A sewage treatment apparatus having a flat sheet membrane module

Abstract

The application discloses a sewage treatment device with a flat membrane assembly, which comprises an upper membrane support and a lower membrane support, a plate-shaped membrane assembly is installed between the upper membrane support and the lower membrane support, a drain pipe is connected to one side of the upper end of the upper membrane support, a backwashing pipe is connected to the other side of the upper end of the upper membrane support, an aeration pipe is arranged at the lower end of the plate-shaped membrane assembly, and a treated water storage tank is connected to the drain pipe, characterized in that: a first pressure detection unit is arranged at the water inlet end of the plate-shaped membrane assembly, a second pressure detection unit is arranged at the water outlet end of the plate-shaped membrane assembly, and a water turbidity monitoring device is arranged on the drain pipe. The application improves the washing efficiency of the membrane assembly and timely judges whether the membrane assembly is broken or blocked.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, and in particular to a sewage treatment device with a flat membrane module. BACKGROUND

[0002] Membrane bioreactor (MBR) technology is a technology that combines biological treatment technology and membrane separation technology. According to the structure of the membrane, it can be divided into flat membranes, tubular membranes and hollow fiber membranes. Flat membranes are widely used due to their high mechanical strength, strong anti-pollution ability and resistance to breakage. The flat membrane module is arranged in the sewage tank through a frame structure. After long-term use, problems such as membrane pollution and membrane rupture inevitably occur. The treatment method for membrane pollution often requires isolating the membrane module from the membrane tank and then cleaning the surface of the membrane module. This is a typical offline cleaning method. Although the offline cleaning method has strong cleaning specificity, it has the problems of low efficiency and long time consumption. In order to solve the above problems, the online cleaning method emerges as the times require. It does not need to isolate and disassemble the membrane module, which reduces the workload to a certain extent. However, the existing online cleaning method lacks cleaning specificity. At the same time, once the membrane ruptures, there is a lack of monitoring and emergency measures, which leads to the discharge of the treated sewage that does not meet the standards due to inaccurate judgment, causing environmental pollution. SUMMARY

[0003] To achieve the above purpose, the present application provides the following technical scheme:

[0004] A sewage treatment device with a flat membrane module is provided, which comprises an upper membrane support and a lower membrane support, a plate-shaped membrane module is installed between the upper membrane support and the lower membrane support, a drain pipe is connected to one side of the upper end of the upper membrane support, a backwashing pipe is connected to the other side of the upper end of the upper membrane support, an aeration pipe is arranged at the lower end of the plate-shaped membrane module, a treated water storage tank is connected to the drain pipe, a first pressure detection unit is arranged at the water inlet end of the plate-shaped membrane module, and a second pressure detection unit is arranged at the water outlet end of the plate-shaped membrane module; a turbidity monitoring device is arranged on the drain pipe; the device further comprises a first control module and a second control module, the first control module is connected to the first pressure detection unit and the second pressure detection unit, and the second control module is connected to the turbidity monitoring device.

[0005] Further, the first control module determines whether the plate-shaped membrane module is blocked according to the detection information of the first pressure detection unit and the second pressure detection unit, and makes a decision on whether to clean the plate-shaped membrane module, and the second control module determines whether the filtered water meets the predetermined value according to the turbidity monitoring device.

[0006] Further, the cleaning unit comprises a backwashing pipe connected with the treated water storage tank, a water pump connected with the backwashing pipe, and a gas supply pipe connected with the backwashing pipe and connected with an ozone gas supply source.

[0007] Further, the cleaning unit comprises a circular hole plate, a large circular hole arranged at the center of the circular hole plate, a circle of backflow holes arranged at the circumferential side of the large circular hole, and a circle of discharge holes arranged at the circumferential side of the backflow holes.

[0008] Further, the turbidity monitoring device comprises a pipe joint, a first end and a second end of the pipe joint connected with the water pipe, a third end of the pipe joint connected with the light emitting device, a fourth end of the pipe joint connected with the photoelectric element mounting device, a first light transmission hole arranged at the center position of the third end and the fourth end of the pipe joint, two second light transmission holes arranged at the same angle and inclined along the up-down direction of the first light transmission hole at the fourth end, and a cylinder arranged in the photoelectric element mounting device.

[0009] Further, the second control module is connected with the first photoelectric sensor and the second photoelectric sensor, the turbidity of the discharged water is determined to meet the preset requirement when the second control module only receives the information of the first photoelectric sensor and does not receive the information of the second photoelectric sensor, and the turbidity of the discharged water is determined to be abnormal when the second control module receives the information of the first photoelectric sensor and the second photoelectric sensor at the same time.

[0010] Further, the first pressure detection unit and the second pressure detection unit are pressure sensors.

[0011] Further, the second control module judges when the turbidity of the discharged water is abnormal, and an alarm is given to prompt replacement of the plate-shaped membrane assembly.

[0012] Further, when the plate-shaped membrane assembly needs to be cleaned, the first control module closes the aeration pipe and opens the cleaning unit.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] By setting the first control module and the second control module on the sewage treatment device, and by cooperation between the first control module and the second control module and the first pressure detection unit and the second pressure detection unit and the turbidity monitoring device, it can be accurately and timely judged whether the plate-shaped membrane assembly is subject to membrane pollution or membrane rupture, so that corresponding subsequent decisions can be made in time. By cooperation between the round-hole plate, the conical vortex chamber and the horn-shaped pipe of the cleaning unit, ozone gas can be fully dissolved in the treated water, so that the membrane assembly can be sprayed and washed, thereby improving the spraying effect. In addition, when the turbidity of water is high, light irradiated thereon will be scattered, and by cooperation between the light and the sensor, the change in the turbidity of the treated water can be judged, so that whether the membrane assembly is complete can be determined. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a device structure schematic diagram of the present application;

[0016] Figure 2 is a cleaning unit structure schematic diagram of the present application;

[0017] Figure 3 is a round-hole plate structure schematic diagram of the present application;

[0018] Figure 4 is a turbidity monitoring device structure schematic diagram of the present application.

[0019] In the figure, 1 is a plate-shaped membrane assembly; 2 is a drain pipe; 3 is a backwashing pipe; 4 is an aeration pipe; 5 is a treated water storage tank; 6 is a turbidity monitoring device; 7 is a main gas pipe; 8 is a branch pipe; 9 is a gas supply pipe; 10 is a round-hole plate; 11 is a large round hole; 12 is a backflow hole; 13 is a discharge hole; 14 is a conical vortex chamber; 15 is a discharge pipe; 16 is a horn-shaped pipe; 17 is a discharge outlet; 18 is a light emitting device; 19 is a first photoelectric sensor; and 20 is a second photoelectric sensor. EMBODIMENT

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed to be used in the specific embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0021] Referring to the drawings Figures 1-4 As shown in the drawings, in the embodiment of the present application, a sewage treatment device with a flat membrane assembly is provided, which comprises an upper membrane support and a lower membrane support, a plate-shaped membrane assembly 1 is installed between the upper membrane support and the lower membrane support, a drain pipe 2 is connected to one side of the upper end of the upper membrane support, the drain pipe 2 is used to discharge water filtered and purified by the membrane assembly from the sewage pool, a backwashing pipe 3 is connected to the other side of the upper end of the upper membrane support, an aeration pipe 4 is arranged at the lower end of the plate-shaped membrane assembly 1, the drain pipe 2 is connected with a treated water storage tank 5 to realize collection of the treated water, a first pressure detection unit is arranged at the water inlet end of the plate-shaped membrane assembly 1, a second pressure detection unit is arranged at the water outlet end of the plate-shaped membrane assembly 1; a turbidity monitoring device 6 is arranged on the drain pipe 2; further comprising a first control module and a second control module, the first control module is connected with the first pressure detection unit and the second pressure detection unit; the second control module is connected with the turbidity monitoring device 6; the first control module is used to judge whether the plate-shaped membrane assembly 1 is blocked, and the second control module is used to judge whether the plate-shaped membrane assembly 1 is broken.

[0022] The first control module judges the blocking degree of the plate-shaped membrane assembly according to the pressure information detected by the first pressure detection unit and the second pressure detection unit, the first pressure detection unit and the second pressure detection unit are pressure sensors; whether the plate-shaped membrane assembly 1 is blocked is judged according to the pressure difference, and a decision is made on whether to clean the plate-shaped membrane assembly 1, the second control module judges whether the filtered and treated water reaches a predetermined value according to the turbidity monitoring device 6, so as to judge whether the plate-shaped membrane assembly is damaged.

[0023] The sewage treatment device further comprises a cleaning unit, the cleaning unit comprises a backwashing pipe 3 connected with the treated water storage tank 5, the backwashing pipe 3 is connected with a water pump, water in the treated water storage tank 5 is used as backwashing water, the backwashing pipe 3 is further connected with a total gas pipe 7, the total gas pipe 7 is connected with an ozone gas supply source, and ozone is used for cleaning and disinfecting the plate-shaped membrane assembly 1; a plurality of branch pipes 8 are arranged on one side of the backwashing pipe 3, and two gas supply pipes 9 are oppositely arranged on the side wall of each backwashing pipe 3, the gas supply pipes 9 are connected with the total gas pipe 7 through a gas distribution device, and are used for dissolving ozone into the backwashing pipe 3; meanwhile, a one-way automatic valve is arranged at the end of the gas supply pipe 9 connected with the branch pipe 8, so that when the cleaning unit is closed, backwashing water is prevented from flowing back, and the backwashing water is prevented from flowing back into the gas supply pipe.

[0024] The cleaning unit comprises a round hole plate 10, a large round hole 11 is arranged at the center position of the round hole plate 10, a circle of backflow holes 12 is arranged at the circumferential side of the large round hole 11, and a circle of discharge holes 13 is arranged at the circumferential side of the backflow holes 12; the diameter of the large round hole 11 is greater than the diameter of the discharge hole 13, and the diameter of the discharge hole 13 is greater than the diameter of the backflow hole 12; a conical volute chamber 14 is arranged at the top of one side of the round hole plate, a discharge pipe 15 is inserted into the large round hole 11, and the discharge pipe 15 is located in the conical volute chamber 14; the round hole plate 10 is fixedly connected with the branch pipe 8, the other end of the discharge pipe is connected with a horn-shaped pipe 16, and the round hole plate 10 is located between the conical volute chamber 14 and the horn-shaped pipe 16; ribs are uniformly arranged on the outer side wall surface of the horn-shaped pipe 16; ribs are arranged on the inner wall of the conical volute chamber 14 in the direction of rotation; a spray head is arranged at the discharge end of the horn-shaped pipe 16, and discharge ports 17 are uniformly arranged on the spray head; the discharge ports 17 are oppositely arranged with the plate-shaped membrane assembly 1; through cooperation between the round hole plate 10, the conical volute chamber 14 and the horn-shaped pipe 16 of the cleaning unit, the backflow water with dissolved ozone gas is repeatedly backflowed and impacted, the ozone is fully dissolved in the backflow water, and thus the cleaning and disinfecting effect is effectively improved; when the first control module determines that the plate-shaped membrane assembly needs to be cleaned, the aeration pipe is closed, the cleaning unit is opened, and the cleaning control of the membrane assembly is realized.

[0025] The turbidity monitoring device 6 comprises a pipe joint, the pipe joint is used to connect the turbidity monitoring device 6 and the drain pipe 2, specifically, the first end and the second end of the pipe joint are connected with the drain pipe 2, the third end of the pipe joint is connected with the light emitting device 18, the fourth end of the pipe joint is connected with the photoelectric element mounting device, the first light transmission hole is arranged at the center position of the third end and the fourth end of the pipe joint, two second light transmission holes are arranged on the fourth end along the up-down direction of the first light transmission hole, the photoelectric element mounting device comprises a cylinder, an installation plate is arranged in the cylinder, the first photoelectric sensor 19 is arranged on the installation plate corresponding to the position of the first light transmission hole, the second photoelectric sensor 20 is arranged on the installation plate corresponding to the position of the second light transmission hole, the photoelectric element mounting device is irradiated by the light emitting device 18, and the light is irradiated to the photoelectric element through the light transmission hole.

[0026] The second control module is connected with the first photoelectric sensor 19 and the second photoelectric sensor 20, when the turbidity of the treated water is high, the impurity particles in the water are more, the light irradiated by the light emitting device 18 will be scattered, that is, the first photoelectric sensor and the second photoelectric sensor will all receive the light signal, when the second control module receives the information of the first photoelectric sensor and the second photoelectric sensor at the same time, it is judged that the turbidity of the discharged water is abnormal, it is judged that the membrane assembly is abnormal, that is, the membrane assembly is broken, when the second control module judges that the turbidity of the discharged water is abnormal, an alarm is given to replace the plate-shaped membrane assembly, and the membrane assembly needs to be replaced in time; when the second control module only receives the information of the first photoelectric sensor and does not receive the information of the second photoelectric sensor, it indicates that the turbidity of the discharged water meets the preset requirement.

[0027] The sewage treatment device is used for treating sewage, and the first pressure detection unit and the second pressure detection unit arranged on two sides of the plate-shaped membrane assembly 1 and the discharge water turbidity monitoring device 6 arranged on the drain pipe 2 are simultaneously operated to continuously detect whether the membrane assembly is blocked and whether the membrane assembly is broken, when the pressure detection unit detects that the blocking degree of the membrane assembly exceeds the preset value, the cleaning unit is started, the water in the backwashing pipe 3 enters the plurality of branch pipes 8, the ozone gas source pressurizes the ozone gas into the branch pipes 8 through the total gas pipe 7 and the gas supply pipe 9, the gas and the water enter a circle of discharge holes 13 through the round hole plate 10, then flow back to the conical rotating chamber 14 through a circle of backflow holes 12 arranged on the periphery of the large round hole 11, then enter the horn-shaped pipe 16 through the large round hole 11 arranged at the center position of the round hole plate 10, the water and the gas are repeatedly backflowed and impacted, so that the gas is fully dissolved in the water, and the water and the gas are discharged through the nozzle discharge port 17 arranged at the discharge end of the horn-shaped pipe 16, so that the membrane assembly is sprayed, washed and disinfected; at the same time, when the first photoelectric sensor and the second photoelectric sensor both receive the light signal during the operation of the discharge water turbidity monitoring device 6 arranged on the drain pipe 2, it is indicated that the impurity particles in the treated water are relatively many, the turbidity of the treated water exceeds the preset value, it is judged that the membrane assembly is broken and other abnormal phenomena occur, and the plate-shaped membrane assembly is replaced, so that the membrane assembly is replaced in time, the above monitoring means is timely and accurate.

[0028] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A wastewater treatment device with a flat-plate membrane module, comprising an upper membrane support and a lower membrane support, the flat-plate membrane module being installed between the upper membrane support and the lower membrane support, a drain pipe connected to one side of the upper end of the upper membrane support, a backwashing pipe connected to the other side of the upper end of the upper membrane support, an aeration pipe provided at the lower end of the flat-plate membrane module, and the drain pipe being connected to a treated water storage tank, characterized in that: The inlet end of the plate membrane module is provided with a first pressure detection unit, and the outlet end of the plate membrane module is provided with a second pressure detection unit; the drain pipe is provided with a turbidity monitoring device for the discharged water; it also includes a first control module and a second control module, the first control module being connected to the first pressure detection unit and the second pressure detection unit; the second control module being connected to the turbidity monitoring device. It also includes a cleaning unit, which includes a backwash pipe connected to the treated water storage tank, a water pump connected to the backwash pipe, and an air supply pipe connected to the backwash pipe, which is connected to an ozone gas source; multiple branch pipes are provided on one side of the backwash pipe, and two air supply pipes are arranged opposite each other on the side wall of each backwash pipe, and the air supply pipes are connected to the ozone gas source through an air distribution device; a one-way automatic valve is provided at the end of the air supply pipe that enters the backwash pipe; The cleaning unit also includes a perforated plate with a large circular hole at its center, a ring of return holes around the large circular hole, and a ring of discharge holes around the return holes. The diameter of the large circular hole is larger than the diameter of the discharge holes, and the diameter of the discharge holes is larger than the diameter of the return holes. A conical vortex chamber is located on the top side of one side of the perforated plate. A discharge pipe is inserted into the large circular hole and is located within the conical vortex chamber. The perforated plate is fixedly connected to the discharge pipe, and the other end of the discharge pipe is connected to a trumpet-shaped tube. The perforated plate is located between the conical vortex chamber and the trumpet-shaped tube. Ribs are evenly distributed on the outer wall of the trumpet-shaped tube. The inner wall of the conical vortex chamber is provided with vortex ribs in the vortex direction; the outlet end of the trumpet-shaped tube is provided with a nozzle, and the nozzle is evenly provided with an outlet, which is arranged opposite to the plate-shaped membrane module; the water in the backwash pipe enters into multiple branch pipes, and the ozone gas supply source pressurizes ozone gas into the branch pipes through the main gas pipe and the gas supply pipe. The gas and water enter through a ring of inlet holes in the perforated plate, and then flow back to the conical vortex chamber through a ring of return holes on the periphery of the large perforated hole. Then, they enter the trumpet-shaped tube through the large perforated hole at the center of the perforated plate. After repeated backflow and impact, the water and gas are discharged through the outlet of the nozzle at the outlet end of the trumpet-shaped tube, thereby achieving spray cleaning and disinfection of the membrane module.

2. The wastewater treatment device with a flat-sheet membrane module according to claim 1, characterized in that: The first control module determines whether the plate membrane assembly is clogged based on the detection information from the first pressure detection unit and the second pressure detection unit, and makes a decision on whether to clean the plate membrane assembly. The second control module determines whether the filtered water reaches a predetermined value based on the turbidity monitoring device.

3. The wastewater treatment device with a flat-sheet membrane module according to claim 1, characterized in that: The turbidity monitoring device includes a pipe fitting. The first and second ends of the pipe fitting are connected to the water pipe. The third end of the pipe fitting is connected to a light-emitting device. The fourth end of the pipe fitting is connected to a photoelectric element mounting device. A first light-transmitting hole is provided at the center of the third and fourth ends of the pipe fitting. Two second light-transmitting holes are also provided at equal angles along the vertical direction of the first light-transmitting hole at the fourth end. The photoelectric element mounting device includes a cylinder with a mounting plate inside. A first photoelectric sensor is provided on the mounting plate at the position corresponding to the first light-transmitting hole, and a second photoelectric sensor is provided on the mounting plate at the position corresponding to the second light-transmitting hole.

4. A wastewater treatment device with a flat-sheet membrane module according to claim 3, characterized in that: The second control module is connected to the first photoelectric sensor and the second photoelectric sensor. When the second control module only receives information from the first photoelectric sensor and does not receive information from the second photoelectric sensor, it determines that the turbidity of the discharged water meets the preset requirements. When the second control module receives information from both the first and second photoelectric sensors, it determines that the turbidity of the discharged water is abnormal.

5. A wastewater treatment device with a flat-sheet membrane module according to claim 4, characterized in that: The first pressure detection unit and the second pressure detection unit are pressure sensors.

6. A wastewater treatment device with a flat-sheet membrane module according to claim 5, characterized in that: When the second control module determines that the turbidity of the discharged water is abnormal, it will issue an alarm and prompt the replacement of the plate membrane module. When the first control module determines that the plate membrane assembly needs to be cleaned, it closes the aeration pipe and turns on the cleaning unit.

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