WO2005030659A1 - Dispositif et procede pour traiter un milieu tel que des eaux usees, des boues de curage ou analogues - Google Patents

Dispositif et procede pour traiter un milieu tel que des eaux usees, des boues de curage ou analogues Download PDF

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Publication number
WO2005030659A1
WO2005030659A1 PCT/DE2004/002061 DE2004002061W WO2005030659A1 WO 2005030659 A1 WO2005030659 A1 WO 2005030659A1 DE 2004002061 W DE2004002061 W DE 2004002061W WO 2005030659 A1 WO2005030659 A1 WO 2005030659A1
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WIPO (PCT)
Prior art keywords
medium
shear
rotor
shear field
surface elements
Prior art date
Application number
PCT/DE2004/002061
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German (de)
English (en)
Inventor
Andreas Schmid
Original Assignee
Andreas Schmid
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Publication date
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Publication of WO2005030659A1 publication Critical patent/WO2005030659A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/0018—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/08—Crushing or disintegrating by disc mills with coaxial discs with vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • 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
    • C02F2303/12—Prevention of foaming

Definitions

  • the invention relates to a device and a method for treating a medium containing filamentous and flocculating microorganisms, such as waste water, sewage sludge, or the like, with at least one shear field for subjecting the microorganisms of the medium to mechanical stress.
  • the invention is also suitable, for example, for organic substrates used in biogas plants, at least for reducing or avoiding the formation of expanded sludge, floating sludge and / or foam.
  • the biomass used in the aeration tank is a mixed biocenosis of various microorganisms.
  • the mixed biocenosis contains, among other things, filamentous bacteria or filamentous bacteria and flake-forming bacteria.
  • the formation of non-sedimenting or floating sludge aggregates results in an increased growth of filamentous bacteria, which aggregate into a thread network. Such a thread mesh significantly impedes the thickening and settling process of the activated sludge.
  • the floating sludge aggregates consist mainly of expanded sludge, floating sludge and foam. Bulking sludge, floating sludge and foam can also be formed if the wastewater contains finely divided gas bubbles, hydrophobic wastewater contents and / or cell structures as well as surface-active substances.
  • a stable operation of a biological sewage treatment plant is difficult or not possible with the formation of expanded sludge, floating sludge or foam.
  • Shear fields can generate mechanical stress on long-filament structures and cause particle size reduction under high mechanical loads.
  • a shear stress is generated in a manner known per se by a pair of forces. The forces act on planes parallel to one another and act along these planes in the opposite direction.
  • the medium in the shear field is sheared laterally. Shear fields in fluids are characterized by velocity gradients between the neighboring layers. These shear fields are opposed by the viscosity of the medium, which opposes the corresponding resistance.
  • the shear stress generated In order to reduce the particle size, the shear stress generated must exceed the tensile strength of the structures, ie the solid particles, in order to cause the long-stranded structures to tear.
  • the thread-like structures are not oriented along the direction of tension of the shear field, lower shear stresses are sufficient to crush the particles, since the entered shear stresses create an overlay of shear and torsional stress and cut or torture the particles.
  • the lysed cell components released in this way act as biological flocculants, for example in the form of released cell membrane components, DNA, RNA, or the like and subsequently improve them Sedimentation properties, for example of activated sludge.
  • the microorganisms tend to agglomeration and flake formation after leaving the shear field. This has a positive effect on the subsequent sedimentation.
  • a method and a device of the type mentioned at the outset is known, for example, from DE 42 41 299 A1.
  • This known method and the device provided therefor are intended for treating liquid, such as contaminated soil material suspended in water and / or waste water, by producing a fine suspension or emulsion, the
  • Liquid is exposed to shear forces in a gap formed between a rotor arranged in an inner container and a stator.
  • the stator is formed by at least a portion of the bottom and / or the lower edge region of the inner container. The liquid is removed by the rotor from the bottom area of the inner container through those present in the stator
  • Breakthroughs driven into the bottom area of an outer container In this known method and in the device provided for this purpose, the liquid is conveyed in the circuit in a self-sucking manner through the shear field between the rotor and the stator. The energy required to drive the rotor is accordingly large. However, the energy dissipation in the fluid is insufficient.
  • DE 200 01 795 U1 describes a device for controlling sludge on biological wastewater treatment plants with at least one sludge removal / conveying device, one
  • Treatment tank with at least one inlet, a dispersing device, an outlet and a degassing opening, the floating sludge in the treating tank being crushed by the high shear force of the dispersing device and the gases contained in the floating sludge being released.
  • the energy dissipation is also unsatisfactory in this known device.
  • a shear field reactor with a number of mutually spaced and mutually parallel shear fields is known, for example, from EP 1 005 391 A1. This known Scherfeld reactor is used to produce gas-containing vesicles.
  • the invention has for its object to provide a device and a method of the type mentioned, wherein an optimal energy dissipation into the filamentous and flocculating microorganism-containing medium takes place with negligible or no medium promotion caused by the shear field.
  • the at least one shear field is determined and limited by a few surface elements, which are spaced apart from one another by a shear gap and which can be moved relative to one another by means of a drive device for generating the shear field
  • one of the surface elements for introducing the one to be treated Medium in the shear gap has at least one medium inlet, which can be connected or is connected to a feed pump for the medium, so that the device is not self-sucking when there is at least a reduction or avoidance of cavitation in the shear gap
  • at least one of the surface elements on it the inner surface facing the other surface element has a surface structuring which increases energy dissipation. Cavitation is preferably not generated.
  • the device according to the invention therefore preferably has an efficiency of at least 70%, more preferably of at least 90%.
  • Feeding pump for the medium has the advantage that the medium delivery effect is negligibly small or eliminated by the at least one shear field and the energy dissipation into the medium to be treated is optimal.
  • part of the pumping energy is converted into dissipation energy. This advantageously further increases the efficiency of the device according to the invention.
  • the wastewater preferably activated sludge or a mixed biocoenosis
  • the wastewater is subjected to a shear stress in a shear field by hydrodynamically generated shear fields.
  • the shear fields are created in the wastewater, preferably activated sludge or a mixed biocenosis, as described above.
  • the device according to the invention can therefore also be referred to as a shear field reactor.
  • the shear stress leads to a comminution or fragmentation of sludge aggregates or thread meshes formed from long-stranded microorganisms. Furthermore, trapped or adhering finely divided gas bubbles are released in these sludge aggregates. These gas bubbles contained in the untreated sludge aggregates contribute to a deterioration in the sedimentation behavior of the sludge aggregates.
  • the shear stress partially destroys the filamentous bacteria and shortens the filament length of the filamentous bacteria.
  • the stress exerted on the filamentous bacteria contained in the mixed biocenosis by the generated shear field leads in particular to changes in the metabolism of the filamentous bacteria, which leads to a change in the growth kinetics of the filamentous microorganisms or bacteria.
  • the growth of filamentous microorganisms is significantly reduced.
  • the change in the metabolism of filamentous microorganisms is due in particular to the stimulation of protective mechanisms against the stress generated by the applied shear stress.
  • the secreted extracellular polymeric substances advantageously bring about an adhesion of the sludge aggregates crushed in the shear field. This adhesion counteracts the formation of too small sludge particles, which do not sediment or sediment too slowly, and leads to an advantageous flocculation and thus to the desired sedimentation of the mixed biocenosis.
  • the relative proportions of flocculating microorganisms to filamentous microorganisms in the mixed biocenosis or sewage sludge change in favor of the flocculating microorganisms.
  • An increase in Ratio of flocculating bacteria to filamentous bacteria in the mixed biocenosis favors sedimentation of the sludge aggregates.
  • flake-forming microorganisms show good sedimentation behavior.
  • the surface elements of the pair of surface elements determining the shear field are designed as disks provided one above the other, the upper disk forming a stator and the lower disk forming a rotor which is connected to a drive motor forming the drive device is.
  • a shear field by an upper-side stator and a lower-side rotor, but, for. B. to design the device with two superimposed shear fields, wherein a stator is provided between two spaced rotors, which is spaced from the two rotors in each case by a corresponding shear gap.
  • the stator or the stators or the rotor or the rotors are preferably designed as disks.
  • the disks are preferably arranged one above the other. It is preferred that the disks form pairs of disks, the disks or disk pairs preferably being arranged horizontally. In a preferred embodiment, the surface element pairs specified below are therefore each a pair of disks.
  • the device is designed such that the / each shear field is located above the level of the medium to be treated.
  • the at least one shear field is therefore not immersed in the medium to be treated, so that the respective shear field is not self-sucking or none As already mentioned, it has a promotional effect.
  • the energy input takes place in the shear field in the medium to be treated, the energy input is optimally dissipated.
  • the disks or pairs of disks i.e. the rotor stator
  • the medium inlet is expediently connected to and opens into the stator, and the drive motor is attached under the rotor, preferably in a hanging manner.
  • the drive motor can be immersed in the medium to be treated in order to be cooled by the medium to be treated.
  • Another possibility is for the drive motor to flow around and cool the treatment medium emerging from the shear field. In the former case, the cooling is better than in the latter case.
  • the at least one shear field is above the level of the medium to be treated results in the advantage that no back pressure is generated in the medium by the shear field, so that energy dissipation into the medium to be treated is also optimal from this point of view ,
  • Another advantage is the simplified maintainability of the device.
  • the pair of surface elements can be arranged in a housing, wherein the drive motor can be attached to a base element of the housing.
  • the housing can be designed as an open or as a closed housing, which is advantageous from a safety point of view. It has proven to be advantageous if the distance between the two surface elements of the respective shear gap can be adjusted. In this way, a variable process parameter for the treatment of the medium is available.
  • the surface element forming the stator is provided such that it can be adjusted in height in relation to the surface element forming the rotor.
  • the medium inlet opening into the stator can be formed with an externally threaded section and the housing
  • the shear field formed by the stator and the rotor can be surrounded by an annular impact device, which is spaced from the peripheral edge of the stator and the rotor.
  • the impact device can have flow shear elements facing the shear gap between the stator and the rotor.
  • the impact device has a flow steering section that directs the medium against the drive motor.
  • the speed of the drive motor is adjustable.
  • the same purpose, ie the provision of variable process parameters, is useful if the volume flow and / or the delivery pressure of the charging pump can be set in the device according to the invention.
  • the diameter of the rotor and the volume flow of the feed pump influence the duration of the medium to be treated in the shear field.
  • the speed of the drive motor ie the speed of the rotor and the gap width of the shear gap, ie the distance between the stator and the rotor, predominantly determine the maximum shear gradient of the shear field.
  • the degree of energy dissipation into the medium to be treated can be decisively influenced by appropriate surface design of the rotor.
  • the rotor can therefore preferably be designed with a surface structuring.
  • This surface structuring can be formed by labyrinth-like rib sections which run radially and in the circumferential direction of the rotor.
  • at least one of the surface elements, preferably the rotor is designed with a perforation in order to influence the degree of energy dissipation into the medium to be treated accordingly.
  • the device according to the invention advantageously has a reference to the volume flow and / or the delivery pressure of the feed pump , the gap distance between the rotor and the stator, the speed of the rotor and its diameter, and the surface structure of the rotor such a variability that the mechanical load situation for the microorganisms and the hydrodynamic conditions can be covered according to the invention in a wide range.
  • This flexibility is achieved in particular by decoupling the at least one shear field from the conveying device, ie the feed pump for the medium which is separate from the shear field.
  • a throttle device is provided in a pipeline connecting the feed pump to the medium inlet of the shear field.
  • a throttle device is particularly useful when the feed pump is not variable in speed in order to be able to adjust the volume flow and / or the delivery pressure of the feed pump.
  • the housing can be designed as an open housing with a cage or as a closed housing with ventilation openings on the top and a medium outlet funnel on the underside.
  • the device can be immersed in the medium to be treated to such an extent that the shear field of the device protrudes from the mirror of the medium; in the latter case, the housing can also be immersed in the medium to such an extent that the shear field projects from the mirror of the medium.
  • Such a device with a closed housing can also be arranged free-standing. Such a closed system can be useful from a safety point of view.
  • the object on which the invention is based is achieved in the method according to the invention for the treatment of a medium containing filamentous and flocculating microorganisms, such as waste water, sewage sludge or the like, the microorganisms of the medium being present in at least one shear field which is determined and limited by a few surface elements which can be moved relative to one another, are subjected to a mechanical stress, according to the invention solved in that the medium to be treated is introduced through one of the surface elements into the shear gap with at least one reduction or avoidance of cavitation in the shear field by means of a feed pump, at least one of the surface elements on its other surface element facing inner surface has a surface structuring which increases energy dissipation.
  • a medium containing filamentous and flocculating microorganisms such as waste water, sewage sludge or the like
  • the microorganisms of the medium being present in at least one shear field which is determined and limited by a few surface elements which can be moved relative to one
  • one of the surface elements is expediently driven in rotation by means of a drive motor, so that this surface element forms a shear field rotor which is at a certain distance from a stationary immovable shear field stator.
  • the shear field is arranged according to the invention above the level of the treated medium. Surprisingly, the flake-forming bacteria are not destroyed by the process according to the invention. Furthermore, there is no significant change in the cell metabolism, so that the growth kinetics of the flocculating microorganisms are not significantly impaired or are not significantly changed.
  • the method according to the invention thus leads to an advantageous change in the composition of the mixed biocenosis.
  • This change in the bacterial composition caused by the method according to the invention therefore leads to a recovery of the sewage sludge.
  • the distance between the surface elements of the shear gap is adjustable. This adjustability can be realized in that the surface element forming a shear field stator is adjusted in height in relation to the surface element forming the shear field rotor.
  • the shear field can be surrounded by an annular impact device, which is spaced from the peripheral edge of the shear field and on which the medium emerging from the at least low-cavitation or cavitation-free shear field rebounds, whereby the mechanical stress of the medium is further increased.
  • the medium can be directed against the drive motor driving the shear field rotor by means of a flow steering section of the impact device. This makes it possible to cool the drive motor. It is preferred if the rotational speed of the drive motor for the shear field rotor can be adjusted, because in this way an adaptation to the particular conditions relating to the medium to be treated is possible. The same purpose is useful if it is possible to adjust the volume flow and / or the delivery pressure of the feed pump. To optimize the energy dissipation in the medium to be treated, it is expedient if at least one of the surface elements which define and delimit the shear field is designed with a surface structuring on its inner surface facing the other surface element. It is preferred if the rotor with such
  • This surface structuring can be formed by labyrinth-like rib sections which run, for example, radially and in the circumferential direction of the rotor.
  • the labyrinth-like rib sections can also have spiral rib structures, which can be continuous or interrupted.
  • a rotor designed in this way can be used for suspensions whose solids content is relatively low, so that there is no risk of clogging.
  • the surface structuring supports a, preferably essentially radial, shear effect, the information relating radially to the radius of the disk forming the surface element.
  • the medium to be treated is therefore preferably subjected to an essentially radial shear stress, whereby the hydrodynamic paradox, i.e. supports the desired flow reversal and thus optimizes energy dissipation.
  • the rotor can also be designed with a perforation forming the surface structure, as has already been explained above.
  • a good variability and adaptability to the given conditions is achieved if the flow rate of the medium in a pipeline connecting the feed pump to the medium inlet can be adjusted by means of a throttle device, i.e. is adjustable.
  • the invention is also suitable, for example, for particle comminution of filamentous structures, which is essential for the co-fermentation of organic raw materials.
  • the surface structure of the rotor must be dimensioned accordingly in order to keep the tendency to clog as low as possible.
  • Such a device could, for example, also be used in a processing step of the raw substrate in the biogas fermentation.
  • the device according to the invention and the method according to the invention were tested over a longer period of time for the deselection of long-stranded microorganisms from activated sludge by generating shear fields from a sewage treatment plant under practical conditions.
  • the results of these investigations show the operability of the device and the method according to the invention, i.e. Expandable and floating sludge and foam in sewage treatment plants can be at least reduced or avoided in the long term.
  • Another advantage is that the invention can be infinitely adapted to the particular requirements. That there is a wide range of effects depending on the energy input, the speed, the gap distance and the rotor geometry.
  • FIG. 1 shows a block diagram of the device in combination with a feed pump and a throttle device between the latter and the device
  • FIG. 2 shows a section through a first embodiment of the device
  • FIG. 3 shows a section through a second embodiment of the device
  • FIG. 4 shows a view of a rotor with a surface structuring of the device according to FIG. 2 or according to FIG. 3, and
  • FIG. 5 shows a diagram of the course over time of the foam volume index ISV of a sewage treatment plant which was operated during a first period without and during a subsequent second period with a device according to FIGS. 2 or 3.
  • FIG. 6 shows a simulated flow profile (velocity vectors) over the longitudinal section of the device
  • FIG. 7 shows a simulated flow profile (velocity vectors) of a shear field generated between the stator and rotating rotor in a top view.
  • FIG. 8 shows a schematic representation of the influence of the method according to the invention on the growth kinetics of flake-forming microorganisms and filamentous microorganisms
  • FIG. 1 schematically shows a device 10 for treating a medium containing filamentous and flocculating microorganisms, such as waste water, sewage sludge or the like. Formations of the device 10 are described in more detail below in connection with FIGS. 2 and 3.
  • the device 10 is connected by means of a pipeline 12 to a
  • a throttle device 16 is provided in the pipeline 12.
  • Figure 2 shows a sectional view of a first embodiment of the embodiment 10, in which the housing 18 as an open housing with a Base plate 20, a cover plate 22 and the base plate 20 with the cover plate 22 connecting cage bars 24 is formed.
  • a drive motor 26 is attached, which for a surface element 28 that forms a rotor
  • a surface element 32 which forms a stator, is provided at a distance from the rotor 28.
  • a shear field 34 is delimited and determined by the stator 32 and by the rotor 28, which is used to act on the microorganisms of a to be treated, i.e. medium supplied by the feed pump 14 to the device 10, which is in the wastewater, sewage sludge or the like, serves with mechanical stress.
  • the device 10 is immersed in a liquid, the mirror of which is designated by the reference number 36 in FIG.
  • the device 10 is immersed in the liquid to such an extent that the drive motor 26 is in the liquid in order to be cooled by it, but the shear field 34 is above the liquid level 36.
  • the shear field 34 is in any case positioned with respect to the liquid level 36 in such a way that it is at most adjacent to or positioned above the liquid level 36.
  • a medium inlet 38 for the medium to be treated opens into the shear field 34 between the stator 32 and the rotor 28.
  • the medium inlet 38 has a tubular sleeve 40 which is formed with an externally threaded section 42.
  • a ring element 44 is fastened on the cover plate 22 and has a through hole with an internal thread 46.
  • the tubular sleeve 40 is screwed with its external thread section 42 through the ring element 44, so that it is possible to set the shear gap of the shear field 34 between the stator 32 and the rotor 28 as desired.
  • a lock nut 48 secures the respective setting of the shear gap of the shear field 34.
  • the tube sleeve 40 is provided with a connecting flange 50, which serves to connect the pipeline 12 (see FIG. 1).
  • the shear field 34 formed by the stator 32 and the rotor 28 is surrounded by an annular impact device 52.
  • the impact device 52 is at a defined distance from the peripheral edge 54 of the shear field 34.
  • FIG. 3 shows an embodiment of the device 10, which differs from the device 10 according to FIG. 2 in particular in that the housing 18 is not designed as an open housing with a cage, but rather as a closed housing 18 with an upper part 56 and a lower part 58 , which each have a circumferential fastening flange 60, by means of which the upper and lower parts 56 and 58 are connected to one another to form the housing 18.
  • the upper part 56 is formed with ventilation openings 64 and the lower part 58 has an underside medium outlet funnel 66.
  • FIG. 3 The same details are denoted in FIG. 3 with the same reference numerals as in FIG. 2, so that it is not necessary in connection with FIG. 3 to describe all these details again in detail.
  • the drive motor 26 for the rotor 28 of the shear field 34 is attached to a truss device 68 which extends through the lower part 58 of the housing 18.
  • the impact device 52 surrounding the shear field 34 at a defined distance is designed with a flow-directing section 70 directed against the drive motor 26. With the aid of the flow-directing section 70, the medium which is discharged from the shear field 34 and is subjected to mechanical stress is directed against the drive motor 26 in order to effect cooling thereof.
  • the baffle 52 is also with Flow breaker elements 72 are formed to increase the stress on the medium with mechanical stress.
  • Legs 74 stand down from the lower part 58 of the housing 18 in order to be able to set up the device 10 at a suitable location.
  • FIG. 4 shows a plan view of an embodiment of the rotor 28 which is provided with a surface structuring 76 on its side facing the stator 32.
  • the surface structuring 76 is formed by iabyrinth-like rib sections 78, which run in the circumferential direction of the rotor 28, and by rib sections 80, which are oriented in the radial direction of the rotor 28.
  • the surface structuring 76 can also be designed differently.
  • Turbulence eddies in the shear field 34 are generated in particular by the vertical stomata 82. Tests have shown that there is a strong dependence of the energy input into the shear field 34 and thus a strong dependence of the energy dissipation on the respectively set horizontal gap distance between the rotor 28 and the stator 32.
  • FIG. 5 illustrates the operating data of a diagram
  • Wastewater treatment plant i.e. the temporal dependency of the foam volume ISV.
  • the foam volume index ISV is the ratio of sludge volume to sludge weight over time t in months.
  • the left area 84 illustrates an operation of the sewage treatment plant without the device 10 according to the invention, i.e. without a shear field reactor, and the right area 86 illustrates the operation of the
  • the measurements were carried out on a wastewater treatment plant with 12,000 equivalent residents.
  • the rotor drive and the Feed pumps each had an output of 4 kW.
  • the speed of the rotor was approximately 750 revolutions / minute.
  • the rotor and the stator each had a plate diameter of 480 mm, the gap distance being 4 mm between the upper edge of the ribs and the stator.
  • the stator had a smooth surface.
  • the surface of the rotor had a textured surface with rib sections, as shown in Figure 4.
  • the height of the rib sections was 18 mm.
  • Plate diameter, surface design of rotor and stator, feed quantity, feed pressure, etc. can be set independently of one another in accordance with the external framework conditions (e.g. viscosity of the waste water, mechanical resistance of the thread-like microorganisms, etc.).
  • FIG. 6 shows the flow profile in a longitudinal section through the device on the basis of speed vectors.
  • the medium flowing in the inlet 38 reaches the shear gap formed between the rotor 28 and the stator 32.
  • the rotor 28 has rib sections 80 and 78. When the rotor 28 is rotating, it occurs in the shear gap
  • FIG. 7 shows a simulated flow profile of a shear field on the basis of speed vectors between a rotating rotor 28 and stator 32 in a top view. It can be clearly seen that there is no significant acceleration of the treated medium radially outwards. This suppression of radial acceleration of what is in the shear gap
  • FIG. 8 shows the influence of the method according to the invention on the
  • FIG. 8 shows that the growth rate of flake-forming microorganisms is not, or not significantly, influenced by the method according to the invention.
  • the method according to the invention has a significant influence on the growth rate of filamentous microorganisms. Due to the shear field created in the device according to the invention, the growth of filamentous microorganisms is significantly suppressed compared to flake-forming microorganisms. This leads to a desired change in the relative composition of the mixed biocenosis. The relative ratio of filamentous microorganisms to flake-forming microorganisms is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Activated Sludge Processes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour traiter un milieu contenant des micro-organismes filamenteux et floculants, tel que des eaux usées, des matières de curage ou analogues, les micro-organismes du milieu étant soumis à une contrainte mécanique par l'intermédiaire d'au moins un champ de cisaillement (34). Selon ladite invention, le champ de cisaillement (34) est déterminé et limité par une paire d'éléments plans (28, 32), séparés l'un de l'autre par un espace de cisaillement et pouvant être déplacés l'un par rapport à l'autre au moyen d'un dispositif d'entraînement (30) pour la production du champ de cisaillement (34). Un des éléments plans (32) présente une alimentation en milieu (38) permettant d'introduire le milieu à traiter dans l'espace de cisaillement. Cette alimentation en milieu (38) est reliée ou peut être reliée à une pompe d'alimentation en milieu (14), de sorte que le dispositif (10) n'est pas auto-aspirant lorsque la cavitation dans l'espace de cisaillement du champ de cisaillement (34) est au moins réduite ou évitée. Au moins un des éléments plans (28, 32) présente, sur sa surface intérieure faisant face à l'autre élément plan (32, 28), une structuration de surface (76) augmentant la dissipation d'énergie.
PCT/DE2004/002061 2003-09-20 2004-09-14 Dispositif et procede pour traiter un milieu tel que des eaux usees, des boues de curage ou analogues WO2005030659A1 (fr)

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EP2465610A1 (fr) 2010-12-20 2012-06-20 Podwysocki Spolka Jawna Dispositif et procédé pour désintégrer des déchets liquides
EP2559479A1 (fr) * 2011-08-19 2013-02-20 J&B Marine Equipment & Service GmbH Appareil de traitement de l'eau pour supprimer des organismes et procédé de traitement d'eau de mer
CN105435931A (zh) * 2015-12-28 2016-03-30 郑州市正升重工科技有限公司 一种离心式制砂机
JP2016517791A (ja) * 2013-03-25 2016-06-20 マシネンファブリーク グスタフ アイリッヒ ゲーエムベーハー ウント コー． カーゲーＭａｓｃｈｉｎｅｎｆａｂｒｉｋ Ｇｕｓｔａｖ Ｅｉｒｉｃｈ Ｇｍｂｈ ＆ Ｃｏ．Ｋｇ 粒子調整装置
CN107890932A (zh) * 2017-08-23 2018-04-10 何丽进 一种中药材粉碎机
CN110078143A (zh) * 2019-05-16 2019-08-02 陕西中医药大学 一种微生物制药发酵废液的处理方法
JP2020203246A (ja) * 2019-06-17 2020-12-24 株式会社石垣 有機汚泥の可溶化装置および汚泥可溶化方法

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EP1985357A1 (fr) 2007-04-24 2008-10-29 Podwysocki Spolka Jawna Procédé et appareil pour le traitement de liquides sous des conditions de cavitation
EP2465610A1 (fr) 2010-12-20 2012-06-20 Podwysocki Spolka Jawna Dispositif et procédé pour désintégrer des déchets liquides
EP2559479A1 (fr) * 2011-08-19 2013-02-20 J&B Marine Equipment & Service GmbH Appareil de traitement de l'eau pour supprimer des organismes et procédé de traitement d'eau de mer
WO2013026545A1 (fr) * 2011-08-19 2013-02-28 J&B Marine Equipment & Service Gmbh Appareil de traitement de l'eau pour la destruction d'organismes et procédé pour le traitement de l'eau de mer
CN103826732A (zh) * 2011-08-19 2014-05-28 安德烈亚·格鲍尔 用于杀死有机生物的水处理设备以及处理海水的方法
CN103826732B (zh) * 2011-08-19 2016-08-17 阿奎麦德公司 用于杀死有机生物的水处理设备以及处理海水的方法
JP2016517791A (ja) * 2013-03-25 2016-06-20 マシネンファブリーク グスタフ アイリッヒ ゲーエムベーハー ウント コー． カーゲーＭａｓｃｈｉｎｅｎｆａｂｒｉｋ Ｇｕｓｔａｖ Ｅｉｒｉｃｈ Ｇｍｂｈ ＆ Ｃｏ．Ｋｇ 粒子調整装置
US10843199B2 (en) 2013-03-25 2020-11-24 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Granules conditioner
CN105435931A (zh) * 2015-12-28 2016-03-30 郑州市正升重工科技有限公司 一种离心式制砂机
CN105435931B (zh) * 2015-12-28 2017-11-21 郑州市正升重工科技有限公司 一种离心式制砂机
CN107890932A (zh) * 2017-08-23 2018-04-10 何丽进 一种中药材粉碎机
CN110078143A (zh) * 2019-05-16 2019-08-02 陕西中医药大学 一种微生物制药发酵废液的处理方法
JP2020203246A (ja) * 2019-06-17 2020-12-24 株式会社石垣 有機汚泥の可溶化装置および汚泥可溶化方法
JP7050249B2 (ja) 2019-06-17 2022-04-08 株式会社石垣 有機汚泥の可溶化装置および汚泥可溶化方法

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