KR101891542B1 - Sewage Treatment Apparatus with Granular Activated Sludge and Bio Membrane-reactor and a Method for Treating Sewage Threrewith - Google Patents

Abstract

The present invention relates to a granular activated sludge granulating method for granular activated sludge, which effectively removes contaminants contained in raw water through a granular sludge containing granular activated sludge and filtration through a movable membrane provided on the granular sludge tank, The present invention relates to a combined water treatment system using sludge and membrane bioreactor and a water treatment method using the sludge and membrane bioreactor. The problem of conventional biological water treatment apparatus not only minimizes membrane contamination, but also prolong membrane washing cycle, can do. In addition, the installation cost is reduced because additional equipment such as an aeration device, pump, piping, and the like is not required to increase the period of use of the membrane cleaning and membrane, and since the membrane is provided inside the granulation tank, Not only can the equipment CAPEX be reduced, but OPEX can also be reduced by reducing energy consumption during system operation.

Description

TECHNICAL FIELD The present invention relates to a water treatment apparatus including a granular activated sludge and a membrane bioreactor, and a water treatment method using the granular activated sludge and the membrane bioreactor.

The present invention relates to a granular activated sludge granulating method for granular activated sludge, which effectively removes contaminants contained in raw water through a granular sludge containing granular activated sludge and filtration through a movable membrane provided on the granular sludge tank, Sludge and membrane bioreactor, and a water treatment method using the same.

The activated sludge process, which is generally used as a biological treatment facility for wastewater, requires an aeration tank that oxidizes organic matter using suspended microorganisms, and a secondary settler that separates suspended microorganisms and treated water.

However, since the secondary settling basin facility is complicated in mechanical system, sensitive to hydraulic loads, and has various problems such as sludge rising, recently, a method of using a membrane by immersing it in an aeration tank of an activated sludge process (Membrane Bio Reactor, and MBR) have been developed.

In order to increase the removal of pollutants contained in the wastewater, the MBR system can treat the various modified activated sludge processes either singly or in succession, and as a physical barrier for complete solid-liquid separation, MF: microfiltration) or ultrafiltration (UF) membranes. UF and MF membranes may be used interspersed either inside the bioreactor or outside the bioreactor.

However, when the membrane is immersed in the activated sludge process, the activated sludge is crushed by the stickiness and aeration of the activated sludge, and the membrane surface is frequently washed by the clogging due to the particles. The problem is highlighted as the greatest disadvantage of the membrane process, and it is the biggest obstacle in practical use.

In order to prevent clogging due to crushed activated sludge, there is a granulation method of sludge using the property of self-immobilization of microorganisms. Typically, UASB (Upflow Anaerobic Sludge Blanket) method and anaerobic aerobic And a granulation method carried out under the conditions. The aerobic granulation method will be described in detail as follows.

When the microorganisms in the activated sludge aeration tank are brought into contact with the stirrer at a slow speed, contact between the sludges is caused by the cross-linking action of the activated sludge slurry. As a result, the sludge is aggregated and self- And the granulated activated sludge is excellent in sedimentation property and becomes compact so that the volume occupied in the reaction tank is reduced, and a sedimentation tank is not required.

The activated sludge granular makeup consists largely of an indirect aeration tank and granular tanks. In the indirect aeration tank, the effluent from the upper part of the granulation tank is pumped into the pump and excessively aerated, and then the effluent rich in dissolved oxygen is flowed upward from the granulation tank The sludge of the granular algae is maintained in the aerobic condition and contact between the sludge in the granular algae can be induced through the vortex or the agitator due to the hydraulic force flowing into the granular algae from the indirect aeration tank.

[0002] Japanese Patent Application No. 1336988 (Registration Announcement dated May 31, 2013) relates to an apparatus and method for treating wastewater using granular sludge, comprising an anaerobic granular sludge in an anaerobic tank, an anoxic tank, a first aeration tank and a second aeration tank, We present an apparatus and method for treating sewage and wastewater using granular sludge that significantly improves the efficiency of treatment of contaminants such as organic matter, nitrogen and phosphorus in the wastewater and wastewater by injecting aerobic granular sludge, second aerobic granular sludge and nitrate particulate sludge respectively. .

Such prior art techniques have been proposed in order to separate and discharge the suspended microorganisms contained in the treated water that has passed through the aeration tank and to discharge the treated water through a settling tank further containing a membrane, There is a disadvantage that additional devices such as an air release device, a pump, and a piping are required.

Registration No. 1336988 (Registered on December 5, 2013)

The present invention minimizes the installation area of the complex water treatment system by effectively removing the contaminants contained in the raw water through the granular sludge containing the granular activated sludge and providing the movable membrane provided on the granular sludge tank And a membrane bioreactor capable of improving the efficiency of treatment of contaminants such as water, organic matter, nitrogen, phosphorus, and the like, and to provide a combined water treatment apparatus and method capable of performing highly water treatment through a combined process.

Also, in order to prevent the sludge blanket from sticking in the granular sludge tank, a complex water treatment apparatus and method are provided in which agitation means is provided so as to give a predetermined stirring effect, thereby minimizing installation cost and operation cost.

According to an aspect of the present invention, there is provided an indirect aeration tank for supplying air to saturate dissolved oxygen concentration of raw water. And a granulation tank 200 in which suspended microorganisms contained in the treated water passed through the indirect aeration tank are granulated and a sludge blanket is formed on the bottom surface of the granulation tank 200. The granular sludge tank 200 is a sludge blanket, (Not shown) to the sludge blanket 200 so as to prevent the sludge blanket from sticking to the inner surface of the bottom surface of the granulation tank 200, (Membrane) 500 according to an embodiment of the present invention.

The granulation inside the granulating tank 200 is granulated by gelatin which is a byproduct produced by the contact of the floating microorganisms and the hydrodynamic force of the treated water conveyed in the indirect aeration tank 100, Is accelerated by a second hydraulic force due to the stirring means included in the granulating tank 200, and the stirring means is preferably the stirrer 210 existing in the granulating tank 200 .

The membrane 500 used in the present invention is preferably a micro filtration (MF) membrane or an ultra-filtration (UF) membrane. When the membrane 500 is placed in the granulation tank 200 The sludge blanket may further include a partition 230 partitioning the inside of the granulation tank into an upper part and a lower part to block propagation of turbulence generated by the movement of the granulation sludge in the sludge blanket and maintain a stable shape of the sludge blanket.

The partition 230 is preferably a porous member or an inclined plate which is inclined at a predetermined interval and further includes a reciprocating device for reciprocating the membrane in the front and rear or left and right in the granular tank to reduce contamination of the membrane 500 .

Here, the reciprocating device may include a slide frame connected to and reciprocating with the membrane; A rotor connected to the slide frame by an axis and rotating; And a motor that rotates the rotor and converts the rotary motion to a reciprocating motion of the slide frame through a connected shaft, wherein the shock load generated by the reciprocating device is such that a shock absorber And the slide frame is characterized in that it is varied along a slide rail which carries a linear bearing and a slide bearing support.

It is preferable that the movable membrane (Membrane) 500 used in the present invention moves continuously while the supernatant in the granulation tank 200 is being filtered or selectively moved as needed in order to prevent contamination of the membrane , The motor preferably drives the stirring means in the granulating tank 200 while driving the reciprocating device.

In addition, the stirring means may include an auxiliary circulation channel 437 for circulating the treated water through the sludge blanket from the upper part of the granulating tank to the lower part, It can be circulated through the auxiliary circulation channel 437 by the generated force.

According to another embodiment of the present invention, there is provided an air purifying method comprising: aeration step of injecting air into raw water containing contaminants; A granulating step of passing the floating microorganisms contained in the treated water passing through the aeration step and having a saturated dissolved oxygen amount; And a filtration step of passing the supernatant liquid through a movable membrane except for the slurry granulated in the granulation step, and in the granulating step, the sludge formed by the granulated suspended microorganisms, And stirring the blanket by stirring means.

The granulating step is performed by gelatin, which is a by-product generated by the contact of the floating microorganisms. The granulating step is performed by the hydrodynamic force of the process water conveyed through the aeration step and the second hydrodynamic force, The granular material is accelerated by a hydraulic force and the propagation of the turbulence generated by the movement of the membrane 500 in the granular material 200 is blocked in the granular material tank 200 in which the granulating step and the filtering step are performed And a partition 230 partitioning the inside of the granulating tank 200 into an upper part and a lower part to maintain a stable shape of the sludge blanket.

The second hydraulic force may be formed by an agitator 210 existing in the granulating tank 200 or an auxiliary circulating water channel 437 circulating the treated water through the sludge blanket to the lower part from the upper part of the granulating tank And the partition 230 may be a porous member or an inclined plate which is inclined at a predetermined interval.

In the filtration step, the movable membrane may reciprocate back and forth or side to side, and the movable membrane may be moved continuously during filtration of the supernatant in the granulating step, or selectively moved as needed to prevent contamination of the membrane .

The present invention effectively removes contaminants contained in the raw water through the granular activated sludge containing granular activated sludge and filtrates it with a movable membrane provided on the granular sludge tank to perform advanced water treatment to solve the problem of the conventional biological water treatment apparatus Not only can this film contamination be minimized, but also it is possible to prolong the membrane washing period and prolong the operation period.

In addition, the installation cost is reduced because additional equipment such as an aeration device, pump, piping, and the like is not required to increase the period of use of the membrane cleaning and membrane, and since the membrane is provided inside the granulation tank, Not only can the facility CAPEX be reduced, but OPEX can also be saved due to the reduction of energy consumption during system operation.

The water treatment apparatus and the water treatment method of the present invention provide a complex water treatment apparatus and method in which various agitation means are provided so as to give a stirring effect for preventing the sludge blanket from sticking in the granular sludge tank, The operation cost can be minimized.

1 is a schematic view schematically showing a conventional combined process system of granular sludge and membrane bioreactor.
2 is a schematic view schematically showing a composite water treatment system using a granular activated sludge and a membrane bioreactor according to an embodiment of the present invention.
3 is a schematic view schematically showing a composite water treatment system using a granular activated sludge and a membrane bioreactor according to another embodiment of the present invention.
4 is a schematic view schematically showing a composite water treatment system using a granular activated sludge and a membrane bioreactor according to another embodiment of the present invention.
5 is a schematic view schematically showing the principle of prevention of contamination of a movable membrane provided in the granular vase of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Unless otherwise specified in the present specification, 'raw water' means sewage or wastewater, which is a target for which various pollutants are contained and water treatment is required. The term "treated water" refers to the raw water that has passed through each stage, stage, or apparatus, "return water" refers to the enemy that returns to the stage, stage, or apparatus through which part of the treated water has been passed, Granulation "refers to a phenomenon in which microorganisms contained in raw water are combined with each other to form a particle form. Hereinafter, the terms" coagulation "and" flocculation ", which are entangled by mutual contact, ) ', But should be understood in a broad sense including this.

Hereinafter, a composite water treatment apparatus using granular activated sludge and membrane bioreactor of the present invention will be described in detail with reference to the drawings.

1, which is a Membrane Bio Reactor (MBR) used by immersing a membrane in an aeration tank of the existing activated sludge process, in order to remove pollutants contained in raw water, raw water or a granulated water 200 An indirect aeration tank 100 that not only allows the dissolved oxygen contained in the raw water to reach the saturation concentration due to the hydraulic force by the return water conveyed in the raw water and the air to be injected but also prepares for granulating the contaminants, A granulating tank 200 for granulating and sludging the raw water having passed through the indirect aeration tank 100 and having a saturated dissolved oxygen amount, a sludge granulating tank 200 for granulating sludge, And a filtration tank 300 for discharging water.

In the filtration tank 300 including the membrane, fine granular contaminants may contaminate the membrane and periodically wash the membrane during long-term use. In order to prevent the contamination of the membrane, it is necessary to install an aeration device, a pump, a pipe, and the like in the filtration tank 300 in addition to the increase in energy consumption. exist.

Accordingly, a composite water treatment apparatus using the granular activated sludge and the membrane bioreactor of the present invention for solving the problem of a membrane reactor (MBR) used by immersing a membrane in an aeration tank of the conventional activated sludge process, The pollutants contained in the granular sludge can be effectively granularized and removed. In addition, by using the movable membrane to discharge the treated water to the outside, the clogging phenomenon occurring when the membrane is immersed is minimized, thereby increasing the membrane washing period and the operation period, and forming a highly treated water.

The composite water treatment system using the granular activated sludge and the membrane bioreactor according to the present invention is a continuous flow high-temperature water treatment apparatus in which an indirect aeration tank and a granular tank are sequentially arranged. It is a device for treating a pollutant such as organic matter, nitrogen, In order to maximize the efficiency, to minimize the volume of the apparatus according to a short hydraulic retention time, and to facilitate smooth solid-liquid separation in the post-treatment process, the indirect aeration tank and the granular tank are sequentially arranged, That is, the present invention relates to an apparatus for injecting high-quality granular activated sludge produced in an indirect aeration tank and a granulation tank to perform water treatment.

The term 'granular activated sludge' refers to the fact that the microorganisms contained in the activated sludge are self-immobilized by biological, physical, chemical factors, etc. without biofilms such as expensive supports and rotors, .

The granular activated sludge can be selectively used according to the state of the raw water and the operation method of the anaerobic granular sludge or the aerated granular sludge, preferably aerobic granular sludge. In addition, the preferable amount of the granular activated sludge can be used by suitably adjusting the mixed suspended solids (MLSS) of the granulation tank according to the organic matter and nitrogen concentration contained in the raw water.

FIG. 2 is a schematic view illustrating a combined water treatment apparatus using a granular activated sludge and a membrane bioreactor according to an embodiment of the present invention. More specifically, FIG. And a granulating tank (200) having a sludge blanket (250) formed therein for granulating contaminants contained in the treated water passing through the indirect aeration tank (100), wherein the granulating tank (200) And a membrane (500) provided on the upper part of the wastepaper and movable in the granular vat.

The granulating tank 200 further includes agitation means capable of imparting a predetermined stirring effect to the sludge blanket so that the sludge blanket 250 is not fixed to the bottom wall of the granulating tank 200.

The indirect aeration tank 100 supplies air through the nozzles provided in the lower portion of the indirect aeration tank by supplying air through an air injecting device to generate upward flow so as to supply the raw water flowing through the inflow channel 410 So that the concentration of dissolved oxygen in the exhaust gas can reach a saturation state.

The air injecting apparatus 110 is not limited to the member surface that is typically used for injecting air used for water treatment. The air injecting apparatus 110 can inject air through the nozzle 111 from the lower part to the upper part, do.

The raw water having passed through the indirect aeration tank and having a saturated dissolved oxygen amount is introduced into the lower part of the granulation tank 200 through the transfer water channel 430 so that the water is supplied to the agitator 210 are applied to the granular activated sludge, whereby the granular activated sludges collide with each other and are granulated by the gelatin material which is a byproduct of the microbial reaction. At this time. The granular organism is formed into an aerobic environment due to raw water rich in dissolved oxygen, and organic matter-removing microorganisms and nitrogen component-oxidizing microorganisms using dissolved oxygen as an electron acceptor are granulated by the hydraulic force and agitating force .

Particularly, the granulation inside the granulation tank 200 is granulated by gelatin, which is a byproduct produced by the contact of the floating microorganisms. The hydrodynamic force of the treated water conveyed in the indirect aeration tank 100, And the second hydraulic force resulting from the stirring means included in the granular tank 200. [

The stirring means may include an agitator 210 existing in the granulating tank 200 or an auxiliary circulating water channel 437 circulating the treated water through the sludge blanket 250 downward from the upper part of the granulating tank, The treated water circulates through the auxiliary circulation channel 437 by a force generated by the movement of the membrane 500 or accelerates the granular phenomenon in the granulation tank 200 by the rotation of the stirrer 210 It is possible to effectively prevent the sludge blanket 250 from being settled on the bottom surface of the granulating tank 200 to be fixed.

Accordingly, the second hydraulic force is formed by the agitator 210 existing in the granulating tank 200 or the auxiliary circulating water channel 437 for circulating the treated water through the sludge blanket to the lower part from the upper part of the granulating tank .

When the agitator 210 is used as the agitating means, the agitator 210 may be moved by a separate motor or a power source. Preferably, the agitator 210 is movable A motor serving as a moving means for moving the membrane 500 can be shared and used.

In this case, when the rotation speed of the agitator 210 is not equal to the movement speed of the movable film 500, it is preferable to control the optimal stirring speed and the moving speed of the film by adding gears having appropriate rotation ratios. A suitable number of revolutions of the final stirrer is more preferably in the range of 25 to 40 rpm, and the moving speed of the movable film is more preferably in the range of about 7 to 13 cm / sec.

The amount of granular activated sludge can be reduced through the sludge discharge pipe 435 provided in the lower part of the granulating tank or the granular activated sludge can be discharged and processed.

As described above, the organic matter-removing microorganisms granulated under the aerobic condition of the granulation tank oxidizes and removes the organic substances, but the nitrogen component-oxidizing microorganisms can remove the ammonia nitrogen (NH ₄ ⁺ ) contained in the raw water from the nitrate nitrogen ₃ ^- ) or nitrite nitrogen (NO ₂ ^- ), these nitrogen oxides remain in the dissolved state in the raw water. Therefore, in order not only to remove the nitrate nitrogen or nitrite nitrogen, but also to maintain the concentration of the granular activated sludge in the granulation tank, a sludge blanket 250 (sludge blanket) A part of raw water in which the sludge and the raw water are mixed through the return water channel 433 can be returned to the indirect aeration tank.

The composite water treatment apparatus using the granular activated sludge and the membrane bioreactor of the present invention may include a membrane 500 provided on the granular tank 200 and movable in the granular tank.

The turbulent flow in the granulation tank 200 caused by the movement of the membrane 500 interrupts the propagation of the sludge to the sludge blanket 250 so that the granular activated sludge in the granulation tank and the sludge blanket 250) and a supernatant, and a partition 230 partitioning the inside of the granulation tank.

The partition 230 is not particularly limited as long as it divides the space of the granulating tank 200 into an upper portion and a lower portion and does not block the flow of raw water. Preferably, porous members having pores or inclined plates inclined at regular intervals may be used. More preferably, a Lamella swash plate may be used.

The movable membrane 500 formed on the upper part of the granulating tank 200 can move inside the upper part of the granulating tank 200 to reduce the contamination of the membrane. And a reciprocating device for reciprocating the membrane can be further included.

The reciprocating device includes a slide frame reciprocally connected to the membrane, a shaft connected to the slide frame for rotating, a rotor rotatably coupled to the slide, To a low-speed motor.

More particularly, the membranes may use low pressure microfiltration (MF) or ultrafiltration (UF) membranes, which are used as physical barriers for complete solid-liquid separation, and the membranes may be mechanically interconnected to the reciprocating device. The reciprocating device is used to reciprocate the membrane, for example, the reciprocating device may use a mechanical device for converting the rotational motion into a reciprocating motion.

The membrane 500 may continuously reciprocate while filtering the supernatant liquid in the granulation tank, and may be selectively reciprocated in order to prevent contamination of the membrane.

The membrane is connected to a slide frame and the motor-driven rotor can be connected to the slide frame via an axis. Accordingly, the rotational motion of the rotor can be converted into the reciprocating motion of the slide frame, and the frequency and speed of the reciprocation can be controlled by the rotational speed of the rotor. More specifically, the rotary motion of the rotor can be converted into the reciprocating motion of the slide frame by moving the shaft through the motor. The impact load due to the reciprocating motion can further reduce and reduce the shock absorber between the slide frame and the shaft, and the slide frame can be changed along the slide rail carrying the linear bearing and the slide bearing support. The reciprocating device for reciprocating the membrane in the present invention can use many other types of devices capable of providing a predetermined reciprocating motion.

At this time, the motor can move the film 500, and at the same time, the stirrer 210 installed in the granulating tank 200 can be moved. By simultaneously operating the membrane 500 and the stirrer 210 using the single motor, the facility cost and operation cost of the entire water treatment apparatus can be reduced. In order to appropriately adjust the movement speed or the rotation speed of each of the motors 500 and 500 while simultaneously operating the movement of the membrane 500 and the rotation of the agitator 21, a connection means having an appropriate gear ratio is selected It is also possible to do. It will be appreciated that control means for monitoring the operation speed of each unit in the water treatment apparatus and appropriately controlling the operation speed may be added at this time.

Unlike the membrane separating the contaminants from the membrane using the air bubbles injected through the air injection device used in the general MBR shown in FIG. 1, the movable membrane of the present invention, as shown in FIGS. 2 to 4, An excellent cleaning effect can be obtained by using an inertial force formed in a direction opposite to the moving direction of the separation membrane. Accordingly, the air pollution is continuously reduced, so that an air injecting device is not necessary, and there is an advantage that it can be applied and installed in an existing system without adding an installation space for filtration through an external membrane.

FIG. 2 illustrates a water treatment apparatus including a granular activated sludge and a membrane bioreactor according to an embodiment of the present invention. The indirect aeration tank 100 supplies air to saturate dissolved oxygen concentration of raw water. And a granulating tank (200) in which suspended microorganisms contained in the treated water passed through the indirect aeration tank are granulated and a sludge blanket is formed on the bottom surface of the granulated water.

At this time, the granulating tank 200 internally includes agitating means capable of imparting a predetermined stirring effect to the sludge blanket so that the sludge blanket is not fixed to the inner wall of the bottom surface of the granulating tank 200, And a membrane (500) which is movable in the granulating tank (200).

A sludge blanket 250 is formed at the lower part of the partition wall 230 and a sludge blanket 250 for stirring the sludge blanket 250 is formed in the granulation tank 200 The movable film 500 is connected to a motor serving as a driving means for moving the upper portion of the partition wall 230. The driving motor of the stirrer 210 moves the film 500, Respectively.

FIG. 3 shows a water treatment apparatus including a granular activated sludge and a membrane bioreactor in which a single motor is used to simultaneously move the stirrer 210 and the membrane.

4 is a schematic diagram illustrating another embodiment of the present invention in which a separate stirrer 210 is not formed in the lower part of the granular alumina tank 200 and the agitating means of the sludge blanket 250 And an auxiliary circulation channel 437 for circulating the treated water through the sludge blanket 250 to the lower part.

This structure is formed on the outside of the granular material tank 200 by using the inertial force generated by the movement of the film 500 moving above the granular material tank 200 instead of the stirrer in the lower part of the granular material tank 200 By inducing the flow of the treated water through the auxiliary circulation channel 437, the sludge blanket 250 can be given a stirring effect and the granulation can be accelerated. When the auxiliary circulation water channel 437 is used, there is an effect that the operation cost can be reduced because no separate power for the flow of the treated water is required.

Alternatively, when it is necessary to control the flow rate of the treated water through the auxiliary circulation channel 437, a separate low-speed motor or a deceleration member or the like may be added to the auxiliary circulation channel 437.

Another embodiment of the present invention is directed to a method of treating a suspended microorganism, comprising: aeration step of injecting air into raw water containing contaminants; a granulation step of granulating suspended microorganisms contained in the treated water passing through the aeration step, And a composite water treatment method using a granular activated sludge and a membrane bioreactor, wherein the granular activated sludge includes a filtration step of passing the supernatant through a movable membrane (Membrane), except for the slurry granulated in the step Water treatment can be performed using the water treatment apparatus of the present invention shown in FIG.

According to the composite water treatment method using the granular activated sludge and the membrane bioreactor of the present invention, the aeration step of injecting air into raw water containing contaminants and injecting air so that the amount of dissolved oxygen in the raw water reaches a saturated state desirable.

The granular activated sludge can be produced through the granulation step of granulating the suspended microorganisms contained in the treated water that has passed through the aeration step and the organic matter is actively decomposed by the granular activated sludge to obtain energy, The organic matter in the raw water is converted to the new (C ₅ H ₇ O ₂ N), CO _2, etc. of the microorganism and is removed.

Phosphorus accumulating organisms (PAOs) contained in the granular activated sludge are stored in cells in the form of poly-phosphate by ingesting phosphate ions (orthophosphate) from the outside while decomposing PHB stored in the cells in the aerobic state into oxygen . In order to continuously supply the energy source (ATP) required for the synthesis process, the phosphorus intake by PAOs (Acinetobacter), which is the main dominant species of PAOs, is increased from the outside. Such microorganisms having high phosphorus intake are classified into suspended microorganisms And discharged together with the aerobic floating microorganisms contained in the raw water. The discharged suspended microorganisms are discharged together with the precipitated slurry provided in the lower part of the granulation tank, so that phosphorus contained in the raw water is finally removed.

The supernatant liquid may be discharged through the filtration step of passing through the movable membrane, except for the granulated slurry while passing through the granulating step.

The detailed description of the internal structure of the movable membrane and the granulating tank has been already described in detail above, and therefore will not be described.

Therefore, the composite water treatment system using the granular activated sludge and the membrane bioreactor of the present invention and the water treatment method using the granular activated sludge and the membrane bioreactor of the present invention are capable of simultaneous exhalation and anaerobic digestion of the granular activated sludge and excellent sedimentation through granulation, The time of the treatment process can be shortened and the installation area of the settling basin can be reduced. In addition, since a film which can be moved is provided on the granular tanks and the granules are filtered and discharged, it is unnecessary to additionally provide a device such as aeration device, pump, piping or the like in order to increase membrane filtration and film use period, The cleaning cycle of the membrane is extended, and the operation period is prolonged, thereby providing an energy saving effect.

The present invention is not limited to the above-described specific embodiments and descriptions, and various modifications can be made to those skilled in the art without departing from the gist of the present invention claimed in the claims. And such modifications are within the scope of protection of the present invention.

100: indirect aeration tank 110: air injection device
111: nozzle 200:
210: stirrer 230: partition wall
250: sludge blanket 300: filtration tank
410: Inflow channel 430: Feeding channel
433: return water line 435: sludge discharge pipe
437: auxiliary circulation channel 450: drainage water
500: Membrane

Claims (21)

An indirect aeration tank 100 for supplying air to saturate the dissolved oxygen concentration of the raw water; And
And a granulating tank (200) in which suspended microorganisms contained in the treated water passed through the indirect aeration tank are granulated and a sludge blanket is formed on the bottom surface of the granulated water,
The granulating tank 200 includes partition walls 230 that are granulated by gelatin, which is a by-product generated by the contact of floating microorganisms, and partition the inside of the granulating tank into an upper portion and a lower portion,
A membrane (500) movable in the granulating tank (200) is disposed on the upper part of the granulating tank (200)
In the lower part of the granulating tank 200, agitation means capable of imparting a predetermined stirring effect to the sludge blanket is provided so as not to be fixed to the inner wall of the bottom surface,
The partition wall 230 is a Lamella swash plate disposed at an interval with a predetermined interval and blocks the propagation of the turbulence generated by the movement of the membrane 500 in the granulation tank 200 to the lower part of the granulation tank, It is possible to maintain a stable shape of the sludge blanket formed in the lower part of the vase,
The reciprocating device which is an agitator 210 existing inside the granular vat 200 and the reciprocating device which reduces the contamination of the film 500 by reciprocating the membrane in the front, Wherein the granular activated sludge and the membrane bioreactor are driven by at least one of the granular activated sludge and the membrane bioreactor. The method according to claim 1,
The granulation inside the granulating tank 200 is granulated by gelatin which is a byproduct produced by the contact of the floating microorganisms and the hydrodynamic force of the treated water conveyed in the indirect aeration tank 100, Is accelerated by a second hydraulic force resulting from agitation means contained in the granular activated sludge (200). delete The method according to claim 1,
Characterized in that the membrane (500) is a micro filtration (MF) membrane or an ultra-filtration (UF) membrane. delete delete delete The method according to claim 1,
In the reciprocating device,
A slide frame reciprocally connected to the membrane;
A rotor connected to the slide frame by an axis and rotating; And
And a motor that rotates the rotor and converts rotational motion through a connected shaft into a reciprocating motion of the slide frame. ≪ Desc / Clms Page number 13 > The method according to claim 1,
Wherein the impact load generated by the reciprocating device is reduced by the addition of a buffer between the slide frame and the shaft. 9. The method of claim 8,
Characterized in that the slide frame is variable along a slide rail carrying a linear bearing and a slide bearing support, the granular activated sludge and the membrane bioreactor. The method according to claim 1,
Characterized in that the movable membrane (Membrane) 500 is continuously moved while the supernatant in the granulation tank 200 is filtered or selectively moved as necessary in order to prevent contamination of the membrane. And a membrane bioreactor. delete The method according to claim 1,
Characterized in that the stirring means comprises an auxiliary circulation channel (437) for circulating the treated water through the sludge blanket from the upper part of the granulation tank to the lower part. 14. The method of claim 13,
Characterized in that the treated water is circulated through the auxiliary circulation channel (437) by a force generated by the movement of the membrane (Membrane) (500). Aeration step of injecting air into the raw water containing contaminants;
A granulating step of passing the floating microorganisms contained in the treated water passing through the aeration step and having a saturated dissolved oxygen amount; And
And a filtration step of removing the supernatant liquid through a movable membrane except for the slurry granulated in the granulating step,
Wherein the granulating step is performed by gelatin which is a by-product generated by contact of the floating microorganisms,
The inside of the granulating tank 200 in which the granulating step and the filtering step are performed is partitioned into upper and lower parts by partition walls 230 which are sloped rammel slopes at regular intervals,
In the lower part of the granulation tank, the sludge blanket formed by the granulated suspended microorganisms is stirred by the stirring means,
The movable film 500 moves back and forth or right and left reciprocatingly within the granulating tank 200 at the upper part of the granulating tank 200 to reduce the contamination of the membrane 500, By blocking the propagation of the turbulence to the lower portion caused by the movement of the membrane in the sludge blanket,
Characterized in that the operation of the stirring means of the granulation tank and the movement of the membrane are carried out by the same motor. 16. The method of claim 15,
The granulating step is performed by gelatin, which is a by-product generated by the contact of the floating microorganisms. The granulating step is performed by the hydrodynamic force of the process water conveyed through the aeration step and the second hydrodynamic force, Characterized in that the granular activated sludge and the membrane bioreactor are accelerated by a hydraulic force. delete 17. The method of claim 16,
The second hydraulic force is formed by an agitator 210 existing in the granulating tank 200 or an auxiliary circulating water channel 437 circulating the treated water through the sludge blanket to the lower part from the upper part of the granulating tank Wherein the granular activated sludge and the membrane bioreactor are made of a granular activated sludge and a membrane bioreactor. delete delete 16. The method of claim 15,
Characterized in that the movable membrane continuously moves during filtration of the supernatant in the granulating step or selectively moves as needed in order to prevent contamination of the membrane.

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