EP2571820A1 - Bioreacteur a oxygenation et lits bacteriens separes et procede de traitement - Google Patents
Bioreacteur a oxygenation et lits bacteriens separes et procede de traitementInfo
- Publication number
- EP2571820A1 EP2571820A1 EP11727206A EP11727206A EP2571820A1 EP 2571820 A1 EP2571820 A1 EP 2571820A1 EP 11727206 A EP11727206 A EP 11727206A EP 11727206 A EP11727206 A EP 11727206A EP 2571820 A1 EP2571820 A1 EP 2571820A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- effluent
- bacterial bed
- tank
- pipe
- 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- Withdrawn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
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- 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
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- 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
- C02F3/06—Aerobic processes using submerged filters
-
- 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
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- 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
- C02F3/1226—Particular type of activated sludge processes comprising an absorbent material suspended in the mixed liquor
-
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/20—Prevention of biofouling
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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
- 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 invention belongs to the field of bioreactors for the treatment of liquid effluents, and in particular the treatment of chemical effluents.
- the present invention relates to bioreactors for the treatment of chemical effluents, which comprise fixed beds.
- bioreactors used for the biological treatment of chemical effluents include in particular fixed bed bioreactors also called biofilters or bacterial beds.
- the patent EP 0 004 528 relates to a device and a method of purification of wastewater does not produce excess sludge.
- waste water containing biodegradable materials is processed in a fixed bed reactor, and the aqueous sludges from the reactor are aerobically digested after separation with water.
- the digested sludge is returned to the reactor or upstream of the reactor.
- the water to be treated containing biodegradable substances is introduced into a bacterial bed, in which the biodegradable substances contained in the water to be treated are biologically oxidized.
- the purified water containing sludge is then transferred to a flotation vessel.
- the sludge contained in the water is brought to the surface by the action of air.
- the aqueous slurry thus separated and concentrated is introduced into a digestion vessel, and is aerobically digested by aeration through the air introduced through an air intake device from a compressor.
- the digested liquid is returned to the wastewater supply circuit of the bacterial bed by means of a pump. It is therefore a process comprising the passage into two different reactors, one fixed bed, the second allowing aeration, and the method further comprises a recirculation from one reactor to the other.
- the device described in US Pat. No. 5,518,620 allows treatment of water on a fixed bed, the material used for the fixed bed being an activated carbon fiber felt in a treatment tank.
- a circulation vessel is provided on the water circuit. Part of the treated water leaving the tank through the pipe is introduced into the circulation tank for aeration through a means of aeration (eg an air pump). The aerated water is sent through the pipe to be mixed with the untreated water and introduced into the treatment tank.
- a means of aeration eg an air pump
- the treated water can be stored in a tank and then sent to a membrane separator to filter microorganisms in the water, and obtain more purified water and "concentrated" water.
- the concentrated water 26 can be returned to the untreated water tank. This keeps the microorganisms in the treatment system.
- the wastewater treated by the device of this document is preferably industrial wastewater.
- the device described in European patent EP 0 526 590 comprises three successive bioreactors operating sequentially. There is no recirculation of the liquid to be treated from the last tank to the first. Bioreactors are fixed bed reactors. An aeration panel is provided in each bioreactor. This device is used for the treatment of textile dyeing effluents.
- the patent application US 2003/0226805 describes a wastewater treatment process comprising the steps of introducing the water to be treated into an oxygenation tank, wherein an aeration by air or an oxygen-enriched gas is realized to obtain a water enriched with oxygen; Introducing the oxygen enriched water into the bottom of a reactor containing a bed of biological activated carbon, so that the bed of activated carbon is foamed and treated water is formed in the upper part of the reactor; Filter and empty part of the treated water, and recycle another part of the water to the oxygenation tank to aerate with the water to be treated.
- the device described in this document comprises an oxygenation chamber and a recirculation of water.
- US Pat. No. 6,926,830 describes a water treatment system comprising at least one reactor.
- the reactor comprises at least a first vessel connected to a second vessel.
- support materials for biomass growth are provided in the tanks.
- Each tank has microorganisms suitable for a biodegradation step.
- a system having three tanks in hydraulic connection with each other through openings in the walls is described. Air is introduced in the form of bubbles by diffusers to provide mixing and aeration to the tanks.
- a first tank contains a slurry suitable for a bioreaction stage, grown on supports. The supports are mobile, but can be fixed if ventilation is not activated.
- a second vessel contains a second slurry suitable for another bioreaction step, grown selectively on other carriers.
- the first tank can be considered as a fixed bed bioreactor and the second tank is a bioreactor with sludge aeration. In addition a recirculation can take place between the tanks.
- Patent application WO 2009/101168 discloses a water treatment apparatus consisting of a fixed bed bioreactor, and an oxygenation tank. There is a recirculation from one tank to the other. The associated process is a batch process.
- US patent application 2009/0272689 discloses a water treatment device comprising an aeration means and a fixed bed bioreactor.
- the main vessel is divided into two sections by a wall comprising an orifice.
- the first section comprises a water aeration apparatus, the second section comprises a fixed bed bioreactor.
- the aeration section does not contain microorganisms
- the devices described above have an oxygenation vessel and a separate fixed bed digestion vessel.
- these devices, and the processing methods associated with them have the disadvantage that the fixed bed tank will show after a certain period of operation a decrease in its activity or efficiency, as well as a pressure drop. This decrease is related to the clogging of the microorganism support by sludge suspended in the effluent to be treated. Therefore, it is necessary to periodically clean the device.
- Another disadvantage of this type of device is the creation of preferential passages in the fixed bed, which reduces its efficiency.
- the present invention proposes to overcome these disadvantages through a device, and its associated operating method, easy to use, avoiding the creation of preferential passages and allowing the "unclogging" of the fixed bed without prolonged stop of the device.
- a first subject of the invention is a system for the biological treatment of liquid effluents, preferably industrial effluents, comprising a first tank called an "oxygenation tank” equipped with an aeration system and supplied with effluent via a line comprising a valve, at least two other tanks called “bacterial bed” each comprising a support microorganism support, said first tank oxygenator being connected to each of said at least two bacterial bed tanks by a pipe, divided into a supply line of the first bacterial bed effluent tank and a supply line of the second bacterial bed tank in effluent, said system further comprising an outlet pipe of the effluent of the first bacterial bed, an outlet pipe of the effluent of the second bacterial bed, said pipes being connected to a common outlet pipe of the effluent, an effluent circulation pump being placed on said common pipe, a recirculation pipe of the treated effluent leaving the bacterial bed tanks to the oxygenation tank, an evacuation pipe of the effluent treated
- the said bacterial bed tanks each comprise a level sensor, and said bacterial bed tanks are connected to each other by a pipe located in the lower part of said tanks and allowing the passage of the effluent of a tank with a bacterial bed in the other,
- said supply line of the first bacterial bed comprises a valve allowing the passage of the effluent from said oxygenation vessel to said first bacterial bed
- said supply line of the second bacterial bed comprises a valve allowing the passage of the effluent from said oxygenation vessel to said second bacterial bed
- said outlet pipe of the effluent of the first bacterial bed comprises a valve for evacuation of the effluent of said first bacterial bed, and said effluent outlet of the effluent of the second bacterial bed. comprises a valve allowing evacuation of the effluent from said second bacterial bed,
- the opening of the feed valves of the bacterial bed vats and the evacuation valves of the bacterial bed vats is controlled by control means, so as to define a circulation path of the effluent such that said effluent is goes first into the first bacterial tank and then through the connecting line between the bacterial bed tanks, and then into the second bacterial bed, or pass first into the second bacterial tank and then through the connecting line between the bacterial bed and then in the first bacterial bed.
- Another subject of the invention is a method for treating liquid effluents using the system according to the invention.
- the method comprises the steps of:
- FIGS. 1a to 1e show an embodiment of the invention in which the first and second bacterial bed cells are connected in series.
- Figure 1a is a schematic representation of the device according to the invention.
- FIGS. 1b to 1e are diagrammatic representations of the steps of the method according to the invention, in which the arrows represent the flow direction of the effluent to be treated in the device.
- FIGS. 1b and 1e show the effluent treatment process
- FIGS. 1c and 1d show the cleaning stages of the bacterial bed tanks.
- FIG. 2 represents another embodiment of the system according to the invention in which the first and the second bacterial bed vats can, as needed, operate in series or in parallel.
- FIGS. 3a to 3f are schematic representations of the method according to the invention using the device shown in Figure 2, wherein the arrows represent the flow direction of the effluent to be treated in the device.
- FIGS. 3a and 3f show the effluent treatment method, in the case where the bacterial bed tanks operate in series
- FIGS. 3b to 3e represent stages of the cleaning process of the bacterial bed vats corresponding to the series treatment. of the effluent to be treated.
- FIGS. 4a to 4c are schematic representations of the method according to the invention using the device shown in Figure 2, wherein the arrows represent the flow direction of the effluent to be treated in the device.
- FIG. 4a represents the effluent treatment process in the case where the microburst tanks operate in parallel
- FIGS. 4b to 4c show the cleaning stages of the bacterial bed cells corresponding to the parallel treatment of the effluent with treat.
- FIG. 5 represents another embodiment of the system according to the invention in which the first and the second bacterial bed tanks operate in parallel, and in which one of the tanks can operate in effluent treatment, while the other tub works in counter-wash.
- FIG. 6a to 6b are schematic representations of the method according to the invention using the device shown in Figure 5, in which the arrows represent the direction of flow of the effluent to be treated in the system.
- FIG. 6a shows the effluent treatment process
- FIG. 6b shows the effluent treatment process in the case where a bacterial bed tank operates in effluent treatment and the second bacterial bed tank operates in against-washing. List of landmarks
- biological treatment is meant the digestion of pollutants harmful to the environment and / or to the human being by appropriate microorganisms, generally bacteria, or yeasts or molds.
- FIG. 1 A first embodiment of a biological effluent treatment system according to the present invention is described with reference to FIG. 1.
- the system 1 according to the present invention comprises at least three separate treatment tanks connected to each other by pipes. .
- a first tank 2 called “oxygenation tank”, of relatively large volume, is used for at least partial oxygenation of the effluent to be treated.
- the main objective of the oxygenation of the effluent to be treated is to provide the necessary oxygen to the aerobic bacteria or microorganisms used for the biological treatment.
- the volume of the oxygenation tank 2 is between 5 and 1000 m 3 , and preferably 50 to 150 m 3 .
- the volume of the oxygenation tank is adapted according to the volume of effluent to be treated.
- the oxygenation is obtained by aeration of the effluent.
- Aeration is the process by which air flows through, is mixed with, or is dissolved in a liquid.
- the aeration of liquids is generally carried out either by passing the liquid through the air by means of fountains, cascades, impellers or cones, or by passing the air into the liquid by means of turbines. aeration or compressed air that can be combined as well as fine bubble diffusers, large bubble diffusers or linear air ducts.
- aeration is performed by passing air into the effluent to be treated.
- Aeration or oxygenation of the effluent to be treated can be done by any appropriate technique known to those skilled in the art.
- the equipment used for the aeration of the effluent to be treated can belong to three basic types: the air diffusion elements comprise, for example, a porous medium (such as a sintered tube) through which the air escapes into the mass of polluted liquid; surface aeration elements in which the oxygen transfer is carried out by high surface turbulence and liquid spraying and the submerged aeration systems in which air escapes beneath the rotating blades or vanes; a substantially submerged impeller member.
- the aeration device 2a of the oxygenation tank 2 is preferably a micro-bubbling device.
- Micro-bubbling aeration devices usually comprise either a micro-perforated tubular ramp, or a micro-perforated disc, the ramp or disc used to produce small diameter air bubbles. The objective is to guarantee a large air-water exchange surface.
- bacterial bed preferably of a volume smaller than that of the oxygenation tank 2
- biofilter preferably of a volume smaller than that of the oxygenation tank 2
- fixed bacterial bed preferably of a volume smaller than that of the oxygenation tank 2
- bacterial bed preferably of a volume smaller than that of the oxygenation tank 2
- the terms “bacterial bed”, “biofilter”, “fixed bed” and “fixed bacterial bed” are used interchangeably in the present description.
- the term “bacterial bed”, “biofilter”, “fixed bed” or “fixed bacterial bed” means a packing or substrate formed of inert porous supports having a void rate of the order of 50% (minerals, such as pozzolan, or organic polymers) on which the active mass of the micro-organisms is fixed, and through which the effluent to be treated is percolated.
- each bacterial bed vat 3.4 is typically between 2 and 100 m 3 , and preferably between 2 and 50 m 3 .
- the volume of the tanks with bacterial beds 3,4 is adapted according to the volume of effluent to be treated.
- the at least two bacterial bed vats 3,4 are in communication with the oxygenation tank 2 through a line 20 divided into a line 20a for supplying the bacterial bed 3 and a line 20b for feeding the bacterial bed tank 4.
- a valve 5 is placed on the pipe 20a.
- a valve 7 is placed on the pipe 20b.
- the supply valves 5.7 can supply simultaneously or alternatively the bacterial bed vats 3.4.
- the at least two bacterial bed vats 3, 4 are also in communication with one another via a line 18 placed near the bottom of said bacterial bed vats 3, 4.
- Each of said bacterial bed tanks 3,4 may be further provided with level 3c, 4c probes.
- Said level 3c, 4c probes have the main function of detecting or measuring the level of the effluent in each tank, in particular to control the flow direction of the effluent in the tanks 3,4 as a function of the level measured in each tank.
- Valves 15, 16 also make it possible to direct the effluent exiting from the bacterial bed vats 3, 4 or back via line 22 to the oxygenation tank 2 so that it is treated again, either in downstream discharge via line 23 to a retention tank (not shown) or to the natural environment or to a treatment unit additional (not shown), or, preferably, for a portion X% back to the oxygenation tank 2 and for the remaining portion (100-X)% to the natural environment or a holding tank or other unit of treatment.
- X is between 20 and 100.
- the recirculation of a part of the effluent is generally necessary because the oxygen content of the aqueous medium after passing through the oxygenation tank 2 is at most about 10 mg / l, this rate does not allow a sufficient depollution by the microorganisms for a single passage of the effluent in the tanks with bacterial bed 3,4.
- the recirculation rate at the outlet of the bacterial bed (X) tanks depends on the pollutant load rate present in the effluent to be treated, as well as on the destination (natural environment, basin or treatment unit) of the effluent from the effluent. system 1 according to the invention.
- the recycling of a portion of the effluent leaving the bacterial bed tanks allows the maintenance of the bacterial flora.
- the system 1 according to the invention also comprises pumps 2d, 17.
- the pump 2d is placed at the outlet of the oxygenation tank 2 in order to eliminate the sludges which decant in the oxygenation tank 2.
- the pump 17 makes it possible to circulate the effluent in the system 1 according to the invention; it is preferably placed on the outlet pipe of the tanks 3,4.
- the supports or packings of the bacterial beds 3a, 4a are preferably porous mineral materials such as diatoms, zeolites, expanded clay or not, calcined clay, shales, pozzolan.
- the supports may also be polymeric materials, such as polystyrene, or other known materials capable of supporting the growth of bacteria, such as anthracite and activated carbon.
- the preferred media are pozzolan and calcined clays, as it is the media that offers the lowest pressure drop. Zeolites can be used but have the disadvantage of being subject to attrition.
- microorganisms or bacteria used are those known to those skilled in the art, in particular for the treatment of industrial chemical effluents, and more particularly for the treatment of textile dyeing effluents.
- said oxygenation vessel 2 also contains suspended microorganisms, so that a first biotreatment is performed in the oxygenation vessel 2.
- These microorganisms may be identical to those of the bacterial beds of the tanks 3,4, and are in this case generally brought into the oxygenation tank 2 by the circulation of the effluent.
- the microorganisms present in the oxygenation tank 2 may be different from those of the bacterial bed tanks 3,4, and are in this case, they are brought from the outside of the system 1 with the effluent coming from the industrial plant emitting the effluent, and develop because the medium present in the oxygenation tank is favorable to them, or are introduced by seeding.
- control / command process of the system 1 is conventionally carried out by control means (not shown) such as a programmable logic controller, and / or a suitable computer system.
- control means such as a programmable logic controller, and / or a suitable computer system.
- the valves 5, 7, 9, 10, 15, 16 are automatically controlled by the control means.
- FIGS. 1b and 1e The treatment of the effluent is represented by FIGS. 1b and 1e.
- the supply valve 5 of the tank 3 is open when the supply valve 7 of the tank 4 is closed, and vice versa
- the outlet valve 9 of the tank 3 is open when the outlet valve 10 of the tank 4 is closed and vice versa
- the outlet valve 9 of the tank 3 is closed when the supply valve 5 of the tank 3 is open and the outlet valve 10 is closed when the supply valve 7 of the tank 4 is open.
- the tanks with bacterial bed 3,4 are fed in series, with passage of the effluent either firstly by the tank 3, as represented by FIG. 1b, or firstly by the tank 4, such as as represented by Figure 1e.
- the effluent arrives through the valve 27 in the oxygenation tank 2, leaves the tank 2 via the line 20, passes into the bacterial bed 3, the valve 5 being open and the valve 7 being closed, passes through the conduit 18 of the bacterial bed 3 to the bacterial bed tank 4, out of the bacterial bed 4 tank by the pipe 25b, the valve 10 being open and the valve 9 being closed, passes through the pipe 21, then for a part X% returns to the oxygenation tank 2 by the pipe 22, and for a portion (100-X)% leaves the system 1 by the pipe 23.
- the effluent arrives through the valve 27 in the oxygenation tank 2, leaves the tank 2 via the pipe 20, passes into the bacterial bed 4, the valve 7 being open and the valve 5 being closed, passes through line 18 of the bacterial bed 4 to the bacterial bed 3, leaves the bacterial bed 3 by the pipe 25a, the valve 9 being open and the valve 10 being closed, passes through the pipe 21, then for a part X% returns to the oxygenation tank 2 by the pipe 22, and a part (100-X)% leaves the system 1 by the pipe 23.
- the effluent to be treated passes first into the oxygenation tank 2, then successively in each bacterial bed tanks, then after passing through the last tank, X% of the effluent is recycled to the oxygenation tank 2 (X is between 20 and 100), the rest (0 to 80%) is rejected to a holding tank, to another effluent treatment system, or to the natural environment.
- the level 3c, 4c probes check the level of the effluent in the respective bacterial bed tanks 3,4 and send information to the control means of the valves to trigger if necessary the cleaning cycle and the unclogging of the packings 3a, 4a vats with bacterial bed 3,4.
- this cleaning and unclogging step is also referred to as "backwashing".
- Counter-washing is more precisely understood to mean the circulation of the effluent in countercurrent with respect to the direction in which it circulates during its biological treatment.
- this cleaning and declogging is carried out in three phases.
- the first phase is aeration phase only, in the second phase there is simultaneous aeration and inversion of the direction of passage of the effluent, the third phase is a phase of circulation of the effluent in the same direction as that of the second phase, the aeration being cut off.
- the cleaning and declogging steps detailed hereinafter concern the case where cleaning is triggered while the treatment of the effluent is done by first passing through the bacterial bed 3 then to the bacterial bed 4.
- An optional "prewash” step may be considered.
- the valves 27, 16 are closed so that the circulation of the effluent is done in a closed circuit in the system 1.
- This step aims to reduce the COD (chemical oxygen demand) of the oxygenation vessel 2
- This step is represented by Figure 1c.
- the pump 17 is shut off, the valves 5.7 are closed, the aeration device 3b of the bacterial bed 3 is in operation.
- the valves 27, 16 are closed, the valve 15 is open.
- This first phase of aeration alone is oprionnelle.
- the second phase is represented by Figure 1d.
- the aeration device 3b, of the bacterial bed 3 is in operation, the valve 16 is closed, the valve 15 is open, the inlet valve 27 of the effluent in the system 1 is closed, so that all the effluent circulates in closed circuit in the system 1.
- the supply valve 5 of the tank 3 is closed and the supply valve 7 of the tank 4 is open, and the outlet valve 9 of the tank 3 is open and the outlet valve 10 of the tank 4 is closed.
- the valve 16 is closed, the valve 15 is open, the inlet valve 27 of the effluent in the system 1 is closed, so that all of the effluent circulates in closed circuit in the system 1.
- the supply valve 5 of the tank 3 is closed and the supply valve 7 of the tank 4 is open, and the outlet valve 9 of the tank 3 is open and the outlet valve 10 of the tank 4 is closed.
- This phase is identical to the previous phase, except that the aeration of the bacterial bed 3 is cut off. It is not the subject of a specific figure. We can refer to Figure 1d.
- the cleaning and declogging cycle is preferably followed by a phase of progressive reopening of the valves 15, 16 to allow the resumption of the normal operation of the system 1 (operation in treatment mode of the effluent).
- the system 1 further comprises a conduit 26a for evacuating the effluent from the bacterial bed 3 and a conduit 26b evacuation of the effluent from the bacterial bed 4, said conduits 26a, 26b being connected to the common discharge line 21.
- Said lines 26a, 26b are further placed in the lower part of each bacterial bed 3 4.
- a valve 13 is placed on the pipe 26a and a valve 14 is placed on the pipe 26b.
- a valve 28 is placed on the pipe 18 connecting the two bacterial bed tanks 3,4.
- the system 1 according to the invention also preferably comprises a line 24a for the arrival of the effluent from the bottom of the bacterial bed 3 and a line 24b for the arrival of the effluent by the bottom of the bacterial bed 4.
- a valve 6 is placed on the pipe 24a and a valve 8 is placed on the pipe 24b.
- the valves 6, 8, 13, 14 are closed, and the valve 28 is open. The operation of the system 1 for the treatment of the effluent is then identical to that of the system described above with reference to FIG.
- the cleaning and declogging can also be performed as described above, the valves 6,8,13,14 being closed, and the valve 28 open.
- the optional pre-wash step is shown in Figure 3b.
- the backwash is represented in FIG. 3c.
- the cleaning and declogging steps detailed hereinafter concern the case where cleaning is triggered while the treatment of the effluent is done by first passing through the bacterial bed 3 then to the bacterial bed 4.
- An optional "pre-wash” step shown in Figure 3b may be considered.
- the valves 27, 16 are closed so that the circulation of the effluent is done in closed circuit in the system 1, the valves 6,8,13,14 are closed, and the valve 28 is open.
- This step aims to reduce the COD (chemical oxygen demand) oxygenation tank 2. This step is shown in Figure 3b.
- the pump 17 is shut off, the valves 5, 7 are closed, the aeration device 3b of the bacterial bed 3 is in operation.
- the valves 27, 16 are closed, the valve 15 is open.
- the aeration device 3b of the bacterial bed 3 is in operation, the valve 16 is closed, the valve 15 is open, the effluent inlet valve 27 in the system 1 is closed, so that all of the effluent circulates in closed circuit in the system 1, the valves 6,8,13,14 are closed, and the valve 28 is open.
- the supply valve 5 of the tank 3 is closed and the supply valve 7 of the tank 4 is open, and the outlet valve 9 of the tank 3 is open and the outlet valve 10 of the tank 4 is closed. .
- valve 16 In the third phase, the valve 16 is closed, the valve 15 is open, the inlet valve 27 of the effluent in the system 1 is closed, so that all of the effluent circulates in closed circuit in the system 1, the valves 6,8,13,14 are closed, and the valve 28 is open.
- the supply valve 5 of the tank 3 is closed and the supply valve 7 of the tank 4 is open, and the outlet valve 9 of the tank 3 is open and the outlet valve 10 of the tank 4 is closed. .
- Other embodiments of the declogging and cleaning of the bacterial bed tanks 3,4 are described with reference to Figures 3d and 3e.
- the valves 5,7,8,10,28,13,14 are closed, the valve 6 and the valve 9 are open.
- the effluent exits the oxygenation tank 2 through the pipe 20, and passes into the pipe 24a. It enters the bacterial bed 3 tank from the bottom and out of said tank by the pipe 25a. It then passes into the pipe 21, then returns to the oxygenation tank via line 22.
- the cleaning and declogging only relate to the bacterial bed 3.
- This embodiment can be used by example when the sludge content of the effluent to be treated is low, which is relatively common in the case of the treatment of industrial effluents.
- the resumption of treatment is done by progressively opening the valves 16 and 27, closing the valve 6 and opening the valve 7, so that the flow direction of the effluent is reversed compared to before cleaning and declogging .
- valves 5,7,28,13,14 are closed, the valves 6,8,9,10 are open.
- the effluent exits the oxygenation tank 2 through the pipe 20, and passes into the pipe 24a and 24b. It enters simultaneously into the bacterial bed tanks 3 and 4 at the bottom and exits said tanks through lines 25a and 25b. It then passes into line 21 and then returns to the oxygenation tank via line 22.
- the resumption of treatment is done by progressively opening the valves 16 and 27, closing the valves 6,8,10 and opening the valve 7, so that the flow direction of the effluent is reversed compared to before cleaning and unclogging.
- FIGs 4a to 4c show another embodiment of the treatment of the effluent in the system 1 according to the invention as shown in Figure 2, the treatment being "in parallel”.
- valves 13, 14 are open simultaneously.
- the valves 5.7 are also open simultaneously, and the valves 9, 10 are closed simultaneously.
- Part of the effluent to be treated from the oxygenation tank 2 arrives via the pipe 20a at the top of the bacterial bed 3, then leaves the bacterial bed 3 by the pipe 26a and the pipe 21.
- the other part of the effluent to be treated from the oxygenation tank 2 arrives via the pipe 20b at the top of the bacterial bed 4, then out of the bacterial bed 4 by the pipe 26b and the pipe 21.
- the biotreatment is done in parallel in the two bacterial bed tanks 3,4, and not sequentially or " in series "as previously described.
- the parallel mode of operation has a lower efficiency than the operating mode called "in series" and described with reference to Figures 3a to 3f. It may however be used, for example, in cases where the COD (chemical oxygen demand) objectives of the effluent leaving the system 1 are not very high, for example when said effluent is reprocessed after its exit from the system 1.
- COD chemical oxygen demand
- a cleaning and unclogging mode different from that described above can be used for the embodiment of the system 1 described with reference to Figure 2.
- the cleaning comprises the same three steps as previously described.
- An optional "prewash” step shown in Figure 4b may be considered.
- the valves 27, 16 are closed and the valve 15 is opened so that the circulation of the effluent is done in a closed circuit in the system 1, the valves 6, 8, 9, 10 are closed, and the valves 13 , 14 are open.
- This step aims to reduce the COD (chemical oxygen demand) of the oxygenation vessel 2.
- the first optional step is a single aeration step in which the pump 17 is stopped and the devices 3b, 4b are in operation (this step is not shown).
- the aeration devices 3b, 4b are in operation, the valve 16 is closed, the valve 15 is open, the inlet valve 27 of the effluent in the system 1 is closed , so that all of the effluent circulates in closed circuit in the system 1.
- the valves 5, 7 are closed, the valves 6, 8 are open, the valves 9, 10 are open, the valves 13, 14 are closed.
- the flow direction of the effluent is therefore reversed relative to the direction of circulation in normal operation, so as to unclog and remove the preferential passages in the bacterial beds 3a, 4a.
- the aeration devices 3b, 4b are stopped, the valve 16 is closed, the valve 15 is open, the inlet valve 27 of the effluent in the system 1 is closed, so that all of the effluent circulates in a closed circuit in the system 1.
- the valves 5, 7 are closed, the valves 6, 8 are open, the valves 9, 10 are open, the valves 13, 14 are closed.
- the pipe connecting said bacterial bed vats 3, 4 also makes it possible to evacuate the effluents from each of said vats 3, 4 via a common line. 21b.
- the system 1 further comprises a pipe 22b provided with a valve 32 and connected to the pipe 22, and a pipe 23b provided with a valve 31.
- the evacuation of the effluent leaving the bacterial bed vats 3.4 can be carried out in different ways. It can be done by gravity, and in this case, when it is desired to pass the effluent of a bacterial bed tank in the other, either the valves 31, 32 are closed or an additional valve can be provided on the common pipe 21b, this valve is then closed.
- the evacuation can also be done, as in the system 1 shown in FIG. 5, by actuating a pump 30, and in this case, when it is desired to pass the effluent from a bacterial bed. in the other, either the valves 31, 32 are closed or an additional valve can be provided on the common pipe 21b, this valve then being closed, or said pump 30 is stopped.
- treatment of the effluent using the system 1 shown in FIG. 5 can be done in the same manner as in the case of the series operation described for the system 1 represented by FIGS. 1a and 1b, ie the effluent arrives through the valve 27 in the oxygenation tank 2, leaves the tank 2 via the pipe 20, passes into the bacterial bed 3 through the pipe 20a, the valve 5 being open and the valve 7 being closed, passes through the pipe formed by the segments 26a, 26b, 21b of the bacterial bed 3 to the bacterial bed tank 4, leaving the bacterial bed 4 through the pipe 25b, the valve 10 being open and the valve 9 being closed, passes through the pipe 21, then a part X% returns to the oxygenation tank 2 through the pipe 22, and for a part (100-X)% leaves the system 1 by the pipe 23.
- treatment of the effluent using the system 1 shown in FIG. 5 can be done in the same manner as in the case of parallel operation described for the system 1 shown in Figure 2, ie: the valves 13,14 are open simultaneously. The valves 5.7 are also open simultaneously, and the valves 9, 10 are closed simultaneously. Part of the effluent to be treated from the oxygenation tank 2 arrives via the pipe 20a at the top of the bacterial bed 3, then leaves the bacterial bed 3 by the pipe 26a and the pipe 21.
- Fig. 6b further shows an embodiment in which the bacterial bed 3 is used for treating the effluent, while the bacterial bed 4 undergoes a cleaning and declogging cycle.
- the valves 6, 7, 9, 34, 16 are closed, the valves 5, 8, 10, 13, 15, 31, 32, are open.
- the effluent arriving from the oxygenation tank 2 passes into the pipe 20a and into the pipe 24b.
- Part of the effluent enters the bacterial bed 3 from the top through line 20a and exits at the bottom through line 26a and 21b.
- a portion is sent recirculating to the oxygenation tank 2 through the pipe 22b and the pipe 22, the other part is discharged outside the system 1 by the pipe 23b.
- an evacuation of sludge tanks 3,4 to a basin or a buffer tank placed downstream of the system 1 can be provided.
- This can be useful if the quantity of sludge produced is large (for example greater than 200 kg per 500 m 3 of treated effluent).
- the volume of this buffer tank will generally be between 10 and 100 m 3 .
- the system 1 according to the invention comprises more than two bacterial bed cells.
- the effluent to be treated passes first into the oxygenation tank 2, then successively into each of the bacterial bed tanks, then after passing through the the last tank, X% of the effluent is recycled to the oxygenation tank 2 (X is generally between 20 and 100), the rest (0 to 80%) is discharged to a holding tank, to another system of effluent treatment, or to the natural environment.
- the effluent to be treated passes first into the oxygenation tank 2, then at the same time in all the bacterial bed tanks, then X% of the effluent is recycled to the oxygenation tank 2 (X is generally between 20 and 100), the remainder (0 to 80%) is discharged to a tank of retention, to another effluent treatment system, or to the natural environment.
- the present invention also relates to an effluent treatment method using the system 1.
- the method comprises the steps of:
- the backwash cycle comprises the successive steps of:
- step j) close the valve 5 and the valve 10 and open the valve 7 and the valve 9, so as to reverse the flow direction of the effluent in the tanks 3,4, if step h) was omitted, close the valve 27 and the valve 16 and completely open the valve 15, if the step i) was carried out, turn on the pump 17, or, if the step i) was omitted, put into operation the system of aeration 3b of the bacterial bed 3,
- step I the treatment process is done with the valve 10 and the valve 5 closed, and the valve 7 and the valve 9 open, that is to say that the passage of the effluent is reversed with respect to step a) described above.
- the effluent passes first through the tank 4 and then through the tank 3.
- the backwash cycle comprises the successive steps of:
- step j) close the valve 5, the valve 10, the optional valve 28 and open the valve 6 and the valve 9, so as to reverse the direction of passage of the effluent in the tank 3, and cut off the circulation of the effluent in the tank 4, if step h) was omitted, close the valve 27 and the valve 16 and completely open the valve 15, if step i) was carried out, turn on the pump 17, or, if step i) has been omitted, put into operation the aeration system 3b of the bacterial bed 3, k) stopping the aeration system 3b of the bacterial bed 3 and continue the circulation of the effluent,
- the backwash cycle comprises the successive steps of:
- step j) close the valve 5 and open the valve 9 and the optional valves 6 and 8, so as to simultaneously feed the tanks 3.4 from the effluent, if step h) was omitted, close the valve 27 and the valve 16 and completely open the valve 15, if step i) was performed, turn on the pump 17, or, if step i) was omitted, put into operation the aeration system 3b of the bacterial bed 3,
- the operating time between two cycles of cleaning and declogging system 1 is typically between 24 and 48 hours.
- the effluent treatment process comprises the steps of:
- the backwash cycle comprises the successive steps of:
- step f) closes the valve 5 and the valve 7, open the valve 9, the valve 10 and the optional valves 6 and 8, close the valves 13, 14, so as to simultaneously feed the tanks 3.4 from the effluent, if step f) has been omitted, close the valve 27 and the valve 16 and open the valve 15 completely, if step g) has been carried out, turn on the pump 17, or, if the step g) has been omitted, put into operation the aeration system 3b of the bacterial bed 3, i) stop the aeration system 3b of the bacterial bed 3 and the aeration system 4b of the bacterial bed 4, and continue the circulation of the effluent,
- the operating time between two cycles of cleaning and declogging of the system 1 is typically between 24 and 48 hours.
- the method comprises the steps of:
- the method comprises the steps of:
- Plastic substrates can be used for specific effluent applications resulting from chemical processes and treatments aimed at reducing the content of dangerous substances in water (micropollutants).
- Carbon supports (graphite, activated carbon) can also be used.
- the backwashing time is reduced, or the backwashing can take place in masked time.
- the reduction of the COD during the use of the system according to the invention is greater than that of the existing systems.
- Biomass is protected from accidental destruction by the different tanks. Accidental destruction may be due to a significant increase in the temperature of the effluent entering the oxygenation tank, a change in pH, which becomes too low or too high, the presence of strong oxidizing products or other bactericidal products.
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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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biological Treatment Of Waste Water (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1002091A FR2960159B1 (fr) | 2010-05-18 | 2010-05-18 | Bioreacteur a oxygenation et lit bacterien separes. |
PCT/FR2011/000298 WO2011161329A1 (fr) | 2010-05-18 | 2011-05-17 | Bioreacteur a oxygenation et lits bacteriens separes et procede de traitement |
Publications (1)
Publication Number | Publication Date |
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EP2571820A1 true EP2571820A1 (fr) | 2013-03-27 |
Family
ID=43304627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11727206A Withdrawn EP2571820A1 (fr) | 2010-05-18 | 2011-05-17 | Bioreacteur a oxygenation et lits bacteriens separes et procede de traitement |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2571820A1 (fr) |
FR (1) | FR2960159B1 (fr) |
WO (1) | WO2011161329A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6088419B2 (ja) * | 2013-12-24 | 2017-03-01 | 三菱重工業株式会社 | 海水の前処理装置 |
CN103833187B (zh) * | 2014-03-20 | 2015-03-25 | 湖州荣恒不锈钢有限公司 | 复合污水过滤器 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS603873B2 (ja) | 1978-03-31 | 1985-01-31 | 東レ株式会社 | 水処理方法 |
JPS60212292A (ja) * | 1984-04-06 | 1985-10-24 | Shinko Fuaudoraa Kk | 汚水の高度処理装置 |
US4810386A (en) * | 1988-01-04 | 1989-03-07 | Zimpro/Passavant Inc. | Two-stage wastewater treatment |
GB9009205D0 (en) | 1990-04-24 | 1990-06-20 | Mcdonald Alistair J | Process and apparatus for biological treatment of effluent |
JPH0487688A (ja) * | 1990-07-31 | 1992-03-19 | Meidensha Corp | 生物活性炭処理塔の洗浄方法 |
JPH06170384A (ja) * | 1992-12-10 | 1994-06-21 | Meidensha Corp | 生物活性炭処理塔の洗浄方法および洗浄装置 |
JP3107950B2 (ja) | 1993-07-07 | 2000-11-13 | オルガノ株式会社 | 生物処理装置、及び同装置を用いた水処理方法 |
US20030226805A1 (en) | 2002-06-06 | 2003-12-11 | Industrial Technology Research Institute | Method of wastewater treatment with biological active carbon using recycled oxygen-enriched water and apparatus used therein |
US6926830B2 (en) | 2002-06-28 | 2005-08-09 | Kingsford Environmental (H.K.) Ltd. | Combined activated sludge-biofilm sequencing batch reactor and process |
EP2215023A1 (fr) * | 2007-10-15 | 2010-08-11 | Seprotech Systems Incorporated | Technologie intégrée de traitement de l'eau |
ITMI20080243A1 (it) | 2008-02-15 | 2009-08-16 | C S A S R L | Impianto e processo per la depurazione di acque di scarico |
CA2630328A1 (fr) | 2008-05-02 | 2009-11-02 | Richard Ladouceur | Appareil d'aeration de liquide et appareil de traitement des eaux usees |
-
2010
- 2010-05-18 FR FR1002091A patent/FR2960159B1/fr not_active Expired - Fee Related
-
2011
- 2011-05-17 EP EP11727206A patent/EP2571820A1/fr not_active Withdrawn
- 2011-05-17 WO PCT/FR2011/000298 patent/WO2011161329A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2011161329A1 (fr) | 2011-12-29 |
FR2960159B1 (fr) | 2012-12-07 |
FR2960159A1 (fr) | 2011-11-25 |
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