Ultrafiltration membrane water treatment device

Abstract

The present disclosure relates to an ultrafiltration membrane water treatment device, which can improve the stability of the water output of the ultrafiltration membrane water treatment device. The ultrafiltration membrane water treatment device includes a water inlet main pipe, a water production main pipe, at least two ultrafiltration membrane components, a total water inlet pump and a total water inlet valve; the water inlet end of the water inlet main pipe is connected to the water inlet of the ultrafiltration membrane water treatment device, the water inlets of each ultrafiltration membrane component are respectively connected to the water inlet main pipe through the water inlet branch, the water outlets of each ultrafiltration membrane component are respectively connected to the water production main pipe through the water outlet branch, the water outlet end of the water production main pipe is connected to the water production port of the ultrafiltration membrane water treatment device, and the total water inlet pump and the total water inlet valve are arranged on the water inlet main pipe; wherein, a temperature sensor is arranged on the water inlet main pipe, the temperature sensor is connected to the total water inlet pump in communication, the temperature sensor is connected to the total water inlet valve in communication, the motor frequency of the total water inlet pump is adjustable according to the return amount of the temperature sensor, and the opening of the total water inlet valve is adjustable according to the return amount of the temperature sensor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of water treatment, and in particular to an ultrafiltration membrane water treatment device. Background Art

[0002] Ultrafiltration membrane is a microporous filtration membrane. When appropriate pressure is applied to one side of the membrane, the solvent in the solution and some solutes with lower molecular weight penetrate through the tiny pores of the ultrafiltration membrane to the other side of the membrane, while solutes with higher molecular weight or some emulsified micelles are retained, thus achieving the effect of filtration and separation. In the field of water treatment, ultrafiltration membrane technology has higher filtration accuracy and better water quality after treatment, so it is widely used.

[0003] The ultrafiltration membrane water treatment device in the prior art has the problem of unstable water production, which is not conducive to industrial application.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The purpose of the present disclosure is to provide an ultrafiltration membrane water treatment device, which can improve the stability of water production of the ultrafiltration membrane water treatment device.

[0006] The present invention provides an ultrafiltration membrane water treatment device, comprising: a water inlet main pipe, a water production main pipe, at least two ultrafiltration membrane modules, a main water inlet pump and a main water inlet valve; the water inlet end of the water inlet main pipe is connected to the water inlet of the ultrafiltration membrane water treatment device, the water inlets of each ultrafiltration membrane module are respectively connected to the water inlet main pipe through the water inlet branch, the water outlets of each ultrafiltration membrane module are respectively connected to the water production main pipe through the water outlet branch, the water outlet end of the water production main pipe is connected to the water production port of the ultrafiltration membrane water treatment device, and the main water inlet pump and the main water inlet valve are arranged on the water inlet main pipe;

[0007] Among them, a temperature sensor and a signal distributor are provided on the water inlet main pipe, the input end of the signal distributor is connected to the temperature sensor, the first output end of the signal distributor is connected to the main water inlet pump, and the second output end of the signal distributor is connected to the main water inlet valve, so that the temperature sensor is communicated with the main water inlet pump, and the temperature sensor is communicated with the main water inlet valve; the motor frequency of the main water inlet pump can be adjusted according to the return amount of the temperature sensor, and the opening of the main water inlet valve can be adjusted according to the return amount of the temperature sensor; the signal distributor is fixedly connected to the water inlet main pipe through a clamp-type bracket; the temperature sensor is an embedded pipe wall temperature probe, and the detection surface of the temperature sensor is at an angle of 30°-60° with the water flow direction in the water inlet main pipe.

[0008] In an exemplary embodiment of the present disclosure, the main water inlet pump is arranged upstream of the main water inlet valve, and the ultrafiltration membrane water treatment device also includes a first turbidity meter; the first turbidity meter is arranged in the water inlet main pipe, and the first turbidity meter is arranged upstream of the main water inlet pump.

[0009] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device also includes a total water production valve and a second turbidity meter, the total water production valve is arranged on the water production main pipe; the second turbidity meter is arranged on the water production main pipe, and the second turbidity meter is arranged downstream of the total water production valve.

[0010] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device also includes a turbidity calculation module, which is communicatively connected to the first turbidity meter and the second turbidity meter. The turbidity calculation module is used to obtain the return amount of the first turbidity meter and the second turbidity meter. The turbidity calculation module is also communicatively connected to the total water inlet pump, and the motor frequency of the total water inlet pump can be adjusted according to the input of the turbidity calculation module.

[0011] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes: a first pressure transmitter, which is arranged on the water inlet main pipe; and at least two second pressure transmitters, which are respectively arranged on the water inlet branch pipes.

[0012] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device also includes a backwash water tank and a backwash water pump, the water inlet end of the backwash water tank is connected to the water production main pipe, the water outlet end of the backwash water tank is connected to the water outlet of the ultrafiltration membrane assembly through a backwash pipeline, and the water inlet of the ultrafiltration membrane assembly is also connected to the first wastewater collection tank through a first wastewater pipe; the backwash water pump is arranged in the backwash pipeline; wherein, the motor frequency of the backwash water pump can be set adjustably.

[0013] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes: a third pressure transmitter, which is arranged in the backwash pipeline.

[0014] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device also includes a chemical backwash storage tank and a chemical backwash pump. The chemical backwash storage tank is connected to the backwash pipeline through a chemical backwash pipeline. The chemical backwash pump is arranged in the chemical backwash pipeline. A first pH sensor is arranged in the chemical backwash storage tank. The first pH sensor is communicatively connected to the chemical backwash pump; wherein the motor frequency of the chemical backwash pump can be adjusted according to the return amount of the first pH sensor.

[0015] In an exemplary embodiment of the present disclosure, a second pH sensor is provided on the water inlet main pipe, the second pH sensor is communicatively connected to the chemical backwash pump, and the motor frequency of the chemical backwash pump is adjustably set according to the return amount of the second pH sensor; the ultrafiltration membrane water treatment device also includes a chemical cleaning tank and a chemical cleaning pump, the chemical cleaning tank is connected to the water inlet of the ultrafiltration membrane assembly through a chemical cleaning pipeline, and the chemical cleaning pump is arranged in the chemical cleaning pipeline; the ultrafiltration membrane assembly has a drain outlet adjacent to the water outlet, and the drain outlet is connected to the drug wastewater pool.

[0016] In an exemplary embodiment of the present disclosure, the chemical backwash pump is communicatively connected with the backwash water pump; wherein the relationship between the flow rate Q1 of the backwash water pump when the chemical backwash pump is turned on and the flow rate Q2 of the backwash water pump when the chemical backwash pump is turned off satisfies 1 / 3≤Q1 / Q2≤2 / 3.

[0017] In the ultrafiltration membrane water treatment device disclosed in the present invention, a temperature sensor is provided on the water inlet main pipe, and the motor frequency of the total water inlet pump and the opening of the total water inlet valve can be adjusted according to the return amount of the temperature sensor, so that the transmembrane pressure difference can be adjusted by variable frequency regulation of the total water inlet pump and the opening of the total water inlet valve, thereby ensuring the constant membrane flux of the ultrafiltration membrane assembly and achieving a constant water production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0019] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0020] Figure 1 It is a schematic diagram of the architecture of an exemplary embodiment of the ultrafiltration membrane water treatment device disclosed in the present invention;

[0021] Figure 2 It is a schematic diagram of the principle of an exemplary embodiment of the ultrafiltration membrane water treatment device disclosed in the present invention.

[0022] The following are the descriptions of the reference numerals:

[0023] 11. Water inlet main pipe; 12. Water production main pipe; 2. Ultrafiltration membrane assembly; 21. Water inlet; 22. Water outlet; 23. Drain; 31. Main water inlet pump; 41. Main water inlet valve; 42. Main water production valve; 43. Branch water inlet valve; 51. Water inlet branch; 52. Water outlet branch; 6. Backwash water tank; 61. Backwash water pump; 62. Backwash pipeline; 63. First wastewater collection tank; 64. Second wastewater collection tank; 7. Chemical backwash pump; 8. Chemical cleaning pump. DETAILED DESCRIPTION

[0024] The example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed descriptions will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0025] Unless otherwise specified or indicated, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The present disclosure uses "first" and "second" only as labels and does not limit the quantity, importance or order of its objects. The words "include" or "comprising" mean that the elements appearing before the word include the elements listed after the word and their equivalents, but do not exclude other elements.

[0026] The terms "connection", "connectivity", etc. should be understood in a broad sense. For example, "connectivity" can be direct connection or indirect connection through an intermediate medium. "Communication connection" can be a wired communication connection or a wireless communication connection. It can be direct communication or indirect signal connectivity through an intermediate medium. The "water inlet end" and "water outlet end" of the pipeline or water tank described in the present disclosure are defined according to the normal flow direction of the liquid during the operation of the ultrafiltration membrane water treatment device. For example, the water inlet end of the water tank is the end of the pipeline through which liquid flows into the water tank during the operation of the ultrafiltration membrane water treatment device of the present disclosure, and the water outlet end of the water tank is the end of the pipeline through which the liquid in the water tank flows out.

[0027] The present invention provides an ultrafiltration membrane water treatment device, referring to Figure 1As shown, the ultrafiltration membrane water treatment device includes: an inlet main pipe 11, a production water main pipe 12, at least two ultrafiltration membrane modules 2, a total water inlet pump 31 and a total water inlet valve 41. The water inlet end of the water inlet main pipe 11 is connected to the water inlet of the ultrafiltration membrane water treatment device, the water inlet of each ultrafiltration membrane module 2 is connected to the water inlet main pipe 11 through the water inlet branch 51, the water outlet 22 of each ultrafiltration membrane module 2 is connected to the production water main pipe 12 through the water outlet branch 52, the water outlet end of the production water main pipe 12 is connected to the water production port of the ultrafiltration membrane water treatment device, and the total water inlet pump 31 and the total water inlet valve 41 are arranged on the water inlet main pipe 11. Among them, a temperature sensor and a signal distributor are provided on the water inlet main pipe 11, the input end of the signal distributor is connected to the temperature sensor, the first output end of the signal distributor is connected to the main water inlet pump 31, and the second output end of the signal distributor is connected to the main water inlet valve 41, so that the temperature sensor is communicated with the main water inlet pump 31, the temperature sensor is communicated with the main water inlet valve 41, the motor frequency of the main water inlet pump 31 can be adjusted according to the return amount of the temperature sensor, and the opening of the main water inlet valve 41 can be adjustably set according to the return amount of the temperature sensor; the signal distributor is fixedly connected to the water inlet main pipe 11 through a clamp-type bracket; the temperature sensor is an embedded pipe wall temperature probe, and the detection surface of the temperature sensor is at an angle of 30°-60° with the water flow direction in the water inlet main pipe 11.

[0028] Specifically, the ultrafiltration membrane water treatment device may include one or more ultrafiltration membrane units, and each ultrafiltration membrane unit may include one or more parallel ultrafiltration membrane components 2. For example, referring to Figure 1 As shown, an ultrafiltration membrane water treatment device includes two ultrafiltration membrane units, each of which includes a plurality of ultrafiltration membrane modules 2. The ultrafiltration membrane module 2 may have a water inlet 21 and a water outlet 22, the water inlet 21 of each ultrafiltration membrane module 2 is connected to the water inlet main pipe 11 through a water inlet manifold 51, the water outlet 22 of each ultrafiltration membrane module 2 is connected to the water inlet end of the water production main pipe 12 through a water outlet manifold 52, and the water outlet end of the water production main pipe 12 is connected to the water production port.

[0029] In the process of filtering the influent water to be treated by the ultrafiltration membrane water treatment device, the main inlet valve 41 is opened, and the main inlet pump 31 starts to run to provide the pressure required for filtration. Each inlet main pipe 11 can be provided with a branch inlet valve 43. When a specific ultrafiltration membrane unit (or a specific ultrafiltration membrane assembly 2) is working, the branch inlet valve 43 is opened, and the influent water to be treated flows from the inlet main pipe 11 into the inlet water branch 51, and enters the ultrafiltration membrane assembly 2 from the water inlet 21 for filtration. The filtered water enters the outlet water branch 52 through the outlet 22, converges to the water production main pipe 12, and flows out from the water production outlet.

[0030] After the experiment, it was found that the temperature has an impact on the driving force, water viscosity and membrane pore size of the entire membrane system. Specifically, when the inlet water temperature is different, the membrane flux of the ultrafiltration membrane assembly 2 also changes. In the ultrafiltration membrane water treatment device disclosed in the present invention, a temperature sensor and a signal distributor are provided on the water inlet main pipe 11. The temperature sensor is an embedded pipe wall temperature probe, and the detection surface is at an angle of 30°-60° with the water flow direction in the water inlet main pipe, which is conducive to obtaining accurate water inlet temperature; the signal distributor is fixedly connected to the water inlet main pipe through a clamp-type bracket, the input end of the signal distributor is connected to the temperature sensor, the first output end is connected to the total water inlet pump, and the second output end is connected to the total water inlet valve; the motor frequency of the total water inlet pump 31 and the opening of the total water inlet valve 41 are adjustable according to the return amount of the temperature sensor, so that the transmembrane pressure difference can be adjusted by the frequency conversion adjustment of the total water inlet pump 31 and the opening of the total water inlet valve 41, thereby ensuring that the membrane flux of the ultrafiltration membrane assembly 2 is constant and a constant water production is achieved.

[0031] Exemplarily, the temperature sensor can be arranged at a distance of 0.5-1.2 times the diameter of the water inlet branch 51 from the water inlet of the ultrafiltration membrane assembly 2, so that the motor frequency of the total water inlet pump 31 and the opening of the total water inlet valve 41 can track the return amount of the temperature sensor more accurately and match the membrane flux change of the ultrafiltration membrane assembly 2.

[0032] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes a backwashing water tank 6 and a backwashing water pump 61. Figure 1 As shown, the water inlet of the backwash water tank 6 can be connected to the water production main pipe 12, and part of the filtered water flows out from the water production port, and the other part is collected in the backwash water tank 6 for the backwash process. The water outlet of the backwash water tank 6 is connected to the water outlet 22 of the ultrafiltration membrane assembly 2 through the backwash pipeline 62, and the water inlet 21 of the ultrafiltration membrane assembly 2 is also connected to the first wastewater collection tank 63 through the first wastewater pipe, and the backwash water pump 61 is arranged in the backwash pipeline 62.

[0033] After the ultrafiltration membrane water treatment device has been working for a period of time, a layer of contamination will be deposited on the surface of the membrane. At this time, the filtration process can be stopped and the membrane element can be cleaned by backwashing. Specifically: a branch backwash valve can be provided on the branch pipe connected to the backwash pipeline 62 of the outlet 22 of each ultrafiltration membrane assembly 2. When backwashing a specific ultrafiltration membrane unit (or a specific ultrafiltration membrane assembly 2), the corresponding branch backwash valve is opened, the branch water inlet valve 43 is closed, and the backwash water pump 61 is turned on. The water in the backwash water tank 6 is lifted and pressurized and enters the ultrafiltration membrane assembly 2 from the outlet 22. The pressurized backwash water can wash the pollutants deposited on the membrane surface out of the system, thereby restoring the flux of the membrane element. The wastewater after backwashing can be discharged to the factory sewage network. In an exemplary embodiment, the wastewater after backwashing can flow into the first wastewater collection tank 63 through the first wastewater pipe.

[0034] Exemplarily, after the ultrafiltration membrane water treatment device has filtered for a specific time, a backwashing process can be performed. In an exemplary embodiment, a flow meter is provided at the water outlet, and the backwashing water pump 61 is connected to the flow meter of the water outlet in communication, and the backwashing water pump 61 is turned on in response to the return value of the flow meter of the water outlet, for example, when the flow of the water outlet is lower than a specific value, the backwashing process is automatically turned on. Exemplarily, the backwashing valve and the branch water inlet valve 43 also respond to the return value of the flow meter of the water outlet to ensure the normal operation of the backwashing process. In an exemplary embodiment, the water outlet of the ultrafiltration membrane water treatment device is connected to the water production pool, and a liquid level meter can be provided in the water production pool. The backwashing water pump 61, the backwashing valve, the branch water inlet valve 43, etc. are turned on in response to the return value of the liquid level meter of the water production pool. For example, when the liquid level of the water production pool is lower than a specific value, the backwashing process is automatically turned on.

[0035] Exemplarily, the motor frequency of the backwash water pump 61 is adjustable. For example, the motor frequency of the backwash water pump 61 is adjustable according to the temperature return amount of the backwash pipeline 62 .

[0036] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device also includes a first pressure transmitter provided in the water inlet main pipe 11 and a second pressure transmitter provided in the water inlet branch pipe 51, and the number of the second pressure transmitters may be equal to the number of the ultrafiltration membrane assemblies 2. The first pressure transmitter and the second pressure transmitter may be used to confirm the working pressure of the ultrafiltration membrane assembly 2 during the filtration process to ensure that the operating state of the ultrafiltration membrane assembly 2 is within a reasonable pressure range. Exemplarily, the ultrafiltration membrane water treatment device also includes a third pressure transmitter provided in the backwashing pipeline 62 to ensure that the pressure of the ultrafiltration membrane assembly 2 in the backwashing process is also within the allowable pressure range to prevent the backwashing process from damaging the ultrafiltration membrane assembly 2.

[0037] In an exemplary embodiment of the present disclosure, the total water inlet pump 31 is disposed upstream of the total water inlet valve 41, and the ultrafiltration membrane water treatment device further includes a first turbidity meter; the first turbidity meter is disposed in the water inlet main pipe 11. The first turbidity meter can detect the turbidity of the influent water in the water inlet main pipe 11. Exemplarily, the total water inlet pump 31 can be connected to the first turbidity meter for communication, and the total water inlet pump 31 determines the flow rate of the filtration process according to the return value of the first turbidity meter, and realizes the adaptation of the flow rate to the turbidity of the influent water through the frequency conversion regulation of the total water inlet pump 31.

[0038] Exemplarily, after the total water inlet pump 31 pressurizes the total water inlet, the pressure downstream of the total water inlet pump 31 is relatively large and the stability is relatively poor. In an exemplary embodiment of the present disclosure, the first turbidity meter is arranged upstream of the total water inlet pump 31 to improve the stability of the detection.

[0039] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes a total water production valve 42 and a second turbidity meter, wherein the total water production valve 42 is provided in the water production main pipe 12; and the second turbidity meter is provided in the water production main pipe 12. The second turbidity meter can detect the turbidity of the water produced in the water production main pipe 12. Exemplarily, the total water inlet pump 31 can be connected to the second turbidity meter for communication, and the total water inlet pump 31 adjusts the flow rate of the filtration process according to the return value of the second turbidity meter to achieve feedback regulation.

[0040] The pressure upstream of the total water production valve 42 is relatively high and has poor stability. In an exemplary embodiment of the present disclosure, the second turbidity meter is arranged in the pipeline section downstream of the total water production valve 42 where the pressure is relatively stable, which can improve the stability of the detection. Exemplarily, the second turbidity meter can use a flow-through online turbidity analyzer to avoid contaminating the produced water. It can be understood by those skilled in the art that the first turbidity meter can also use a flow-through online turbidity analyzer.

[0041] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes a turbidity calculation module, the turbidity calculation module is connected to the first turbidity meter and the second turbidity meter, the turbidity calculation module is used to obtain the return amount of the first turbidity meter and the second turbidity meter, and the turbidity calculation module is also connected to the total water inlet pump 31, and the motor frequency of the total water inlet pump 31 is adjustable according to the input of the turbidity calculation module. Specifically, the turbidity calculation module can judge the filtering effect of the ultrafiltration membrane assembly 2 according to the return amount of the first turbidity meter and the second turbidity meter, and control the water inlet flow rate of the total water inlet pump 31 accordingly.

[0042] In an exemplary embodiment of the present disclosure, the ultrafiltration membrane water treatment device further includes a chemical backwashing tank and a chemical backwashing pump 7. Figure 2As shown, the chemical backwashing tank is connected to the backwashing pipeline 62 through the chemical backwashing pipeline, and the chemical backwashing pump 7 is arranged in the chemical backwashing pipeline. Since the water contains various bacteria, organic matter, inorganic matter, etc., backwashing with clean water alone cannot completely restore the membrane flux of the ultrafiltration membrane assembly 2. Therefore, after the ultrafiltration membrane water treatment device has been working for a period of time, the membrane element can be cleaned by chemical backwashing. Specifically: after going through multiple aforementioned process flows of backwashing with water in the backwashing water tank 6, the chemical backwashing pump 7 can be used to put the chemicals in the chemical backwashing tank into the backwashing pipeline 62, and the pollutants on the membrane surface are completely removed by the chemical agents. The flow direction of the backwashing water with drugs in the pipeline and the ultrafiltration membrane assembly 2 has been described in the aforementioned exemplary embodiment, and will not be repeated here.

[0043] In an exemplary embodiment of the present disclosure, a first pH sensor is provided in the chemical backwash tank, and the first pH sensor is communicatively connected to the chemical backwash pump 7; wherein the motor frequency of the chemical backwash pump 7 is adjustably set according to the return amount of the first pH sensor. For example, during the chemical backwash process, a variety of drugs are added to the chemical backwash tank and mixed evenly in the chemical backwash tank, and the first pH sensor is used to obtain the pH value of the drug solution to ensure that the pH value of the drug solution meets the requirements for cleaning the ultrafiltration membrane assembly 2. The chemical backwash pump 7 performs frequency conversion adjustment according to the pH value of the drug solution, and changes the flow rate of the drug solution delivered to the backwash pipeline 62, so as to ensure that the pH during the chemical backwash process always matches the requirements of the ultrafiltration membrane assembly 2.

[0044] In an exemplary embodiment of the present disclosure, a second pH sensor is provided on the water inlet main pipe 11, and the second pH sensor is in communication connection with the chemical backwash pump 7, and the motor frequency of the chemical backwash pump 7 is adjustably set according to the return amount of the second pH sensor. For example, the second pH sensor is used to obtain the pH value of the total inlet water of the ultrafiltration membrane water treatment device to determine the need for cleaning the ultrafiltration membrane assembly 2. The chemical backwash pump 7 performs frequency conversion adjustment according to the pH value of the ultrafiltration membrane assembly 2, and changes the flow rate of the liquid medicine put into the backwash pipeline 62, which can ensure that the pH in the chemical backwash process always matches the need of the ultrafiltration membrane assembly 2.

[0045] Exemplarily, the ultrafiltration membrane water treatment device also includes a pH calculation module, which is connected to the first pH sensor and the second pH sensor in communication, and the pH calculation module is used to obtain the return amount of the first pH sensor and the second pH sensor. The pH calculation module is also connected to the chemical backwash pump 7 and the backwash water pump 61 in communication, and the motor frequency of the chemical backwash pump 7 and the backwash water pump 61 can be adjusted according to the input of the pH calculation module. Specifically, the pH calculation module can judge the cleaning requirements of the ultrafiltration membrane assembly 2 and the pH of the liquid according to the return amount of the first pH sensor and the second pH sensor, and control the dosage and the backwash water volume accordingly, so as to control the concentration and pH of the chemical backwash liquid and match it with the requirements of the ultrafiltration membrane assembly 2.

[0046] In an exemplary embodiment of the present disclosure, reference Figure 1 As shown, the ultrafiltration membrane water treatment device also includes a chemical cleaning tank and a chemical cleaning pump 8. The chemical cleaning tank is connected to the water inlet 21 of the ultrafiltration membrane assembly 2 through a chemical cleaning pipeline, and the chemical cleaning pump 8 is arranged in the chemical cleaning pipeline; the ultrafiltration membrane assembly 2 has a drain port 23 adjacent to the water outlet 22, and the drain port 23 is connected to the drug wastewater pool. After the ultrafiltration membrane water treatment device has been working for a period of time, for example, after multiple chemical backwashing processes, the chemical cleaning pump 8 can be used to flow the cleaning liquid in the chemical cleaning tank from the water inlet 21 of the ultrafiltration membrane assembly 2 into the ultrafiltration membrane assembly 2, and the ultrafiltration membrane assembly 2 is chemically cleaned, and the cleaned wastewater flows into the drug wastewater pool from the drain port 23.

[0047] Exemplarily, a fourth pressure transmitter is provided on the chemical cleaning pipeline to ensure that the pressure of the ultrafiltration membrane assembly 2 in the chemical cleaning process is also within the allowable pressure range. Exemplarily, the motor frequency of the chemical cleaning pump 8 is adjustable according to the return amount of the fourth pressure transmitter.

[0048] In an exemplary embodiment of the present disclosure, a first liquid level meter is provided in the chemical backwash tank to confirm the amount of liquid in the chemical backwash tank. A second liquid level meter may be provided in the chemical cleaning tank to confirm the amount of liquid in the chemical cleaning tank.

[0049] In an exemplary embodiment of the present disclosure, the water outlet 22 of the ultrafiltration membrane assembly 2 is also connected to the second wastewater collection tank 64 through a second wastewater pipe. During the filtration process, the filtered unqualified water can be discharged into the second wastewater collection tank 64 through the second wastewater pipe.

[0050] In an exemplary embodiment of the present disclosure, the chemical backwash pump 7 is in communication connection with the backwash water pump 61; wherein the relationship between the flow rate Q1 of the backwash water pump 61 when the chemical backwash pump 7 is turned on and the flow rate Q2 of the backwash water pump 61 when the chemical backwash pump 7 is turned off satisfies 1 / 3≤Q1 / Q2≤2 / 3. For example, when chemical backwashing is performed, the flow rate in the backwash pipeline 62 is 1 / 2 of the flow rate in the backwash pipeline 62 when the chemical backwash pump 7 is not turned on.

[0051] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. An ultrafiltration membrane water treatment device, characterized in that: include: A water inlet main pipe (11), a water production main pipe (12), at least two ultrafiltration membrane modules (2), a main water inlet pump (31) and a main water inlet valve (41); the water inlet end of the water inlet main pipe (11) is connected to the water inlet of the ultrafiltration membrane water treatment device, the water inlets (21) of each of the ultrafiltration membrane modules (2) are communicated with the water inlet main pipe (11) via a water inlet branch (51), the water outlets (22) of each of the ultrafiltration membrane modules (2) are communicated with the water production main pipe (12) via a water outlet branch (52), the water outlet end of the water production main pipe (12) is connected to the water production port of the ultrafiltration membrane water treatment device, and the main water inlet pump (31) and the main water inlet valve (41) are arranged on the water inlet main pipe (11); The water inlet main pipe (11) is provided with a temperature sensor and a signal distributor, the input end of the signal distributor is connected to the temperature sensor, the first output end of the signal distributor is connected to the main water inlet pump (31), and the second output end of the signal distributor is connected to the main water inlet valve (41), so that the temperature sensor is connected to the main water inlet pump (31) in communication, and the temperature sensor is connected to the main water inlet valve (41) in communication; the motor frequency of the main water inlet pump (31) is adjustable according to the return amount of the temperature sensor, and the opening of the main water inlet valve (41) is adjustable according to the return amount of the temperature sensor; the signal distributor is fixedly connected to the water inlet main pipe (11) by a clamp-type bracket; the temperature sensor is an embedded pipe wall temperature probe, and the detection surface of the temperature sensor forms an angle of 30°-60° with the water flow direction in the water inlet main pipe (11).

2. The ultrafiltration membrane water treatment device according to claim 1, characterized in that: The main water inlet pump (31) is arranged upstream of the main water inlet valve (41), and the ultrafiltration membrane water treatment device further comprises a first turbidity meter; the first turbidity meter is arranged on the main water inlet pipe (11), and the first turbidity meter is arranged upstream of the main water inlet pump (31).

3. The ultrafiltration membrane water treatment device according to claim 2, characterized in that: The ultrafiltration membrane water treatment device further comprises a total water production valve (42) and a second turbidity meter, wherein the total water production valve (42) is arranged on the total water production pipe (12); the second turbidity meter is arranged on the total water production pipe (12), and the second turbidity meter is arranged downstream of the total water production valve (42).

4. The ultrafiltration membrane water treatment device according to claim 3, characterized in that: The ultrafiltration membrane water treatment device also includes a turbidity calculation module, which is communicatively connected to the first turbidity meter and the second turbidity meter, and is used to obtain the return amount of the first turbidity meter and the second turbidity meter. The turbidity calculation module is also communicatively connected to the total water inlet pump (31), and the motor frequency of the total water inlet pump (31) can be adjusted according to the input of the turbidity calculation module.

5. The ultrafiltration membrane water treatment device according to claim 1, characterized in that: The ultrafiltration membrane water treatment device further comprises: a first pressure transmitter, which is arranged on the water inlet main pipe (11); and at least two second pressure transmitters, which are respectively arranged on the water inlet branch pipes (51).

6. The ultrafiltration membrane water treatment device according to claim 1, characterized in that: The ultrafiltration membrane water treatment device further comprises a backwashing water tank (6) and a backwashing water pump (61); the water inlet end of the backwashing water tank (6) is connected to the water production main pipe (12); the water outlet end of the backwashing water tank (6) is connected to the water outlet (22) of the ultrafiltration membrane assembly (2) via a backwashing pipeline (62); the water inlet (21) of the ultrafiltration membrane assembly (2) is also connected to a first wastewater collection tank (63) via a first wastewater pipe; the backwashing water pump (61) is arranged on the backwashing pipeline (62); wherein the motor frequency of the backwashing water pump (61) is adjustable.

7. The ultrafiltration membrane water treatment device according to claim 6, characterized in that: The ultrafiltration membrane water treatment device further comprises: a third pressure transmitter, which is arranged in the backwash pipeline (62).

8. The ultrafiltration membrane water treatment device according to claim 6, characterized in that: The ultrafiltration membrane water treatment device further comprises a chemical backwashing tank and a chemical backwashing pump (7); the chemical backwashing tank is connected to the backwashing pipeline (62) via a chemical backwashing pipeline; the chemical backwashing pump (7) is arranged in the chemical backwashing pipeline; a first pH sensor is arranged in the chemical backwashing tank; the first pH sensor is communicatively connected to the chemical backwashing pump (7); wherein the motor frequency of the chemical backwashing pump (7) can be adjusted according to the return amount of the first pH sensor.

9. The ultrafiltration membrane water treatment device according to claim 8, characterized in that: The water inlet main pipe (11) is provided with a second pH sensor, the second pH sensor is in communication connection with the chemical backwash pump (7), and the motor frequency of the chemical backwash pump (7) is adjustably set according to the return amount of the second pH sensor; The ultrafiltration membrane water treatment device further comprises a chemical cleaning tank and a chemical cleaning pump (8); the chemical cleaning tank is connected to the water inlet (21) of the ultrafiltration membrane assembly (2) via a chemical cleaning pipeline; the chemical cleaning pump (8) is arranged on the chemical cleaning pipeline; the ultrafiltration membrane assembly (2) has a drain outlet (23) adjacent to the water outlet (22); the drain outlet (23) is connected to a pharmaceutical wastewater pool.

10. The ultrafiltration membrane water treatment device according to claim 8, characterized in that: The chemical backwash pump (7) is communicatively connected to the backwash water pump (61); wherein a relationship between a flow rate Q1 of the backwash water pump (61) when the chemical backwash pump (7) is turned on and a flow rate Q2 of the backwash water pump (61) when the chemical backwash pump (7) is turned off satisfies 1 / 3≤Q1 / Q2≤2 / 3.

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