Modular ultrafiltration device and water filtering method

Abstract

The invention discloses a modularized ultrafiltration device and a water filtering method. The modularized ultrafiltration device comprises a main machine module, more than two membrane frame modules and an online medicine washing module which 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. The running reliability and flexibility of the ultrafiltration system are improved, and the water supply stability of the ultrafiltration device is fully guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a modular ultrafiltration device and a water filtering method. Background Art

[0002] In the current deep treatment of water supply, recycled water, sewage, etc., 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 consists of filtered water inlet, backwash water inlet system, ultrafiltration membrane and membrane frame, filtration piping system, online drug washing system, electronic control and PLC control box. Due to the large number of systems, these systems are often combined together according to the required processing scale to form a complete ultrafiltration device.

[0004] Therefore, the ultrafiltration devices in the prior art are all customized according to the required processing volume. However, such customized ultrafiltration devices have several major defects:

[0005] First, the processing capacity cannot be expanded. When the user needs to increase the processing capacity, he can only add an ultrafiltration device, which results in high expenses, large floor space and high processing costs.

[0006] Secondly, the ultrafiltration device has many components and systems. As long as one component or system has a problem, the entire ultrafiltration device will be shut down until it is repaired. When it is difficult to repair, it will seriously affect the stable operation.

[0007] Therefore, how to improve the reliability and flexibility of the ultrafiltration system operation, meet the users' requirements for different processing volumes, and fully ensure the stability of the water supply of the ultrafiltration device has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] In view of the above-mentioned defects of the prior art, the present invention provides a modular ultrafiltration device and a water filtration method, the purpose of which is to achieve a reasonable combination of modules, improve the reliability and flexibility of the ultrafiltration system operation, meet the user's requirements for different processing volumes, and be able to replace various modules at any time to fully ensure the stability of the water supply of the ultrafiltration device.

[0009] To achieve the above-mentioned purpose, the present invention discloses a modular ultrafiltration device, comprising a host module, two or more membrane frame modules and an online drug washing module which are modularly packaged in a host module box, two or more membrane frame module boxes and an online drug washing module box respectively;

[0010] The host module box, all the membrane rack module boxes and the online drug washing module boxes are arranged in a straight line in sequence, and the side is provided with a backwash connecting pipe, a water inlet connecting pipe, a water outlet connecting pipe and a drainage connecting pipe arranged along the same pipe position, and the corresponding host module, each corresponding membrane rack module and the corresponding online drug washing module are connected to the corresponding backwash connecting pipe, the corresponding water inlet connecting pipe, the corresponding water outlet connecting pipe or the corresponding drainage connecting pipe for interconnected operation;

[0011] The host module includes a water inlet frequency conversion pump and a backwash pump which are controlled to start and stop by the host;

[0012] The water inlet frequency conversion pump is connected to the water inlet connecting pipe through a pipe extending out of the main module box;

[0013] The backwash pump is connected to the backwash connecting pipe through a pipe extending out of the main module box;

[0014] Each of the membrane frame modules comprises a membrane element;

[0015] Both ends of each membrane element are provided with a membrane wire outer communication pipe and a membrane wire inner communication pipe;

[0016] The other end of each of the membrane-thread external communication pipes is connected to the water inlet connecting pipe and the drainage connecting pipe respectively through two pipes provided with electric butterfly valves;

[0017] The other end of each of the membrane wire inner communication pipes is respectively connected to the backwash connecting pipe and the water outlet connecting pipe through two pipes provided with the electric butterfly valve;

[0018] All the electric butterfly valves are opened and closed by the host;

[0019] The online drug washing module includes a drug washing pump, two or more drug dosing pumps, drug barrels matching the number of drug dosing pumps, and a drug washing control box;

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

[0021] The inlet of the drug washing pump is connected to the water outlet connecting pipe through a pipe extending out of the box of the online drug washing module, and the outlet is connected to the backwash connecting pipe through the water outlet pipe of the drug washing pump;

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

[0023] The drug washing control box controls all the drug adding pumps to operate in conjunction with the drug washing pump.

[0024] Preferably, in the main module box, a safety filter is provided on the pipe connecting the water inlet variable frequency pump to the water inlet connecting pipe and the pipe connecting the backwash pump to the backwash connecting pipe;

[0025] The water inlet frequency conversion pump is connected to the water inlet bucket through a water inlet pump water inlet pipe extending out of the host module box; the backwash pump is connected to the water outlet bucket through a backwash pump water inlet pipe extending out of the host module box.

[0026] Preferably, the main module casing, each of the membrane frame module casings and the online drug washing module casing are respectively provided with a filter water inlet pipe interface, a backwash water inlet pipe interface, a filter water outlet interface and a backwash drain pipe interface at positions corresponding to the water inlet connecting pipe, the backwash connecting pipe, the water outlet connecting pipe and the drain connecting pipe, which are connected to the corresponding water inlet connecting pipe, the backwash connecting pipe, the water outlet connecting pipe and the drain connecting pipe.

[0027] Preferably, the host is encapsulated in a host control box, including a PLC, and the opening and operation of the water inlet frequency conversion pump, the backwash pump, the drug wash pump and all the electric butterfly valves of all the membrane frame modules are controlled by a preset program in the PLC.

[0028] All electrical equipment and online instruments are connected to the host control box of the encapsulated host.

[0029] Preferably, the pipes extending from the main module casing, each of the upper membrane frame module casings and the online drug washing module casing, and connected to the corresponding backwash connecting pipe, the water inlet connecting pipe, the water outlet connecting pipe or the drainage connecting pipe, are connected to the corresponding backwash connecting pipe, the water inlet connecting pipe, the water outlet connecting pipe or the drainage connecting pipe through a flexible joint.

[0030] Preferably, the host module is set to several levels according to the processing scale range, and the flow rate of the water inlet frequency conversion pump and the corresponding safety filter matches each of the levels.

[0031] Preferably, each of the membrane frame modules comprises more than two membrane elements; all the membrane elements operate in parallel; and each of the membrane frame modules is provided with a corresponding filtering and backwashing piping system; each of the filtering and backwashing piping systems can independently perform filtering and backwashing operations.

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

[0033] The present invention also discloses a water filtration method of a modular ultrafiltration device, including an alternating circulation mode of inlet filtration and backwashing;

[0034] The alternating circulation mode of water inlet filtration and backwashing is realized by the host controlling the water inlet variable frequency pump, the backwashing pump and all the electric butterfly valves, as follows:

[0035] When filtering the inlet water, open the electric butterfly valves between all the inner communication pipes of the membrane thread and the inlet communication pipe, and open the electric butterfly valves between all the outer communication pipes of the membrane thread and the outlet communication pipe.

[0036] And, close the electric butterfly valves between all the membrane wire inner communication pipes and the drainage communication pipes, and the electric butterfly valves between all the membrane wire outer communication pipes and the backwash communication pipes;

[0037] The water inlet variable frequency pump is turned on to filter the water in the water inlet bucket 1 through the security filter and the water inlet connecting pipe to each membrane element;

[0038] The water after being filtered by any of the membrane elements is output to the water outlet bucket through the water outlet connecting pipe;

[0039] During backwashing, backwashing of all the membrane elements is performed in sequence according to the corresponding membrane frame modules, as follows:

[0040] Close the electric butterfly valves between the corresponding inner communication pipes of the membrane wire and the water inlet communication pipe, and the electric butterfly valves between the corresponding outer communication pipes of the membrane wire and the water outlet communication pipe,

[0041] And, open the corresponding electric butterfly valve between the inner communication pipe of the membrane wire and the drainage communication pipe, and the corresponding electric butterfly valve between the outer communication pipe of the membrane wire and the backwash communication pipe;

[0042] The backwash pump is turned on to pass the water in the water outlet bucket through the safety filter and the backwash connecting pipe to each membrane element to flush each membrane element;

[0043] The water after flushing any of the membrane elements is discharged to the sewer through the drainage connecting pipe;

[0044] After all the membrane elements are backwashed, the electric butterfly valves between all the membrane wire inner communication pipes and the water inlet communication pipes, and the electric butterfly valves between all the membrane wire outer communication pipes and the water outlet communication pipes are opened.

[0045] And, close the electric butterfly valves between all the membrane wire inner communication pipes and the drainage communication pipes, and the electric butterfly valves between all the membrane wire outer communication pipes and the backwash communication pipes,

[0046] Enter the water inlet filtration again.

[0047] Preferably, it also includes a regular online drug washing mode;

[0048] The regular online chemical washing mode is realized by the main engine controlling the water inlet frequency conversion pump, the backwash pump and all the electric butterfly valves, and the chemical washing control box controlling the chemical washing pump and all the dosing pumps, including the acid washing soaking first and the alkali washing soaking later;

[0049] During the pickling process, the water inlet variable frequency pump and the backwash pump are turned off.

[0050] Close the electric butterfly valves between all the inner membrane wire communication pipes and the water inlet communication pipe, and the electric butterfly valves between all the outer membrane wire communication pipes and the water outlet communication pipe,

[0051] Open the electric butterfly valves between all the membrane wire inner communication pipes and the drainage communication pipe, and open the electric butterfly valves between all the membrane wire outer communication pipes and the backwash communication pipe;

[0052] The chemical washing pump and the dosing pump for dosing the acidic agent are turned on at the same time, and the mixed liquid of the water in the water outlet bucket and the acidic agent is flushed to all the membrane elements through the backwash connecting pipe for not less than 20 seconds.

[0053] Then, the chemical washing pump and the chemical dosing pump for adding acidic agents are turned off, and the electric butterfly valves between all the membrane wire internal communication pipes and the drainage connecting pipes are closed to soak all the membrane elements.

[0054] After at least 30 minutes, the electric butterfly valves between the communication pipes inside the membrane fibers and the drainage connecting pipes are opened, and then the backwash pump is started to clean all the membrane elements, and then the acid cleaning and soaking are completed;

[0055] During the alkaline washing, the water inlet frequency conversion pump and the backwash pump are turned off.

[0056] Close the electric butterfly valves between all the inner membrane wire communication pipes and the water inlet communication pipe, and the electric butterfly valves between all the outer membrane wire communication pipes and the water outlet communication pipe,

[0057] Open the electric butterfly valves between all the membrane wire inner communication pipes and the drainage communication pipe, and the electric butterfly valves 18 between all the membrane wire outer communication pipes and the backwash communication pipe;

[0058] The chemical washing pump, the dosing pump for dosing the alkaline agent, and the dosing pump for dosing sodium hypochlorite are turned on at the same time, and the mixed solution of the water, alkaline agent, and sodium hypochlorite in the water outlet bucket is passed through the backwash connecting pipe to all the membrane elements for a flushing period of not less than 20 seconds.

[0059] Then, the chemical washing pump and the chemical dosing pump for adding the acidic agent are turned off, and the electric butterfly valve 18 between all the membrane wire internal communication pipes and the drainage connecting pipes is closed to soak all the membrane elements.

[0060] After at least 30 minutes, the electric butterfly valves between all the membrane wire internal communication pipes and the drainage connecting pipes are opened, and then the backwash pump is started to clean all the membrane elements, and then the alkaline cleaning soaking is completed.

[0061] Beneficial effects of the present invention:

[0062] The present invention can increase the processing scale at any time by selecting the mainframe module and the online drug washing module of the appropriate scale and grade and adjusting the number of membrane rack modules, so that the user can expand the scale at any time, and at the same time greatly reduce the engineering cost and time of the expansion, and has significant economic benefits.

[0063] The present invention can effectively ensure the stability of the operation of the ultrafiltration device, realize offline maintenance through module replacement, avoid the failure of the entire ultrafiltration device to operate due to the failure of certain equipment, and improve the water supply guarantee rate.

[0064] The present invention has a simple structure, is easy to operate and maintain, realizes a reasonable combination of modules, is convenient for product production, and effectively reduces the equipment cost.

[0065] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic structural diagram of an embodiment of the present invention is shown.

[0067] In the figure, 1, water inlet bucket, 2, water outlet bucket, 3, host module box, 4, membrane frame module box, 5, online drug washing module box, 6, water inlet frequency conversion pump, 7, backwash pump, 8, security filter, 9, membrane element, 10, drug washing pump, 11, pipeline mixer, 12, dosing pump, 13, drug barrel, 14, backwash connecting pipe, 15, water inlet connecting pipe, 16, water outlet connecting pipe, 17, drainage connecting pipe, 18, electric butterfly valve, 19, host control box, 20, drug washing 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 wire external communication pipe, 27, membrane wire internal communication pipe, 28, drug washing pump outlet pipe. DETAILED DESCRIPTION

[0068] Example

[0069] like Figure 1As shown, the modular ultrafiltration device includes a host module, two or more membrane frame modules and an online drug washing module which are modularly packaged in a host module box 3, two or more membrane frame module boxes 4 and an online drug washing module box 5 respectively;

[0070] The host module box 3, all membrane rack module boxes 4 and online drug washing module boxes 5 are arranged in a straight line in sequence, and the side is provided with a backwash connecting pipe 14, a water inlet connecting pipe 15, a water outlet connecting pipe 16 and a drainage connecting pipe 17 arranged along the same pipe position, and the corresponding host module, each corresponding membrane rack module and the corresponding online drug washing module are connected to the corresponding backwash connecting pipe 14, the corresponding water inlet connecting pipe 15, the corresponding water outlet connecting pipe 16 or the corresponding drainage connecting pipe 17 for interconnection operation;

[0071] The host module includes a water inlet variable frequency pump 6 and a backwash pump 7 which are controlled to start and stop by the host;

[0072] The water inlet variable frequency pump 6 is connected to the water inlet connecting pipe 15 through a pipe extending out of the main module housing 3;

[0073] The backwash pump 7 is connected to the backwash connecting pipe 14 through a pipe extending out of the main module housing 3;

[0074] Each membrane frame module includes a membrane element 9;

[0075] Each membrane element 9 is provided with a membrane wire outer communication pipe 26 and a membrane wire inner communication pipe 27 at both ends;

[0076] The other end of each membrane wire external communication pipe 26 is connected to the water inlet communication pipe 15 and the drainage communication pipe 17 respectively through two pipes provided with electric butterfly valves 18;

[0077] The other end of each membrane wire internal communication pipe 27 is connected to the backwash communication pipe 14 and the water outlet communication pipe 16 respectively through two pipes provided with electric butterfly valves 18;

[0078] All electric butterfly valves 18 are opened and closed by the host machine;

[0079] The online drug washing module includes a drug washing pump 10, two or more drug dosing pumps 12, drug barrels 13 matching the number of drug dosing pumps 12, and a drug washing control box 20;

[0080] All the dosing pumps 12 are respectively arranged corresponding to the corresponding medicine barrels 13;

[0081] The inlet of the drug washing pump 10 is connected to the water outlet connecting pipe 16 through a pipe extending out of the online drug washing module housing 5, and the outlet is connected to the backwash connecting pipe 14 through the drug washing pump outlet pipe 28;

[0082] The water outlet pipe 28 of the drug washing pump is provided with a pipeline mixer 11, and is connected to the outlets of all the drug dosing pumps 12 through a drug dosing pipe 21 provided in the pipeline mixer 11;

[0083] The drug washing control box 20 controls all the drug adding pumps 12 to operate in conjunction with the drug washing pump 10 .

[0084] In the present invention, the host module, the two or more membrane frame modules and the online drug washing module, which are modularly packaged in the host module box 3, the two or more membrane frame module boxes 4 and the online drug washing module box 5 respectively, are connected at specified pipe positions through various pipes of the same diameter, wherein the backwash connecting pipe 14 and the water inlet connecting pipe 15 are located at the upper part of the module, and the water outlet connecting pipe 16 and the drainage connecting pipe 17 are located at the lower part of the module, thereby ensuring that the hydraulic flow of the entire ultrafiltration device is completely combined together.

[0085] According to the change of water inlet flow of the host module, the number of membrane rack modules can be adjusted at any time to meet the user's requirements for different processing volumes. Since the membrane rack modules can be increased or decreased at any time, the flexibility and stability of the water supply of the ultrafiltration device are improved.

[0086] The number of membrane elements 9 of the membrane frame module can be determined as required and operated in parallel. Each membrane frame module is provided with a corresponding filtering and backwashing pipeline system, and can perform filtering and backwashing operations independently.

[0087] In some embodiments, in the main module housing 3, a safety filter 8 is provided on the pipe connecting the water inlet variable frequency pump 6 to the water inlet connecting pipe 15, and on the pipe connecting the backwash pump 7 to the backwash connecting pipe 14;

[0088] The water inlet frequency conversion pump 6 is connected to the water inlet bucket 1 through the water inlet pump water inlet pipe 22 extending out of the host module box 3; the backwash pump 7 is connected to the water outlet bucket 2 through the backwash pump water inlet pipe 23 extending out of the host module box 3.

[0089] In certain embodiments, the host module housing 3, each membrane rack module housing 4 and the online drug washing module housing 5 are respectively provided with a filter water inlet pipe interface, a backwash water inlet pipe interface, a filter water outlet interface and a backwash drainage pipe interface at the positions corresponding to the water inlet connecting pipe 15, the backwash connecting pipe 14, the water outlet connecting pipe 16 and the drainage connecting pipe 17, and are connected to the corresponding water inlet connecting pipe 15, the backwash connecting pipe 14, the water outlet connecting pipe 16 and the drainage connecting pipe 17.

[0090] In some embodiments, the host is encapsulated in a host control box 19, including a PLC, which controls the opening and operation of the water inlet frequency conversion pump 6, the backwash pump 7, the chemical wash pump 10 and all the electric butterfly valves of all membrane rack modules through a preset program in the PLC.

[0091] All electrical equipment and online instruments are connected to the host control box 19 of the encapsulated host.

[0092] In some embodiments, the pipes extending from the main module casing 3, each upper membrane rack module casing 4 and the online drug washing module casing 5, and connected to the corresponding backwash connecting pipe 14, the water inlet connecting pipe 15, the water outlet connecting pipe 16 or the drainage connecting pipe 17, are connected to the corresponding backwash connecting pipe 14, the water inlet connecting pipe 15, the water outlet connecting pipe 16 or the drainage connecting pipe 17 through a flexible joint.

[0093] In some embodiments, the host module is set to several levels according to the processing scale range, and the flow rate of the water inlet variable frequency pump 6 and the corresponding safety filter 8 matches each level.

[0094] In some embodiments, each membrane frame module includes more than two membrane elements 9; all membrane elements 9 operate in parallel; and each membrane frame module is provided with a corresponding filtering and backwashing piping system; each filtering and backwashing piping system can independently perform filtering and backwashing operations.

[0095] In some embodiments, the online chemical washing module includes a chemical washing pump 10 including three chemical dosing pumps 12 for respectively pumping an acidic agent, an alkaline agent and a sodium hypochlorite agent into a pipeline mixer 11 and a matching number of chemical barrels 13 .

[0096] The present invention also discloses a water filtration method of a modular ultrafiltration device, including an alternating circulation mode of water inlet filtration and backwashing;

[0097] The alternating circulation mode of inlet water filtration and backwashing is realized by the host controlling the inlet frequency conversion pump 6, backwashing pump 7 and all electric butterfly valves 18, as follows:

[0098] When filtering the inlet water, open the electric butterfly valves 18 between all the membrane wire inner communication pipes 27 and the water inlet communication pipe 15, and open the electric butterfly valves 18 between all the membrane wire outer communication pipes 26 and the water outlet communication pipe 16.

[0099] And, close all the electric butterfly valves 18 between the membrane wire inner communication pipe 27 and the drainage communication pipe 17, and all the electric butterfly valves 18 between the membrane wire outer communication pipe 26 and the backwash communication pipe 14;

[0100] The water inlet variable frequency pump 6 is turned on, and the water in the water inlet bucket 1 is filtered through the safety filter 8 and the water inlet connecting pipe 15 to each membrane element 9;

[0101] The water after being filtered by any membrane element 9 is output to the water outlet bucket 2 through the water outlet connecting pipe 16;

[0102] During backwashing, all membrane elements 9 are backwashed in turn according to the corresponding membrane frame modules, as follows: backwashing adopts a mode of cleaning each membrane frame module in turn, so the backwash pump 7 and its safety filter 8 are universal.

[0103] Close the corresponding electric butterfly valves 18 between all membrane inner communication pipes 27 and the water inlet communication pipe 15, and the corresponding electric butterfly valves 18 between the membrane outer communication pipes 26 and the water outlet communication pipe 16.

[0104] And, open the electric butterfly valve 18 between the corresponding membrane wire inner communication pipe 27 and the drainage communication pipe 17, and the electric butterfly valve 18 between the corresponding membrane wire outer communication pipe 26 and the backwash communication pipe 14;

[0105] The backwash pump 7 is turned on to pass the water in the water outlet bucket 2 through the safety filter 8 and the backwash connecting pipe 14 to each membrane element 9, so as to flush each membrane element 9;

[0106] The water after flushing any membrane element 9 is discharged to the sewer through the drainage connecting pipe 17;

[0107] After all membrane elements 9 are backwashed, the electric butterfly valves 18 between all membrane wire inner communication pipes 27 and the water inlet communication pipe 15, and the electric butterfly valves 18 between all membrane wire outer communication pipes 26 and the water outlet communication pipe 16 are opened.

[0108] And, close all the electric butterfly valves 18 between the membrane wire inner communication pipe 27 and the drainage communication pipe 17, and all the electric butterfly valves 18 between the membrane wire outer communication pipe 16 and the backwash communication pipe 14.

[0109] Enter the water inlet filtration again.

[0110] In some embodiments, it also includes a regular online drug washing mode;

[0111] The regular online chemical washing mode is realized by the main engine controlling the water inlet frequency conversion pump 6, the backwash pump 7 and all the electric butterfly valves 18, and the chemical washing control box 20 controlling the chemical washing pump 10 and all the dosing pumps 12, including the acid washing soaking first and the alkali washing soaking later;

[0112] During pickling, turn off the water inlet variable frequency pump 6 and backwash pump 7.

[0113] Close the electric butterfly valves 18 between all the inner membrane wire communication pipes 27 and the water inlet communication pipe 15, and the electric butterfly valves 18 between all the outer membrane wire communication pipes 26 and the water outlet communication pipe 16.

[0114] Open all the electric butterfly valves 18 between the membrane wire inner communication pipes 27 and the drainage communication pipes 17, and all the electric butterfly valves 18 between the membrane wire outer communication pipes 26 and the backwash communication pipes 14;

[0115] The chemical washing pump 10 and the dosing pump 12 for dosing the acidic agent are turned on at the same time, and the mixed liquid of the water in the water outlet bucket 2 and the acidic agent is flushed to all membrane elements 9 through the backwash connecting pipe 14. The flushing time is generally not less than 20 seconds.

[0116] Then, turn off the chemical washing pump 10 and the dosing pump 12 for dosing the acidic agent, and close the electric butterfly valve 18 between all the membrane wire internal communication pipes 27 and the drainage connecting pipes 17, and soak all the membrane elements 9.

[0117] After at least 30 minutes, open the electric butterfly valve 18 between the communication pipe 27 and the drainage connecting pipe 17 of all membrane fibers, and then start the backwash pump 7 to clean all membrane elements 9 and complete the acid washing and soaking;

[0118] During the alkaline cleaning, turn off the water inlet variable frequency pump 6 and the backwash pump 7.

[0119] Close the electric butterfly valves 18 between all the inner membrane wire communication pipes 27 and the water inlet communication pipe 15, and the electric butterfly valves 18 between all the outer membrane wire communication pipes 26 and the water outlet communication pipe 16.

[0120] Open all the electric butterfly valves 18 between the membrane wire inner communication pipes 27 and the drainage communication pipes 17, and all the electric butterfly valves 18 between the membrane wire outer communication pipes 26 and the backwash communication pipes 14;

[0121] The chemical washing pump 10, the dosing pump 12 for dosing alkaline agent and the dosing pump 12 for dosing sodium hypochlorite are started at the same time, and the mixed solution of water, alkaline agent and sodium hypochlorite in the water outlet bucket 2 is flushed to all membrane elements 9 through the backwash connecting pipe 14, and the flushing time is generally not less than 20 seconds.

[0122] Then, turn off the chemical washing pump 10 and the dosing pump 12 for dosing the acidic agent, and close the electric butterfly valve 18 between all the membrane wire internal communication pipes 27 and the drainage connecting pipes 17, and soak all the membrane elements 9.

[0123] After at least 30 minutes, open the electric butterfly valve 18 between all the membrane wire internal communication pipes 27 and the drainage connecting pipe 17, and then start the backwash pump 7 to clean all the membrane elements 9 and complete the alkaline washing and soaking.

[0124] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A modular ultrafiltration device; characterized in that: It comprises a host module, two or more membrane rack modules and an online drug washing module which are modularized and respectively packaged in a host module box (3), two or more membrane rack module boxes (4) and an online drug washing module box (5); The host module housing (3), all the membrane rack module housings (4) and the online drug washing module housing (5) are sequentially arranged in a straight line, and the side is provided with a backwash connecting pipe (14), a water inlet connecting pipe (15), a water outlet connecting pipe (16) and a drainage connecting pipe (17) arranged along the same pipe position, and the corresponding host module, each corresponding membrane rack module and the corresponding online drug washing module are connected to the corresponding backwash connecting pipe (14), the corresponding water inlet connecting pipe (15), the corresponding water outlet connecting pipe (16) or the corresponding drainage connecting pipe (17) for interconnected operation; The host module comprises a water inlet frequency conversion pump (6) and a backwash pump (7) whose opening and closing are controlled by the host; The water inlet frequency conversion pump (6) is connected to the water inlet connecting pipe (15) via a pipeline extending out of the main module housing (3); The backwash pump (7) is connected to the backwash connecting pipe (14) via a pipeline extending out of the host module housing (3); Each of the membrane frame modules comprises a membrane element (9); Both ends of each membrane element (9) are provided with a membrane wire outer communication pipe (26) and a membrane wire inner communication pipe (27); The other end of each of the membrane-thread external communication pipes (26) is respectively connected to the water inlet communication pipe (15) and the drainage communication pipe (17) through two pipes provided with electric butterfly valves (18); The other end of each of the membrane wire internal communication pipes (27) is respectively connected to the backwash connecting pipe (14) and the water outlet connecting pipe (16) through two pipes provided with the electric butterfly valve (18); All the electric butterfly valves (18) are opened and closed by the host machine; The online drug washing module comprises a drug washing pump (10), two or more drug dosing pumps (12), drug barrels (13) matching the number of the drug dosing pumps (12), and a drug washing control box (20); All the drug adding pumps (12) are respectively arranged corresponding to the corresponding drug barrels (13); The inlet of the drug washing pump (10) is connected to the water outlet connecting pipe (16) through a pipe extending out of the online drug washing module housing (5), and the outlet is connected to the backwash connecting pipe (14) through the drug washing pump water outlet pipe (28); The water outlet pipe (28) of the drug washing pump is provided with a pipeline mixer (11), and is connected to the outlets of all the drug dosing pumps (12) via a drug dosing pipe (21) provided on the pipeline mixer (11); The drug washing control box (20) controls all the drug adding pumps (12) to operate in conjunction with the drug washing pump (10).

2. The modular ultrafiltration device according to claim 1, characterized in that In the host module housing (3), a safety filter (8) is provided on the pipe connecting the water inlet variable frequency pump (6) to the water inlet connecting pipe (15), and on the pipe connecting the backwash pump (7) to the backwash connecting pipe (14); The water inlet frequency conversion pump (6) is connected to the water inlet bucket (1) via a water inlet pump water inlet pipe (22) extending out of the host module housing (3); the backwash pump (7) is connected to the water outlet bucket (2) via a backwash pump water inlet pipe (23) extending out of the host module housing (3).

3. The modular ultrafiltration device according to claim 1, characterized in that The host module housing (3), each of the membrane rack module housings (4) and the online drug washing module housing (5) are provided with a filter water inlet pipe interface, a backwash water inlet pipe interface, a filter water outlet interface and a backwash drainage pipe interface at positions corresponding to the water inlet connecting pipe (15), the backwash connecting pipe (14), the water outlet connecting pipe (16) and the drainage connecting pipe (17), respectively, and are connected to the corresponding water inlet connecting pipe (15), the backwash connecting pipe (14), the water outlet connecting pipe (16) and the drainage connecting pipe (17).

4. The modular ultrafiltration device according to claim 1, characterized in that: The host is encapsulated in a host control box (19), which includes a PLC. The opening and operation of the water inlet frequency conversion pump (6), the backwash pump (7), the drug wash pump (10) and all the electric butterfly valves of all the membrane frame modules are controlled by a preset program in the PLC. All electrical equipment and online instruments are connected to the host control box (19) of the encapsulated host.

5. The modular ultrafiltration device according to claim 1, characterized in that: The pipes extending out of the main module casing (3), each of the upper membrane rack module casings (4) and the online drug washing module casing (5) and connected to the corresponding backwash connecting pipe (14), the water inlet connecting pipe (15), the water outlet connecting pipe (16) or the drainage connecting pipe (17) are connected to the corresponding backwash connecting pipe (14), the water inlet connecting pipe (15), the water outlet connecting pipe (16) or the drainage connecting pipe (17) through a flexible joint.

6. The modular ultrafiltration device according to claim 1, characterized in that: The host module is provided with a plurality of grades according to the processing scale range, and the flow rate of the water inlet variable frequency pump (6) and the corresponding safety filter (8) is matched with each grade.

7. The modular ultrafiltration device according to claim 1, characterized in that: Each of the membrane frame modules comprises more than two membrane elements (9); all of the membrane elements (9) operate in parallel; and each of the membrane frame modules is provided with a corresponding filtering and backwashing pipeline system; each of the filtering and backwashing pipeline systems can independently perform filtering and backwashing operations.

8. The modular ultrafiltration device according to claim 1, characterized in that: The online drug washing module comprises a drug washing pump (10), including three drug dosing pumps (12) for respectively pumping an acidic agent, an alkaline agent and a sodium hypochlorite agent into the pipeline mixer (11), and a matching number of drug barrels (13).

9. The water filtration method of the modular ultrafiltration device according to claim 1, characterized in that: Including water inlet filtration and backwash alternating circulation mode; The water inlet filtration and backwashing alternating circulation 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), as follows: During water inlet filtration, the electric butterfly valves (18) between all the membrane thread inner communication pipes (27) and the water inlet communication pipe (15), and the electric butterfly valves (18) between all the membrane thread outer communication pipes (26) and the water outlet communication pipe (16) are opened. Furthermore, the electric butterfly valves (18) between all the membrane wire inner communication pipes (27) and the drainage communication pipes (17), and the electric butterfly valves (18) between all the membrane wire outer communication pipes (26) and the backwash communication pipes (14) are closed; The water inlet variable frequency pump (6) is turned on to filter the water in the water inlet bucket 1 through the safety filter (8) and the water inlet connecting pipe (15) to each membrane element (9); The water filtered by any of the membrane elements (9) is output to the water outlet bucket (2) through the water outlet connecting pipe (16); During backwashing, backwashing of all the membrane elements (9) is performed in sequence according to the corresponding membrane frame modules, as follows: Close the electric butterfly valves (18) between the corresponding membrane thread inner communication pipes (27) and the water inlet communication pipes (15), and the electric butterfly valves (18) between the corresponding membrane thread outer communication pipes (26) and the water outlet communication pipes (16). and opening the electric butterfly valve (18) between the corresponding membrane wire inner communication pipe (27) and the drainage communication pipe (17), and the electric butterfly valve (18) between the corresponding membrane wire outer communication pipe (26) and the backwash communication pipe (14); The backwash pump (7) is turned on to pass the water in the water outlet bucket (2) through the safety filter (8) and the backwash connecting pipe (14) to each membrane element (9), thereby flushing each membrane element (9); The water after flushing any of the membrane elements (9) is discharged to the sewer through the drainage connecting pipe (17); After all the membrane elements (9) have been backwashed, the electric butterfly valves (18) between all the membrane wire inner communication pipes (27) and the water inlet communication pipe (15), and the electric butterfly valves (18) between all the membrane wire outer communication pipes (26) and the water outlet communication pipe (16) are opened. Furthermore, the electric butterfly valves (18) between all the membrane wire inner communication pipes (27) and the drainage communication pipes (17), and the electric butterfly valves (18) between all the membrane wire outer communication pipes (16) and the backwash communication pipes (14) are closed. Enter the water inlet filtration again.

10. The water filtration method of the modular ultrafiltration device according to claim 9, characterized in that: It also includes a regular online drug washing mode; The regular online chemical washing mode is realized by the main engine controlling the water inlet frequency conversion pump (6), the backwash pump (7) and all the electric butterfly valves (18), and the chemical washing control box (20) controlling the chemical washing pump (10) and all the dosing pumps (12), including acid washing soaking first and alkali washing soaking later; During the pickling soaking, the water inlet variable frequency pump (6) and the backwash pump (7) are turned off. Close the electric butterfly valves (18) between all the inner membrane thread communication pipes (27) and the water inlet communication pipe (15), and close the electric butterfly valves (18) between all the outer membrane thread communication pipes (26) and the water outlet communication pipe (16). Opening the electric butterfly valves (18) between all the membrane thread inner communication pipes (27) and the drainage communication pipe (17), and opening the electric butterfly valves (18) between all the membrane thread outer communication pipes (26) and the backwash communication pipe (14); The chemical washing pump (10) and the chemical dosing pump (12) for dosing the acidic agent are turned on at the same time, and the mixed liquid of the water in the water outlet bucket (2) and the acidic agent is flushed through the backwash connecting pipe (14) to all the membrane elements (9) for not less than 20 seconds. Then, the chemical washing pump (10) and the chemical dosing pump (12) for adding the acidic agent are turned off, and the electric butterfly valves (18) between all the membrane wire internal communication pipes (27) and the drainage connecting pipes (17) are turned off, and all the membrane elements (9) are soaked. After at least 30 minutes, the electric butterfly valve (18) between all the membrane wire internal communication pipes (27) and the drainage connecting pipe (17) is opened, and then the backwash pump (7) is started to clean all the membrane elements (9), and then the acid cleaning soaking is completed; During the alkaline washing and soaking, the water inlet frequency conversion pump (6) and the backwash pump (7) are turned off. Close the electric butterfly valves (18) between all the inner membrane thread communication pipes (27) and the water inlet communication pipe (15), and close the electric butterfly valves (18) between all the outer membrane thread communication pipes (26) and the water outlet communication pipe (16). Opening the electric butterfly valves (18) between all the membrane thread inner communication pipes (27) and the drainage communication pipe (17), and opening the electric butterfly valves (18) between all the membrane thread outer communication pipes (26) and the backwash communication pipe (14); The chemical washing pump (10), the chemical dosing pump (12) for dosing the alkaline agent, and the chemical dosing pump (12) for dosing sodium hypochlorite are simultaneously turned on, and the mixed solution of the water, alkaline agent, and sodium hypochlorite in the water outlet bucket (2) is passed through the backwash connecting pipe (14) to all the membrane elements (9) for a period of not less than 20 seconds. Then, the chemical washing pump (10) and the chemical dosing pump (12) for adding the acidic agent are turned off, and the electric butterfly valves (18) between all the membrane wire internal communication pipes (27) and the drainage connecting pipes (17) are turned off, and all the membrane elements (9) are soaked. After at least 30 minutes, the electric butterfly valve (18) between all the membrane wire internal communication pipes (27) and the drainage connecting pipe (17) is opened, and then the backwash pump (7) is started to clean all the membrane elements (9), and the alkaline cleaning soaking is completed.

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