WO2008046431A1 - Dispositif de CLArification Biologique - Google Patents

Dispositif de CLArification Biologique Download PDF

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Publication number
WO2008046431A1
WO2008046431A1 PCT/EP2006/009975 EP2006009975W WO2008046431A1 WO 2008046431 A1 WO2008046431 A1 WO 2008046431A1 EP 2006009975 W EP2006009975 W EP 2006009975W WO 2008046431 A1 WO2008046431 A1 WO 2008046431A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve seat
line
valve
outlet
clarifier according
Prior art date
Application number
PCT/EP2006/009975
Other languages
German (de)
English (en)
Inventor
Thorsten Vogt
Original Assignee
Atb Umwelttechnologien Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atb Umwelttechnologien Gmbh filed Critical Atb Umwelttechnologien Gmbh
Priority to PCT/EP2006/009975 priority Critical patent/WO2008046431A1/fr
Priority to DE112006004075T priority patent/DE112006004075A5/de
Publication of WO2008046431A1 publication Critical patent/WO2008046431A1/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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • C02F3/1247—Small compact installations for use in homes, apartment blocks, hotels or the like comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a biological clarifier with at least one clarification chamber and a submerged pump arranged in the clarification chamber for the treatment of wastewater.
  • sewage treatment plants are often used. Apart from the actual clarification chamber, they usually also comprise at least one pre-clarification chamber upstream, which serves to separate coarse matter and store it. From the primary clarification chamber, the wastewater is introduced into the actual clarification chamber for biological clarification using the SBR method (Sequencing Batch Reactor), which is known as such. In this case, the contents of the clarification chamber must be aerated and mixed from time to time. The purified wastewater is removed by suitable pumping equipment in a clear water outlet. Furthermore, it may prove necessary to remove excess sewage sludge from the clarifier.
  • SBR method Sequencing Batch Reactor
  • EP 1 388 524 A1 shows a plant in which only a single submersible pump is arranged in the clarification chamber, which takes over the aeration, the sludge recirculation and clear water discharge.
  • solenoid valves which are shut off or opened according to the respective pump function.
  • Such valves are prone to failure and cause a certain maintenance and monitoring effort to ensure proper operation of the system.
  • EP 1 650 169 A1 shows a clarifier in which the submersible pump is connected on the pressure side to a sludge return line, from which a branch line branches off to the clear water outlet.
  • the sludge recirculation line is closed after the discharge of a surge of water or sewage sludge. If the pump is operated for a long time, clear water can subsequently be discharged into the outlet. The mixing and ventilation function must, however, be taken over by an additional submersible fan.
  • the object of the present invention is therefore to provide a biological clarifier of the type mentioned, which manages with a reduced number of components and in which in particular the number of parts requiring maintenance and failure-prone parts is reduced, so that the entire system cost and low Effort can be operated trouble-free.
  • the clarifier according to the invention comprises only a single submersible pump in the clarifier, which is connected to the inlet of a directional control valve with two outlets.
  • the first outlet is connected to a mixing line which opens again into the clarification chamber and can be used to mix the contents of the clarification chamber by the submersible pump pumping the wastewater contained therein through the mixing line.
  • a second outlet of the directional valve is connected to a drain line, which opens into a clear water outlet.
  • the proposed system also comes only with a single submersible pump, but beyond requires only a single valve, namely the directional control valve, which is switchable between the first and second outlets according to the desired function.
  • the first outlet In mixed operation, that is to say in the case of the above-described pumping of the clarification chamber contents through the mixing line, the first outlet is open, while the second outlet is closed. Conversely, the first outlet is closed when discharging the clear water. Since this switching and Abstellfunktion is taken over by a single valve, which can be optionally controlled by the pressure conditions at his EinlaJ3, further control devices may be unnecessary, as they must be required in the prior art to different solenoid valves in different line sections coordinate. As a result, a trouble-free and maintenance-free operation is possible.
  • the arrangement of the submersible pump with the connected directional control valve is thus limited to the essential functions of mixing and aeration of the clarifier content and clear water -Ab promotion, while other functions such as in particular the supply of wastewater from the primary chamber into the clarifier by very simple design Facilities such as an overflow can be adopted.
  • a connecting line opens into the mixing line, the free end of which opens into the primary clarification chamber.
  • This connecting line is preferably used for sucking wastewater and / or air from the primary clarification chamber.
  • the necessary suction pressure is also built up by the submersible pump.
  • the flow cross sections in the mixing line and in the connecting line are to be dimensioned so that at a sufficient flow pressure in the mixing line according to the Venturi principle sewage, air or an air-waste water mixture is sucked through the connecting line and conveyed into the mixing line.
  • the free end of the connecting line comprises a bell-shaped float whose lower edge is located below the waste water level of the primary chamber and which has at least one opening at a height above its lower edge.
  • a floating body can control whether air or sewage is sucked from the primary chamber. If the float is filled to a level above its opening, only waste water is sucked. If the opening is above the water level, air is sucked in.
  • the up and down movement of the float is limited by an upper and a lower stop in the primary clarification chamber.
  • the floating body floats on the surface, the opening being below the water level due to its own weight in the state filled with water (suction of waste water). If the float reaches the lower stop when the level drops further, it can not move further down, so that the level drops below the level of the opening and air is sucked in. As a result, the weight of the float is reduced so far that the opening is raised above the wastewater surface and only air is conveyed.
  • the connecting line empties, and the pe- gel in the primary clarification chamber only rises when further wastewater is filled into the primary clarification chamber from the outside or from an upstream second primary clarification chamber. The float then finally reaches the upper stop until the level rises above the opening and, during the mixing operation of the pump, fills the floating body, so that the discharge from the primary clarification chamber into the clarification chamber can begin again.
  • the connecting line is also provided for returning sludge from the clarification chamber into the primary clarification chamber.
  • This can be done with switched-off submersible pump by the sludge is sucked on the principle of a communicating tube through the mouth of the mixing line in the connecting line and flows back into the primary chamber in a free slope.
  • the level in the clarification chamber must be higher than in the pre-clearing chamber, which however is due to the process by the suction during filling of the clarification chamber the case.
  • a sludge return line which opens into the pretreatment chamber, starts from the discharge line.
  • this can be done a surge recycling of sewage sludge with open drain line, whereupon the discharge of clear water takes place in the clear water outlet.
  • FIG. 1 shows an embodiment of the biological clarifier according to the invention in a schematic cross section
  • FIGS. 2 to 4 are illustrations of the process sequence during the aspiration from the primary clarification chamber into the clarification chamber of the clarifier from FIG. 1;
  • Figures 5 and 6 are side sections through various embodiments of a directional control valve of the biological clarifier according to the invention.
  • Fig. 7 is a detail view of the clarifier according to the invention comprising a pressure equalizing line on the discharge line.
  • the biological clarifier shown in FIG. 1, which is designated in its entirety by the reference numeral 10, comprises a pretreatment chamber 12 arranged on the right in the FIGURE and a clarification chamber 14 which are arranged within a common cylindrical container 16 which extends through a cover 18 is closed with an access 20.
  • the pre-treatment chamber 12 and the clarification chamber 14 are separated from each other by a partition 22.
  • a waste water inlet 24 is arranged, through which wastewater is introduced into the pre-treatment chamber 12.
  • a submersible pump 28 is arranged, which is immersed at least with its suction side 30 in the wastewater.
  • a directional control valve is connected, which is shown schematically in the figure and generally designated 34. While the inlet of the directional valve 34 to the pressure side 32 of the submersible pump 28 is closed, a first outlet 36 of the directional control valve 34 is connected to a so-called mixing line 38, the free mouth 40 is below the water level. The remaining second outlet 42 of the directional valve 34 is connected to a drain line 44, which opens into the clear water outlet 26.
  • the directional control valve 34 is switchable between two positions, between a first position in which the first outlet 36 is opened and the second outlet 42 is closed and thus the mixing line 38 is free, and a second position in which the first outlet 36 is closed and in which can be pumped through the open second outlet 42 in the drain line 44. Switching between the two positions takes place according to a cycle of the clarification method which will be described in more detail below.
  • the free end 50 of the connecting line opens into the pre-treatment chamber 12 and includes a bell-shaped float 52 with openings that can be located above or below the wastewater level in the primary chamber 12 so that through the connection line 48, water, air or a water-air mixture can be sucked into the mixing line 38 via the dividing wall 22.
  • the term "bell-shaped" is intended to describe in the present context only a hollow, open at the bottom mold and include, for example, a cylindrical shape or the like. Structure and function of the float 52 will be described below in more detail.
  • FIGS. 2 to 4 a charging and aeration phase of the clarifier 10 will be described with reference to FIGS. 2 to 4.
  • the emptying line 44 closed during these phases is not shown for the sake of clarity.
  • the first outlet 36, to which the mixing line 38 is connected, is open.
  • an upper stop 56 and a lower stop 58 are attached to the partition wall 22, which limit the up and down movement of the floating body 52.
  • the level of wastewater within the primary chamber 12 is significantly higher than in the clarification chamber 14 and is above the upper stop 56. Due to the buoyancy of the float 52 this remains hanging on the upper stop 56 and can not move further up.
  • the floating body 52 has a number of openings 62. If the floating body 52 is completely filled with water, the openings 62 are all below the water level, so that further water is drawn in through the connecting line 48.
  • the floating body 52 thus controls due to its buoyancy and the arrangement of the openings 62 in connection with the stops 56,58 the charging cycle in which wastewater from the primary chamber 12 is conveyed into the clarification chamber 14.
  • the minimum water level in the pre-treatment chamber 12 is determined by the position of the lower stop 58. If the water level in the primary clarification chamber 12 at the beginning of a feed cycle is higher than in the clarification chamber 14, as shown in FIG. 2, this has the advantage that even after switching off the submersible pump 28 according to the principle of the communicating tubes automatically and without energy Water from the pre-treatment chamber 12 is sucked in until the flow is interrupted by the ingress of air or the water levels have become equal.
  • the first charge is thus carried out after a settling and pumping down phase, since at this time the water level in the primary clarification chamber 12 is generally higher than in the clarification chamber 14 and thus after a brief intake and mixing phase the submerged pump 28 is stopped can, so that wastewater from the primary chamber 12 can be performed without energy consumption in the clarification chamber 14.
  • the feed cycle is relatively short compared to the period of time provided for subsequent aeration.
  • the submersible pump 28 can be turned off for a time adapted to the utilization of the clarifier 10 so that excess sludge is returned to the pre-treatment chamber 12 after a short intake and mixing phase becomes.
  • the mixing operation is restarted so that the water level in the pre-treatment chamber 12 falls to the minimum level, air is introduced and the communicating tube in the connecting line 48 is interrupted.
  • a sludge recirculation according to this principle can not take place if no sewage has flowed into the pretreatment chamber 12 after a pumping-off operation. This can occur, for example, if the operator temporarily does not use the small wastewater treatment plant 10 due to absence. Since no sludge growth takes place in this case due to the lack of nutrients for the microorganisms, this is an advantage of the system.
  • sludge recirculation usually takes place by pumping operations, which must be controlled by the system controller. In this case, errors can occur which are avoided by the small wastewater treatment plant 10 according to the invention.
  • Switching between the opening and closing states of the first outlet 36 and the second outlet 42 can be realized in a particularly advantageous manner by a directional control valve 34, as illustrated, for example, in FIG. 5.
  • This directional control valve 34 comprises a relative to the horizontal plane inclined tube 70, in the lower end 72 in a starting position a ball 74 rests, which constitutes a valve body.
  • the inner diameter of the tube 70 is sized so that the ball 74 can be carried freely therein.
  • the starting position is determined by a stop 76 at the lower end of the tube 70, on which the ball 74 rests.
  • This end 72 is connected to the pressure side of the submersible pump 28 and represents the inlet of the valve 34.
  • the upper tube end 78 is narrowed and forms a valve seat 80, which is closed by the ball 74.
  • a secondary line 82 which is vertical and a second valve seat 84 in the form of a taper of the cross section of the secondary line 82 comprises.
  • a float 86 is arranged, which can move freely through the second valve seat 84 therethrough.
  • Fig. 5 shows the directional control valve 34 in a non-pressurized position in which no flow pressure is generated by the submersible pump 28.
  • the ball 74 is then due to its own weight on the stop 76 in its rest position.
  • Both valve seats 80,84 are open.
  • the submersible pump 28 starts, a volumetric flow and a flow pressure are generated in the directional valve 34, which drives the ball 74 to the upper end of the pipe 78 and closes the first valve seat 80.
  • the second valve seat 84 is opened, and the water sucked by the submersible pump 28 can flow through the pipe 70 and through the secondary pipe 82.
  • the upper first valve seat 80 forms the first outlet 36 of the directional valve 34, while the lower second valve seat 84 forms the second outlet 42.
  • the mixing line 38 is closed while the discharge line 44 is open.
  • the first valve seat 80 may also form the second outlet 42, while the second valve seat 84 represents the first outlet 36.
  • the directional control valve 34 When the submersible pump 28 is turned off, the directional control valve 34 is de-energized, and the ball 74 may roll down within the tube 70 and release the first valve seat 80. It falls or rolls until the branch of the secondary line 82 in a position from which it is pressed by a renewed flow pressure, which is built up by the submersible pump 28 when switched on again, by pushing down the float 86 against the second valve seat 84 and here a second closure position occupies, in which the first valve seat 80 is opened. If the submersible pump 28 is switched off again, the float 86 drives the ball 74 gradually back up into a position from which it can automatically go back to its rest position on the stop 76 by its weight.
  • the first valve seat 80 and the second valve seat 84 can be closed successively by first setting up the submersible pump 28 to exert pressure on the ball 74 against the first valve seat 80 in order to be used in the present connection type the first valve seat 80 forms the first outlet 36 and the second valve seat 84, the second outlet 42 to promote sewage through the drain line 44, then the submersible pump 28 is briefly turned off, so that the ball 74 may fall back to the secondary line 82 to at subsequent restarting the submersible pump 28 down to be pressed into the second valve seat 84 for closing it. That is, the directional control valve 34 may be operated to immediately follow a purging cycle with a charge and aeration cycle.
  • an aeration cycle may be started first.
  • the duration of the first pump surge is advantageously to be dimensioned so that no sewage sludge mixture accidentally gets into the drain line 44.
  • External switching devices are not provided, and the directional control valve 34 is controlled exclusively by the inlet-side pressure built up by the submersible pump 28.
  • Fig. 6 shows an alternative embodiment of such a directional control valve 90.
  • This also includes an inclined tube 70, at its lower inlet-side end 72, a stop 76 is provided which determines the rest position of a ball 74 as a valve body, as in the already previously described embodiment.
  • the upper end 78 of this tube 70 represents the first valve seat 80.
  • the secondary line 92 which branches off at the bottom of the tube 70, however, is formed by a tube which is angled slightly upwards relative to the horizontal and with the tube 70 an acute Includes angle. The end of the secondary line 92 forms the second valve seat 84.
  • the tubes 70,92 are connected by a connecting pipe section 94 which is approximately perpendicular and connects the tubes 70,92 to a triangle.
  • Ball 74 is pressed from the rest position along the tube 70 in the upper first valve seat 80 and closes it, as in the previously described embodiment. If the flow pressure drops, the ball 74 can roll back into the connecting line 94 and fall into the secondary line 92. When the pump 28 starts again and generates a flow pressure, the ball 74 is pressed into the lower second valve seat 84. If the submersible pump 28 is switched off again, the ball 74 automatically rolls back into its rest position thanks to the inclination of the secondary line 92.
  • the switching from the emptying operation to the loading and venting by the submersible pump 28 already described in a connection type is possible, in which the first valve seat 80 represents the first outlet 36 and the second valve seat 84, the second outlet 42 which is connected to the drain line 44.
  • FIG. 7 shows an alternative embodiment of an emptying line 44, to which a branch line for pressure equalization and for optional sludge recirculation is connected in the pre-clarification chamber 12.
  • This variant is useful in systems without hydraulically separate Vorteilhunt 12, in which the wastewater in a free fall through openings or via an overflow of the partition wall 22 from the primary chamber 12 flows into the clearing chamber 14.
  • this branch line is a vertical tube 100 having a check valve 104 in a lower portion 102, which is formed by a valve seat 106 and a ball 108 disposed therebelow, which rests in the open valve position on a stop 10 1.
  • a float 1 14 can be arranged in the tube 100, which is movable up and down in accordance with the level in the clarification chamber 14.
  • Through an opening 1 16 in the tube wall above the check valve 104 can ensure that within the tube 100, the same water level prevails as in the clarifier 14.
  • Above the opening 116 is a switch 1 18, which is actuated when the level so far sinks that the float 1 14 with its lower end to the switch 1 18 encounters. As a result, a function can be triggered, such as the renewed supply of wastewater from the primary clarification chamber 12.

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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)
  • Activated Sludge Processes (AREA)

Abstract

L'invention concerne un dispositif (10) de clarification biologique qui présente au moins une chambre de clarification (14) et une pompe immergée (28) disposée dans la chambre de clarification (14) pour le traitement d'eaux usées, caractérisé en ce que le côté de refoulement de la pompe immergée (28) est raccordé à l'entrée d'une soupape de passage (34, 90) dotée de deux sorties dont une première sortie (36) est raccordée à un conduit de mélange (38) qui débouche dans la chambre de clarification (14) et une deuxième sortie (42) est raccordée à un conduit (44) de vidange qui débouche dans une sortie (26) d'eau clarifiée.
PCT/EP2006/009975 2006-10-16 2006-10-16 Dispositif de CLArification Biologique WO2008046431A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2006/009975 WO2008046431A1 (fr) 2006-10-16 2006-10-16 Dispositif de CLArification Biologique
DE112006004075T DE112006004075A5 (de) 2006-10-16 2006-10-16 Biologische Klärvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/009975 WO2008046431A1 (fr) 2006-10-16 2006-10-16 Dispositif de CLArification Biologique

Publications (1)

Publication Number Publication Date
WO2008046431A1 true WO2008046431A1 (fr) 2008-04-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/009975 WO2008046431A1 (fr) 2006-10-16 2006-10-16 Dispositif de CLArification Biologique

Country Status (2)

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DE (1) DE112006004075A5 (fr)
WO (1) WO2008046431A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012101516U1 (de) * 2012-04-24 2013-07-26 Atb Umwelttechnologien Gmbh Biologische Klärvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023939A1 (fr) * 1994-03-04 1995-09-08 Dutek Wastewater Purification Pty. Ltd. Vanne d'aeration de boues et alternativement de remuage de boues par manipulation d'un tube d'embranchement dans une conduite
DE202004020436U1 (de) * 2004-10-05 2005-07-07 Baumann, Markus Biologische Klärvorrichtung
EP1591424A1 (fr) * 2004-04-29 2005-11-02 Markus Baumann Station d'épuration biologique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023939A1 (fr) * 1994-03-04 1995-09-08 Dutek Wastewater Purification Pty. Ltd. Vanne d'aeration de boues et alternativement de remuage de boues par manipulation d'un tube d'embranchement dans une conduite
EP1591424A1 (fr) * 2004-04-29 2005-11-02 Markus Baumann Station d'épuration biologique
DE202004020436U1 (de) * 2004-10-05 2005-07-07 Baumann, Markus Biologische Klärvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012101516U1 (de) * 2012-04-24 2013-07-26 Atb Umwelttechnologien Gmbh Biologische Klärvorrichtung

Also Published As

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