KR101068205B1 - Mbr tank assembly for decreasing fouling - Google Patents

Abstract

An MBR bath assembly for reducing fouling is disclosed. The MBR tank assembly includes a plurality of MBR tanks including a housing partitioned at the rear end of the aerobic tank and a membrane bioreactor (MBR) installed inside the housing to receive and process water from the aerobic tank, At least one of a blower for supplying cleaning air to the membrane bioreactor, a suction pump for sucking the treated water from the membrane bioreactor, and a backwash pump for pressurizing and supplying water for washing the membrane bioreactor are It is installed for each MBR tank, and the blower, the suction pump or the backwash pump is individually controlled for each of the MBR tanks.

Description

MBR tank assembly for decreasing fouling

The present invention relates to an MBR bath assembly, and more particularly to the structure of the MBR bath assembly for reducing fouling.

In general, wastewater containing organic pollutants, nitrogen, and phosphorus depletes dissolved oxygen in the water, destroying the aquatic ecosystem, and eutrophicating the water in lakes and reservoirs. Therefore, in order to prevent water pollution in rivers, contaminants and organic nutrients contained in the waste water should be removed before they enter the body of the river or the like.

As a treatment method of wastewater treatment facility to remove this, many biological treatment methods which are excellent in economics are applied. Among the biological treatment methods, organic materials using microorganisms such as activated sludge method and advanced treatment are removed, but they are grown in the process of removing organic materials. Microorganisms are generated as waste sludge.

As a representative biological treatment method, activated sludge method grows as microorganisms ingest and decompose organic matter in the wastewater and proceed to nitrification as waste water is continuously injected into the aeration tank. As a result, some of the precipitate is returned to the aeration tank in the form of activated sludge, and some excess sludge is discarded to maintain an appropriate level of microorganisms in the aeration tank to remove nitrogen, phosphorus, etc. together with organic matter decomposition in the wastewater.

This activated sludge method combines with membrane bio-reactor to keep microorganisms at high concentration, increasing organic matter, nitrogen and phosphorus treatment efficiency, and preventing sludge bulking and sedimentation efficiency deterioration that may occur due to settling basin. Doing.

In general, a plurality of membrane bioreactors are installed in an aerobic tank or a plurality of membrane bioreactors are installed in the membrane bioreactor by connecting a separate membrane bioreactor to the rear end of the aerobic tank.

Sludge generated during the treatment of liquids and suspended solids using membrane bioreactors adheres to the surface of the separator to form a cake layer, which causes membrane fouling.

In the membrane bioreactor unit, the immersed membrane (membrane) is composed of a microfiltration membrane having a micropores of 0.01 ~ 0.2㎛, the organic material and suspended matter is processed through the immersion membrane.

Sludge, which is generated during the treatment of organic and suspended substances, adheres to the surface of the separator and forms a cake layer, causing membrane fouling. Therefore, the sludge generated from the aeration unit is exposed to strong air bubbles emitted from the aeration unit. As a result, membrane contaminants in the immersion type membrane can be efficiently removed while maintaining the concentration of oxygen in the reaction tank, and the overall organic material-containing wastewater treatment can be efficiently performed.

In addition, since there is a limit in removing sludge deposited on the surface of the membrane by the diffuser, periodic backwashing of the micropores is performed to completely remove the phenomenon of blocking the pores of the membrane by the sludge. have.

Meanwhile, in a conventional water treatment system, a plurality of membrane bioreactors are installed in an MBR tank located inside or at an end of an aeration tank, and a plurality of branch pipes branched from one cleaning air supply pipe connected to one blower are provided with each MBR diffuser. Is connected to.

In addition, a suction pump for pulling out the treated water or a backwash pump for backwashing are also provided one by one, thereby sucking the treated water in the entire MBR or supplying the washing water.

According to such a conventional water treatment system, the cleaning air supplied from one blower cannot be supplied at a uniform pressure to each MBR due to the distance difference according to the arrangement of each MBR, and in some cases, sufficient pressure is applied to the MBR located far from the blower. The cleaning air may not be supplied. As a result, fouling occurs because the sludge that adheres to the surface of the separator to form a cake layer cannot be efficiently removed.

Similarly, in case of the MBR located far from one suction pump, the suction power of the suction pump is not sufficient to draw water through the micropores of the separation membrane so that sludge builds up in the micropores, thereby increasing fouling.

In addition, in case of the MBR located at a distance from one backwash pump, the discharge force of the backwash pump may not be sufficient, so that sludge blocking the micropores of the separator may not be effectively removed and fouling may not be reduced.
In addition, all MBRs are commonly connected to the blowers, suction pumps and backwash pumps, so that the blowers, suction pumps and backwash pumps cannot be controlled individually in response to each MBR. There is a problem that can not control.

Accordingly, it is an object of the present invention to provide an MBR bath assembly that can efficiently reduce fouling.

The above object includes a plurality of MBR tanks including a housing partitioned at the rear end of the aerobic tank and one membrane bioreactor (MBR) installed in the housing and receiving and treating water from the aerobic tank. At least one of a blower for supplying cleaning air to the membrane bioreactor, a suction pump for sucking the treated water from the membrane bioreactor, and a backwash pump for pressurizing and supplying water for washing the membrane bioreactor may be used. Installed in each tank, the blower, the suction pump or the backwash pump is achieved by the MBR tank assembly for fouling reduction, characterized in that each is controlled individually for the MBR tank.

Preferably, a chamfer having a constant inclination angle may be formed along the bottom edge edge of the housing.

In addition, an overflow recovery pipe may be installed at one side of the housing, and a mesh screen having a hole having a predetermined size may be installed adjacent to the inlet of the overflow recovery pipe.

Preferably, a bubbler for emitting air bubbles may be installed at the bottom of the mesh screen.

Preferably, a suspended solids measuring sensor for measuring the amount of suspended solids involved in fouling of the surface of the separator installed inside the housing may be installed.

Further, preferably, the aerobic tank may be provided with an organic concentration measurement sensor for measuring the organic concentration involved in fouling of the surface of the separator installed inside the housing.

Preferably, a support skid is formed on an upper portion of the housing, and the blower, suction pump, or backwash pump is installed on the support skid, and a portion except the support skid is opened, and a flexible corrugated opening / closing door is provided therein. Can be installed.

Preferably, a leak sensor may be installed at the discharge port of the suction pump to check whether the sludge is contained in the treated water discharged from the suction pump and stop the operation of the suction pump.

In addition, preferably, the front of the suction pump is installed to measure the pressure across the suction pump by installing a differential pressure gauge, the operation of the suction pump can be stopped when the measured pressure is more than the reference value.

Preferably, the exhaust port is formed in the side wall or the upper wall corresponding to the space on the water surface in each housing, each exhaust port is connected to a common exhaust pipe, the exhaust fan may be installed at the end of the exhaust pipe.

Preferably, a fixed vibrator having one end fixed vertically or horizontally is installed between the membranes of the membrane unit of the membrane bioreactor to vibrate by the cleaning air supplied by the blower to remove fouling deposited on the membrane surface. Can be.

Preferably, the fixed vibrator may be a spring-shaped vibrator, a vibrator connecting a plurality of balls, a strip-shaped vibrator having a wave shape, or a strip-shaped vibrator bent in an S shape.

According to the above arrangement, each housing is arranged independently, and a blower for supplying cleaning air to each housing is independently installed to provide the cleaning air at a sufficient pressure to the MBR of each housing, thereby adhering the cake layer to the membrane surface of the MBR. The sludge to be formed can be removed efficiently.

In addition, by the suction pump installed in each housing independently, it is possible to draw water from the MBR of each housing with sufficient suction force, so that sludge does not accumulate in the micropores.

In addition, the backwash pump can also be installed in each housing independently to provide sufficient discharge power to effectively remove the sludge blocking the micropores of the MBR separator.
Furthermore, the blower, suction pump, or backwash pump can be installed independently in correspondence with each MBR, so that they can be individually controlled.

1 is a device connection diagram showing a water treatment system according to the present invention.
2 shows an example of an MBR bath according to the present invention.
3 shows various stationary vibrators.

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

1 is a device connection diagram showing a water treatment system according to the present invention, Figure 2 shows an example of the MBR tank according to the present invention.

The MBR tank of the present invention is separated and installed at the rear end of the aerobic tank 100 Housing 200, 202, 204, 206 and MBR 300 housed in each housing 200, 202, 204, 206. 1 shows four housings 200, 202, 204, and 206 for convenience of illustration, but is not limited thereto.

The housings 200, 202, 204, and 206 form a tank for storing the water supplied from the aerobic tank 100, the upper part of which is open and the other part of the housing 200 being sealed.

Each housing 200, 202, 204, 206 is separately separated and installed, and blowers 510 , 512, 514, 516 corresponding to the MBR 300 housed in each housing 200, 202, 204, 206 ), Suction pumps 530, 532, 534, 536, or backwash pumps 520, 522, 524, 526 are installed.

In this embodiment, as illustrated in FIG. 2, the blower 510, the suction pump 530, and the backwash pump 520 are all installed corresponding to one MBR 300, but are arbitrarily combined and installed. Can be. For example, only one of the blower 510, the suction pump 530, and the backwash pump 520 is installed in each housing 200, 202, 204, 206, or a combination of the two may be installed in each housing 200, 202, 204, 206, or all three may be installed in each housing 200, 202, 204, 206.

In addition, the chemical pump 540 connected to the chemical bath 600 is commonly connected to the backwash pumps 520, 522, 524, and 526.

Blower, suction pump and backwash pump, for example, as shown in Figure 2, may be installed on the upper portion of the housing 200 by the support skid 340, which will be described later.

According to this structure, each of the housings 200, 202, 204, and 206 are disposed independently, and blowers 510, 512, 514, and 516 for supplying cleaning air to the housings 200, 202, 204, and 206 are provided. Independently installed, the cleaning air is provided to the MBR of each of the housings 200, 202, 204, and 206 at a sufficient pressure to efficiently remove the sludge that adheres to the membrane surface of the MBR to form a cake layer.

In addition, the suction pumps 530, 532, 534, and 536 independently installed in the housings 200, 202, 204, and 206 provide sufficient suction force from the MBR 300 of each of the housings 200, 202, 204, and 206. It can attract water, preventing sludge from accumulating in the micropores.

In particular, backwash pumps 520, 522, 524, and 526 are also installed in each housing 200, 202, 204, and 206 independently to provide sufficient discharge power to effectively remove sludge blocking the micropores of the MBR separator. Can be.

In this way, by installing the blower, suction pump, or backwash pump independently of each MBR 300, fouling can be significantly reduced. In addition, since blowers, suction pumps or backwash pumps can be installed independently in correspondence with each MBR 300 to control them individually, optimum control can be performed according to the state of the membrane surface of each MBR 300. have.

Referring back to FIG. 1, the water supply pipe 110 starting from the aerobic tank 100 is branched corresponding to each housing 200, 202, 204, and 206, and a flow meter may be installed in the branch pipe.

In addition, the suction branch pipes 220, 222, 224, and 226 connected to the separator unit 310 of the MBR 300 of the housings 200, 202, 204, and 206 are respectively suction pumps 530, 532, 534, 536 and backwash pumps 520, 522, 524, 526 are connected in parallel.

A common filtrate discharge pipe 230 is connected to the rear end of the suction pumps 530, 532, 534, and 536, and the water treated in the MBR 300 is discharged to the treatment water tank 700 through the filtrate discharge pipe 230.

Here, the differential pressure gauges 220a, 222a, 224a, and 226a are installed in the suction branch pipes 220, 222, 224, and 226. When a large amount of sludge builds up on the membrane surface of the membrane unit 310, the suction pump (530, 532, 534, 536) in the suction of the treated water from the membrane unit 310 may damage the membrane. Therefore, the differential pressure gauges 220a, 222a, 224a, and 226a are installed in the suction branch pipes 220, 222, 224, and 226, and the pressure applied to the suction pumps 530, 532, 534, and 536 is measured, for example, 400 mm. In the case of more than bar, the operation of the suction pumps 530, 532, 534, and 536 may be stopped.

Also, leak sensors 530a, 532a, 534a, and 536a may be installed at discharge ports of the suction pumps 530, 532, 534, and 536. The leak sensors 530a, 532a, 534a, and 536a check whether sludge is contained in the treated water discharged from the suction pumps 530, 532, 534, and 536. The suction pumps 530, 532, 534, and 536 are deactivated by determining that the operation is performed. In the same principle, the leak sensors 530a, 532a, 534a, and 536a may be installed in front of the suction pumps 530, 532, 534, and 536.

Referring to FIG. 2, one MBR 300 is installed inside the housing 200. The air diffuser unit 320 is installed on the support base 330 in contact with the bottom of the housing 200, and a separator unit 310 fixed to a frame (not shown) is installed thereon.

One side of the diffuser unit 320 inside the housing 200 is connected with a pipe 311 for supplying cleaning air, and one side of the separation membrane unit 310 is connected with a pipe 322 for discharging the sludge-treated water. . The pipe 322 is also used as a pipe for backwashing the membrane unit 310.

The pipe 311 connected to the air diffuser unit 320 is connected to the cleaning air supply pipes 210, 212, 214, and 216 of FIG. 1, and the pipe 322 connected to the separator unit 310 is a suction branch pipe 220, 222. , 224, 226.

The overflow recovery pipe 130 (the other housing, see 132, 134, and 136 of FIG. 1) is connected to the upper portion of the housing 200, and the drain pipe 140 is connected to the overflow recovery pipe 130. ) And the drain pipe 140 are connected to each other.

According to this embodiment, the upper portion of the housing 200 is opened and extending support skids 340 and 342 having a constant length from both edges, a flexible and flexible opening and closing door between the support skids 340 and 342, For example, the corrugated opening and closing door 350 may be installed to prevent the odor from leaking to the outside.

Preferably, as shown in FIG. 1, in each of the housings 200, 202, 204, and 206, an exhaust port is formed at a side wall or an upper portion corresponding to the space on the surface of the water, and each exhaust port is connected to the exhaust pipe 360. An exhaust fan 362 is installed at the end of 360.

According to this structure, the odor remaining in the housings 200, 202, 204, and 206 by the corrugated opening / closing door 350 can be sucked using the exhaust fan 362 to be exhausted to the outside.

The support skid 340 is provided with a blower 510, a backwash pump 520, a suction pump 530, and a chemical pump 540. Here, the installation position and arrangement of the blower 510, the backwash pump 520, the suction pump 530, and the chemical pump 540 and piping related thereto are just one embodiment and may be appropriately changed by those skilled in the art. Of course it can. For example, the chemical pump 540 may be separately installed on the ground.

According to the present invention, a chamfer 250 is installed at a predetermined inclination angle along the bottom edge of the housing 200.

According to this structure, the MCP (mechanical cleaning process) ball or fluid carrier 10 for the MCP (Mechanical Cleaning Process) which is in physical contact with the surface of each membrane of the membrane unit 310 by preventing the phenomenon of collecting at the bottom edge corners for MCP Washing balls or flowable carriers 10 can be used efficiently, thereby reducing fouling.

Specifically, the washing ball or the fluid carrier 10 for the MCP is swept away by the air bubbles rising from the air diffuser unit 320 to rise inside the membrane unit 310 to descend largely convection outside the MBR (300). At this time, the bottom edge edge of the housing 200 has almost no force due to convection, so the washing ball or the fluid carrier 10 for the MCP located in this portion does not convection but only stops or rotates locally. It can not be used, so the efficiency of use is reduced.

Accordingly, the inclined chamfer 250 is installed in this portion, and as shown by the arrow in FIG. 2, the washing ball or the fluid carrier 10 for the MCP moves along the inclination of the chamfer 250 to move the To the lower part.

The chamfer 250 may attach a separate inclined plate by welding or the like, or may be integrally formed with the housing 200.

A fixed vibrator may be used to reduce fouling of the membrane surface of the membrane unit 310 without using the washing ball or the fluid carrier 10 for the MCP in this embodiment.

2, a fixed vibrator 312 having one end fixed between the separators of the separator unit 310 is installed vertically or horizontally. In this example, the shape of the fixed vibrator 312 is a spring shape, but is not limited thereto, and as shown in FIG. 3, the vibrator 314 connecting a plurality of balls, a strip-shaped vibrator 316 having a wave shape, or A strip shaped vibrator 318 or the like curved in S-shape may be applied.

The fixed vibrators 312, 314, 316, and 318 may vibrate by air bubbles ejected from the air diffuser unit 320 to efficiently remove fouling deposited on the surface of the separator.

Meanwhile, referring to FIG. 2, a mesh screen 410 having a hole having a predetermined size is installed adjacent to the inlet of the overflow recovery pipe 130 in the housing 200, so that the sludge is overflow overflow pipe 130. When it is discharged through) to prevent the washing ball or the fluid carrier 10 for the MCP is discharged together to increase the use efficiency of the washing ball or the fluid carrier 10 for MCP to reduce fouling.

Also, in order to prevent the washing ball or the fluid carrier 10 for the MCP from being attached to the mesh screen 410 to prevent sludge discharge, the bubbler 400 may be attached to the bottom of the mesh screen 410 to prevent bubbles. Air bubbles emitted from the lubricator 300 may cause the washing ball or the flowable carrier 10 for the MCP to be separated from the mesh screen 410.

For example, the air discharged from the bubbler 300 may be supplied by the blowers 510, 512, 514, and 516 as shown in FIG. 1.

According to the present invention, each housing 200, 202, 204, 206 may be provided with a suspended matter measuring sensor 20 for measuring the amount of suspended solids involved in fouling of the separator surface. .

According to this structure, when the amount of the suspended solids measured by the suspended solids measuring sensor 20 exceeds the reference value, the MBR tank can be shut down to prevent excessive fouling in the corresponding MBR tank. have.

In addition, the aerobic tank 100 may be provided with an organic concentration measurement sensor for measuring the organic concentration involved in fouling. That is, the organic matter concentration of the water supplied from the exhalation tank 100, for example, BOD, COD or TOC is measured, if the reference value is higher than the inflow of water supplied from the exhalation tank 100 to the MBR tank, each housing (200, 202) only if the reference value or less 204, 206).

According to this configuration, it is possible to prevent water having a high organic matter concentration to flow in to reduce the membrane life of the MBR 300 and to increase fouling.

In addition, the housing 200 may be configured as a thermostat. In general, fouling increases as the water temperature drops, so that fouling may be further reduced if the water temperature inside the housing 200 is maintained at about 25 ° C to 30 ° C. A method of maintaining a constant water temperature is widely known, and for example, the outer surface of the housing 200 may be wrapped using a water jacket.

Hereinafter, the operation of the water treatment system having the above structure will be described with reference to FIGS. 1 and 2.

Water supplied from the exhalation tank 100 is supplied to each of the housings 200, 202, 204, and 206 through the water supply pipe 110.

When the suction pumps 530, 532, 534, and 536 are driven, the negative pressure is applied to the suction branch tubes 220, 222, 224, and 226 so that water is forced through the micropores formed in the MBR 300. Inflow, microorganisms are filtered out.

In the above described the center of the preferred embodiment of the present invention, various changes or modifications are possible at the level of those skilled in the art. Therefore, the scope of the present invention should not be construed as being limited to the above embodiments but should be interpreted by the claims described below.

100: aerobic tank
110: supply pipe
130: overflow recovery pipe
140: drain pipe
200, 202, 204, 206: housing
210, 212, 214, 216: cleaning air supply pipe
220, 222, 224, 226: suction branch pipe
230: filtered water discharge pipe
300, 302, 304, 306: MBR
310: separator unit
320; Air diffuser unit
400: screen bubbler
410: mesh screen
510, 512, 514, 516: blowers
520, 522, 524, 526: backwash pump
530, 532, 534, 536: suction pump
540: chemical pump
530a, 532a, 534a, 536a: leak sensor
220a, 222a, 224a, 226a: differential pressure gauge
312, 314, 316, 318: Fixed Vibrators

Claims (13)

It includes a plurality of MBR tank including a housing partitioned to each other at the rear end of the aerobic tank, and one membrane bioreactor (MBR) installed in the housing and receiving water from the aerobic tank independently.
At least one of a blower for supplying cleaning air to the membrane bioreactor, a suction pump for sucking the treated water from the membrane bioreactor, and a backwash pump for pressurizing and supplying water for washing the membrane bioreactor are Installed every MBR group,
The blower, the suction pump or the backwash pump is MBR tank assembly for reducing fouling, characterized in that each of the MBR tank is controlled individually. The method according to claim 1,
MBR bath assembly for reducing fouling, characterized in that the chamfer (chamfer) having a constant inclination angle is formed along the bottom edge edge of the housing. The method according to claim 1,
MBR tank assembly for reducing fouling, characterized in that the overflow recovery pipe is installed on one side of the housing, and a mesh screen having a hole of a predetermined size is installed adjacent to the inlet of the overflow recovery pipe. . The method according to claim 3,
MBR tank assembly for reducing fouling, characterized in that the bubbler is installed at the bottom of the mesh screen to emit air bubbles. The method according to claim 1,
MBR tank assembly for reducing fouling, characterized in that the floating material measuring sensor for measuring the amount of suspended solids (Suspended Solid) involved in fouling of the separator is installed. The method according to claim 1,
The aerobic tank is provided with an organic concentration measurement sensor for measuring the organic concentration involved in fouling,
MBR tank assembly for reducing fouling, characterized in that the water flows into the housing from the aerobic tank only when the measured organic concentration is less than the reference value. The method according to claim 1,
A support skid is formed on an upper portion of the housing, and the blower, suction pump, or backwash pump is installed on the support skid.
MBR tank assembly for reducing fouling, characterized in that the opening portion, except for the support skid, is opened, and a flexible corrugated opening and closing door is installed at this portion. The method according to claim 1,
A leak sensor is installed at the discharge port of the suction pump to check whether sludge is contained in the treated water discharged from the suction pump and stop the operation of the suction pump if it contains. MBR bath assembly for abatement. The method according to claim 1,
MBR tank assembly for reducing fouling, characterized in that the front of the suction pump to install a differential pressure gauge to measure the pressure across the suction pump, the operation of the suction pump when the measured pressure is more than the reference value. The method according to claim 1,
MBR tank assembly for reducing fouling, characterized in that the exhaust port is formed on the side wall corresponding to the space on the water surface in each housing, each exhaust port is connected to a common exhaust pipe, the exhaust fan is installed at the end of the exhaust pipe . The method according to claim 1,
A fixed vibrator having one end fixed vertically or horizontally is installed between the membranes of the membrane unit of the membrane bioreactor to vibrate by the cleaning air supplied by the blower to remove fouling deposited on the membrane surface. MBR tank assembly for reducing fouling. The method of claim 11,
The fixed vibrationator is a spring-shaped vibrator, a vibrator connecting a plurality of balls, a strip-shaped vibrator having a wave shape, or a strip-shaped vibrator bent S-shaped MBR tank assembly for reducing fouling. The method according to claim 1,
The housing is an MBR tank assembly for fouling reduction, characterized in that the constant temperature unit is installed to maintain a constant internal temperature.

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