KR102477698B1 - Advanced wastewater treatment system with high efficiency - Google Patents

Abstract

The present invention relates to a high-efficiency advanced wastewater treatment system with improved cleaning efficiency, and more particularly, to a support frame, a plurality of separation membrane modules installed side by side at regular intervals inside the support frame, and spraying air bubbles to the separation membrane module. It includes a washing unit for detaching adhered foreign substances.
According to the present invention as described above, it is possible to easily separate the foreign substances filtered through the membrane, so that the separation efficiency as well as the lifespan can be increased, thereby improving work efficiency.

Description

Advanced wastewater treatment system with high efficiency}

The present invention relates to a high-efficiency wastewater treatment system, and more particularly, it is possible to effectively remove foreign substances caught in a separation membrane to improve the separation efficiency, and to improve the wastewater treatment efficiency by a separation membrane unit with improved separation efficiency. It relates to a separation membrane unit that can be used and a high-efficiency wastewater treatment system using the same.

In general, methods for water treatment of sewage or wastewater, heavy water, rainwater, contaminated seawater, etc. are largely divided into physicochemical methods and biological methods.

All of the physicochemical methods have disadvantages such as being uneconomical, generating secondary pollutants, and not being able to perform final treatment. In order to solve the problem of physicochemical treatment, interest in economical biological treatment methods that do not generate secondary pollutants has increased.

In the case of the biological treatment method, nitrogen removal is performed through a nitrification process that converts nitrogen compounds in wastewater into nitrate nitrogen under an aerobic atmosphere and a denitrification process that reduces nitrate nitrogen into nitrogen gas under an anoxic atmosphere, and phosphorus removal is anaerobic. Phosphorus is released by the metabolic activity of microorganisms in the aerobic state, and the microorganisms ingest excessive phosphorus in an aerobic state, and then remove it as sludge.

In this biological treatment method, membrane separation is sometimes used to increase the water treatment effect.

Membrane separation process, which mainly uses separation membranes such as submerged hollow fibers, flat membranes, and membranes, is a technology for purifying wastewater by applying separation membranes with fine pores. By preventing the loss of microorganisms necessary for purification and maximizing the biological treatment capacity, the treatment speed is increased compared to the general process. In addition, it can be applied without significant change to the existing biological sewage treatment process, and has the advantage of easy automation and simple operation.

However, over time, foreign substances such as sludge or suspended matter are attached to the surface of the separation membrane, and the attached foreign substances reduce the filtration rate and thereby reduce the treatment capacity. In this way, when the separation membrane is contaminated, an increase in internal pressure and a decrease in permeate amount due to a concentration polarization phenomenon occur, causing a problem in that the use cycle of the separation membrane is shortened.

As part of a method for solving this problem, an ultrasonic cleaning method is used. Korean Patent Registration No. 10-1008016 discloses a water treatment device including an ultrasonic cleaning unit that cleans sludge attached to the sludge separation membrane by generating ultrasonic waves toward the sludge separation membrane.

The water treatment device has the advantage of being able to remove sludge attached to the separation membrane by ultrasonic waves, but since the position of the ultrasonic cleaning unit that generates ultrasonic waves is fixed, a dead zone where ultrasonic waves do not reach is widely generated, so that the effect of removing sludge by ultrasonic waves is There is a downside problem. In addition, when there is a change in water level, there is a problem in that ultrasonic waves cannot be irradiated in response to the change in water level.

Accordingly, the present invention has been made to solve the above problems, and a plurality of separation membrane modules installed side by side at regular intervals inside the support frame, and spraying bubbles to desorb foreign substances attached to the separation membrane module It is desirable to provide a separation membrane unit capable of improving work efficiency by increasing the lifespan as well as the separation efficiency by easily separating foreign substances filtered on the separation membrane, including a washing unit for the separation membrane, and a high-efficiency advanced wastewater treatment system using the same. It is purpose.

The present invention for achieving the above object, a support frame, a plurality of separation membrane modules installed side by side at regular intervals on the inside of the support frame, and a washing unit for removing foreign substances attached to the separation membrane module by spraying air bubbles, include

Preferably, the support frame includes a pair of side walls spaced left and right, at least one upper support bar provided on the upper side of the pair of side walls, and at least one lower support bar provided on the lower side of the pair of side walls, includes

In addition, the separation membrane module has an upper header and a lower header that are fixed in a state in which they are spaced apart in the vertical direction by a support bar, and a separation membrane having an empty interior to allow liquid to pass through. The upper portion of the separation membrane is coupled to the upper header, and the separation membrane The lower part of is coupled to the lower header, the upper header is hollow inside, the upper end of the separation membrane is inserted into the empty interior, and a connector connected to the collecting pipe is formed in the upper header, and the upper part of the collecting pipe is An outlet connected to the suction line is formed.

In addition, the washing unit has a first washing lower frame and a first washing upper frame parallel to the direction in which the plurality of separation membrane modules are arranged, and the first washing frame provided in front of the support frame, the plurality of separation membrane modules It has a second washing lower frame and a second washing upper frame parallel to the direction in which they are arranged, a second washing frame provided on the rear surface of the support frame, and provided between the first washing frame and the second washing frame to each of the respective washing frames. It moves between the membrane modules and includes a bubble ejection unit for spraying bubbles to remove foreign substances, a washing movement unit for raising and lowering the bubble injection unit, and a washing control unit for controlling the bubble injection unit and the cleaning movement unit. .

And the bubble injection unit is formed at regular intervals along the upper end of the injection frame positioned between two adjacent separation membrane modules, and injects air bubbles upward to float solid foreign substances in the water to be treated to be sucked into the separation membrane module. A first spray nozzle for dispersing foreign matter by spraying air bubbles at an upward slope toward the spray film formed at both corners of the upper end of the spray frame, a second spray nozzle formed at both corners of the lower end of the spray frame to form a spray film A third injection nozzle for dispersing foreign substances by injecting air bubbles downward, a gas supply unit for supplying compressed gas to the injection frame, and the first and second injection nozzles for supplying the compressed gas to the gas supply unit. , and a spray valve controlled by the washing control unit to supply any one or more of the third spray nozzles.

In addition, the washing control unit controls the injection valve to supply the gas supplied from the gas supply unit to the first injection nozzle when the injection frame is located below the membrane module, the first washing mode, the washing movement unit When the injection frame is moved upward by the second washing mode for controlling the injection valve to supply the gas supplied from the gas supply unit to at least one of the first injection nozzle and the second injection nozzle, and the washing When the injection frame is moved downward by the copper section, a third washing mode for controlling the injection valve to supply the gas supplied from the gas supply unit to at least one of the first injection nozzle and the third injection nozzle. .

Further, the washing moving part has a screw thread along an outer circumferential surface, and a washing rotation rod provided to be idling in the first lower washing frame and the first upper washing frame, and provided in the second lower washing frame and the second upper washing frame. A washing guide rod, a first movable block having a screw thread corresponding to the thread of the washing rotating rod, provided at one end of the spray frame to move up and down along the washing rotating rod, and a washing guide rod provided at the other end of the spray frame It includes a second moving block for moving up and down along, and a washing moving motor for rotating the washing rotating rod.

In addition, an anaerobic tank for removing nitrate nitrogen from the water to be treated flowing in from the flow control tank, an anaerobic tank to release phosphorus using microorganisms in the water to be treated from the anoxic tank, and an anaerobic tank under aeration conditions. A contact aeration tank for nitrifying nitrogen by contacting a carrier immobilized with microorganisms, a membrane separation tank in which the separation membrane unit according to any one of claims 1 to 7 is installed inside for solid-liquid separation of the water to be treated flowing from the contact aeration tank, the separation membrane It includes a phosphorus removal means for removing phosphorus in the effluent that is separated from the sludge and discharged by the.

As described above, according to the separation membrane unit according to the present invention and the advanced wastewater treatment system using the same, it is possible to easily separate the foreign substances filtered in the separation membrane, so that the separation efficiency as well as the lifespan can be increased to improve work efficiency. It is a very useful and effective invention.

1 is a view showing a separation membrane unit according to the present invention;
2 is a diagram showing a separation membrane module according to the present invention;
3 is a view showing a bubble spraying unit and a cleaning moving unit according to the present invention;
4 is a view showing a washing mode of a washing control unit according to the present invention;
5 is a diagram showing an advanced wastewater treatment system using a separation membrane unit according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the accompanying drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details for the purpose of providing a thorough understanding of the present invention. However, those skilled in the art to which the present invention pertains understand that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device.

Throughout the specification, when a part is said to "comprising" or "including" a certain element, it means that it may further include other elements, not excluding other elements, unless otherwise stated. do. Also, the term "... unit" described in the specification means a unit that processes at least one function or operation. Also, "a or an", "one", "the" and similar related words in the context of describing the invention (particularly in the context of the claims below) Unless indicated or otherwise clearly contradicted by context, both the singular and the plural can be used.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the embodiment of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram showing a separation membrane unit according to the present invention, FIG. 2 is a diagram showing a separation membrane module according to the present invention, and FIG. 3 is a diagram showing a bubble spraying unit and a cleaning movement unit according to the present invention, 4 is a view showing the washing mode of the washing controller according to the present invention, and FIG. 5 is a view showing the advanced wastewater treatment system using the membrane unit according to the present invention.

As shown in the drawing, the separation membrane unit 55 includes a support frame 70, a separation membrane module 60, and a cleaning unit 80.

A plurality of separation membrane modules 60 are installed side by side at regular intervals inside the support frame 70 .

And the cleaning unit 80 is provided to remove foreign substances attached to the membrane module 60 by spraying air bubbles.

According to the separation membrane unit 55, only the liquid in the water to be treated can be passed through and transported, so that foreign substances are easily separated, and foreign substances filtered in the separation membrane by the bubbles of the washing unit 80 are easily desorbed.

To this end, the support frame 70 includes a pair of side walls 56 spaced apart from side to side, at least one upper support bar 57 provided on the upper side of the pair of side walls 56, and a lower portion of the pair of side walls 56. It includes at least one lower support bar 58 provided on the side.

In other words, the upper support bar 57 is spaced apart in front and back, and two are installed on the upper side of the side wall 56, the lower support bar 58 is located below the upper support bar 57, and the lower support bar 58 is Spaced apart in front and back, two are installed on the lower side of the side wall (56).

Also, the separation membrane modules 60 are installed between the pair of side walls 56 . Separation membrane modules 60 are supported by the upper support bar 57 and the lower support bar 58, and a plurality of them are installed side by side. In the illustrated example, a plurality of separation membrane modules 60 are spaced apart from side to side and installed side by side.

As shown in FIG. 2 , each separation membrane module 60 includes an upper header 61 and a lower header 63 , a support bar 64 , and a separation membrane 65 .

The upper header 61 and the lower header 63 are fixed in a state of being spaced apart in the vertical direction by the support bar 64 .

In addition, a separation membrane 65 having an empty inside is provided so that liquid can pass through. The upper portion of the separation membrane 65 is coupled to the upper header 61 and the lower portion of the separation membrane 65 is coupled to the lower header 63.

The upper header 61 has an empty inside, the top of the separation membrane 65 is inserted into the empty interior, and a connector 62 to which the collecting pipe 67 is connected is formed in the upper header 61, and the collecting pipe ( 67) is formed with an outlet 62 connected to the suction line.

Here, the separation membrane 65 may be formed of a hollow fiber, a flat membrane, or a membrane. In one embodiment, the separation membrane 65 is formed of hollow fibers 66, and the hollow fibers are synthetic hollow fibers. it is fiber

The washing unit 80 includes a first washing frame 81, a second washing frame 84, a bubble spraying unit 87, a washing movement unit 88, and a washing control unit 89.

The first washing frame 81 has a first washing lower frame 82 and a first washing upper frame 83 parallel to the direction in which the plurality of separation membrane modules 60 are arranged, and is located in front of the support frame 70. are provided

In addition, the second washing frame 84 has a second washing lower frame 85 and a second washing upper frame 86 parallel to the direction in which the plurality of separation membrane modules 60 are arranged, and the rear surface of the support frame 70 are provided in

The bubble spraying unit 87 is provided between the first washing frame 81 and the second washing frame 84 to move between the separation membrane modules 60 and to remove foreign substances by spraying bubbles.

Also, the cleaning moving unit 88 is provided to elevate the bubble spraying unit 87, and the washing control unit 89 is provided to control the bubble spraying unit 87 and the washing moving unit 88.

Here, the bubble injection unit 87 includes a spray frame 871, a first spray nozzle 872, a second spray nozzle 873, a third spray nozzle 874, a gas supply unit 875, and a spray valve 876 includes

The injection frame 871 is positioned between two adjacent membrane modules 60 .

Also, the first spray nozzles 872 are formed at regular intervals along the upper end of the spray frame 871 and spray air bubbles upward to suspend solid foreign substances in the water to be treated to be sucked into the membrane module 60. .

The second injection nozzles 873 are formed at both corners of the upper end of the injection frame 871 and are provided to eject foreign substances by injecting bubbles upward toward the separation membrane 65 .

In addition, the third spray nozzles 874 are formed at both corners of the lower end of the spray frame 871 and are provided to eject foreign substances by spraying air bubbles downward toward the separator 65 .

The gas supply unit 875 is provided to supply compressed gas to the injection frame 871 .

In addition, the injection valve 876 is a washing control unit to supply the compressed gas supplied to the gas supply unit 875 to one or more of the first injection nozzle 872, the second injection nozzle 873, and the third injection nozzle 874. (89).

In addition, as shown in FIG. 3, the washing moving unit 88 includes a washing rotating rod 881, a washing guide rod 882, a first moving block 883, a second moving block 884, and a washing moving motor 885. ).

The washing rotating rod 881 has a screw thread along the outer circumferential surface and is provided to be idling in the first lower washing frame 82 and the first upper washing frame 83 .

In addition, the washing guide rods 882 are provided on the second lower washing frame 85 and the second upper washing frame 86 .

The first movable block 883 has a screw thread corresponding to the screw thread of the washing rotating rod 881, and is provided at one end of the spray frame 871 to move up and down along the washing rotating rod 881.

And the second moving block 884 is provided at the other end of the spray frame 871 and is provided to move up and down along the washing guide rod 882 .

The washing movement motor 885 is provided to rotate the washing rotating rod 881, and thus, the spray frame 871 can be moved up and down.

The washing movement motor 885 may be provided in plural to simultaneously or individually rotate the plurality of washing rotating rods 881 .

The washing movement motor 885 is controlled by the washing control unit 89 and is controlled to interlock with the injection valve 876 to achieve the first washing mode S10, the second washing mode S20 and the third washing mode described later. A sequential washing process is performed in (S30).

As shown in FIG. 4, the washing controller 89 includes a first washing mode (S10), a second washing mode (S20), and a third washing mode (S30).

In the first cleaning mode (S10), when the spray frame 871 is located below the membrane module 60, the spray valve ( 876) to control.

Thus, foreign substances may be first separated from the water to be treated through the separation membrane module 60 and floated.

In the second washing mode (S20), when the spray frame 871 is moved upward by the cleaning moving unit 88, the gas supplied from the gas supply unit 875 is supplied to the first spray nozzle 872 and the second spray The injection valve 876 is controlled to supply any one or more of the nozzles 873.

Accordingly, while the spraying frame 871 is moved upward, bubbles are sprayed in an upward diagonal direction toward the separator 65 to effectively desorb and float the filtered foreign matter.

In addition, in the third washing mode (S30), when the spray frame 871 is moved downward by the washing moving unit 88, the gas supplied from the gas supply unit 875 is passed through the first spray nozzle 872 and the third spray The injection valve 876 is controlled to supply water to one or more of the nozzles 874 .

Accordingly, while the spraying frame 871 moves downward, air bubbles are sprayed in a downward diagonal direction toward the separator 65 to effectively remove and float the filtered foreign matter.

As the first washing mode (S10), the second washing mode (S20), and the third washing mode (S30) are sequentially performed by the washing controller 89, washing of the membrane module 60 is effectively performed.

Of course, it is natural that the washing control unit 89 is performed in a state in which the operation of the separation membrane module 60 is stopped.

As shown in FIG. 5, the advanced wastewater treatment system using the separation membrane unit 55 includes a flow control tank 10, an anoxic tank 20, an anaerobic tank 30, a contact aeration tank 40, and a membrane A separation tank 50 and phosphorus removal means are provided.

The water to be treated is introduced into the flow control tank 10 through a pretreatment device, that is, a screen, a grit tank, and the like. The treatment target water flowing into the flow control tank may be wastewater or heavy rainwater or contaminated seawater.

The flow rate control tank 10 serves to evenly adjust the inflow amount and contamination load of the water to be treated. A certain amount of water to be treated is introduced into the anoxic tank 20 by the pump 13 installed inside the flow control tank 10 .

The anoxic tank 20 is installed at the rear end of the flow control tank 10. The anoxic tank 20 is operated under anoxic conditions and converts nitrate nitrogen in the water to be treated flowing in from the flow control tank 10 into nitrogen gas and discharges it into the atmosphere to remove it. This denitrification reaction is performed by denitrifying microorganisms such as Pseudomonas, Micrococcus, and Bacillus.

A stirring device for equal distribution is installed in the anoxic tank 20. For example, the stirring device includes a rotating shaft 21 connected to a driving motor (not shown) installed on the top of the anoxic tank 20 and extending into the anoxic tank 20, and a screw 23 installed below the rotating shaft 21. made up of Supernatant water from the sludge storage tank 130 to be described later may flow into the non-acidic tank 20.

The anaerobic tank 30 is installed at the rear end of the anoxic tank 20. An outlet hole 27 is formed at the upper part of the partition wall formed between the anoxic tank 20 and the anaerobic tank 30 . Therefore, the treatment target water denitrified in the anoxic tank 20 flows into the anaerobic tank 30 through the outflow hole 27 . The anaerobic tank 30 is operated under anaerobic conditions, and releases phosphorus up to 3 to 4 times the inflow concentration using microorganisms. In the anaerobic tank 30, a driving motor (not shown), a rotating shaft 31, and a screw 33 are installed as a stirring device for equal distribution like the anoxic tank 20.

The contact aeration tank 40 is installed at the rear end of the anaerobic tank 30. Water to be treated flows from the anaerobic tank 30 to the contact aeration tank 40 through the outflow hole 37 formed on the upper part of the partition wall formed between the anaerobic tank 30 and the contact aeration tank 40 .

The contact aeration tank 40 contacts the water to be treated flowing from the anaerobic tank 30 under the aeration condition with the carrier 45 immobilized with microorganisms to nitrify ammonia nitrogen. At the same time, excessive intake of phosphorus by microorganisms and oxidation of organic matter occur.

Inside the contact aeration tank 40, an upper perforated panel 43 and a lower perforated panel 41 spaced apart vertically are respectively installed. Each of the perforated panels 41 and 43 is installed to cross the inner space of the contact aeration tank 41 horizontally. A carrier 45 is filled in the reaction space formed between the upper perforated panel 43 and the lower perforated panel 41 . Preferably, the total volume occupied by the carrier 45 is 55% or more of the volume of the reaction space. The upper and lower perforated panels 43 and 41 are formed with a plurality of through-holes having a size sufficient to allow the water to be treated to pass through but to block the passage of the carrier 45 . Therefore, the carrier 45 comes into contact with the water to be treated while flowing in the reaction space by the water flow formed by the aeration unit. In this way, contact efficiency can be improved by configuring the carrier 45 as a fluidized bed.

The carrier 45 applicable to the present invention can immobilize microorganisms, and known carriers having a specific gravity of about 0.6 to 0.9 can be used. As an example of the carrier, the carrier 45 is made of a polyethylene material and may have a cylindrical shape with an empty interior. In addition, as another example of the carrier, a porous ceramic filter medium containing oyster shells may be used.

Aeration means for aeration is provided inside the contact aeration tank 40. A blower 47 and a diffuser 49 connected to the blower 47 and installed below the contact aeration tank 40 are provided as aeration means for creating aeration conditions. By filling the contact aeration tank 40 with the carrier 45 by the aeration means and aerating it, nitrification by aerobic microorganisms, random microorganisms, anaerobic microorganisms, etc. and oxidation of organic substances proceed.

Water to be treated is introduced into the membrane separation tank 50 installed at the rear end of the contact aeration tank 40 through the outflow hole 46 .

A membrane separation unit 55 is installed inside the membrane separation tank 50 to separate sludge and effluent into solid and liquid. A detailed configuration of the membrane separation unit 55 made of a separation membrane will be described later. Of course, an aeration means for operating the membrane separation tank 50 under aerobic conditions may be installed in the membrane separation tank 50 .

When the suction pump 113 installed in the suction line 111 connected to the membrane separation unit 55 operates, water flows into the hollow fiber by the suction force, and the water introduced into the hollow fiber separates the membrane through the suction line 111. It is discharged to the outside of the tank 50. At this time, the water discharged through the suction line 111 is the discharged water.

The phosphorus removal means for removing phosphorus in the effluent discharged from the membrane separation tank 50 includes a stirring unit 110 connected to the membrane separation unit 55 by a suction line 111 and into which the effluent flows, and a stirring unit ( 110) connected to the aggregator 110 to supply the coagulant to the coagulant supply unit 100, and an inclined plate 121 installed therein to precipitate the aggregates in the effluent flowing out of the agitator 110 and discharge the supernatant to the outside A precipitation tank 120 is provided.

As the stirring unit 110, any structure capable of mixing the coagulant and the effluent may be applied. For example, the stirring unit 110 includes a stirring tank through which the effluent and the coagulant are introduced, a rotating shaft installed inside the stirring tank, and a stirring wing formed on the outer circumference of the rotating shaft to stir the effluent and the coagulant.

The coagulant supply unit 100 for supplying the coagulant to the agitator 110 includes a coagulant storage tank 101, a coagulant supply pipe 105 connecting the coagulant storage tank 101 and the agitator 110, and a coagulant supply pipe ( 105) and a metering pump 107 for quantitatively pumping the coagulant to the stirring unit 110. As the coagulant, a conventional inorganic polymer coagulant may be used.

The sedimentation tank 120 has a plurality of inclined plates 121 installed at the top. When the water level of the sedimentation tank 120 rises due to the inflow of the water from the agitator 110, the sludge or floc aggregated on the inclined plate 121 collides with the inclined plate 121 and is precipitated to the bottom of the sedimentation tank 120 by gravity along the inclined plate 121, sludge The final discharged water from which is removed is discharged to the outside through the discharge line 123 after rising to the upper side of the inclined plate 121. The settled sludge or floc is pumped into the sludge storage tank 130 and stored. The supernatant in the sludge storage tank 130 is returned to the flow control tank 10 in a certain amount as described above. The configuration of the settling tank 120 may be omitted if necessary.

The above-described advanced wastewater treatment system of the present invention is not only excellent in the decomposition ability of various organic substances, but also additionally performs a process of reducing phosphorus through physical and chemical reactions, so that the concentration of phosphorus in effluent is adjusted to the water quality standard without being affected by external factors. can be kept constant.

A water collection pipe 67 is installed on the upper part of the support frame so that treated water separated from the sludge by the separation membrane 65 can be discharged to the outside, and the water collection pipe is connected to the suction line 111 .

Both sides of the water collecting pipe 67 are coupled to a pair of brackets 59 installed on the side wall 56, respectively. A plurality of connection sockets 69 coupled to the connection port 62 of the separation membrane module 60 are formed at the lower part of the collecting pipe 67, and an outlet port 68 connected to the suction line is formed at the upper part of the collecting pipe 67. ) is formed.

In the separation membrane 65 of the separation membrane module 60, as time passes, sludge or suspended matter adheres to the surface of the hollow fiber 66, so the filtration efficiency of the separation membrane 65 gradually decreases, but air bubbles sprayed from the washing unit 80 It serves to desorb foreign substances attached to the separation membrane 65 by the.

10: flow control tank 20: anoxic tank
30: anaerobic tank 40: contact aeration tank
50: membrane separation tank 55: separation membrane unit
60: separation membrane module 65: separation membrane
70: support frame 80: cleaning unit
81: first washing frame 84: second washing frame
87: bubble spraying unit 88: washing moving unit
89: washing control unit

Claims (1)

An anoxic tank for removing nitrate nitrogen from the water to be treated flowing in from the flow control tank;
an anaerobic tank for releasing phosphorus using microorganisms in the water to be treated flowing in from the anoxic tank;
a contact aeration tank for nitrifying nitrogen by contacting the water to be treated flowing from the anaerobic tank under aeration conditions with a carrier immobilized with microorganisms;
a membrane separation tank in which a separation membrane unit for solid-liquid separation of the water to be treated flowing from the contact aeration tank is installed; and
A phosphorus removal means for removing phosphorus in effluent separated from the sludge by the separation membrane unit and discharged,
The separation membrane unit,
support frame;
a plurality of membrane modules installed side by side at regular intervals inside the support frame; and
A washing unit for dissolving foreign substances attached to the separation membrane module by spraying air bubbles;
The washing unit,
a first washing frame having a first washing lower frame and a first washing upper frame parallel to the direction in which the plurality of separation membrane modules are arranged, and provided on a front surface of the support frame;
a second washing frame having a second washing lower frame and a second washing upper frame parallel to the direction in which the plurality of separation membrane modules are arranged, and provided on a rear surface of the support frame;
an air bubble spraying unit provided between the first washing frame and the second washing frame to move between the respective membrane modules and to spray air bubbles to remove foreign substances;
a cleaning moving unit for moving the bubble spraying unit up and down; and
It includes; a washing control unit for controlling the bubble injection unit and the washing movement unit,
The bubble injection unit,
a spraying frame positioned between two adjacent membrane modules;
first injection nozzles formed at regular intervals along the upper end of the injection frame to eject air bubbles upward to suspend solid foreign substances in the water to be treated to be sucked into the membrane module;
second injection nozzles formed at both corners of the upper end of the injection frame to eject foreign substances by injecting air bubbles inclined upward toward the injection film;
third injection nozzles formed at both corners of the lower end of the injection frame to eject foreign substances by injecting air bubbles at a downward slope toward the injection film;
a gas supply unit for supplying compressed gas to the injection frame; and
An injection valve controlled by the washing control unit to supply compressed gas supplied to the gas supply unit to at least one of the first injection nozzle, the second injection nozzle, and the third injection nozzle;
The washing control unit,
a first washing mode for controlling an injection valve to supply gas supplied from the gas supply unit to a first injection nozzle when the injection frame is located below the membrane module;
a second washing mode for controlling a spray valve to supply gas supplied from the gas supply unit to at least one of a first spray nozzle and a second spray nozzle when the spray frame is moved upward by the washing moving unit; and
a third washing mode for controlling a spray valve to supply gas supplied from the gas supply unit to at least one of a first spray nozzle and a third spray nozzle when the spray frame is moved downward by the washing moving unit; Including,
The support frame,
A pair of side walls spaced apart from side to side;
At least one upper support bar provided on the upper side of the pair of side walls; and
Including; at least one lower support bar provided on the lower side of the pair of side walls,
The cleaning moving part,
a washing rotation rod having a screw thread along an outer circumferential surface and idlingly provided to the first lower washing frame and the first upper washing frame;
washing guide rods provided on the second lower washing frame and the second upper washing frame;
a first moving block having a screw thread corresponding to the screw thread of the washing rotating rod, provided at one end of the spray frame, and moved up and down along the washing rotating rod;
a second movable block provided at the other end of the spray frame and moved up and down along the washing guide rod; and
High-efficiency wastewater advanced treatment system comprising a; washing movement motor for rotating the washing rotating rod.

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