KR20120005804A - Filtration membrane and apparatus and method for treating waste water using the same - Google Patents

Abstract

PURPOSE: A filtration membrane, apparatus for treating sewage and wastewater using the same, and a method for treating the sewage and the wastewater using the same are provided to maximize the operational efficiency of the apparatus by rapidly eliminating pollutants attached on the surface of the membrane using a backwash water spraying unit. CONSTITUTION: A filtration membrane includes a plurality of cartridges(C) and a case frame receiving and supporting the cartridges. A cartridge includes membrane frame(81) with an opening, a membrane unit(82), and one or more permeate outlets(83). A permeate path is arranged in between the membrane unit and the membrane frame. The permeate outlets are in connection with the permeate path on the upper side of the membrane frame. The permeate outlets are in connection with a sucking pump through a water collecting pipe(84). The filtration membrane further includes a backwash water spraying unit spraying backwash water to the inner surface of the membrane unit.

Description

Separation membrane and apparatus and method for treating waste water using the same

The present invention relates to a separator and a sewage treatment apparatus using the same, and more particularly, to contaminants attached to the surface of a membrane member can be efficiently removed within a short time, thereby maximizing membrane separation efficiency, and treating sewage water. It is possible to improve the operation efficiency of the facility, and to maintain the construction without changing the existing facility, and to provide a separation membrane having excellent wastewater treatment performance while having low facility cost and operation cost, and a wastewater treatment apparatus using the same, and a method thereof. will be.

The conventional wastewater treatment system using a separation membrane includes a sedimentation tank and a screen tank for removing contaminants from the wastewater introduced as a pretreatment device, a flow rate adjustment tank for adjusting the flow rate of the waste water overflowed from the screen tank, and in the flow rate adjustment tank. A drum screen for filtering the wastewater introduced by adjusting the flow rate, an anaerobic tank for treating wastewater flowing through the drum screen in an anaerobic atmosphere while stirring with an agitation means, and anoxic while stirring the wastewater treated in the anaerobic tank with the stirring means. A positive reaction tank repeatedly operated in an aerobic-oxygen-free state, and a separation membrane tank for removing sludge by repeatedly operating in an oxygen-aerobic-aerobic anoxic state while stirring wastewater treated and introduced into the positive reaction tank with a stirring means, and in the separation membrane tank. Sludge is removed to prevent inflow of treated water It is known, including the discharge action that.

In the sedimentation tank and the screen tank, a relatively large contaminant in the incoming wastewater is removed to prevent blockage and damage of a pump, a pipe, and the like in a subsequent treatment step.

The flow rate adjusting tank controls the flow rate while stirring the inflow water from which the contaminants have been removed through the settling tank and the screen tank, and transfers the wastewater having a certain flow rate to the anaerobic tank where the next treatment step is to be performed.

The drum screen is to remove the fine solids in the waste water transported to the anaerobic tank in the flow rate adjustment tank to prevent the separation of the membranes and the like in the subsequent processing step.

In the anaerobic tank, dissolved organic matter is largely removed by assimilation, catabolism and phosphorus removal microorganisms by microorganisms.

In the positive reaction tank, anoxic-aerobic-anoxic states are repeatedly operated to induce denitrification during anoxic operation, and nitrification during aerobic operation to remove nitrogen and phosphorus by alternating operation thereof.

In the membrane tank, anoxic-aerobic-anoxic state is repeatedly operated, nitrifying untreated ammonia nitrogen and phosphorus intake reaction to reduce sludge by sludge reoxidation, and organic and inorganic contaminants and microorganisms by the membrane. The material to be treated is separated and removed.

However, such a conventional apparatus has a problem in that the long-term treatment of BOD and SS to 5 ppm or less is followed.

In addition, in the conventional apparatus, since the contaminants are removed using a drum screen, the treated water passed through the anaerobic tank and the positive reaction tank immediately flows into the membrane tank and is separated by the membrane, thereby shortening the life of the membrane.

In addition, in the conventional apparatus and method having a drum screen that uses electric power, there is a problem in that when the power is not supplied to the separation membrane tank in the form of a contaminant is not removed, causing fatal membrane damage to the separation membrane.

In addition, the conventional apparatus and method uses expensive drum screens, which increases the cost of the facility. If the drum screens are checked every day and the debris is not removed, the treatment water quality is significantly impaired. There is a problem that this cumbersome and increased operating cost.

On the other hand, the separation membrane used in the conventional wastewater treatment apparatus is a membrane frame constituting the rim, a membrane member adhered to the front and rear surfaces of the membrane frame and constituting a permeable water path between the membrane frame, and the permeable hydraulic diameter at the top of the membrane frame A cartridge having a permeate water outlet connected to the furnace; A collecting pipe connected to the permeate outlet; And a case for supporting the cartridge. An diffuser is installed below the case.

Such a conventional membrane is immersed in the membrane separation tank is a membrane fouling phenomenon to reduce the performance of the membrane by attaching particulate or dissolved contaminants on the membrane surface and pore surface in the process of treating the waste water.

Therefore, in order to remove membrane fouling, a method of using air diffused from the bottom of the separation membrane, a method of supplying backwash water, a method of removing the membrane from the membrane separation tank and washing it are used.

The method of using the air is a method of removing contaminants attached to the surface of the separator by using the air that is emitted to satisfy the aerobic conditions. However, this method has a problem that the power consumption is large, but the pollutant dropping efficiency is lowered because the air must be discharged in an extremely large amount compared to the air that is released to satisfy the aerobic condition.

In the method of supplying the backwash water, the backwash water is supplied into the permeation path of the separation membrane by a separate backwashing water supply means so that the backwash water penetrates the membrane member in a direction opposite to the permeation direction of the permeate during filtration of the membrane. It is a backwashing method to remove contaminants attached to the membrane member. However, the method of supplying the backwash water has a problem in that the backwash water is simply supplied into the permeate path of the separation membrane so that the efficiency of removing contaminants attached to the surface of the membrane member does not reach a satisfactory level within a short time.

In the method of removing the membrane from the membrane separation tank and washing the membrane, the operation efficiency of the wastewater treatment device is deteriorated since the operation of the wastewater treatment apparatus must be stopped in the process of removing the membrane from the membrane separation tank, washing and reinstalling the membrane. There is a problem.

Accordingly, an object of the present invention is to provide a separation membrane, a wastewater treatment apparatus using the same, and a method for maximizing operation efficiency of a wastewater treatment facility by dropping contaminants attached to the surface of a membrane member in a short time.

Another object of the present invention is to provide a separator and a sewage treatment apparatus using the same and a method for treating BOD and SS for 5 ppm or less for a long time.

Another object of the present invention is to provide a separator, a wastewater treatment apparatus using the same, and a method for extending the life of the separator twice.

It is still another object of the present invention to provide a separator, a sewage treatment apparatus using the same, and a method for preventing a fatal membrane damage to the separator even when no electric power is not supplied to the drum screen.

Another object of the present invention is to reduce the cost of the facility by not using an expensive drum screen, and even if you do not remove the contaminants from day to day checks every day to maintain the treatment performance of the waste water to reduce the operating cost and sewage water using the same It is to provide a processing apparatus and method thereof.

In order to achieve the above object, the present invention provides a membrane frame having an opening and constituting an edge; A membrane member adhered to front and rear surfaces of the membrane frame to form a permeable water path therebetween; A cartridge having one or more permeate outlets connected to the permeate path at the top of the membrane frame; A collecting pipe connected to the permeate outlet through a connection tube; A separator comprising a case for receiving and supporting the cartridge, the separator further comprising a backwash water spraying means for spraying backwash water to the inner surface of the membrane member in the permeate water path. .

The backwash water injection means includes a plurality of backwash water injection nozzles penetrating the left and right sides of the membrane frame, a header connected to the backwash water injection nozzle, and a backwash water supply pipe connecting the header to a backwash water supply source.

The present invention provides a sedimentation separation tank for sedimentation and separation of suspended solids from influent sewage to achieve the above object; A flow rate adjustment tank for adjusting and transferring a flow rate of the inflow water introduced from the precipitation separation tank; An anaerobic tank for purifying the inflow water introduced by the flow rate adjustment tank in an anaerobic atmosphere; An oxygen-free tank for purifying the inflow water introduced by the flow rate adjustment tank in an oxygen-free atmosphere; A final sedimentation tank for sedimenting sludge in the inflow water introduced and treated in the anaerobic tank and an anaerobic tank and discharging the supernatant water;

A curtain frame having a head and forming a rim; A membrane member adhered to front and rear surfaces of the membrane frame to form a permeable water path therebetween; A cartridge having one or more permeate outlets connected to the permeate path at the top of the membrane frame; A collecting pipe connected to the permeate outlet through a connection tube; And a case for accommodating and supporting the cartridge, wherein a separation membrane having a backwash water injection means for injecting backwash water from the inner surface of the membrane member toward the inner surface of the membrane member is immersed in the permeate water path. Separation membrane tank to remove the fine contaminants in the influent water flowing from the final settling tank by the separation membrane to discharge the purified water; And it provides a wastewater treatment apparatus using a separation membrane configured to include a discharge tank for discharging while storing the purified water flowing from the separation tank.

In addition, the present invention to achieve the above object, the pre-treatment step of introducing the sewage water introduced into the sedimentation separation tank to precipitate the suspended matter in the sewage water; A flow rate adjusting step of adjusting the flow rate of the inflow water processed in the pretreatment step and flowing into the flow rate adjusting tank; An anaerobic treatment step of purifying the inflow water flowing into the anaerobic tank at the flow rate adjusted in the flow rate adjusting step in an anaerobic atmosphere; An anoxic treatment step of purifying the inflow water flowing into the anoxic tank at the flow rate adjusted in the flow rate adjusting step in an oxygen-free atmosphere; An aeration treatment step of purifying the inflow water which is processed in the anaerobic and anoxic treatment step and flows into the aeration tank in an atmosphere that is alternated with an anaerobic-aerobic-anoxic atmosphere; A final sedimentation treatment step of sedimentation treatment of sludge in influent water which is treated in the aeration treatment step and flows into the final sedimentation tank; A separation membrane treatment step of removing the fine contaminants in the influent water introduced and processed in the final precipitation treatment step by a separation membrane; A discharge step of discharging while purifying the introduced purified water treated in the separation membrane treatment step; And spraying backwash water to the inner surface of the membrane member in the permeate water path formed between the membrane frame of each cartridge constituting the separation membrane and the membrane member adhered to the front and rear surfaces of the membrane. It provides a wastewater treatment method using a separation membrane comprising a backwashing step to eliminate contaminants.

In the separation membrane according to the present invention, since the backwash water is sprayed on the inner surface of the membrane member in the permeate path formed between the membrane frame and the membrane member, contaminants attached to the surface of the membrane member can be efficiently removed in a short time. It is possible to improve the efficiency of, and to maximize the operating efficiency of the sewage treatment system.

The wastewater treatment method using the membrane according to the present invention is to treat the wastewater through the sedimentation separation tank, flow control tank, anaerobic tank, anoxic tank, aeration tank and the final sedimentation tank and then finally remove the fine contaminants by the membrane of the membrane tank BOD and SS can be processed to 5 ppm or less and 3 ppm or less.

The sedimentation separation tank, flow rate adjustment tank, anaerobic tank, anoxic tank of the present invention is transferred directly to the separation membrane tank to remove the micro-contaminants by the separation membrane, the final sedimentation treatment through the aeration tank, the final sedimentation tank and then transferred to the separation membrane tank Since the micro-contaminants are removed by the separator, the life of the separator can be doubled.

Without using the drum screen using the electric power of the present invention, even if the power is not supplied, it will not cause fatal membrane damage to the separator.

The present invention does not use an expensive drum screen, the facility cost is reduced, and even if you do not remove the contaminants from time to time checks every day can maintain the treatment performance of the wastewater can reduce the operating cost.

1 is a schematic diagram showing a wastewater treatment apparatus using a separator according to the present invention,
2 to 6 show a first preferred embodiment of the separator according to the present invention,
2 is a full perspective view,
3 is a perspective view of the cartridge,
4 is an exploded perspective view of the cartridge,
5 is a longitudinal sectional front view of the cartridge;
6 is a cross-sectional view taken along the line AA of FIG.
7 is a flow chart showing a wastewater treatment method using a separation membrane according to the present invention.

Hereinafter, the wastewater treatment apparatus and method using the separator and the separator according to the present invention will be described in detail according to a preferred embodiment shown in the accompanying drawings.

The wastewater treatment apparatus using the separation membrane according to the present invention, as shown in Figure 1, the sedimentation separation tank 10 for removing suspended solids in the wastewater, and the flow rate adjusting tank 20 for adjusting the flow rate and transferring to the next step ), An anaerobic tank 30 and anoxic tank 40 to purify the influent in an anaerobic atmosphere and an anaerobic atmosphere, and an aeration tank 50 to purify the influent while repeating an anaerobic-aerobic and anoxic atmosphere, and sludge precipitation treatment The final sedimentation tank 60 for discharging the supernatant water, which is purified water, and the separation membrane M are immersed and discharged while storing the separation membrane tank 70 for removing the untreated micro contaminants in the previous step and the incoming purified water. And a bath 90.

The sedimentation separation tank 10 is a pretreatment tank, which separates and floats the suspended solids lighter than water from the incoming wastewater and settles the suspended solids heavier than the water.

The sedimentation tank 10 is provided with aeration means (11). The aeration means 11 is connected to the air line (L) of the air supply source (A) through the air supply pipe (11a).

A pipe (not shown) is installed between the sedimentation separation tank 10 and the flow rate adjustment tank 20 to transfer the treated water treated in the precipitation separation tank 10 to the next step, the flow rate adjustment tank 20.

The pipe is preferably installed so that the middle layer treated water, that is, the intermediate water of the sedimentation separation tank 10 is transferred to the flow rate adjusting tank 20 which is the next step. For example, when based on the water level 3M of the sedimentation tank 10, it is preferable to install a pipe (not shown) between the upper and lower ends 60 ~ 100cm, the installation height of the pipe is changed according to the processing capacity of the sedimentation separation tank 10, etc. It can be.

In addition, when a large amount of suspended solids in the sewage water may be installed in the preliminary step 12 of the sedimentation separation tank 10 to remove the suspended solids twice.

The sedimentation tank 12 may be configured as a screen tank 14 having a sedimentation separation tank 13 for sedimenting and separating the suspended solids and a screen 15 for filtering the suspended solids.

The flow rate adjusting tank 20 adjusts the flow rate while storing the treated water introduced by sedimentation separation of suspended solids in the sedimentation separation tank 10 to adjust the flow rate of the flow rate transferred to the anaerobic tank 30 and the anaerobic tank 40. To adjust.

The flow rate adjusting tank 20 is provided with aeration means 21 for preventing the inflow of water. The aeration means 21 is connected to the air line (L) of the air supply source (A) through the air supply pipe (21a).

In addition, the flow rate adjustment tank 20 is provided with a transfer pump 22 and a transfer pipe 23 for transferring the treated water to the next step. The transfer pipe 23 is branched into branch transfer pipes 23a and 23b for transferring the treated water of the flow rate adjustment tank 20 to the anaerobic tank 30 and the anaerobic tank 40, respectively.

The anaerobic tank 30 and the anaerobic tank 40 are purifying in an anaerobic and anoxic atmosphere, and are provided with anoxic agitation means 31 and 41. The oxygen-free stirring means (31) (41) is used to have an underwater motor and a stirring blade.

Between the anaerobic tank 30 and the anaerobic tank 40 and the aeration tank 50 is provided with a pipe (not shown) for transferring the treated water from the anaerobic tank 30 and the anaerobic tank 40 to the aeration tank 50.

The aeration tank 50 is to precipitate the sludge in the influent and discharge the supernatant water, which is purified water, and includes an aeration means 51 and a microbial carrier 52. The aeration means 51 is connected to the air line (L) of the air supply source (A) through the air supply pipe (51a).

Only one aeration tank 50 may be installed, but two or more aeration tanks may be installed to increase the quality of the treatment water.

The anaerobic tank 30 and the anaerobic tank 40 and the aeration tank 50, the aeration tank 50 and the aeration tank 50 may be connected by a pipe (not shown), respectively.

The final sedimentation tank 60 includes a supernatant water overflow wear 61 for carrying the monthly water supernatant to the separation membrane tank 70.

The aeration tank 50 and the final sedimentation tank 60 are connected by a pipe (not shown).

The final sedimentation tank 60 is provided with a sludge conveying pipe 62 for conveying sludge, a supernatant water conveying tube 63 and a sludge discharge pipe 64 for conveying the supernatant water.

The sludge conveying pipe 62 is branched into sludge conveying pipes 62a and 62b for conveying sludge to the anaerobic tank 30 and the aeration tank 50.

The supernatant conveying pipe 63 is for conveying the supernatant of the final settling tank 60 to the anaerobic tank 30.

The sludge discharge pipe 64 is for discharging the sludge in the final settling tank 60 to the sludge thickening tank 100, and is branched in the middle of the sludge conveying pipe 62.

Air supply pipes 65a and 65b are installed in the final settling tank 60. The air supply pipe 65a is for supplying air to the upper layer of the final settling tank 60, and the air supply pipe 65b is for supplying air to the lower layer of the final settling tank 60.

The air supply pipes 65a and 65b are connected to the air line L of the air supply source A.

The separator tank 70 includes a separator M, and the separator M is immersed.

As shown in FIG. 2, the separation membrane M includes a plurality of cartridges C and a case frame F for accommodating and supporting the plurality of cartridges C. As shown in FIG.

As shown in Figs. 3 to 6, the cartridge C has a membrane frame 81 having an opening 81a and forming an edge; A membrane member 82 bonded to front and rear surfaces of the membrane frame 81 to form a permeable water path P between the membrane frame 81 and the membrane frame 81; One or more permeate outlets 83 are connected to the permeate water path P at the upper end of the membrane frame 81.

In joining the membrane member 82 to the front and rear surfaces of the membrane frame 81, a method such as heat fusion is used.

The permeated water outlet 83 is connected to the suction pump P1 through a collecting pipe 84.

The case frame (F) is to determine the appearance of the separation membrane (M), it is configured to facilitate the immersion installation in the membrane separation tank (70). The diffuser 85 is provided below the case frame F.

The backwash water injection means for spraying the backwash water to the inner surface of the membrane member 82 in the permeate water path (P) further.

The backwash water injection means includes a plurality of backwash water injection nozzles 86 passing through the left and right sides of the membrane frame 81, a header 87 to which the backwash water injection nozzles 86 are connected, and the header 87. A backwash water supply pipe 88 is connected to the backwash water supply source (not shown). The backwash water supply pipe 88 is provided with a backwash water supply pump P2.

As shown in FIG. 6, the backwash water injection nozzle 86 is configured such that the backwash water can be directly sprayed on the inner surface of the membrane member 82.

The suction pump P1 and the suction pipe 71 are connected to the collecting pipe 84 of the separation membrane M. The suction pump P1 and the suction pipe 71 suck the treated water flowing into the separation membrane tank 70 so that the fine contaminants are separated and removed while passing through the separation membrane M. The suction pipe 71 is connected to the discharge tank (90).

The separation membrane tank 70 is provided with an air supply pipe 72 connected to the diffuser 85 of the separation membrane (M). The air supply pipe 72 is connected to the air line (L) of the air supply source (A).

The separation membrane tank (70) is provided with a defoaming water supply pump (73) and a defoaming water supply pipe (74) for conveying the purified water to the aeration tank (50).

The defoaming water supply pipe 74 is branched into two when two aeration tanks 50 are installed. The defoaming water supply means 74 is installed in the defoaming water supply means 74.

The defoaming water sprinkling means 75 may be configured as a sprinkling nozzle for sprinkling the defoaming water supplied from the defoaming water supply pipe 74 to the water surface of the aeration tank 50.

The discharge tank 90 is provided with aeration means 91, the aeration means 91 is connected to the air line (L) of the air supply source (A) through the air supply pipe (91a).

The sludge concentration tank 100 is provided with an air supply pipe 101, the air supply pipe 101 is connected to the air line (L) of the air supply source (A). The sludge concentration tank 100 includes a sludge conveying pipe 102 for conveying sludge to the flow rate adjusting tank 20.

Hereinafter, the wastewater treatment method using the separator according to the present invention will be described.

The wastewater treatment method using the separator according to the present invention includes a pretreatment step, a flow adjusting step, an anaerobic treatment step, an anoxic treatment step, an aeration treatment step, a final sedimentation treatment step, a membrane treatment step and a membrane backwash step.

[Preprocessing Step]

In the pretreatment step (A), sedimentation and separation of the influent (wastewater) is carried out to precipitate the suspended matter.

That is, among the suspended solids contained in the sewage water introduced into the sedimentation tank 10, the suspended solids lighter than the water will float and the suspended solids heavier than the water will settle and the suspended solids are separated.

At this time, the aeration means 11 installed in the sedimentation separation tank 10 and connected to the air line L of the air supply source A by the air supply pipe 11a is operated to aeration to air to the wastewater in the sedimentation separation tank 10. Supply (oxygen) to prevent corruption of sewage water.

The treated water treated by sedimentation separation in the sedimentation separation tank 10 is transferred to the flow rate adjustment tank 20, which is the next step, through the pipe (not shown).

Here, the middle layer refers to a layer between the upper and lower ends of 60 to 100 cm based on the water level of 3M of the sedimentation separation tank 10, but is not necessarily limited thereto.

On the other hand, if a large amount of suspended solids contained in the sewage water may be provided by the settling tank 12 in the previous step of the sedimentation separation tank 10 to remove the suspended solids double.

The sedimentation tank 12 is composed of a sedimentation separation tank 13 and a screen tank 14, the sedimentation separation tank 13 in the sedimentation of suspended solids, the screen tank 14 in the floating by the screen 15 The material is filtered off.

[Flow adjustment step]

In the flow rate adjusting step (B), while storing the treated water introduced by the sedimentation separation process in the sedimentation separation tank 10, the flow rate is adjusted while transferring the treated water to the anaerobic tank 30 and the anaerobic tank 40.

The flow rate adjusting tank 20 adjusts the flow rate while storing the treated water introduced by sedimentation separation of suspended solids in the sedimentation separation tank 10 to adjust the flow rate of the flow rate transferred to the anaerobic tank 30 and the anaerobic tank 40. To adjust.

The flow rate adjustment in the flow rate adjustment tank 20 and the transfer to the anaerobic tank 30 and the anaerobic tank 40 is made by the transfer pump 22, the transfer pipe 23 and the branch transfer pipe (23a) (23b).

At this time, the treatment water in the flow adjustment tank 20 by aeration of the aeration means 21 installed in the flow adjustment tank 20 and connected to the air line L of the air supply source A through the air supply pipe 21a. Air (oxygen) is supplied to prevent decay of the treated water.

Anaerobic and Anaerobic Treatment Steps

In the anaerobic and anoxic treatment step (C) (D), the treated water introduced into the anaerobic tank 30 and the anoxic tank 40 is purged in an anaerobic atmosphere and an anoxic atmosphere while stirring by the anoxic stirring means 31 and 41.

The anaerobic treatment in the anaerobic tank 30 and the anaerobic treatment in the anaerobic tank 40 are each independently performed.

The treated water treated in the anaerobic and anaerobic treatment step is transferred to the aeration tank 50 through a pipe (not shown).

[Aeration process step]

In the aeration treatment step (E), the treated water introduced into the aeration tank 50 is purged by repeating operation in an anaerobic-aerobic-anoxic state.

At this time, the aeration in the aeration tank 50 is installed in the aeration tank 50 to operate the aeration means 51 connected to the air line (L) of the air supply source (A) through the air supply pipe (51a), When the aeration tank 50 becomes an aerobic atmosphere and the aeration means 51 is stopped, the aeration is stopped and the aeration tank 50 is in an oxygen-free atmosphere.

In addition, the microorganisms in the microorganism carrier 52 installed in the aeration tank 50 ingest organic substances that are pollutants as nutrients, and purify the treated water introduced by oxidatively decomposing water, gas, and various inorganic substances with oxygen ingested in an aerobic atmosphere. Done.

When the aeration treatment step is not possible to derive the desired water quality only by performing in one aeration tank 50, a plurality of aeration tanks 50 (two in the illustrated example) are installed in series to perform the aeration treatment step of a plurality of stages. Can go through. In addition, up to four aeration tanks 50 may be provided.

In this case, after the aeration treatment in the first aeration tank, the supernatant water is transferred to the second aeration tank, whereby more stable water quality can be obtained.

[Final Settling Step]

In the final sedimentation treatment step (F), the treated water introduced into the final sedimentation tank 60 is precipitated. At this time, the sludge is settled and only the purified water is uppered (上 騰).

Most of the supernatant of the final sedimentation tank 60 is transferred to the separation membrane tank 70 through the overflowware 61, and part of the supernatant water is returned to the anaerobic tank 30 through the supernatant water conveying pipe 63.

In addition, most of the sludge deposited in the final settling tank 60 is discharged to the sludge thickening tank 100 through the sludge conveying pipe 62 and the sludge discharge pipe 64, a part of the sludge conveying pipe 62 and the sludge conveying pipe 62 ) Is conveyed to the anaerobic tank 30 and the aeration tank 50 through the sludge conveying pipes 62a and 62b branched off from each other.

At this time, the dissolved oxygen is increased by supplying air (oxygen) through the air supply pipes 65a and 65b to the sludge sedimentation portion of the lower layer and the upper supernatant surface of the upper layer.

[Membrane treatment step]

In the separation membrane treatment step (G), the suction pump P1 is operated to remove the fine contaminants untreated in the previous step while the treated water flowing into the separation membrane tank 70 passes through the separation membrane M, and the purified water is suction tube 71. The discharge through the discharge tank (90).

At this time, when the suction pump P1 is operated, the treated water outside the permeate water path P of the separation membrane M is filtered while passing through the membrane member 82, and the filtered water is filtered through the permeate water path P. It is introduced, and is discharged to the discharge tank 90 through the permeated water outlet 83, the collection pipe 84 and the suction pipe 71.

In the separation membrane tank 70, the air (oxygen) supplied through the air supply pipe 72 connected to the air line L of the air supply source A is diffused from the diffuser 85 installed under the separation membrane M. It is supplied to agitate the treated water in the separation membrane tank 70 to increase the separation treatment efficiency by the separation membrane (M).

On the other hand, a part of the purified water treated in the separation membrane tank 70 is a defoaming water spraying means 75 consisting of a defoaming water spray nozzle installed in the aeration tank 50 through the defoaming water supply pump 75 and the defoaming water supply pipe 74 Water is sprayed on the surface of the treated water in the aeration tank 50 to remove bubbles in the surfactant state.

[Release step]

In the discharge step (H), the purified water discharged from the separation membrane tank 70 is discharged to a river or the like while being stored in the discharge tank 90. At this time, the air (oxygen) is supplied to the purified water in the discharge tank 90 by the aeration means 91 installed in the discharge tank 90 and connected to the air line L of the air supply source A through the air supply pipe 91a. To increase the dissolved oxygen of the purified water.

[Backwash Step]

In the membrane backwashing step (I), contaminants attached to the surface of the membrane member 82 in the aforementioned membrane treatment step are removed to restore and maintain the function of the membrane member 82.

In the membrane backwashing step (I), the backwash water supply pump P2 of the membrane M is operated so that the backwash water passes through the backwash water supply pipe 88, the header 87, and the backwash water injection nozzle 86. The contaminants adhered to the surface of the membrane member 82 are dropped by spraying the inner surface of the membrane member 82 in the water path P.

The backwash water supplied to the backwash water supply pipe 88 by the backwash water supply pump P2 is first supplied to the header 87, and the backwash water supplied to the header 87 is connected to the header 87. It is injected into the permeate water path (P) through the backwash water injection nozzle (86).

At this time, the backwash water sprayed from the backwash water spray nozzle 86 is sprayed in an inclined state without being sprayed at right angles to the inner surface of the membrane member 82.

Since the backwash water sprayed from the backwash water injection nozzle 86 is sprayed toward the membrane member 82, the contaminants attached to the surface of the membrane member 82 drop off in a short time. Therefore, it is possible to shorten the operation stop time of the wastewater treatment system for backwashing, thereby increasing the operating efficiency.

In addition, in the membrane backwashing step, the backwash water is sprayed on the inner surface of the membrane member 82 by the above backwash water spraying means and aerated by the diffuser 85 to contaminate the surface of the membrane member 82. Dropping of the material becomes more effective.

[Other steps]

The sludge concentrated in the sludge thickening tank 100 is supplied with air (oxygen) through the air supply pipe 101 connected to the air line L of the air supply source A to prevent the concentrated sludge from decaying.

In addition, the concentrated sludge of the sludge thickening tank 100 is conveyed to the flow rate adjusting tank 20 through the sludge conveying pipe 102.

As a result of the experiment, the water quality of the supernatant treated in the final settling tank 60 was 5ppm for BOD and SS, respectively, and the quality of the purified water treated in the separation tank 70 was 3ppm for BOD and SS, respectively.

In the above described the present invention as a preferred embodiment, with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings presented in the present specification, the corresponding companies within the scope of the technical spirit of the present invention Of course, various modifications may be made.

10: sedimentation separation tank 20: flow rate adjustment tank
30: anaerobic tank 40: anaerobic tank
50: aeration tank 60: final sedimentation tank
70: separator membrane M: separator
81: membrane frame 82: membrane member
83: permeate outlet 84: collecting pipe
85: diffuser 86: backwash jet nozzle
87: header 88: backwash water supply pipe
P1: suction pump P2: backwash water supply pump
90: discharge tank 100: sludge thickening tank

Claims (4)

A curtain frame having an opening and constituting an edge; A membrane member adhered to front and rear surfaces of the membrane frame to form a permeable water path therebetween; A cartridge having one or more permeate outlets connected to the permeate path at the top of the membrane frame; A collecting pipe connected to the permeate outlet through a connection tube; In the separator comprising a case for receiving and supporting the cartridge,
Separation membrane, characterized in that further comprising a backwash water injection means for injecting a backwash water to the inner surface of the membrane member in the permeate water path. The method of claim 1,
The backwash water injection means includes a plurality of backwash water injection nozzles penetrating the left and right sides of the membrane frame, a header connected to the backwash water injection nozzle, and a backwash water supply pipe connecting the header to a backwash water supply source. Separation membrane.
A sedimentation separation tank for sedimentation and separation of suspended solids from the introduced sewage water;
A flow rate adjustment tank for adjusting and transferring a flow rate of the inflow water introduced from the precipitation separation tank;
An anaerobic tank for purifying the inflow water introduced by the flow rate adjustment tank in an anaerobic atmosphere;
An oxygen-free tank for purifying the inflow water introduced by the flow rate adjustment tank in an oxygen-free atmosphere;
A final sedimentation tank for sedimenting sludge in the inflow water introduced and treated in the anaerobic tank and an anaerobic tank and discharging the supernatant water;
A curtain frame having a head and forming a rim; A membrane member adhered to front and rear surfaces of the membrane frame to form a permeable water path therebetween; A cartridge having one or more permeate outlets connected to the permeate path at the top of the membrane frame; A collecting pipe connected to the permeate outlet through a connection tube; And a case for accommodating and supporting the cartridge, wherein a separation membrane having a backwash water injection means for injecting backwash water from the inner surface of the membrane member toward the inner surface of the membrane member is immersed in the permeate water path. Separation membrane tank to remove the fine contaminants in the influent water flowing from the final settling tank by the separation membrane to discharge the purified water; And
Wastewater treatment apparatus using a separator comprising a discharge tank for discharging while storing the purified water flowing in the separation tank.
A pretreatment step of introducing the sewage water introduced into the sedimentation separation tank to precipitate the suspended matter in the sewage water; A flow rate adjusting step of adjusting the flow rate of the inflow water processed in the pretreatment step and flowing into the flow rate adjusting tank; An anaerobic treatment step of purifying the inflow water flowing into the anaerobic tank at the flow rate adjusted in the flow rate adjusting step in an anaerobic atmosphere; An anoxic treatment step of purifying the inflow water flowing into the anoxic tank at the flow rate adjusted in the flow rate adjusting step in an oxygen-free atmosphere; An aeration treatment step of purifying the inflow water which is processed in the anaerobic and anoxic treatment step and flows into the aeration tank in an atmosphere that is alternated with an anaerobic-aerobic-anoxic atmosphere; A final sedimentation treatment step of sedimentation treatment of sludge in influent water which is treated in the aeration treatment step and flows into the final sedimentation tank; A separation membrane treatment step of removing the fine contaminants in the influent water introduced and processed in the final precipitation treatment step by a separation membrane; A discharge step of discharging while purifying the introduced purified water treated in the separation membrane treatment step; And spraying backwash water to the inner surface of the membrane member in the permeate water path formed between the membrane frame of each cartridge constituting the separation membrane and the membrane member adhered to the front and rear surfaces of the membrane. Wastewater treatment method using a separator comprising a backwashing step to eliminate contaminants.

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