WO1995025696A1 - Apparatus and process for treating waste effluent - Google Patents
Apparatus and process for treating waste effluent Download PDFInfo
- Publication number
- WO1995025696A1 WO1995025696A1 PCT/GB1995/000593 GB9500593W WO9525696A1 WO 1995025696 A1 WO1995025696 A1 WO 1995025696A1 GB 9500593 W GB9500593 W GB 9500593W WO 9525696 A1 WO9525696 A1 WO 9525696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chambers
- effluent
- chamber
- biomass
- media
- Prior art date
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
- C02F3/08—Aerobic processes using moving contact bodies
- C02F3/085—Fluidized beds
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification 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
Definitions
- This invention concerns effluent treatment apparatus and a process for treating waste effluents, and particularly but not exclusively apparatus and a process for treating waste water from a domestic or industrial source.
- biomass micro-organisms
- a biological fluidised bed in which a slime growth (biomass) develops on the surface of inert media, usually micro sized particles approximately 0.50 to 2.00 mm in diameter.
- the particles are contained within a biological reactor unit, and are
- the biological energy requirement for such systems is achieved by the transfer of electrons from donors in the waste water (carbonaceous matter) to electron acceptors (oxidants) usually dissolved atmospheric or gaseous oxygen, injected into the waste water feed.
- electron acceptors usually dissolved atmospheric or gaseous oxygen
- an anoxic process can be used whereby nitrates are added as electron acceptors to reduce the pollution strength of the waste effluent.
- a distinct advantage claimed for the biological fluidised bed process over conventional aerobic biological methods of waste water treatment is the ability to maintain a very high concentration of active biomass in contact
- apparatus for treating waste effluent comprising a plurality of chambers
- biomass may be formed, means operative to supply waste effluent to the
- the chambers are preferably alignable such that in use the effluent flows upwardly therethrough.
- the chambers are preferably alignable substantially vertical in use.
- chambers are preferably located substantially adjacent each other in use, at
- the chambers are interconnected to each other by pipework or
- the chambers are preferably constructed of suitable reinforced reinforced
- the chambers are preferably constructed in circular, square or oblong
- a plurality of interconnecting chambers of at least two
- Automatic valve means may be provided in or beyond the last of said chambers for controlling the flow of effluent passing through and out of the
- Means may be provided in or beyond the last of said chambers for
- the washing means may comprise scouring means which may use compressed air and filtered effluent for the scouring.
- Means may be provided for filtering the effluent.
- the filter means may be provided for filtering the effluent.
- the media filter may comprise a media filter and means may be provided for cleaning the
- filter media by for example reverse flushing.
- the filter means are preferably carried out by passing the effluent
- Outlet valve means may be provided in or near an upper part of one
- outlet valve means may be automatically operated to discharge any gas
- Outlet valve means may be provided in or near a lower part of one or
- Means are preferably provided for supplying dissolved oxygen or bio-
- supply means are preferably provided for a plurality of the chambers such
- Sensor means may be provided in one or more of the chambers to sense the conditions therein.
- the or each sensor means may be connectable to either of the respective upper and lower valves and/or the oxygen supply
- Means may be provided for recycling treated effluent into any chamber of the apparatus and preferably also to the upstream of said first chamber.
- a process for treating waste effluent characterised by the steps of introducing a treatment media on which biomass may be formed into at least one of a plurality of chambers which are closed to the atmosphere, supplying an oxidant to at least one of the chambers passing effluent sequentially through the plurality of chambers, and decreasing the flow velocity of the effluent in a downstream chamber as compared with the flow velocity in an upstream chamber whereby to form biomass on the treatment media and to carry biomass coated media from an upstream chamber to a downstream chamber the biomass removing pollutants from the effluent during this process.
- the flow velocity of the effluent is preferably decreased at least twice.
- the effluent is preferably passed upwardly through the chambers.
- the effluent is preferably passed through the chambers under high pressure.
- Dissolved oxygen or a bio-oxidant source is preferably supplied into at least some of the chambers and different rates of supply are preferably
- Waste gases may be removed from one or more of the chambers.
- the treated effluent is preferably settled to allow separation of heavy suspended solids.
- the treated effluent is preferably filtered and may be filtered subsequent to passing through said chambers or when passing from the final settlement chamber.
- a portion of the settled effluent passing from the final settlement chamber is preferably returned to the upstream of the first chamber to act as recycle water and for upward flow velocity regulation within the chambers.
- the effluent treatment apparatus comprises a high pressure flow control valve 27, a high pressure pump 4 and a waste water collection wet- well 2, six vertical aligned chambers 10, 12, 14, 16, 18, 20 connected together in sequence by the interconnecting pipes 26.
- the third and fourth chambers 14, 16 are of greater cross section area than the first and second chambers 10, 12.
- the fifth and sixth chambers 18, 20 are of greater cross- sectional area than the third and fourth chambers 14, 16.
- the final chamber 20 is connected to a settling and flow distribution chamber 40 which will be hereinafter described.
- Each chamber 10-20 is fitted with an inlet flow distribution system 36 designed and fitted to disperse and distribute the incoming flow evenly in an upward direction over the cross-sectional area of
- a valve 30 is provided adjacent the inlet into each of the chambers 10-20.
- the valve 30 is located at the lowermost part of the pipework 26 and permits material to be drained/removed from the apparatus and or samples to be taken.
- the interconnecting pipework 26 forming an outlet for each of the chambers 10-20 is provided at the uppermost part of the respective chambers 10-20 and connects downwardly to a respective inlet on the subsequent chambers 12-20.
- a further valve 32 is provided connecting into the uppermost part of the pipework 26 immediately downstream of the outlet from each of the chambers 10-20.
- Each valve 32 connects into gas extraction ducting 34.
- the valves 32 permit samples to be taken and also gas to be removed from the pipework 26. As the valves 32 are located at the uppermost part of the pipework 26 gases will automatically locate at this point.
- the valve 32 may be arranged to automatically bleed any gases accumulating thereat into ducting 34.
- Valve means 60 are provided for supplying an oxygen or other oxidant source such as dissolved atmospheric oxygen, dissolved oxygen gas, oxygen gas, dissolved nitrates, or other suitable bio-oxidant agents, or a combination of two or more of these components, into chambers 10 to 20.
- an oxygen or other oxidant source such as dissolved atmospheric oxygen, dissolved oxygen gas, oxygen gas, dissolved nitrates, or other suitable bio-oxidant agents, or a combination of two or more of these components
- in the chambers is kept above atmospheric preferably between 3 to 5 bar.
- oxygen supply means may be omitted from the sixth chamber 20.
- Sensors 62 may be provided for each of the chambers 10-20 to detect the conditions therein.
- the sensor signals may be transmitted via a control system 94 to the bio-oxidant supply 38 and/or units 60, 30, 32, 27 and 4 to automatically operate these as conditions dictate.
- the pipework 26 extending into settling tank chamber 40 connects to a centrally located flow baffle arrangement 42 which disperses the flow in a downward direction.
- the uppermost peripheral edge of the chamber 40 acts as a settled effluent overflow weir 44 discharging effluent into a surrounding channel 46 and pipework therefrom conveys a portion of the effluent to a media filter 70 and the remaining effluent to the waste water wet well inlet pumping sump 2 for recycle.
- Settling chamber 40 contains a lower sludge sump 48 in which settled solids accumulate. These solids can be withdrawn either mechanically, hydrostatically or pumped into a biomass/media washing and separation unit 50. Settled effluent for filtration passes from channel 46 into a media filter
- the media filter 70 preferably contains similar filtering media as is used within chambers 10 to 20 and can be designed as an upflow or downflow conventional effluent filter. Backwash water from this filter is discharged along interconnecting pipework 72 to the media washing and separation unit 50.
- the biomass/media washing and separation unit 50 is fitted with a high pressure wash water supply 52 and a compressed air supply 54 discharging into a bottom baffled media washing zone 56 of this unit into
- the high pressure washwater supply 52 and the air supply 54 can also be used for washing the media in filter 70.
- the uppermost edge of unit 50 acts as an overflow weir 80 discharging waste supernatant liquor into a surrounding channel and 10 connecting pipework 82 which conveys the supernatant liquor to the inlet wet well 2.
- a number of decanting valves and pipework 84 are fitted to unit 50 which selectively allows supernatant liquor or waste biomass solids to be withdrawn from several levels and passed either to the inlet wet well 2 or 15 progressed for treatment and disposal elsewhere.
- the cleansed media can then be pumped via a media pump 58 for reuse to the first or any of chambers I0 to 20, or as make up media for filter 70.
- Treated and filtered effluent is drained to a reservoir 90 for disposal or reuse as required.
- the treatment process and apparatus is usable in the following manner.
- start-up and commissioning chambers I0, 12 are partially filled with micro sized media particles to about 30 to 50 % by volume.
- the medium particles may be sand, fused alumina, garnet, anthracite or similar
- the waste water to be treated preferably has an active biomass inoculant added to it during the first few days and is pumped via a variable output high pressure pump 4 from a waste water wet-well sump 2 into chamber I0 at a pre-set constant flow and pressure as controlled by pressure valve 27.
- the flow rate being sufficient to fluidise the media particles and
- the inoculant may comprise batches of mixed micro-organisms taken from a local waste water treatment plant or specially prepared batches of micro-organisms pre-adapted to degrade the particular components contained within the waste water. This latter inoculant type may be necessary where volatile organics or other anti-typical industrial materials are being treated in the waste water flow, or where industrial effluents are being treated alone by this process.
- Oxygen gas or other oxidant source is injected into the ingoing waste effluent flow and preferably controlled to allow a slight excess at all times during treatment. After a period depending on the strength and nature of the waste water and the presence or otherwise of an inoculant, a biomass growth will be injected into the ingoing waste effluent flow and preferably controlled to allow a slight excess at all times during treatment. After a period depending on the strength and nature of the waste water and the presence or otherwise of an inoculant, a biomass growth will be used.
- biomass covered media particles become less dense and the overall bulk
- volume of the media increases. As the particles continue to grow and
- Chambers 14 and 16 are of greater cross sectional area than I0 and 12.
- Chambers 18 and 20 are of still larger cross sectional area than
- Chambers 18 and 20 are designed to provide sufficient biomass
- the height and volume of the respective chambers are designed to allow sufficient retention period for the facultative micro-organisms contained therein to adapt and perform their particular activities.
- the types of biomass organisms vary through the chambers I0 to 20
- the main stages being a growth phase chambers I0 and 12; a carbonaceous oxidation phase chambers 14 and
- oxygen or bio-oxidant is injected to each of the chambers 10-20 as is required.
- Sensors 32 may be supplied to automatically supply and control the required amount of oxygen or bio-oxidant to each chamber 10-20.
- An additional chamber not shown may be added in line with chambers 10-20 to which no oxygen or bio-oxidant is supplied to allow
- the treated effluent flowing from chamber 20 containing suspended biomass coated particles will pass along the interconnecting pipework 26 into settling chamber 40.
- the retention time of the flow within chamber 40 will allow the biomass coated media to settle and be collected, possibly with the help of mechanically operated floor scrapers not shown, into a lower sludge holding sump 48.
- the settled effluent from this tank overflowing the peripheral weir 44 into channel 46 and pipework therefore will preferanti ' laly flow to the inlet wet-well 2 in order to provide steady balanced upward flow velocities within
- a media filter 70 herewith shown only for explanatory purpose as a down flow gravity filter.
- Filter 70 could also be designed as a conventional upflow or a pressure filter. It would be possible depending on the quality of the final treated effluent required, to distribute a portion of the effluent from chamber 20 without settlement direct to the media filter 70 for entrapment of the biomass particles and a portion to wet-well 2 for recirculation.
- the treatment process within the chambers 10 to 20 produce gaseous end products which may cause problems in the apparatus. Accordingly these gases are removed through the valves 32 into ducting 34.
- the valves 32 are preferably in the form of automatic gas release valves to provide automatic venting.
- the biomass particles can be withdrawn through any of the valves 30 when required and passed directly to chamber 50 for cleaning.
- the system also permits different sources of oxidants to be supplied
- the biological treatment process is aerobic and entirely enclosed
- the trial was carried out using screened but unsettled domestic sewage having a biochemical oxygen demand (B.O.D.) strength of approximately 320 mg/l. and producing a final treated filtered effluent quality of less than I0 mg/l B.O.D. and 5 mg/l suspended solids.
- B.O.D. biochemical oxygen demand
- the treatment micro-organisms identified in the final zone of the 100 mm diameter reactors were: Lionatus, Euplotes, Paramecium, Vorticella,
- Aspidisca and Nemotodes All were present in an abundance with Vorticella, Paramecium and Nemotodes being the dominant types.
- the excess biomass sludge production discharged from the media washing plant is comparatively free from noxious odours and could be quickly processed into a marketable fertiliser or soil conditioner. When dried it has a consistent texture similar to dried activated sludge.
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- 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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU18998/95A AU1899895A (en) | 1994-03-19 | 1995-03-17 | Apparatus and process for treating waste effluent |
EP19950911425 EP0699173A1 (en) | 1994-03-19 | 1995-03-17 | Apparatus and process for treating waste effluent |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9405572.0 | 1994-03-19 | ||
GB9405572A GB9405572D0 (en) | 1994-03-19 | 1994-03-19 | Waste effluent treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995025696A1 true WO1995025696A1 (en) | 1995-09-28 |
Family
ID=10752250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1995/000593 WO1995025696A1 (en) | 1994-03-19 | 1995-03-17 | Apparatus and process for treating waste effluent |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0699173A1 (en) |
AU (1) | AU1899895A (en) |
GB (1) | GB9405572D0 (en) |
WO (1) | WO1995025696A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001023308A1 (en) * | 1999-09-24 | 2001-04-05 | Mohammad Taghi Daneshvar | A process and apparatus for treatment of waste water, effluent and biomass |
EP3159314A1 (en) * | 2015-10-23 | 2017-04-26 | Roland Lorch | Clarification unit, method and use |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2630118A1 (en) * | 1971-08-10 | 1978-01-19 | George Tymoshchuk | Aerobic biological treatment of sewage - by combined activated sludge and biological filter bed zones |
EP0168283A1 (en) * | 1984-06-13 | 1986-01-15 | "DEGREMONT" Société dite: | Process and fluidised-bed reactor for biological treatment, especially for the treatment of water |
EP0385555A1 (en) * | 1989-02-28 | 1990-09-05 | Tauw Infra Consult B.V. | Apparatus for carrying out a combined air and water purification, and also a method for operating such a purification |
WO1990010602A1 (en) * | 1989-03-13 | 1990-09-20 | Envirotech Corporation | Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
JPH06190790A (en) * | 1992-12-22 | 1994-07-12 | Tadao Uno | Printing unit block aligniong device |
-
1994
- 1994-03-19 GB GB9405572A patent/GB9405572D0/en active Pending
-
1995
- 1995-03-17 EP EP19950911425 patent/EP0699173A1/en not_active Withdrawn
- 1995-03-17 AU AU18998/95A patent/AU1899895A/en not_active Abandoned
- 1995-03-17 WO PCT/GB1995/000593 patent/WO1995025696A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2630118A1 (en) * | 1971-08-10 | 1978-01-19 | George Tymoshchuk | Aerobic biological treatment of sewage - by combined activated sludge and biological filter bed zones |
EP0168283A1 (en) * | 1984-06-13 | 1986-01-15 | "DEGREMONT" Société dite: | Process and fluidised-bed reactor for biological treatment, especially for the treatment of water |
EP0385555A1 (en) * | 1989-02-28 | 1990-09-05 | Tauw Infra Consult B.V. | Apparatus for carrying out a combined air and water purification, and also a method for operating such a purification |
WO1990010602A1 (en) * | 1989-03-13 | 1990-09-20 | Envirotech Corporation | Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
JPH06190790A (en) * | 1992-12-22 | 1994-07-12 | Tadao Uno | Printing unit block aligniong device |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 10, no. 262 (C - 371)<2318> 6 September 1986 (1986-09-06) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001023308A1 (en) * | 1999-09-24 | 2001-04-05 | Mohammad Taghi Daneshvar | A process and apparatus for treatment of waste water, effluent and biomass |
EP3159314A1 (en) * | 2015-10-23 | 2017-04-26 | Roland Lorch | Clarification unit, method and use |
Also Published As
Publication number | Publication date |
---|---|
AU1899895A (en) | 1995-10-09 |
EP0699173A1 (en) | 1996-03-06 |
GB9405572D0 (en) | 1994-05-04 |
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