Modular ultrafiltration device

Abstract

The utility model discloses a modularized ultrafiltration device which comprises a main machine module, more than two membrane frame modules and an online medicine washing module, wherein the main machine module, the membrane frame modules and the online medicine washing module are modularized and are respectively packaged in a main machine module box body, more than two membrane frame module box bodies and an online medicine washing module box body; the main machine module box body, all the membrane frame module box bodies and the online medicine washing module box bodies are sequentially arranged along a straight line, and a backwashing communicating pipe, a water inlet communicating pipe, a water outlet communicating pipe and a water drainage communicating pipe which are arranged along a unified pipe position are arranged on the side surfaces of the main machine module box body; the internal corresponding host module, each corresponding membrane frame module and the corresponding online medicine washing module are connected with a corresponding backwashing communicating pipe, a corresponding water inlet communicating pipe, a corresponding water outlet communicating pipe or a corresponding water drainage communicating pipe for communicating operation; the water filtering method comprises an inlet water filtering and backwashing alternate circulation mode and a regular online medicine washing mode. According to the utility model, the running reliability and flexibility of the ultrafiltration system are improved, and the water supply stability of the ultrafiltration device is fully ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, especially modularization ultrafiltration device. BACKGROUND

[0002] In the current water supply, reclaimed water, sewage and other advanced treatment, the ultrafiltration device has the characteristics of good treatment effect and stable effluent water quality, and is a commonly used treatment equipment.

[0003] The ultrafiltration device generally has a filtration inlet water, a backwash inlet water system, an ultrafiltration membrane and a membrane rack, a filtration pipeline system, an online chemical washing system, an electric control and a PLC control box, and due to the large number of systems, these systems are often combined together according to the required treatment scale to form a complete set of ultrafiltration device.

[0004] Therefore, the ultrafiltration device in the prior art is customized according to the required treatment capacity.

[0005] Firstly, the treatment capacity cannot be expanded, and when the user needs to increase the treatment capacity, the ultrafiltration device needs to be added, resulting in high cost, large floor area and high treatment cost.

[0006] Secondly, the ultrafiltration device has many components and systems, and once a component or system fails, the entire ultrafiltration device needs to be stopped until it is repaired.

[0007] Therefore, how to improve the reliability and flexibility of the ultrafiltration system operation, meet the different treatment capacity requirements of the user, and fully ensure the stability of the ultrafiltration device water supply has become a technical problem to be solved by the technical personnel in the field. INVENTION CONTENTS

[0008] In view of the above defects of the prior art, the utility model provides a modular ultrafiltration device and a water filtration method, which realizes the reasonable combination of each module, improves the reliability and flexibility of the ultrafiltration system operation, meets the different treatment capacity requirements of the user, and can be replaced at any time through various modules, and fully ensures the stability of the ultrafiltration device water supply.

[0009] To achieve the above purpose, the utility model discloses a modular ultrafiltration device, which comprises a host module, two or more membrane rack modules and an online chemical washing module which are modularized and respectively packaged in a host module box body, two or more membrane rack module box bodies and an online chemical washing module box body.

[0010] The host module box, all the membrane frame module boxes and the online washing module box are arranged in sequence along a straight line, and are provided with backwashing communication pipes, water inlet communication pipes, water outlet communication pipes and drainage communication pipes arranged along unified pipe positions on the side surfaces, and the corresponding host module, each membrane frame module and the online washing module are connected with the corresponding backwashing communication pipes, water inlet communication pipes, water outlet communication pipes or drainage communication pipes for communication operation;

[0011] The host module comprises a water inlet variable frequency pump and a backwashing pump controlled by the host control;

[0012] The water inlet variable frequency pump is connected with the water inlet communication pipe through a pipeline extending out of the host module box;

[0013] The backwashing pump is connected with the backwashing communication pipe through a pipeline extending out of the host module box;

[0014] Each membrane frame module comprises a membrane element;

[0015] Each membrane element is provided with a membrane wire outer communication pipe and a membrane wire inner communication pipe at both ends;

[0016] The other end of each membrane wire outer communication pipe is connected with the water inlet communication pipe and the drainage communication pipe through two pipelines provided with electric butterfly valves respectively;

[0017] The other end of each membrane wire inner communication pipe is connected with the backwashing communication pipe and the water outlet communication pipe through two pipelines provided with electric butterfly valves respectively;

[0018] All the electric butterfly valves are controlled by the host control;

[0019] The online washing module comprises a washing pump, two or more dosing pumps, dosing barrels matched with the dosing pumps in number, and a washing control box;

[0020] All the dosing pumps are arranged corresponding to the dosing barrels respectively;

[0021] The inlet of the washing pump is connected with the water outlet communication pipe through a pipeline extending out of the online washing module box, and the outlet is connected with the backwashing communication pipe through a washing pump water outlet pipe;

[0022] The washing pump water outlet pipe is provided with a pipeline mixer, and a dosing pipe provided in the pipeline mixer is connected with the outlets of all the dosing pumps;

[0023] The washing control box controls the dosing pumps and the washing pump to operate in linkage.

[0024] Preferably, a security filter is arranged on the pipeline through which the water inlet variable frequency pump is connected to the water inlet communication pipe and the pipeline through which the backwashing pump is connected to the backwashing communication pipe.

[0025] The water inlet variable frequency pump is connected to the water inlet bucket through a water inlet pump water inlet pipe extending out of the main module box, and the backwashing pump is connected to the water outlet bucket through a backwashing pump water inlet pipe extending out of the main module box.

[0026] Preferably, the main module box, each membrane rack module box and the online washing module box are respectively provided with a filtered water inlet pipe interface, a backwashing water inlet pipe interface, a filtered water outlet interface and a backwashing drainage pipe interface at positions corresponding to the water inlet communication pipe, the backwashing communication pipe, the water outlet communication pipe and the drainage communication pipe, and are connected to the water inlet communication pipe, the backwashing communication pipe, the water outlet communication pipe and the drainage communication pipe.

[0027] Preferably, the main module is packaged in a main control box and includes a PLC, and the opening and operation of the water inlet variable frequency pump, the backwashing pump, the washing pump and all electric butterfly valves of all the membrane rack modules are controlled by a preset program in the PLC.

[0028] Each electrical equipment and online instrument is connected to the main control box of the packaged main module.

[0029] Preferably, the pipeline extending out of the main module box, each upper membrane rack module box and the online washing module box and connected to the backwashing communication pipe, the water inlet communication pipe, the water outlet communication pipe or the drainage communication pipe is connected to the backwashing communication pipe, the water inlet communication pipe, the water outlet communication pipe or the drainage communication pipe through a union joint.

[0030] Preferably, the main module has several grades according to the processing scale range, and the flow of the water inlet variable frequency pump and the corresponding security filter matches each grade.

[0031] Preferably, each membrane rack module includes two or more membrane elements, all the membrane elements are connected in parallel, each membrane rack module is provided with a corresponding filtering and backwashing pipeline system, and each filtering and backwashing pipeline system can independently perform filtering and backwashing operation.

[0032] Preferably, the online washing module includes a washing pump, three dosing pumps for respectively dosing acidic agent, alkaline agent and sodium hypochlorite agent into the pipeline mixer and a number of corresponding medicine barrels.

[0033] The beneficial effects of the utility model are as follows:

[0034] The utility model discloses through selecting appropriate scale grade and the host module and on -line medicine wash module of the module, through the adjustment membrane frame module quantity, just can increase the processing scale at any time, and the user expands the scale at any time, and great reduce the engineering cost and time of expanding scale simultaneously.

[0035] The utility model discloses can effectively guarantee the stability of ultrafiltration device operation, realizes offline overhaul through module replacement, avoids the entire ultrafiltration device unable to operate due to the failure of some equipment, improves the guarantee rate of water supply.

[0036] The utility model discloses simple structure, convenient operation and maintenance realize the reasonable combination of each module, convenient productization production, effectively reduce the equipment cost.

[0037] The utility model discloses the conception, specific structure and the technical effect of producing of further explanation will be combined with the attached drawing, to fully understand the purpose, characteristics and effect of the utility model. DRAWINGS

[0038] Figure 1 The utility model discloses an embodiment structure schematic diagram.

[0039] In the drawing, 1, water inlet bucket, 2, water outlet bucket, 3, host module box, 4, membrane frame module box, 5, on -line medicine wash module box, 6, water inlet frequency conversion pump, 7, backwash pump, 8, security filter, 9, membrane element, 10, medicine wash pump, 11, pipeline mixer, 12, dosing pump, 13, medicine bucket, 14, backwash communication pipe, 15, water inlet communication pipe, 16, water outlet communication pipe, 17, drainage communication pipe, 18, electric butterfly valve, 19, host control box, 20, medicine wash control box, 21, dosing pipe, 22, water inlet pump inlet pipe, 23, backwash pump inlet pipe, 24, water inlet pump outlet pipe, 25, backwash pump outlet pipe, 26, membrane silk outer liaison pipe, 27, membrane silk inner liaison pipe, 28, medicine wash pump outlet pipe. CONCRETE IMPLEMENTATION

[0040] Embodiment

[0041] As Figure 1 The utility model discloses modularization ultrafiltration device, including modularization and respectively encapsulating in host module, two or more membrane frame modules and on -line medicine wash module in host module box 3, two or more membrane frame module box 4 and on -line medicine wash module box 5 of module,

[0042] The host module box 3, all membrane rack module boxes 4 and online washing module box 5 are arranged in sequence along a straight line, and are provided with backwashing communication pipe 14, water inlet communication pipe 15, water outlet communication pipe 16 and drainage communication pipe 17 arranged along the unified pipe position on the side surface, and the corresponding host module, each membrane rack module and online washing module are connected with the corresponding backwashing communication pipe 14, water inlet communication pipe 15, water outlet communication pipe 16 or drainage communication pipe 17 for communication operation;

[0043] The host module comprises water inlet variable frequency pump 6 and backwashing pump 7 controlled by the host;

[0044] The water inlet variable frequency pump 6 is connected with the water inlet communication pipe 15 through the pipeline extending out of the host module box 3;

[0045] The backwashing pump 7 is connected with the backwashing communication pipe 14 through the pipeline extending out of the host module box 3;

[0046] Each membrane rack module comprises membrane element 9;

[0047] Both ends of each membrane element 9 are provided with membrane wire outer communication pipe 26 and membrane wire inner communication pipe 27;

[0048] The other end of each membrane wire outer communication pipe 26 is connected with the water inlet communication pipe 15 and drainage communication pipe 17 through two pipelines respectively provided with electric butterfly valve 18;

[0049] The other end of each membrane wire inner communication pipe 27 is connected with the backwashing communication pipe 14 and water outlet communication pipe 16 through two pipelines respectively provided with electric butterfly valve 18;

[0050] All electric butterfly valves 18 are controlled by the host;

[0051] The online washing module comprises washing pump 10, two or more dosing pumps 12, medicine barrels 13 matched with the dosing pumps 12 in number and washing control box 20;

[0052] All dosing pumps 12 are arranged corresponding to the respective medicine barrels 13;

[0053] The inlet of the washing pump 10 is connected with the water outlet communication pipe 16 through the pipeline extending out of the online washing module box 5, and the outlet is connected with the backwashing communication pipe 14 through washing pump water outlet pipe 28;

[0054] The washing pump water outlet pipe 28 is provided with pipeline mixer 11, and the dosing pipe 21 arranged in the pipeline mixer 11 is connected with the outlets of all dosing pumps 12;

[0055] The washing control box 20 controls the linkage operation of all dosing pumps 12 and washing pump 10.

[0056] The host module, the two or more membrane frame modules and the on-line washing module which are respectively encapsulated in the host module box 3, the two or more membrane frame module box 4 and the on-line washing module box 5 are connected through various pipes with the same pipe diameter at the specified pipe positions, wherein the pipe positions of the backwashing communication pipe 14 and the water inlet communication pipe 15 are at the upper part of the module, the pipe positions of the water outlet communication pipe 16 and the drainage communication pipe 17 are at the lower part of the module, and the hydraulic flow process of the whole ultrafiltration device is ensured to be combined together.

[0057] According to the water inlet flow change of the host module, the number of the membrane frame modules can be adjusted at any time, so that different processing requirements of the user are met.

[0058] The number of the membrane elements 9 of the membrane frame module can be determined according to needs and operated in parallel, and each membrane frame module is provided with a corresponding filtration and backwashing pipe system and can independently perform filtration and backwashing operation.

[0059] In some embodiments, the host module box 3 is provided with a security filter 8 on the pipe connecting the water inlet communication pipe 15 and the water inlet variable frequency pump 6 and the pipe connecting the backwashing communication pipe 14 and the backwashing pump 7.

[0060] The water inlet variable frequency pump 6 is connected with the water inlet barrel 1 through the water inlet pump water inlet pipe 22 extending out of the host module box 3, and the backwashing pump 7 is connected with the water outlet barrel 2 through the backwashing pump water inlet pipe 23 extending out of the host module box 3.

[0061] In some embodiments, the host module box 3, each membrane frame module box 4 and the on-line washing module box 5 are respectively provided with a filtration water inlet pipe interface, a backwashing water inlet pipe interface, a filtration water outlet interface and a backwashing drainage pipe interface at positions corresponding to the water inlet communication pipe 15, the backwashing communication pipe 14, the water outlet communication pipe 16 and the drainage communication pipe 17, and are connected with the corresponding water inlet communication pipe 15, backwashing communication pipe 14, water outlet communication pipe 16 and drainage communication pipe 17.

[0062] In some embodiments, the host is encapsulated in the host control box 19, including a PLC, and the opening and operation of the water inlet variable frequency pump 6, the backwashing pump 7, the washing pump 10 and all electric butterfly valves of all membrane frame modules are controlled through a preset program in the PLC.

[0063] All electric equipment and on-line instruments are connected to the host control box 19 of the encapsulated host.

[0064] In some embodiments, the pipes connecting the main module box 3, each upper membrane rack module box 4 and the online chemical washing module box 5 with the corresponding backwashing communication pipe 14, water inlet communication pipe 15, water outlet communication pipe 16 or drainage communication pipe 17 are connected through union joints.

[0065] In some embodiments, the main module has several grades according to the processing scale range, and the flow of the water inlet variable frequency pump 6 and the corresponding security filter 8 matches each grade.

[0066] In some embodiments, each membrane rack module includes two or more membrane elements 9; all the membrane elements 9 are connected in parallel; and each membrane rack module is provided with a corresponding filtration and backwashing pipe system; and each filtration and backwashing pipe system can independently perform filtration and backwashing operation.

[0067] In some embodiments, the online chemical washing module includes a chemical washing pump 10 including three dosing pumps 12 and a number of matched chemical barrels 13 respectively dosing acidic agent, alkaline agent and sodium hypochlorite agent into the pipe mixer 11.

[0068] The utility model discloses further discloses a water filtering method of the modular ultrafiltration device, including water inlet filtration and backwashing alternate circulation mode.

[0069] Water inlet filtration and backwashing alternate circulation mode are realized by the main control water inlet variable frequency pump 6, backwashing pump 7 and all electric butterfly valves 18, and the specific implementation is as follows:

[0070] When water inlet filtration is performed, all the electric butterfly valves 18 between the membrane filament inner communication pipes 27 and the water inlet communication pipe 15 are opened, and all the electric butterfly valves 18 between the membrane filament outer communication pipes 26 and the water outlet communication pipe 16 are opened,

[0071] and all the electric butterfly valves 18 between the membrane filament inner communication pipes 27 and the drainage communication pipe 17 are closed, and all the electric butterfly valves 18 between the membrane filament outer communication pipes 26 and the backwashing communication pipe 14 are closed.

[0072] The water inlet variable frequency pump 6 is opened, and the water in the water inlet barrel 1 is filtered through the security filter 8 and the water inlet communication pipe 15 to each membrane element 9;

[0073] The water outlet after being filtered by any membrane element 9 is output to the water outlet barrel 2 through the water outlet communication pipe 16;

[0074] When backwashing is performed, the backwashing of all the membrane elements 9 is sequentially performed according to the corresponding membrane rack module, and the specific implementation is as follows: the backwashing adopts each membrane rack module rotation cleaning mode, and therefore the backwashing pump 7 and the security filter 8 thereof are universal.

[0075] close the electric butterfly valve 18 between the corresponding membrane filament inner communication pipe 27 and the water inlet communication pipe 15, and the electric butterfly valve 18 between the corresponding membrane filament outer communication pipe 26 and the water outlet communication pipe 16,

[0076] and open the electric butterfly valve 18 between the corresponding membrane filament inner communication pipe 27 and the drainage communication pipe 17, and the electric butterfly valve 18 between the corresponding membrane filament outer communication pipe 26 and the backwashing communication pipe 14;

[0077] The backwashing pump 7 is opened, and the water in the water outlet bucket 2 is flushed to each membrane element 9 through the backwashing communication pipe 14 via the security filter 8;

[0078] The water after flushing any membrane element 9 is drained to the sewer through the drainage communication pipe 17;

[0079] After all the membrane elements 9 are backwashed, the electric butterfly valve 18 between all the membrane filament inner communication pipes 27 and the water inlet communication pipe 15, and the electric butterfly valve 18 between all the membrane filament outer communication pipes 26 and the water outlet communication pipe 16 are opened,

[0080] and the electric butterfly valve 18 between all the membrane filament inner communication pipes 27 and the drainage communication pipe 17, and the electric butterfly valve 18 between all the membrane filament outer communication pipes 16 and the backwashing communication pipe 14 are closed,

[0081] and the water inlet variable frequency pump 6 is opened again.

[0082] In some embodiments, a regular online chemical washing mode is further included;

[0083] The regular online chemical washing mode is realized by the host controlling the water inlet variable frequency pump 6, the backwashing pump 7 and all the electric butterfly valves 18, and by the chemical washing control box 20 controlling the chemical washing pump 10 and all the dosing pumps 12, including acid soaking in advance and alkali soaking afterwards;

[0084] During acid soaking, the water inlet variable frequency pump 6 and the backwashing pump 7 are closed,

[0085] all the electric butterfly valves 18 between all the membrane filament inner communication pipes 27 and the water inlet communication pipe 15, and all the electric butterfly valves 18 between all the membrane filament outer communication pipes 26 and the water outlet communication pipe 16 are closed,

[0086] all the electric butterfly valves 18 between all the membrane filament inner communication pipes 27 and the drainage communication pipe 17, and all the electric butterfly valves 18 between all the membrane filament outer communication pipes 26 and the backwashing communication pipe 14 are opened;

[0087] The chemical washing pump 10 and the dosing pump 12 for adding acidic medicament are opened at the same time, and the mixture of the water in the water outlet bucket 2 and the acidic medicament is flushed to all the membrane elements 9 through the backwashing communication pipe 14, and the flushing time is generally not less than 20 seconds,

[0088] Then, the pickling pump 10 and the dosing pump 12 for adding acidic agent are closed, and all the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the drainage communication pipes 17 are closed to soak all the membrane elements 9,

[0089] After at least 30 minutes, all the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the drainage communication pipes 17 are opened, and the backwashing pump 7 is started to clean and soak all the membrane elements 9 after pickling.

[0090] During the alkali soaking, the water inlet variable frequency pump 6 and the backwashing pump 7 are closed,

[0091] All the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the water inlet communication pipes 15 and all the electric butterfly valves 18 between the outer membrane filament communication pipes 26 and the water outlet communication pipes 16 are closed,

[0092] All the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the drainage communication pipes 17 and all the electric butterfly valves 18 between the outer membrane filament communication pipes 26 and the backwashing communication pipes 14 are opened.

[0093] The pickling pump 10, the dosing pump 12 for adding alkaline agent and the dosing pump 12 for adding sodium hypochlorite are started simultaneously to flush the mixed solution of water, alkaline agent and sodium hypochlorite in the water outlet bucket 2 to all the membrane elements 9 through the backwashing communication pipes 14, and the flushing time is generally not less than 20 seconds.

[0094] Then, the pickling pump 10 and the dosing pump 12 for adding acidic agent are closed, and all the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the drainage communication pipes 17 are closed to soak all the membrane elements 9,

[0095] After at least 30 minutes, all the electric butterfly valves 18 between the inner membrane filament communication pipes 27 and the drainage communication pipes 17 are opened, and the backwashing pump 7 is started to clean and soak all the membrane elements 9 after pickling.

[0096] The preferred embodiments of the present application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the existing technology according to the concept of the present application should be within the protection scope defined by the claims.

Claims

1. Modular ultrafiltration device; characterized in that, The main machine module, two or more membrane frame modules and online washing modules are respectively encapsulated in the main machine module box (3), two or more membrane frame module boxes (4) and the online washing module box (5); The main machine module box (3), all the membrane frame module boxes (4) and the online washing module box (5) are arranged in sequence along a straight line, and are provided with backwashing communication pipes (14), water inlet communication pipes (15), water outlet communication pipes (16) and drainage communication pipes (17) arranged along unified pipe positions on the side surfaces; the main machine module, each membrane frame module and the online washing module are connected with the backwashing communication pipes (14), the water inlet communication pipes (15), the water outlet communication pipes (16) or the drainage communication pipes (17) for communication operation; The main machine module comprises a water inlet variable frequency pump (6) and a backwashing pump (7) controlled by the main machine; The water inlet variable frequency pump (6) is connected with the water inlet communication pipe (15) through a pipe extending out of the main machine module box (3); The backwashing pump (7) is connected with the backwashing communication pipe (14) through a pipe extending out of the main machine module box (3); Each membrane frame module comprises a membrane element (9); Each membrane element (9) is provided with a membrane wire outer communication pipe (26) and a membrane wire inner communication pipe (27) at two ends thereof; The other end of each membrane wire outer communication pipe (26) is connected with the water inlet communication pipe (15) and the drainage communication pipe (17) through two pipes provided with electric butterfly valves (18) respectively; The other end of each membrane wire inner communication pipe (27) is connected with the backwashing communication pipe (14) and the water outlet communication pipe (16) through two pipes provided with the electric butterfly valves (18) respectively; All the electric butterfly valves (18) are controlled by the main machine; The online washing module comprises a washing pump (10), two or more dosing pumps (12), dosing barrels (13) matched with the dosing pumps (12) in number, and a washing control box (20); All the dosing pumps (12) are arranged corresponding to the dosing barrels (13) respectively; The inlet of the washing pump (10) is connected with the water outlet communication pipe (16) through a pipe extending out of the online washing module box (5), and the outlet is connected with the backwashing communication pipe (14) through a washing pump water outlet pipe (28); The washing pump water outlet pipe (28) is provided with a pipe mixer (11), and the dosing pipes (21) arranged in the pipe mixer (11) are connected with the outlets of all the dosing pumps (12); The washing control box (20) controls the dosing pumps (12) and the washing pump (10) to operate in linkage.

2. The modular ultrafiltration device of claim 1, wherein, In the main machine module box (3), the pipes connecting the water inlet communication pipe (15) with the water inlet variable frequency pump (6) and the pipes connecting the backwashing communication pipe (14) with the backwashing pump (7) are provided with security filters (8). The water inlet variable frequency pump (6) is connected with the water inlet bucket (1) through the water inlet pump water inlet pipe (22) extending out of the main machine module box (3); the backwashing pump (7) is connected with the water outlet bucket (2) through the backwashing pump water inlet pipe (23) extending out of the main machine module box (3).

3. The modular ultrafiltration device of claim 1, wherein, The main machine module box (3), each membrane rack module box (4) and the online washing module box (5) are respectively provided with a filtered water inlet pipe interface, a backwashing water inlet pipe interface, a filtered water outlet interface and a backwashing drainage pipe interface at positions corresponding to the water inlet communication pipe (15), the backwashing communication pipe (14), the water outlet communication pipe (16) and the drainage communication pipe (17), and are connected with the water inlet communication pipe (15), the backwashing communication pipe (14), the water outlet communication pipe (16) and the drainage communication pipe (17).

4. The modular ultrafiltration device of claim 1, wherein, The main machine is packaged in the main machine control box (19) and includes a PLC, and the opening and operation of the water inlet variable frequency pump (6), the backwashing pump (7), the washing pump (10) and all electric butterfly valves of all the membrane rack modules are controlled by a preset program in the PLC.

5. The modular ultrafiltration device of claim 1, wherein, The pipes extending out of the main machine module box (3), each upper membrane rack module box (4) and the online washing module box (5) and connected with the corresponding backwashing communication pipe (14), water inlet communication pipe (15), water outlet communication pipe (16) or drainage communication pipe (17) are connected through a union joint between the corresponding backwashing communication pipe (14), water inlet communication pipe (15), water outlet communication pipe (16) or drainage communication pipe (17).

6. The modular ultrafiltration device of claim 1, wherein, The main machine module has several grades according to the processing scale range, and the flow of the water inlet variable frequency pump (6) and the corresponding security filter (8) matches each grade.

7. The modular ultrafiltration device of claim 1, wherein, Each membrane rack module includes two or more membrane elements (9); all the membrane elements (9) are connected in parallel; and each membrane rack module is provided with a corresponding filtering and backwashing pipe system; and each filtering and backwashing pipe system can independently perform filtering and backwashing operation.

8. The modular ultrafiltration device of claim 1, wherein, The online washing module includes a washing pump (10), three dosing pumps (12) for respectively dosing acidic agent, alkaline agent and sodium hypochlorite agent into the pipe mixer (11), and a number of corresponding medicine buckets (13).

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