KR102464092B1 - Sewege treatment system using the socket type separation membrane filter - Google Patents

Abstract

The present invention relates to a sewage treatment system using a filter for sewage treatment, and more particularly, to a sewage treatment system using a socket-type separation membrane filter, which is provided with a socket-type separation membrane configured to be able to enter and exit the filter so that quick measures can be taken when the separation membrane is clogged. It relates to a processing system. A sewage treatment system according to the present invention includes: a flow rate control tank equipped with an inflow pump for inflow of sewage; a reaction tank for treating the sewage introduced from the wandering tank; a treatment water tank receiving and temporarily storing treated water from the reaction tank; a filter that receives and filters the treated water from the reaction tank and the treatment water tank, the filter including a hollow housing and a separation membrane module disposed inside the housing and configured to be horizontally moved in and out of the housing; a suction pump installed in a suction pipe connected to an upper header of the separation membrane module to suction and filter the treated water introduced into the housing of the filter through the separation membrane module and then discharge it to a discharge water tank; a blower provided in a blower pipe connected to a lower side diffuser of the separation membrane module to blow air for removing impurities interposed on the surface of the separation membrane module; a discharge water tank for temporarily storing the treated water filtered by the filter and discharging to the outside; It includes a control unit that controls the overall operation.

Description

Sewage treatment system using the socket type separation membrane filter

The present invention relates to a sewage treatment system using a filter for sewage treatment, and more particularly, to a sewage treatment system using a socket-type separation membrane filter, which is provided with a socket-type separation membrane configured to be able to enter and exit the filter so that quick measures can be taken when the separation membrane is clogged. It relates to a processing system.

In general, SBR (SEQUENCING BATCH REACTOR) method is widely used in sewage treatment system. The SBR method is a method for treating and purifying pollutants such as nitrogen and phosphorus by performing aeration, reaction, precipitation and discharge in one reactor. Specifically, in the SBR method, after sewage is introduced into the reactor, organic matter removal nitrification is performed through aeration, denitrification is performed in an anaerobic state in the reaction (stop) stage, and after solid and liquid are separated in the precipitation stage, supernatant water is used with a decanter pump. As wastewater is discharged and excess sludge is removed, sewage purification treatment is performed. However, in the case of this SBR method, since a single reaction tank is used, there is a problem of overflow of the flow tank when the inflow is increased, and there is a risk of water quality deterioration due to forced precipitation due to the increase in flow in the aeration step. In addition, there is a disadvantage that causes deterioration of the discharged water quality due to the increase in the MLSS (average suspended matter concentration) and the occurrence of scum in the reaction tank due to the high risk of SS (float) leakage during discharge. And, after the treatment in the reaction tank is completed, the treated water is discharged after the final filtration process in a separate filter. In the filter, the filter such as a separation membrane is frequently clogged by solids, so that the filter is washed or treated with chemicals, etc. The problem that the sewage treatment process has to be stopped for a long time because it takes a long time frequently occurs.

Meanwhile, as another sewage treatment method, the MBR (Membrane Bio Reactor) method is used. The MBR method connects the inside of the separation membrane with a suction pump in a state in which the membrane is immersed in the reactor and vacuum suctions the suspended substances from the outer surface of the separation membrane. It is a sewage treatment method that separates solid and liquid by filtering this and allowing only treated water to flow out through a suction pump. In case of a problem such as a rise in differential pressure due to clogging of the separation membrane during long-term treatment, this separation membrane method has to lift the immersed separation membrane and take measures such as cleaning or chemical treatment and then immersion and use again. Due to the interruption, there is a high risk of facility flooding and sewage leakage, and water quality deterioration problems frequently occurred due to the occurrence of capitalization due to over-aeration due to continuous aeration time maintenance during leakage.

Republic of Korea Patent Registration 10-1579488 No. 20-0393666 for the Republic of Korea Registration Office

The present invention was devised to solve the problems of the conventional sewage treatment method as described above. It has a compact structure while satisfying the effluent water quality standards of small-scale sewage treatment facilities, and provides rapid recovery in case of frequent clogging of filter media such as separation membranes. An object of the present invention is to provide a filter and a sewage treatment system using the filter that can solve problems such as delay in sewage treatment and increase in backwash volume due to a decrease in filtration time and filtration amount.

According to an aspect of the present invention, there is provided a sewage treatment system comprising: a flow rate control tank equipped with an inflow pump for inflow of sewage; a reaction tank for treating the sewage introduced from the wandering tank; a treatment water tank for receiving and temporarily storing treated water from the reaction tank; a filter that receives and filters the treated water from the reaction tank and the treatment water tank, the filter including a hollow housing and a separation membrane module disposed inside the housing and configured to be horizontally moved in and out of the housing; a suction pump installed in a suction pipe connected to an upper header of the separation membrane module to suction and filter the treated water introduced into the housing of the filter through the separation membrane module and then discharge it to a discharge water tank; a blower provided in a blower pipe connected to a lower side diffuser of the separation membrane module to blow air for removing impurities interposed on the surface of the separation membrane module; a discharge water tank for temporarily storing the treated water filtered by the filter and discharging to the outside; It includes a control unit that controls the overall operation.

One side of the filter is provided with a withdrawal cylinder for moving the separation membrane module in and out of the housing.

In addition, it is preferable that a differential pressure gauge for measuring the differential pressure inside and outside the separation membrane module is provided in the suction pipe.

When the differential pressure sensed by the differential pressure gauge reaches a preset upper limit of differential pressure, the controller expands the withdrawal cylinder while stopping the suction pump to withdraw the separation membrane module.

In order to transfer the treated water in the reaction tank and the treatment water tank to the filter, the reaction tank and the treatment water tank are connected to the filter by a transfer pipe, and the transfer pipe includes a first transfer pump provided inside the reaction tank and the inside of the treatment water tank. The second transfer pumps are connected to each other, and on the discharge side of the first transfer pump of the transfer pipe, a first electric valve for controlling the transfer of the treated water in the reaction tank to the treatment water tank or filter is provided, and the second transfer A second electric valve for controlling the transfer of the treated water in the treated water tank to the filter is provided on the pump discharge side, and a level transmitter is provided inside the filter to sense the level of the treated water in the filter in real time, and the control unit When the level of the treated water inside the filter is lower than the reference water level, the first or second motorized valve is opened to supply the treated water to the filter, and when the reference water level is reached, it is closed to block the treated water supply.

In addition, the filter further comprises a bypass pipe for discharging the treated water inside the filter back into the reaction tank or the treated water, wherein a third electric valve is provided at the intersection of the branch pipe to which the bypass pipe and the treated water tank are connected, , a fourth electric valve is provided at the distal end of the branch pipe connected to the reaction tank, and the control unit opens the third electric valve or the fourth electric valve when the water level of the filter sensed by the level transmitter exceeds the reference water level. The treated water inside the filter is bypassed again to the reaction tank or the treated water tank, so that the level of the treated water inside the filter is maintained constant.

A backwash pipe is branched to the suction pipe, and a backwash tank is connected to an end of the backwash pipe, and the backwash pipe is provided with a backwash pump for pressurizing and supplying backwash water inside the backwash tank, A fifth electric valve is provided at the intersection of the suction side and the suction pipe and the backwash pipe, and the fifth motorized valve is a three-way valve. The treated water transferred through is discharged to the effluent tank, and when the membrane module is backwashed, the backwash pump side is opened so that the backwash water is supplied to the suction pipe and the separation membrane through the backwash pipe.

In addition, when the differential pressure sensed by the differential pressure gauge reaches a predetermined backwash reference value, the control unit stops the suction pump, operates the backwash pump, and switches the fifth electric valve, so that the backwash water in the backwash tank passes through the backwash pipe through the suction pipe and the separation membrane. It is controlled to be supplied to the module.

According to the present invention as described above, it is possible to meet the effluent water quality standards of water-scale sewage treatment facilities by installing a filter including a separation membrane, and the entire operation is automatically controlled by the control unit, making it easy to perform and manage the process, In particular, it can be applied to small-scale sewage treatment facilities with a compact structure, and the separation membrane module can be withdrawn, so cleaning and maintenance of the membrane module is easy. has the advantage of being able to solve

1 is an overall configuration diagram of a sewage treatment system using a socket-type membrane filter according to the present invention;
2 is a block diagram of a socket-type membrane filter according to the present invention.

Hereinafter, the configuration and operation of a sewage treatment system using a socket-type membrane filter according to the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

As shown in FIG. 1 , the sewage treatment system using a socket-type separator filter 600 according to the present invention includes a flow rate control tank 100 , a reaction tank 200 , a treatment tank 300 , a filter 600 , and a discharge tank. 700 , a backwash water tank 900 and a control unit 1000 are included.

The flow rate adjustment tank 100 is a water storage tank for temporarily storing the sewage to be treated and constantly adjusting the amount of sewage flowing into the reaction tank 200 to be described later. An inflow pump 110 for pressurizing and transporting is provided. In addition, the sewage inlet pipe 101 is provided with a drum screen 120 for filtering out stones or other foreign substances contained in the sewage pressurized and transported by the inlet pump 110 .

The reaction tank 200 is a tank for treating the sewage flowing in from the flow control tank 100 and is configured in the form of a housing with an open top. Although not shown to cause various reactions for sewage treatment such as anaerobic reaction, anoxic reaction, or aerobic reaction in the reaction tank 200, various treatment devices such as a stirrer, an aeration pipe, and a sludge transfer pump may be provided, and the treated water is provided with a transfer pipe 500 and a first transfer pump 210 for transferring the to a treatment water tank 300 or a filter 600 to be described later. The configuration of the reaction tank 200 and various processing devices may be changed as necessary.

The treatment water tank 300 is a water tank for temporarily storing treated water treated through various reactions in the reaction tank 200 . When a large amount of treated water is supplied to the filter 600 at one time in the reaction tank 200, the entire amount cannot be treated due to the limitation of the treatment capacity of the filter 600, so only a certain amount is periodically supplied to the filter 600 and the rest is supplied to the treatment water tank Temporarily stored in (300). As shown in FIG. 1 , the treatment water tank 300 is provided with a second transfer pump 310 for supplying the stored treated water to the filter 600 through the transfer pipe 500 .

The filter 600 is a device that receives the treated water from the reaction tank 200 or the treated water tank 300 and filters it. As shown in FIGS. 1 and 2 , the filter 600 includes a hollow housing 610 and a separation membrane for removing impurities in the treated water inside the housing 610 . As shown in FIG. 2 , the housing 610 is generally composed of a hollow rectangular parallelepiped body, and the lower part is composed of a hopper shape tapering upwards and downwards. An inlet 612 and a bypass port 622 are formed at one upper side of the housing 610 . The inlet 612 is a portion into which treated water is introduced from the reaction tank 200 and the treatment water tank 300, and as shown in FIG. 1, a transfer pipe 500 connected to the first transfer pump 210 of the reaction tank 200. This is connected, and the bypass port 622 is a part for discharging the treated water inside the filter 600 back to the reactor 200 or the treated water, and the bypass pipe 800 is connected as shown in FIG. 1 . .

As shown in FIG. 2 , the separation membrane module 620 is provided with a header 622 on the upper portion in the same way as in a conventional separation membrane structure for sewage treatment, and is provided below the header 622 to form a header 622 and A plurality of separation membranes are provided in communication. In addition, a plurality of pores are formed in the separation membrane. Through this structure, as shown in FIG. 1 , the treated water inside the housing 610 is sucked through the pores of the separation membrane according to the operation of the suction pump 640 provided in the suction pipe 642 connected to the header 622 and , impurities that cannot pass through the pores are filtered out by the separation membrane. Accordingly, the treated water from which impurities have been filtered is sucked through the suction pipe 642 , and the sucked treated water is temporarily stored in the discharge water tank 700 and then discharged to the outside.

In addition, an air diffuser 624 is provided below the separation membrane module 620 , and a blower 630 is connected to the air diffuser 624 . In general, when the filtration process through the separation membrane is performed for a long period of time, impurities are interposed on the surface of the separation membrane to close the pores. In the case of such clogging of the separation membrane, since the suction of the treated water is not performed smoothly, it is necessary to remove impurities interposed on the surface of the separation membrane. As the air supplied from the blower 630 through the diffusion pipe 624 rises by lift, impurities intervening on the surface of the separation membrane are washed and removed to alleviate clogging of the separation membrane. In addition, a differential pressure gauge 644 is provided in the suction pipe 642 . The differential pressure gauge 644 measures the differential pressure inside and outside the separator, and when impurities accumulate on the outer surface of the separator and occlusion occurs, the differential pressure rises. When this differential pressure rise is detected, the operation of the suction pump 640 is stopped by automatic control of the controller 1000 and air cleaning of the separation membrane is performed as described below.

On the other hand, the separation membrane module 620 is configured to be in and out of the housing 610 in a socket type (drawer type). In more detail, as shown in FIG. 2 , one side of the housing 610 is opened so that the separation membrane module 620 is configured to be in and out of the housing 610 . On the outside of the separation membrane module 620, when the separation membrane module 620 is accommodated in the housing 610, it covers one side of the separation membrane module 620 and blocks the opening of the housing 610 to prevent the treated water from being discharged to the outside. It is preferable that a shielding plate 626 is provided, and a separate sealing member (not shown) is additionally provided to prevent leakage of treated water between the shielding plate 626 and the side opening of the housing 610 . In addition, a suction pipe connector 628 to which a suction pipe 642 for connecting a header 622 and a suction pump 640 provided on the upper portion of the separation membrane is coupled is formed on the upper portion of the shielding plate 626, and an acid A blower pipe connector 629 to which a blower pipe 632 for connecting the engine 624 and the blower 630 is coupled is provided. Since the separation membrane module 620 is moved in and out while moving in the horizontal direction, the suction pipe 642 and the blower pipe 632 made of a solid metal are not directly connected to the suction pipe connector 628 and the blower pipe connector 629. Separate flexibility The suction pipe connector 628 and the suction pipe 642 and the blower pipe connector 629 and the blower pipe 632 are interconnected by a hose.

Additionally, a withdrawal cylinder 650 for moving the separation membrane module 620 in and out of the housing 610 is provided outside the housing 610 of the filter 600 . As shown in FIG. 2 , the withdrawal cylinder 650 is disposed in a horizontal direction on one side of the housing 610 and the end of the cylinder rod is coupled to one edge of the shield plate 626 so as to expand and contract according to the expansion and contraction. The separation membrane module 620 is drawn out or accommodated in and out of the housing 610 . The withdrawal cylinder 650 is configured to automatically expand or contract according to the control of the controller 1000 under specific conditions. More specifically, the extraction cylinder 650 expands under the control of the control unit 1000 at a preset period of time to draw out the separation membrane, so that the operator can periodically clean or maintain the separation membrane. In addition, when the differential pressure sensed by the differential pressure gauge 644 provided in the suction pipe 642 reaches a preset upper limit of differential pressure, the control unit 1000 operates the withdrawal cylinder 650 while the suction pump 640 is stopped. By expanding the separation membrane module 620, emergency cleaning and maintenance are possible. As such, as the separation membrane module 620 is automatically drawn out in the horizontal direction by the withdrawal cylinder 650, it has an advantage that it can be easily cleaned or maintained without additional lifting equipment.

Meanwhile, as shown in FIG. 1 , a first electric valve 510 is provided on the discharge side of the first transfer pump 210 of the transfer pipe 500 , and the second transfer pump 310 of the transfer pipe 500 is provided. ) A second electric valve 520 is provided on the discharge side. The first electric valve 510 controls the transfer of the treated water treated in the reaction tank 200 to the treated water tank 300 or the filter 600, and the second electric valve 520 is the treated water tank 300. This is to control the transfer of the treated water temporarily stored in the filter 600 . That is, the first electric valve 510 and the second electric valve 520 are provided to supply a certain amount of treated water to the filter 600 as already mentioned above. As shown, a level transmitter 624 is provided inside the filter 600 to detect the level of the treated water inside the filter 600 in real time, and when the level of the treated water inside the filter 600 is lower than the reference water level, the The first electric valve 510 or the second electric valve 520 is opened to receive treated water, and when the reference water level is reached, it is closed to block further treatment of water supply. In addition, a third electric valve 820 is provided at the intersection of the branch pipe connected to the bypass pipe 800 and the treatment water tank 300 , and a third electric valve 820 is provided at the distal end of the branch pipe connected to the reaction tank 200 . Four electric valves 810 are provided. Accordingly, when the water level of the filter 600 sensed by the level transmitter 624 exceeds the reference water level, the third electric valve 820 or the fourth electric valve 810 is opened and the filter 600 inside The treated water may be bypassed again to the reaction tank 200 or the treated water tank 300 to maintain a constant level of the treated water in the filter 600 . In addition, since the operation of the filter 600 is stopped when the separation membrane module 620 is withdrawn for cleaning or inspection of the separation membrane module 620, also at this time, the third electric valve 820 or the fourth electric valve ( 810 is opened, and the treated water inside the filter 600 is discharged to the reaction tank 200 or the treated water tank 300 .

Meanwhile, as shown in FIG. 1 , a backwash pipe 910 is branched to the suction pipe 642 , and a backwash tank 900 is connected to an end of the backwash pipe 910 . In addition, the backwashing pipe 910 is provided with a backwashing pump 920 for pressurizing and supplying backwashing water in the backwashing tank 900 . In addition, a fifth electric valve 930 is provided at the intersection of the suction side of the suction pump 640 and the suction pipe 642 and the backwash pipe 910 . The fifth electric valve 930 is generally composed of a three-way valve, and when the suction pump 640 is operated under the control of the control unit 1000 , the suction pump 640 side is opened and transferred through the suction pipe 642 . The water is discharged to the discharge water tank 700, and when the membrane module 620 is backwashed, the backwash pump 920 side is opened so that the backwash water is supplied to the suction pipe 642 and the separation membrane through the backwash pipe 910. do. The backwashing of the separation membrane module 620 may be performed at predetermined intervals, or may be configured to be automatically performed when the differential pressure sensed by the differential pressure gauge 644 reaches a predetermined backwashing reference value. More specifically, when the differential pressure sensed by the differential pressure gauge 644 reaches a predetermined backwash reference value, the controller 1000 stops the suction pump 640, operates the backwash pump 920, and operates a fifth electric valve ( 930) is switched so that the backwash water in the backwash tank 900 is supplied to the separation membrane module 620 through the suction pipe 642 through the backwash pipe 910. The backwash water supplied to the separation membrane module 620 passes through the pores of the separation membrane and removes impurities blocking the pores, and the mixed water of the removed impurities and backwash water is stored at the lower side of the filter 600 . On the other hand, the lower portion of the filter 600 is connected to the flow control tank 100 and the return pipe 660, the return pipe 660 is provided with a sixth electric valve 662. The mixed water stored in the lower side of the filter 600 is returned to the flow rate adjusting tank 100 through the return pipe 660 while the sixth electric valve 662 is opened under the control of the controller 1000 .

Here, the preset backwash reference value is set to a lower value than the above-mentioned upper differential pressure limit, and accordingly, backwashing is performed at a backwash reference value with a relatively less degree of occlusion of the separator, and the degree of occlusion abruptly increases and suddenly reaches the upper differential pressure limit. When it arrives, it is possible to take out the separation membrane module 620 and take steps to clean or maintain it.

As described above, according to the present invention, the entire operation is automatically controlled by the control unit 1000 to facilitate the execution and management of the process. Easy.

In the above, specific embodiments of the present invention have been described. However, the spirit and scope of the present invention is not limited to these specific embodiments, and various modifications and variations are possible within the scope that does not change the gist of the present invention. Anyone who has it will understand. Therefore, since the embodiments described above are provided to fully inform those of ordinary skill in the art to which the present invention pertains to the scope of the invention, it should be understood that they are exemplary in all respects and not limiting, The invention is only defined by the scope of the claims.

100: flow control tank 101: sewage inlet pipe
110: inflow pump 120: drum screen
200: reaction tank 210: first transfer pump
300: treatment water tank 310: second transfer pump
500: transfer pipe 510: first electric valve
520: second electric valve 600: filter
610: housing 612: inlet
622: bypass sphere 624: level transmitter
620: separator module 622: header
624: diffuser 626: shield plate
628: suction pipe connection 629: blower pipe connection
630: blower 632: blower pipe
640: suction pump 642: suction pipe
644: differential pressure gauge 650: withdrawal cylinder
660: return pipe 662: 6th electric valve
700: discharge tank 800: bypass pipe
810: fourth electric valve 820: third electric valve
900: backwash tank 910: backwash pipe
920: backwash pump 930: fifth electric valve
1000: control unit

Claims (8)

a flow rate adjustment tank 100 having an inflow pump 110 for inflow of sewage;
a reaction tank 200 for treating the sewage introduced from the flow rate control tank;
a treatment water tank 300 for temporarily storing treated water supplied from the reaction tank 200;
The treated water is supplied from the reaction tank 200 and the treatment water tank 300 and filtered, and the hollow housing 610 and the housing 610 are disposed inside the housing 610 and can be moved in and out of the housing 610 in a horizontal direction. a filter 600 including a separation membrane module 620 configured to do so;
The upper header 622 of the separation membrane module 620 to discharge the treated water introduced into the housing 610 of the filter 600 into the discharge water tank 700 after suction and filtering through the separation membrane module 620. a suction pump 640 installed in the suction pipe 642 connected to;
a blower 630 provided in a blower pipe 632 connected to the lower diffuser pipe 624 of the separation membrane module 620 to blow air for removing impurities interposed on the surface of the separation membrane module 620;
a discharge water tank 700 for temporarily storing the treated water filtered by the filter 600 and discharging to the outside;
a control unit 1000 for controlling the overall operation;
A withdrawal cylinder 650 for moving the separation membrane module 620 in and out of the housing 610 is provided on one side of the filter 600;
The suction pipe 642 is provided with a differential pressure gauge 644 for measuring the differential pressure inside and outside the separation membrane module 620;
A backwash water pipe 910 is branched and connected to the suction pipe 642 , a backwash water tank 900 is connected to an end of the backwash water pipe 910 , and the backwash water inside the backwash water tank 900 is connected to the backwash water pipe 910 . A backwash pump 920 for supplying under pressure is provided, and a fifth electric valve 930 is provided at the intersection of the suction side of the suction pump 640 and the suction pipe 642 and the backwash pipe 910 . , the fifth electric valve 930 is composed of a three-way valve, and when the suction pump 640 is operated under the control of the controller 1000, the suction pump 640 side is opened and transferred through the suction pipe 642. The water is discharged to the discharge water tank 700, and when the membrane module 620 is backwashed, the backwash pump 920 side is opened so that the backwash water is supplied to the suction pipe 642 and the separation membrane through the backwash pipe 910. A sewage treatment system using a socket-type membrane filter, characterized in that it is. delete delete The method of claim 1,
When the differential pressure sensed by the differential pressure gauge 644 reaches a preset upper limit of differential pressure, the control unit 1000 expands the withdrawal cylinder 650 while stopping the suction pump 640 to withdraw the separation membrane module 620 . A sewage treatment system using a socket-type membrane filter, characterized in that The method of claim 1,
In order to transfer the treated water in the reaction tank 200 and the treated water tank 300 to the filter 600 , the reaction tank 200 and the treated water tank 300 are connected to the filter 600 by a transfer pipe 500 . A first transfer pump 210 provided in the reaction tank 200 and a second transfer pump 310 provided in the treatment water tank 300 are respectively connected to the transfer pipe 500, and the transfer pipe ( 500) on the discharge side of the first transfer pump 210, a first electric valve 510 for controlling the transfer of the treated water in the reaction tank 200 to the treatment water tank 300 or the filter 600 is provided, and the second A second electric valve 520 for controlling the transfer of the treated water in the treated water tank 300 to the filter 600 is provided on the discharge side of the transfer pump 310, and a level transmitter 624 is provided inside the filter 600. is provided to detect the level of the treated water inside the filter 600 in real time, and the control unit 1000 is configured to control the first electric valve 510 or the first electric valve when the level of the treated water inside the filter 600 is lower than the reference water level. A sewage treatment system using a socket-type membrane filter, characterized in that the second electric valve (520) is opened so that the treated water is supplied to the filter (600), and when the reference water level is reached, it is closed to block the treated water supply. 6. The method of claim 5,
A bypass pipe 800 for discharging the treated water inside the filter 600 back to the reaction tank 200 or the treated water tank 300 is further included, the bypass pipe 800 and the treated water tank 300 A third electric valve 820 is provided at the intersection of the branch pipe to which is connected, and a fourth electric valve 810 is provided at the distal end of the branch pipe connected to the reaction tank 200, and the control unit 1000 is When the water level of the filter 600 sensed by the level transmitter 624 exceeds the reference water level, the third electric valve 820 or the fourth electric valve 810 is opened, and the treated water inside the filter 600 is returned to the reaction tank. (200) or a sewage treatment system using a socket-type membrane filter, characterized in that it is bypassed to the treatment water tank (300) to control the level of the treated water inside the filter (600) to be kept constant. delete The method of claim 1,
When the differential pressure sensed by the differential pressure gauge 644 reaches a predetermined backwash reference value, the control unit 1000 stops the suction pump 640, operates the backwash pump, and switches the fifth electric valve 930 to the backwash tank ( 900) A sewage treatment system using a socket-type membrane filter, characterized in that the backwash water is controlled to be supplied to the membrane module 620 through the suction pipe 642 through the backwash pipe 910.

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