EP1663877A2 - INSTALLATION DE TRAITEMENT AEROBIE D’UN LIQUIDE PAR MISE EN MOUVEMENT DE PARTICULES SUPPORTANT DES MICROORGANISMES AVEC DECANTATION ET DEGAZAGE - Google Patents
INSTALLATION DE TRAITEMENT AEROBIE D’UN LIQUIDE PAR MISE EN MOUVEMENT DE PARTICULES SUPPORTANT DES MICROORGANISMES AVEC DECANTATION ET DEGAZAGEInfo
- Publication number
- EP1663877A2 EP1663877A2 EP04786296A EP04786296A EP1663877A2 EP 1663877 A2 EP1663877 A2 EP 1663877A2 EP 04786296 A EP04786296 A EP 04786296A EP 04786296 A EP04786296 A EP 04786296A EP 1663877 A2 EP1663877 A2 EP 1663877A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- main tank
- installation according
- liquid
- installation
- wall
- 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.)
- Withdrawn
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
- C02F3/22—Activated sludge processes using circulation pipes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
- the present invention relates to the general technical field of aerobic biological treatment of liquids by activated sludge, in particular the field of biological treatment of waste water.
- the present invention relates to an installation for the aerobic treatment of a liquid by setting in motion of particles supporting microorganisms.
- the invention also relates to the use of such an installation for the purification of waste water.
- Industrial and urban wastewater must be treated and decontaminated in treatment plants before it can be discharged into the natural environment. In order to comply with current regulatory and environmental provisions and in anticipation of those to come, reducing the volumes of water treatment by-products constitutes one of the major challenges to be met in the field of water treatment.
- Wastewater treatment processes using activated sludge with a view to eliminating both carbon and nitrogen pollution according to an oxidation and sometimes nitrification / denitrification process by making the water stay in a basin of activated sludge before being subjected to a clarification, prove to be particularly interesting since they make it possible to eliminate this pollution by creation of biomass. Numerous devices and installations for treating waste water by biological means have thus been developed.
- Decantation zones have thus been provided in order to separate the particles entrained by the treated liquid, said zones being able to be placed under the main reactor or in a secondary reactor and independent of the main reactor.
- Such devices thus require a particle recycling system constituted by tubes and conduits fitted with pumps in order to return said particles to the main treatment reactor.
- These additional means add to the cost price of such installations and are not always satisfactory.
- such devices do not provide a simple and effective degassing system making it possible to separate the air bubbles entrained by the treated liquid or by the particles loaded with biomass before discharging the treated liquid.
- the present invention fulfills this need.
- the Applicant has thus discovered a new installation for the aerobic treatment of a liquid by biological means, making it possible to efficiently treat waste water of very diverse natures, such as effluents, in particular the nitrogenous materials of these waters, in a compact reactor, can be arranged in modular form, and very simple to operate and implement.
- the installation according to the present invention which comprises a tank main and a side structure attached to the main tank and arranged in a specific way allows to obtain an optimal activity of the biomass fixed on the support particles and thus to obtain high yields of treatment and purification in the reactor.
- the presence of the lateral structure attached to the main tank thus makes it possible to maintain a large quantity of bacteria in the treatment reactor by avoiding the evacuation of the particles necessary for treatment with the treated water, without causing hydraulic disturbances. within the main tank, and to separate the air bubbles entrained with the treated water without causing hydraulic disturbances within the lateral structure.
- the present invention thus relates to an installation for the aerobic treatment of a liquid by setting in motion particles (14) supporting microorganisms, comprising at least one reactor comprising:
- “at least one lateral settling and degassing structure (5) having: a common vertical wall (9) with at least part of the main tank, an inclined bottom wall (12) so as to allow the particles to fall towards the lower zone of the lateral structure (5) at the level of which is formed in said common wall, a communication opening (4) with the main tank (1), the inclined bottom wall (12) extending at its upper end, vertically upwards, by an end wall (11) provided with at least one liquid discharge chute (8), • at least one vertical partition (10) for separation extending parallel to said common wall (9), whose end.
- the cross section of the upward circulation chamber (s) (2) has an area at least equal to half the total area of the cross section of the main tank ( 1).
- the inclined bottom wall (12) has, with respect to the horizontal, an angle between 30 and 50 °, advantageously about 40 °.
- the lateral decantation and degassing structure (5) contains one or more additional vertical partition (s) (10 ').
- said one or more additional vertical partition (s) (10 ') is (are) fully submerged in the liquid.
- said one or more additional vertical partition (s) (10 ') protrude (s) above the level of the liquid.
- the lower edge of the communication opening (4) between the main tank (1) and the lateral structure (5) is located above the level of the bottom of the main tank (1), in the lower part of the latter.
- the lower edge of the communication opening (4) between the main tank (1) and the lateral work (5) is located at a distance of between 20 cm and 100 cm from the bottom of the main tank (1).
- the spacing formed between the lower part of one or more vertical partition (s) (10, 10 ′), relative to the inclined bottom wall ( 12), corresponds substantially two to three times the height of the communication opening (4) between the main tank (1) and the side structure (5).
- the communication opening (4) between the main tank (1) and the lateral work (5) has a height of between 20 cm and 100 cm, advantageously extending over the entire width of the lateral structure (5), for a common wall height (9) of 5 m to 6 m, for a common wall surface (9) of 15 m 2 to 20 m 2 or for a volume of main tank (1) from 50 m 3 to 80 m 3 .
- the installation comprises at least one reactor arranged in modular form.
- the installation comprises at least two reactors according to the present invention, in order to increase the processing capacity of the installation, the reactors being placed side by side or facing each other.
- the present invention also relates to the use of an installation according to the present invention for the purification of waste water.
- FIG. 1 is a schematic sectional view of an aerobic treatment reactor for a biological liquid according to a first embodiment of the invention, which comprises a main tank (1) comprising a submerged upward circulation chamber (2) open at its upper and lower ends and two adjacent peripheral downward circulation chambers (3), the chambers of circulation (2) and (3) being separated by vertical walls, and the lower part of said upward circulation chamber (2) being provided with an air injection device (13); as well as a lateral decantation and degassing work (5) having a common vertical wall (9) with one of the edges of the main tank (1), an inclined bottom wall (12) so as to allow the particles to fall (14) towards the lower zone of the lateral structure (5), a communication opening (4) with the main tank (1), an end wall (11) provided with a discharge chute (8) , a vertical partition (10) for separation extending parallel to said common wall (9), thus defining at least one degassing zone (6) on
- Figure 2 is a schematic cross-sectional view of a modular embodiment according to the present invention in which two treatment reactors are arranged side by side.
- Figure 3 is a schematic cross-sectional view of a modular embodiment according to the present invention in which two treatment reactors are contiguous vis-à-vis by the outer wall of the main tank (1).
- Figure 4 is a schematic cross-sectional view of a modular embodiment according to the present invention in which two treatment reactors are contiguous by the end wall (11) of the lateral structure (5) .
- the device according to the present invention makes it possible to treat various types of urban or industrial wastewater, in particular pollution of nitrogenous origin from these waters.
- the installation according to the present invention makes it possible to effectively carry out nitrification treatments according to which the ammoniacal nitrogen is oxidized in the form of nitrates.
- the incoming effluent can arrive by gravity or by pumping at the top of the main tank (1).
- the incoming effluent can also arrive from the bottom of the installation by a pressure injection at the bottom of the main tank (1).
- a main tank comprising at least two zones or circulation chambers, being able to communicate between them, separated by one or more partition (s) preferably vertical (s) ).
- the main tank (1) of the reactor is compartmentalized in two, thus defining an ascending circulation chamber (2).
- a descending circulation chamber (3) the circulation chamber descending (3) being advantageously located on the side opposite to the lateral decantation and degassing work (5) and at the communication opening
- the main tank (1) of the reactor is cylindrical with a vertical axis.
- cylindrical is meant in the sense of the present invention a surface generated by a generator which moves parallel to a fixed direction by pressing on a fixed plane profile perpendicular to the given direction.
- the base of the main tank (1) can be in different forms, such as the square, rectangular, or circular shape.
- the lateral structure (5) according to the present invention is advantageously arranged all around the main tank, concentrically.
- the perimeter of the base of the main tank (1) is square or rectangular.
- the base of the main tank (1) has a flat bottom, making it possible, in the event of stopping of the air, to store by decantation the particles (14) in a regular manner on the bottom of the then easily recirculate the particles when restarting the injection of air into the reactor.
- An air injection device (13) in the form of bubbles is arranged in the immediate vicinity of the lower part of the upward circulation chamber (s) (2), preferably in the vicinity of the bottom of said chamber (s) (s) of ascending circulation (2) and in the center of this (s).
- a venturi system can for example be used to allow the direct introduction of atmospheric air into the upstream circulation chamber (s) (2).
- the introduction of air by a compressor or a blower into the upward flow of the liquid to be treated can also be used with or without a venturi.
- This air injection device (13) makes it possible both to ensure the circulation of the solution to be treated, thus allowing the suspension of the carrier particles of microorganisms and to supply the oxygen necessary for the biological treatment.
- the injection of air into the main tank (1) thus induces a co-current circulation, permanent and orderly, of the three liquid, gaseous and solid phases in the reactor, under the effect of the driving force resulting from the bubbles d 'air says effect of "Air Lift".
- the biomass is thus permanently in contact with the air bubbles by undergoing the orderly movement of the flow of liquid to be treated.
- the air injection rate is.
- the circulation speed of the air flow in the ascending (2) and descending (3) circulation chambers is advantageously between 0.014 and 0.037 m / s.
- the cross section of the upward circulation chamber (s) (2) has an area at least equal to half of the total area of the cross section of the main tank (1).
- the main tank (1) contains granular particles (14) of small diameter advantageously between 0.05 and 2 mm, even more advantageously between 0.05 and 0.5 mm.
- the particles (14) have a density greater than 1, advantageously greater than 2, even more advantageously between 2 and 3.
- the granular support according to the present invention is advantageously a material of volcanic origin such as basalt and pozzolan, or can also be sand, or even clay.
- the volume of particulate material introduced into the main tank (1) of the treatment reactor is between 0 and 15% of the volume of the main tank (1).
- the installation according to the present invention makes it possible to maintain a large amount of biomass on the particulate material and to control the thickness of the biofilm created on said material.
- the thickness of the biofilm can be adjusted by varying the speed of circulation of the flow in the main tank (1) via the gas injection rate in the upward circulation chamber (2).
- the permanent circulation of the support in the installation according to the present invention makes it possible to ensure an efficient transfer of material between the biomass and the liquid to be treated.
- the liquid to be treated being introduced either from above or from below into the main tank (1), it emerges from said main tank (1) through the communication opening (4) towards the lateral work (5) attached to the main tank.
- a fraction of the carrier particles of microorganisms and . air bubbles is entrained at the same time as the liquid outside the main tank (1) towards the lateral structure (5) for settling and degassing.
- the lateral settling and degassing structure (5) according to the present invention thus allows the seeded particles to settle in the stilling zone (7) to return to the main treatment tank (1) and to the entrained air bubbles d '' be confined in the degassing zone (s) (6) to separate the treated liquid from these air bubbles.
- the gas released in the compartment (s) (6) and (7) can be recovered and possibly reused for aerobic treatment of liquid by reinjecting this gas into the main tank (1).
- the evacuation of the treated liquid is done via the evacuation chute (s) (8) after passage through the stilling (7) and degassing (6) zones which allow the treated liquid to be separated from the seeded support particles. and air bubbles that have been entrained in the side structure.
- the discharge chute (s) (8) may be parallel or perpendicular to the end wall (11). The evacuation is carried out by overflow and the treated liquid is then sent to the natural environment or to a finishing work of the filter type if necessary.
- the geometry and the configuration of the lateral structure (5) make it possible to obtain a tranquilization zone (7), also called decantation zone, subjected to a stable and little disturbed hydraulic and aeraulic regime.
- the settling zone (7) is lined with a mass of lamellae, commonly used by those skilled in the art, making it possible to facilitate the sedimentation of granular particles in this zone.
- the inclined bottom wall (12) of the lateral structure (5) for settling and degassing has, with respect to the horizontal, an angle of between 20 and 75 °, advantageously between 30 and 50 °, and even more advantageously about 40 °.
- the angle of this wall (12) thus makes it possible to ensure a rapid fall of the particles from the settling zone (7) towards the bottom of the main tank (1).
- the value of the angle presented by the inclined bottom wall (12) of the lateral structure (5) with the horizontal can naturally lead to a mirror surface, outside the degassing zone, which makes it possible to obtain hydraulic speeds upward of the order of 0 to 0.015 m / s. -.
- the lateral structure (5) for settling and degassing contains one or more additional partition (s). separation vertical (s) (10 '), which can be fully immersed in the liquid and / or which can protrude above the liquid level.
- the lateral decantation and degassing structure (5) contains at least two additional vertical separation partitions (10 ′), which protrude above the level of the liquid.
- the number of additional vertical partition walls (10 ') and their configuration in the degassing zone (6) depends on the flow of air and water flows in the lateral structure (5) and is chosen so as to favor optimal degassing.
- the lower edge of the communication opening (4) between the main tank (1) and the lateral structure (5) is located above the level of the bottom of the main tank (1), in the lower part of the latter, in particular in order to limit the risks of entrainment of large air bubbles in the lateral structure (5).
- This embodiment thus makes it possible to avoid partial or total blockage of the communication opening (4) which can sometimes occur when the lower edge of the commumcation opening is located at the bottom of the main tank and in case of accidental shutdown of the air injection device (13).
- the lower edge of the communication opening (4) between the main tank (1) and the lateral work (5) is located at a distance between 20 cm and 100 cm, preferably between 30 and 80 cm, more preferably between 50 and 70 cm, from the bottom of the main tank (1).
- the spacing formed between the lower part of one or more vertical partition (s) (10, 10 ′), relative to the inclined bottom wall (12) corresponds substantially to two to three times the height of the communication opening (4) between the main tank (1) and the lateral structure (5).
- the communication opening (4) between the main tank (1) and the lateral work (5) has a height of between 20 cm and 100 cm, preferably between 30 and 80 cm, so still preferable between 50 and 70 cm, advantageously extending over the entire width of the lateral structure (5), for a common wall height (9) of 5 m to 6 m, for a common wall surface (9) from 15 m 2 to 20 m 2 or for a main tank volume (1) from 50 m to 80 m 3 .
- the installation comprises at least one reactor arranged in modular form.
- the main tank (1) can be attached to a single lateral structure (5) for settling and degassing (FIG.
- the installation comprises at least two reactors according to the present invention, the reactors being arranged side by side (FIG. 2) or opposite (FIGS. 3 and 4).
- the reactors are arranged side by side, the two reactors are juxtaposed one next to the other, the different walls of each reactor being respectively arranged on the same axis.
- each reactor has only one lateral decantation and degassing structure and the reactors are then paired in pairs with each other on the side opposite the wall provided with the lateral structure or on the side of the lateral structure. In this latter configuration, the reactors are always in even number.
- An installation according to the present invention comprises a reactor comprising a main tank (1) of rectangular base having respective sides of 3 and 4 m and a height of 7 m, provided with an upward circulation chamber (2), two adjacent downward flow chambers (3), and an air injection device (13) in the form of bubbles formed in the immediate vicinity of the lower part of said upward flow chamber (2) injecting air at a flow rate of 500 m 3 / h, the cross section of the upward circulation chamber (2) having an area of 6 m 2 and the cross section of the main tank (1) having a total area of 1. 2 ; .
- a lateral decantation and degassing work (5) having an inclined bottom wall (12) having an angle to the horizontal of 50 °, a vertical partition (10) of separation defining in the lateral work a zone of degassing (6) on the side of the main tank and a cooling zone (7) on the other side, and an additional vertical partition wall (10 ') fully immersed in the liquid, the partitions (10) and (10' ) being separated by 1 m.
- the lower edge of the communication opening (4) between the main tank (1) and the lateral structure (5), formed in the common wall (9), is located at a distance of 50 cm from the bottom of the tank main (1).
- the communication opening (4) between the main tank (1) and the lateral structure (5) has a height of 50 cm, extending over the entire width of the lateral structure (5), for a height of common wall (9) of 5 m.
- Such an installation was used to purify an effluent of municipal origin, the gross starting COD of which was 150 to 250 mg / 1 and having a nitrogen content of 25 to 60 mg / 1. After two weeks of operation, the filtered COD was between
- Example 2 The present study was carried out with different reactors according to the present invention in order to measure the treatment performance with respect to nitrogen, but also filtered COD, present in the water to be treated.
- the first tests were carried out with a cylindrical installation with a circular base with a diameter of 600 mm and a water height of 5 m. Supplied with carbon-free water taken from the station outlet, the reactor filled with material eliminated maximum nitrogen volume loads of 3.0 kgN / m 3 . j.
- the second series of tests was carried out with a pilot reactor of square section 0.7 x 0.7 m and a water height of 4 m.
- the third series of tests was performed with a rectangular base pilot reactor having respective sides' of 3 and 4 m and a height of about 6 m.
- the reduction in filtered COD is on average 1kg COD / m 3 .
- the average nitrogen nitrogen loads are 0.6 ⁇ 0.2 kg N / m 3 . j.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0309824A FR2858814B1 (fr) | 2003-08-11 | 2003-08-11 | Installation de traitement aerobie d'un liquide par mise en mouvement de particules supportant des microorganismes, avec decantation et degazage |
PCT/FR2004/002124 WO2005016834A2 (fr) | 2003-08-11 | 2004-08-11 | Installation de traitement aerobie d’un liquide par mise en mouvement de particules supportant des microorganismes avec decantation et degazage |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1663877A2 true EP1663877A2 (fr) | 2006-06-07 |
Family
ID=34112715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04786296A Withdrawn EP1663877A2 (fr) | 2003-08-11 | 2004-08-11 | INSTALLATION DE TRAITEMENT AEROBIE D’UN LIQUIDE PAR MISE EN MOUVEMENT DE PARTICULES SUPPORTANT DES MICROORGANISMES AVEC DECANTATION ET DEGAZAGE |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1663877A2 (fr) |
FR (1) | FR2858814B1 (fr) |
WO (1) | WO2005016834A2 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5858192A (ja) * | 1981-10-01 | 1983-04-06 | Kyoritsu Yuki Kogyo Kenkyusho:Kk | 廃水処理方法 |
JPH0490894A (ja) * | 1990-08-03 | 1992-03-24 | Mitsubishi Kakoki Kaisha Ltd | 廃水処理用微生物担体及び廃水処理方法 |
FR2707183B1 (fr) * | 1993-07-06 | 1995-09-01 | Dumez Lyonnaise Eaux | Procédé de mise en mouvement de particules supports de microorganismes dans un liquide à traiter par voie biologique, et installation de mise en Óoeuvre du procédé. |
US6036863A (en) * | 1994-07-21 | 2000-03-14 | Brockdorff; Knud Peter | Reactor for use in water treatment and micro film carriers for use in connection with said treatment as well as a method for operating the reactor |
JP3648700B2 (ja) * | 1998-05-29 | 2005-05-18 | ニチアス株式会社 | 流動床式生物膜処理装置 |
-
2003
- 2003-08-11 FR FR0309824A patent/FR2858814B1/fr not_active Expired - Lifetime
-
2004
- 2004-08-11 WO PCT/FR2004/002124 patent/WO2005016834A2/fr active Application Filing
- 2004-08-11 EP EP04786296A patent/EP1663877A2/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005016834A2 * |
Also Published As
Publication number | Publication date |
---|---|
FR2858814A1 (fr) | 2005-02-18 |
WO2005016834A3 (fr) | 2005-04-14 |
WO2005016834A2 (fr) | 2005-02-24 |
FR2858814B1 (fr) | 2006-11-24 |
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