a result of a wrong gradient being present, when integrating the purification plant with the sewage system either the existing water discharge system must be replaced, or a connection made between the lowest point of the said system i.e. where it discharges into the watercourse, and the plant, which requires a pumping station for the transport of the waste water.
The invention is directed to a process for the biological purification of water, and to the construction of plant for such processes, wherein sites may be utilized which at least initially are covered by water, e.g. disused docks or other aqueous sites which are connected by a conduit e.g. a waterway, to open water e.g. an estuary, river, lake or sea, and moreover wherein the biological purification processes are carried out in prefabricated closed unit(s) hereinafter referred to as caissons which are transferred to such sites on water e.g. by towing, and therein sunk. The site may if desired then be at least partially filled e.g. by earth and/or other fill, to form a permanent dry site. By the practice of the invention the disadvantages to conurbations may be mitigated or avoided, and the plant constructed in an expeditious and economical manner.
The process and plant of the invention utilizes one or more prefabricated caissons.
The term "caisson" is hereby defined as a closed vessel in the general form of a box, constructed for example of concrete e.g.
reinforced concrete. The caisson(s) contain one or more of the stages required in known biological purification processes, and essentially including an aeration stage and a sludge settling stage.
The invention provides a process for the biological purification of waste water including an aeration stage and a sludge settling stage, characterized in that the said process is carried out in one or more prefabricated caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, and which have been floated to a process site initially covered by water, and sunk thereat to form a permanently located biological purification plant.
The invention also provides a method of constructing a plant for the biological purification of waste water including an aeration stage and a sludge settling stage, comprising prefabricating one or more caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, floating the said caisson(s) to a plant site initially covered by water, and sinking the said caisson(s) thereat to form a permanentlylocated biological purification plant.
A particular advantage of the method of construction according to the invention is that the caisson(s) are prefabricated and made operational at a point remote from the site selected, following which they may be transported by water to the selected site.
When a plurality of caissons are transported to the selected site, they are interconnected after being sunk, to provide a self-contained purification plant. As hereinbefore described, the site is preferably selected so as to provide a conduit to open water. By this means the purified effluent from the completed purification plant may be expeditiously discharged. Also as hereinbefore described, the method of construction according to the invention may be applied to for example a disused dock.
The site initially covered by water may then be at least partially filled up around the sunken caisson(s). Preferably the caisson(s) when sunk protrude above the level of water initially covering the site and/or of the level of the fill of the subsequently partially filled site, thus enhancing the ease of maintenance, accessibility and construction.
Since the biological purification process according to the invention is carried out in the closed space of the sunken caisson(s), environmental problems of odour and mist formation are overcome, particularly as the air used in the purification process emerging from the plant may be passed to a combustion unit. Furthermore the process is substantially free of noise problems. Any residual noise may readily be suppressed by known means. Thus a water-jet aerator of the type described in United Kingdom
Patent specification 1,458,302, and the anaerobic purification procedure described in United Kingdom Patent specification 1,415,264 may be used to provide aeration within the caisson(s), thus increasing the reliability of the purification process.
It is preferred that circular caisson(s) are used in the plant according to the invention, as the interior of such caissons will not provide any dead corners where undesirable locations for effective purification may occur.
The particular biological purification method used in the process of the invention depends on the type of waste water to be purified. Thus for purification of domestic waste waters, pre-purification aeration and sludge settling, possibly accompanied by sludge fermentation stages will suffice, all stages being included in the caisson(s). For purifying effluent from a large industrial complex, a purification process as described in United Kingdom Patent specification 1,438,697 may be included in the caisson(s).
WHAT WE CLAIM IS:
1. A process for the biological purification of waste water including an aeration stage and a sludge settling stage, characterized in that the said process is carried out in one or more prefabricated caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, and which have been floated to a process site initially covered by water, and sunk thereat to form a permanently located biological purification plant.
2. A process as claimed in Claim 1, wherein the site initially covered by water is connected by a conduit to open water.
3. A process for the biological purification of waste water as claimed in Claim 1, substantially as hereinbefore described.
4. A method of constructing a plant for the biological purification of waste water including an aeration stage and a sludge settling stage, comprising prefabricating one or more caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, floating the said caisson(s) to a plant site initially covered by water, and sinking the said caisson(s) thereat to form a permanently-located biological purification plant.
5. A method as claimed in Claim 4, wherein a plurality of said caissons are employed, which are interconnected after being sunk.
6. A method as claimed in Claim 4, wherein the said site initially covered by water is connected by a conduit to open water.
7. A method as claimed in Claim 4, wherein the said site initially covered by water is a disused dock.
8. A method as claimed in any of Claims 4 to 7, wherein the said site initially covered by water is at least partially filled in after the said caisson(s) have been sunk thereat.
9. A method as claimed in any of Claims 4 to 8, wherein the said caisson(s) after having been sunk at the said site initially covered by water, protrude above the level of water initially covering the said site, and/or above the level of the fill of the sub seuently at least partially filled site.
iso. A purification plant constructed by a method according to any of Claims 4 to 9.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A process for the biological purification of waste water including an aeration stage and a sludge settling stage, characterized in that the said process is carried out in one or more prefabricated caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, and which have been floated to a process site initially covered by water, and sunk thereat to form a permanently located biological purification plant.
2. A process as claimed in Claim 1, wherein the site initially covered by water is connected by a conduit to open water.
3. A process for the biological purification of waste water as claimed in Claim 1, substantially as hereinbefore described.
4. A method of constructing a plant for the biological purification of waste water including an aeration stage and a sludge settling stage, comprising prefabricating one or more caissons as hereinbefore defined, containing or together containing the stages required in a biological purification process, floating the said caisson(s) to a plant site initially covered by water, and sinking the said caisson(s) thereat to form a permanently-located biological purification plant.
5. A method as claimed in Claim 4, wherein a plurality of said caissons are employed, which are interconnected after being sunk.
6. A method as claimed in Claim 4, wherein the said site initially covered by water is connected by a conduit to open water.
7. A method as claimed in Claim 4, wherein the said site initially covered by water is a disused dock.
8. A method as claimed in any of Claims 4 to 7, wherein the said site initially covered by water is at least partially filled in after the said caisson(s) have been sunk thereat.
9. A method as claimed in any of Claims 4 to 8, wherein the said caisson(s) after having been sunk at the said site initially covered by water, protrude above the level of water initially covering the said site, and/or above the level of the fill of the sub seuently at least partially filled site.
iso. A purification plant constructed by a method according to any of Claims 4 to 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7706749A NL7706749A (en) | 1977-06-20 | 1977-06-20 | METHOD AND INSTALLATION FOR THE BIOLOGICAL PURIFICATION OF WASTE WATER. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1588994A true GB1588994A (en) | 1981-05-07 |
Family
ID=19828749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25916/78A Expired GB1588994A (en) | 1977-06-20 | 1978-05-31 | Biological purification of waste water |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS547766A (en) |
| BE (1) | BE867898A (en) |
| DE (1) | DE2827057A1 (en) |
| ES (1) | ES470910A1 (en) |
| FR (1) | FR2395228A1 (en) |
| GB (1) | GB1588994A (en) |
| IT (1) | IT7849870A0 (en) |
| NL (1) | NL7706749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2248057A (en) * | 1990-09-22 | 1992-03-25 | Reginald Littlejohns | Offshore aerated sewage station |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0446926A1 (en) * | 1990-03-14 | 1991-09-18 | Roediger, Walter | Apparatus for waste water clarification |
-
1977
- 1977-06-20 NL NL7706749A patent/NL7706749A/en not_active Application Discontinuation
-
1978
- 1978-05-31 GB GB25916/78A patent/GB1588994A/en not_active Expired
- 1978-06-07 BE BE188388A patent/BE867898A/en unknown
- 1978-06-14 IT IT7849870A patent/IT7849870A0/en unknown
- 1978-06-16 FR FR7818086A patent/FR2395228A1/en active Pending
- 1978-06-16 JP JP7315478A patent/JPS547766A/en active Pending
- 1978-06-19 ES ES470910A patent/ES470910A1/en not_active Expired
- 1978-06-20 DE DE19782827057 patent/DE2827057A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2248057A (en) * | 1990-09-22 | 1992-03-25 | Reginald Littlejohns | Offshore aerated sewage station |
| GB2248057B (en) * | 1990-09-22 | 1994-06-15 | Reginald Littlejohns | Marine sewage station |
Also Published As
| Publication number | Publication date |
|---|---|
| BE867898A (en) | 1978-12-07 |
| DE2827057A1 (en) | 1978-12-21 |
| JPS547766A (en) | 1979-01-20 |
| ES470910A1 (en) | 1980-02-16 |
| FR2395228A1 (en) | 1979-01-19 |
| NL7706749A (en) | 1978-12-22 |
| IT7849870A0 (en) | 1978-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |