Water treatment system

Abstract

This application relates to a water treatment system, including a membrane tank group, a permeate pump group, connecting pipelines, and a control device. The membrane tank group includes N membrane tanks; the permeate pump group includes S permeate pumps connected in parallel, where S < N; the connecting pipeline includes a main permeate pipe, an outlet pipe, and branch permeate pipes; the N branch permeate pipes are connected to the N membrane tanks respectively; the main permeate pipe is connected to the N branch permeate pipes and to the S permeate pumps; the outlet pipe is connected to the S permeate pumps; the control device includes a control unit and regulating valves, with N regulating valves correspondingly installed on the N branch permeate pipes; the control unit is electrically connected to the S permeate pumps and the N regulating valves; the water treatment system can operate in a first mode, in which the control unit controls the operation of M permeate pumps and controls the N regulating valves to open in batches, and adjusts the opening degree of each batch of regulating valves to keep the outlet flow rate of the outlet pipe at a first preset flow rate; each batch of regulating valves includes K regulating valves, where K < N and M < S.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a water treatment system. Background Technology

[0002] Membrane bioreactor (MBR) is a revolutionary new biological treatment technology that organically combines membrane separation technology with biotechnology. This technology uses membrane separation to replace secondary sedimentation tanks for solid-liquid separation, offering advantages that traditional biological treatment processes lack, such as simple process, high and stable effluent quality, small footprint, low civil engineering costs, and low sludge production. It is currently the most promising biological wastewater treatment technology in the field.

[0003] However, current membrane bioreactors still suffer from problems such as high equipment wear and tear, and high investment and operating costs. Utility Model Content

[0004] Based on this, this application provides a water treatment system that ensures the continuous and stable operation of the water treatment system while reducing equipment wear and tear, and lowering the investment and operating costs of the water treatment system.

[0005] A water treatment system, comprising:

[0006] A membrane tank group consists of N membrane tanks; N ≥ 3;

[0007] The water production pump set includes S water production pumps connected in parallel, where S < N and S ≥ 2;

[0008] The connecting pipeline includes a main water production pipe, an outlet pipe, and N branch water production pipes; the N branch water production pipes are connected to the N membrane tanks in a one-to-one correspondence; the main water production pipe is connected to the N branch water production pipes, and the main water production pipe is connected to S water production pumps; the outlet pipe is connected to the S water production pumps.

[0009] The control device includes a control unit and N regulating valves, with each of the N regulating valves corresponding to one of the N water production branch pipes; the control unit is electrically connected to the S water production pumps and the N regulating valves.

[0010] The water treatment system can operate in a first mode. In the first mode, the control unit is used to control the operation of M water pumps and control N regulating valves to open in batches, and adjust the opening degree of each batch of regulating valves so that the water flow rate of the outlet pipe is maintained at a first preset flow rate; wherein, each batch of regulating valves includes K regulating valves, K < N, M < S.

[0011] In one embodiment, the water treatment system can operate in a second mode. In the second mode, the control unit controls the operation of S water pumps and controls N regulating valves to open in batches, and adjusts the opening degree of each batch of regulating valves so that the water flow rate of the outlet pipe is maintained at a second preset flow rate, which is greater than the first preset flow rate; wherein each batch of regulating valves includes K regulating valves, where K < N.

[0012] In one embodiment, the water treatment system can operate in a third mode, in which the control unit controls the operation of F water pumps and controls N regulating valves to open in batches, and adjusts the opening degree of each batch of regulating valves so that the water flow rate of the outlet pipe is maintained at a third preset flow rate, which is less than the first preset flow rate; wherein each batch of regulating valves includes K regulating valves, K < N; F ≤ M, and at least one of the F water pumps is connected to a frequency converter, and the frequency converter is electrically connected to the control unit.

[0013] In one embodiment, the system further includes frequency converters, the number of which is (SM), the (SM) frequency converters are connected to (SM) water pumps, and the (SM) frequency converters are electrically connected to the control unit.

[0014] In one embodiment, a level gauge is also included, with each membrane tank equipped with a level gauge for monitoring the liquid level in the membrane tank; the level gauge is electrically connected to the control unit.

[0015] The control unit is used to control the operation of the water production pump group according to the liquid level and the first preset liquid level L1, the second preset liquid level L2 and the third preset liquid level L3.

[0016] When the liquid level is less than L1, the control unit controls all the product water pumps to shut down.

[0017] When L1 ≤ the liquid level < L2, the control unit controls F of the water pumps to operate, so that the water treatment system operates in the third mode;

[0018] When L2 ≤ the liquid level < L3, the control unit controls M of the water pumps to operate, so that the water treatment system operates in the first mode;

[0019] When the liquid level is ≥ L3, the control unit controls S of the water production pumps to operate, so that the water treatment system operates in the second mode.

[0020] In one embodiment, in the first mode, the control unit is further configured to adjust the opening of the K regulating valves to set the liquid level monitored by the level gauge in the K membrane tanks corresponding to the K regulating valves to a fourth liquid level, so that the water flow rate of the outlet pipe is maintained at a first preset flow rate.

[0021] In one embodiment, a first flow meter is also included, which is installed on each of the product water branch pipes. The first flow meter is used to monitor the flow rate of each of the product water branch pipes. The first flow meter is electrically connected to the control unit.

[0022] In the first mode, the control unit is also used to adjust the opening of the K regulating valves so that the flow rate monitored by the K first flow meters corresponding to the K regulating valves is at the first flow rate, so that the water flow rate of the outlet pipe is maintained at the first preset flow rate.

[0023] In one embodiment, the water production pump group further includes S connecting branch pipes, the S water production pumps are disposed on the S connecting branch pipes, the main water production pipe is connected to the S connecting branch pipes, and the outlet pipe is connected to the S connecting branch pipes.

[0024] A second flow meter is installed on the water outlet pipe, which is used to monitor the water flow rate of the water outlet pipe; the second flow meter is connected to the control unit.

[0025] In one embodiment, a backwash assembly is also included, the backwash assembly comprising a backwash main pipe, a backwash branch pipe, and a control valve; the backwash main pipe is connected to the outlet pipe;

[0026] The number of backwash branch pipes is equal to the number of membrane tanks, and the backwash branch pipes connect the corresponding membrane tanks to the backwash main pipe; each of the backwash branch pipes is equipped with a control valve.

[0027] The control valve is electrically connected to the control unit; the control unit is also used to control the opening and closing of the control valve.

[0028] In one embodiment, a backwash assembly is also included, the backwash assembly comprising a backwash main pipe, a backwash branch pipe, a control valve, and a backwash pump;

[0029] The backwash main pipe is connected to the product water main pipe via the backwash pump;

[0030] The number of backwash branch pipes is equal to the number of membrane tanks, and the backwash branch pipes connect the corresponding membrane tanks to the backwash main pipe; each of the backwash branch pipes is equipped with a control valve.

[0031] Both the control valve and the backwash pump are electrically connected to the control unit; the control unit is also used to control the opening and closing of the backwash pump and the control valve.

[0032] In one embodiment, a monitor is also included, with each of the water pumps equipped with a monitor, the monitor being electrically connected to the control unit;

[0033] The monitor is used to monitor the vibration and temperature of the water production pump; the control unit is also used to control the start and stop of the water production pump according to the parameter information of the monitor.

[0034] The aforementioned water treatment system consists of a main permeate pipe and N branch permeate pipes connecting the membrane tank group and the permeate pump group. The outlet pipe connects to S permeate pumps in the permeate pump group. Each of the N branch permeate pipes is equipped with a regulating valve. The control unit is electrically connected to the S permeate pumps and the N regulating valves. The number of permeate pumps in the permeate pump group is less than the number of membrane tanks in the membrane tank group. When the water treatment system operates in the first mode, the control unit controls the operation of M permeate pumps and controls the N regulating valves to open in batches, adjusting the opening degree of each batch of regulating valves to maintain the outlet flow rate at a first preset flow rate. Each batch of regulating valves includes K regulating valves, where K < N and M < S. In other words, in the first mode, the control unit controls the N regulating valves to open in batches to achieve the desired flow rate for the N membranes. The membrane tank filters water in batches, and M water-producing pumps operate continuously. This avoids repeated start-stop cycles of the pumps, reducing pump wear and tear, and lowering maintenance costs for the pump group. This, in turn, reduces equipment wear and electrical costs in the water treatment system. Furthermore, since the number of water-producing pumps is less than the number of membrane tanks, in the first mode, with M pumps operating continuously (M < S), meaning only some pumps operate while the remaining pumps are on standby, this reduces investment costs and power consumption, thus lowering the overall investment and operating costs of the water treatment system. Moreover, if a pump operating in the first mode fails, the remaining pumps can be activated, ensuring the continuous and stable operation of the water treatment system. In summary, this application ensures the continuous and stable operation of the water treatment system while reducing equipment wear and tear, and lowering investment and operating costs. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a water treatment system provided in an embodiment of this application.

[0036] Figure 2 This is a schematic diagram of the structure of a water treatment system provided in another embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Water treatment system; 11. Membrane tank assembly; 11a. Membrane tank; 12. Permeate pump assembly; 121. Permeate pump; 122. Connecting branch pipe; 13. Connecting pipeline; 131. Permeate main pipe; 132. Outlet pipe; 133. Permeate branch pipe; 141. Regulating valve; 15. Level gauge; 16. First flow meter; 17. Second flow meter; 18. Backwash assembly; 181. Backwash main pipe; 182. Backwash branch pipe; 183. Control valve; 184. Backwash pump. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] Figure 1 A schematic diagram of the structure of a water treatment system according to an embodiment of this application is shown; Figure 2 A schematic diagram of the structure of a water treatment system provided in another embodiment of this application is shown.

[0046] See Figures 1 to 2An embodiment of this application provides a water treatment system 10, including a membrane tank group 11, a permeate pump group 12, a connecting pipeline 13, and a control device. The membrane tank group 11 includes N membrane tanks 11a; N≥3; the permeate pump group 12 includes S permeate pumps 121 connected in parallel, S<N, S≥2; the connecting pipeline 13 includes a main permeate pipe 131, an outlet pipe 132, and N branch permeate pipes 133; the N branch permeate pipes 133 are connected one-to-one with the N membrane tanks 11a; the main permeate pipe 131 is connected to the N branch permeate pipes 133, and the main permeate pipe 131 is also connected to the S permeate pumps 121; the outlet pipe 132 is connected to the S permeate pumps 121. The connection and control device includes a control unit (not shown) and N regulating valves 141, which are respectively installed on N water production branch pipes 133. The control unit is electrically connected to S water production pumps 121 and N regulating valves 141. The water treatment system 10 can operate in a first mode. In the first mode, the control unit is used to control the operation of M water production pumps 121 and control the N regulating valves 141 to open in batches, and adjust the opening degree of each batch of regulating valves 141 so that the water flow rate of the outlet pipe 132 is maintained at a first preset flow rate. Each batch of regulating valves 141 includes K regulating valves 141, where K < N and M < S.

[0047] In related technologies, membrane bioreactors (MBRs) have a one-to-one correspondence between membrane tanks and permeate pumps. However, the permeate production of each membrane tank is intermittent; after a period of production, the tank stops and enters a physical flushing phase involving aeration. This intermittent operation of the permeate pumps leads to repeated start-stop cycles, resulting in significant pump wear and tear and high maintenance costs for the MBR. Furthermore, the one-to-one correspondence between permeate pumps and membrane tanks results in a large number of pumps, leading to high power consumption and further increasing the operating costs. Additionally, to meet peak daily water treatment demands, each permeate pump requires high flow rates and power, and each is equipped with a frequency converter, significantly increasing the investment cost of the MBR. These factors combined result in high equipment wear and tear, high operating costs, and other problems associated with MBRs. In this application, in the first mode, the control unit controls N regulating valves 141 to open in batches to achieve batch filtration and water production in N membrane tanks 11a, and M water production pumps 121 operate continuously. On the one hand, this avoids the repeated start-stop of water production pumps 121 caused by intermittent water production in membrane tanks 11a, reducing the wear and tear of water production pumps 121 and the maintenance cost of water production pump group 12, thereby reducing the equipment wear and tear of water treatment system 10 and the electrical cost of water treatment system 10. On the other hand, since the number of water production pumps 121 is less than the number of membrane tanks 11a, in the first mode, M water production pumps 121 operate continuously, M < S, that is, in the first mode, some water production pumps 121 operate, and the remaining water production pumps 121 can be used as backups. This reduces the investment cost and power consumption of water production pumps 121, and reduces the investment and operating cost of water treatment system 10.

[0048] In summary, the water treatment system 10 provided in this application embodiment connects the membrane tank group 11 and the permeate pump group 12 via a main permeate pipe 131 and N branch permeate pipes 133. The outlet pipe 132 connects to the S permeate pumps 121 in the permeate pump group 12. Each of the N branch permeate pipes 133 is equipped with a regulating valve 141. The control unit is electrically connected to the S permeate pumps 121 and the N regulating valves 141. The number of permeate pumps 121 in the permeate pump group 12 is less than the number of membrane tanks 11a in the membrane tank group 11. When the water treatment system 10 operates in the first mode, the control unit controls the operation of M permeate pumps 121 and controls the N regulating valves 141 to open in batches, adjusting the opening degree of each batch of regulating valves 141 to maintain the outlet flow rate of the outlet pipe 132 at a first preset flow rate. Each batch of regulating valves 141 includes K regulating valves 141, where K < N and M < S. In other words, in the first mode, the control unit controls the N regulating valves 141 to operate. The valve 141 is opened in batches to achieve batch filtration and water production in N membrane tanks 11a, while M water production pumps 121 operate continuously. This avoids repeated start-stop of the water production pumps 121, reducing their wear and tear and maintenance costs, thereby reducing equipment wear and electrical costs in the water treatment system 10. Furthermore, since the number of water production pumps 121 is less than the number of membrane tanks 11a, in the first mode, M water production pumps 121 operate continuously (M < S), meaning that some water production pumps 121 operate while the remaining pumps are on standby. This reduces investment costs and power consumption of the water production pumps 121, lowering the investment and operating costs of the water treatment system 10. Moreover, if a water production pump 121 operating in the first mode fails, the remaining pumps can be started, ensuring the continuous and stable operation of the water treatment system 10. In summary, this application can ensure the continuous and stable operation of the water treatment system 10 while reducing equipment wear and tear, and lowering the investment and operating costs of the water treatment system 10.

[0049] It should be noted that the membrane tank 11a is equipped with multiple membrane modules, an aeration system, etc., and the multiple membrane modules are connected in parallel. The membrane modules are used to perform solid-liquid separation on the wastewater entering the membrane tank 11a.

[0050] In one embodiment, the water treatment system 10 can operate in a second mode. In the second mode, the control unit controls the operation of S water pumps 121 and controls N regulating valves 141 to open in batches, and adjusts the opening degree of each batch of regulating valves 141 so that the water flow rate of the outlet pipe 132 is maintained at a second preset flow rate, which is greater than a first preset flow rate. Each batch of regulating valves 141 includes K regulating valves 141, where K < N.

[0051] In this way, by controlling the operation of S water pumps 121 by the control unit and controlling the opening of N regulating valves 141 in batches, and adjusting the opening degree of each batch of regulating valves 141, the water flow rate of the outlet pipe 132 is kept at the second preset flow rate, which is greater than the first preset flow rate. This means that the water treatment system 10 can meet the high flow rate treatment requirements. In this way, the application scope and application scenarios of the water treatment system 10 can be broadened, which is conducive to the promotion and application of the water treatment system 10.

[0052] Understandably, the water treatment system 10 typically includes daily treatment needs and peak treatment needs. The daily treatment needs correspond to a smaller outflow rate from the outlet pipe 132, while the peak treatment needs correspond to a larger outflow rate from the outlet pipe 132. The first mode can refer to the operating mode in which the water treatment system 10 can meet the daily treatment needs, and the first preset flow rate can refer to the outflow rate from the outlet pipe 132 per unit time during the daily treatment period. The second mode can refer to the operating mode in which the water treatment system 10 can meet the peak treatment needs, and the second preset flow rate can refer to the outflow rate from the outlet pipe 132 per unit time during the peak treatment period.

[0053] In one embodiment, the water treatment system 10 further includes frequency converters (not shown), the number of which is SM, the SM frequency converters are connected to the SM water pumps 121, and the SM frequency converters are electrically connected to the control unit.

[0054] Thus, by setting a frequency converter, the flow rate of the (SM) individual water pump 121 can be easily adjusted, thereby facilitating the control of the water flow rate of the water outlet pipe 132 of the water treatment system 10 in the second mode, so that the water flow rate of the water outlet pipe 132 is maintained at the second preset flow rate, enabling the water treatment system 10 to meet the high flow rate treatment requirements.

[0055] In one embodiment, the water treatment system 10 can operate in a third mode. In the third mode, the control unit controls the operation of F water pumps 121 and controls N regulating valves 141 to open in batches, and adjusts the opening degree of each batch of regulating valves 141 so that the water flow rate of the outlet pipe 132 is maintained at a third preset flow rate, which is less than a first preset flow rate. Each batch of regulating valves 141 includes K regulating valves, where K < N and F ≤ M. At least one of the F water pumps 121 is connected to a frequency converter, and the frequency converter is electrically connected to the control unit.

[0056] Thus, the control unit controls the operation of F water pumps 121 and controls N regulating valves 141 to open in batches, adjusting the opening degree of each batch of regulating valves 141 to keep the water flow rate of the outlet pipe 132 at a third preset flow rate, which is less than the first preset flow rate; F≤M, at least one of the F water pumps 121 is connected to a frequency converter, and the frequency converter is electrically connected to the control unit; that is, by using at least a portion of the M water pumps in conjunction with the frequency converter, the water treatment system 10 can meet the needs of smaller flow rates, thus broadening the application scope and scenarios of the water treatment system 10 and facilitating its promotion and application.

[0057] In one embodiment, see [reference] Figure 1 and Figure 2 The water treatment system 10 also includes a level gauge 15. Each membrane tank 11a is equipped with a level gauge 15, which is used to monitor the liquid level in the membrane tank 11a. The level gauge 15 is electrically connected to the control unit. The control unit is used to control the operation of the permeate pump group 12 according to the liquid level of the membrane tank 11a and the first preset liquid level L1, the second preset liquid level L2 and the third preset liquid level L3. When the liquid level of the membrane tank 11a is less than L1, the control unit controls all permeate pumps 121 to shut down. When L1 ≤ the liquid level of the membrane tank 11a is less than L2, the control unit controls F permeate pumps 121 to operate, so that the water treatment system 10 operates in the third mode. When L1 ≤ the liquid level of the membrane tank 11a is less than L2, the control unit controls M permeate pumps 121 to operate, so that the water treatment system 10 operates in the first mode. When the liquid level of the membrane tank 11a is greater than or equal to L3, the control unit controls S permeate pumps 121 to operate, so that the water treatment system 10 operates in the second mode.

[0058] Thus, by installing a level gauge 15 in each membrane tank 11a, the liquid level in the membrane tank 11a can be monitored in real time. The control unit can then control the operation of the permeate pump group 12 based on the liquid level in the membrane tank 11a monitored by the level gauge 15. This avoids the water treatment system 10 from operating when the liquid level in the membrane tank 11a is too low. It allows the water treatment system 10 to switch between the first, second, and third modes based on the liquid level in the membrane tank 11a, ensuring the safe and stable operation of the water treatment system 10 and improving its water treatment efficiency.

[0059] In one embodiment, in the first mode, the control unit is also used to adjust the opening of K regulating valves 141 to keep the liquid level monitored by the level gauge 15 in the K membrane tanks 11a corresponding to the K regulating valves 141 at the fourth liquid level, so that the water flow rate of the outlet pipe 132 is maintained at the first preset flow rate.

[0060] Thus, by monitoring the liquid level of the K membrane tanks 11a through the level gauge 15 to see if it is at the fourth liquid level, it can be confirmed whether the water flow rate of the outlet pipe 132 is maintained at the first preset flow rate. That is, by monitoring the liquid level through the level gauge 15 to see if it is at the fourth liquid level, it can be confirmed whether the water treatment system 10 is in the first mode. If the liquid level monitored by the level gauge 15 is not at the fourth liquid level, the control unit can control the opening of the regulating valve 141 so that the liquid level monitored by the level gauge 15 is at the fourth liquid level and the water flow rate of the outlet pipe 132 is maintained at the first preset flow rate. In this way, the water treatment system 10 can be guaranteed to operate safely and stably in the first mode.

[0061] In one embodiment, see [reference] Figure 1 and Figure 2 The water treatment system 10 also includes a first flow meter 16, which is installed on each water production branch pipe 133. The first flow meter 16 is used to monitor the flow rate of each water production branch pipe 133. The first flow meter 16 is electrically connected to the control unit. In the first mode, the control unit is also used to adjust the opening of K regulating valves 141 to keep the flow rate monitored by the K first flow meters 16 corresponding to the K regulating valves 141 at the first flow rate, so that the water flow rate of the outlet pipe 132 is kept at the first preset flow rate.

[0062] Thus, by monitoring the flow rate of the K water production branch pipes 133 through the first flow meter 16, it can be confirmed whether the water flow rate of the outlet pipe 132 is maintained at the first preset flow rate. In other words, by monitoring the flow rate through the first flow meter 16, it can be confirmed whether the water treatment system 10 is in the first mode. If the flow rate monitored by the first flow meter 16 is not at the first flow rate, the control unit can control the opening of the regulating valve 141 so that the flow rate monitored by the first flow meter 16 is at the first flow rate and the water flow rate of the outlet pipe 132 is maintained at the first preset flow rate. In this way, the water treatment system 10 can be guaranteed to operate safely and stably in the first mode.

[0063] In one embodiment, see [reference] Figure 1 and Figure 2 The water production pump set 12 also includes S connecting branch pipes 122, S water production pumps 121 are installed on the S connecting branch pipes 122, the main water production pipe 131 is connected to the S connecting branch pipes 122, and the outlet pipe 132 is connected to the S connecting branch pipes 122; a second flow meter 17 is installed on the outlet pipe 132, and the second flow meter 17 is used to monitor the water flow rate of the outlet pipe 132; the second flow meter 17 is electrically connected to the control unit.

[0064] Thus, by setting up S connecting branch pipes 122, the fixed installation of S water production pumps 121 can be facilitated, so as to connect the water production pump group 12 with the main water production pipe 131 and the outlet pipe 132; by setting up a second flow meter 17 on the outlet pipe 132, the water flow rate of the outlet pipe 132 can be monitored. The control unit can adjust the opening of the regulating valve 141 according to the water flow rate monitored by the first flow meter 17 to ensure that the water flow rate is maintained at the first preset flow rate, the second preset flow rate or the third preset flow rate, thereby ensuring that the water treatment system operates stably in the first mode, the second mode or the third mode.

[0065] It should be noted that the S connecting branch pipes 122 and the main water production pipe 131 can be connected by multiple T-shaped pipes; the S connecting branch pipes 122 and the outlet pipe 132 can be connected by multiple T-shaped pipes. In this way, it is convenient to connect the main water production pipe 131 with the S connecting branch pipes 122, and to connect the outlet pipe 132 with the S connecting branch pipes 122.

[0066] In one embodiment, see [reference] Figure 1 The water treatment system 10 also includes a backwash assembly 18, which includes a backwash main pipe 181, backwash branch pipes 182, and a control valve 183. The backwash main pipe 181 is connected to the outlet pipe 132. The number of backwash branch pipes 182 is equal to that of the membrane tanks 11a, and the backwash branch pipes 182 are connected to the corresponding membrane tanks 11a and the backwash main pipe 181. A control valve 183 is provided on each backwash branch pipe 182. The control valve 183 is electrically connected to the control unit. The control unit is also used to control the opening and closing of the control valve 183.

[0067] Thus, when backwashing of membrane tank 11a is required, the control unit controls the corresponding control valve 183 to open, and the water in the outlet pipe 132 is sent to the membrane tank 11a that needs backwashing by using the pump pressure after the product water pump group 12. That is, the membrane tank 11a is backwashed by the water treated by the membrane tank 11a. In this way, there is no need to set up a water storage structure or a separate backwash pump 184, thereby reducing the footprint of the water treatment system 10 and reducing the investment and operating costs of the water treatment system 10.

[0068] In one embodiment, see [reference] Figure 2 The water treatment system 10 also includes a backwash assembly 18, which includes a backwash main pipe 181, backwash branch pipes 182, a control valve 183, and a backwash pump 184. The backwash main pipe 181 is connected to the product water main pipe 131 through the backwash pump 184. The number of backwash branch pipes 182 is equal to that of the membrane tanks 11a, and the backwash branch pipes 182 are connected to the corresponding membrane tanks 11a and the backwash main pipe 181. A control valve 183 is provided on each backwash branch pipe 182. The control valve 183 and the backwash pump 184 are both electrically connected to the control unit. The control unit is also used to control the opening and closing of the backwash pump 184 and the control valve 183.

[0069] Thus, when backwashing of membrane tank 11a is required, backwash pump 184 drives water in permeate main pipe 131 to be sent to backwash branch pipe 182 through backwash main pipe 181, and control unit controls the corresponding control valve 183 to open so that water in backwash branch pipe 182 enters the corresponding membrane tank 11a and membrane tank 11a is backwashed.

[0070] It should be noted that there can be multiple backwash pumps 184, which can be connected in parallel. The control unit controls N regulating valves 141 to open in batches, with each batch of regulating valves 141 including K regulating valves. That is, the control unit controls K membrane tanks 11a to filter the permeate water at a time. The maximum number of membrane tanks 11a that need to be backwashed is (NK). The multiple backwash pumps 184 only need to ensure the flow rate required for backwashing (NK) membrane tanks 11a. The specific number of backwash pumps 184 can be set according to actual needs, and the number of backwash pumps 184 does not have to be equal to the number of membrane tanks 11a.

[0071] In one embodiment, the water treatment system 10 further includes a monitor (not shown), which is installed on each water production pump 121 and is electrically connected to the control unit; the monitor is used to monitor the vibration and temperature of the water production pump 121; the control unit is also used to control the opening and closing of the water production pump 121 according to the parameter information of the monitor.

[0072] In this way, the operating status of the water production pump 121 can be monitored in real time through the monitor. The control unit can analyze and predict the operating status of the water production pump 121 based on the parameter information of the monitor. If the water production pump 121 malfunctions or other problems, the control unit can adjust the operating status of the water production pump 121 in a timely manner, that is, control the start and stop of the water production pump 121 to ensure the stable operation of the water production pump group 12 and improve the service life of the water production pump group 12.

[0073] In a specific example, the monitor includes a vibration sensor module, a temperature sensor module, a wireless communication module, and a battery. The vibration sensor module is used to monitor the vibration data of the water pump 121, the temperature sensor module is used to monitor the temperature data of the water pump 121, and the monitor communicates with the control unit through the wireless communication module.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A water treatment system, characterized in that, include: A membrane tank group consists of N membrane tanks; N≥3； The water production pump set includes S water production pumps connected in parallel, where S < N and S ≥ 2. The connecting pipeline includes a main water production pipe, an outlet pipe, and N branch water production pipes; the N branch water production pipes are connected to the N membrane tanks in a one-to-one correspondence; the main water production pipe is connected to the N branch water production pipes, and the main water production pipe is connected to S water production pumps; the outlet pipe is connected to the S water production pumps. The control device includes a control unit and N regulating valves, with each of the N regulating valves corresponding to one of the N water production branch pipes; the control unit is electrically connected to the S water production pumps and the N regulating valves. The water treatment system can operate in a first mode, in which the control unit... The unit is used to control the operation of M water pumps and to control N regulating valves to open in batches, and to adjust the opening degree of each batch of regulating valves so that the water flow rate of the outlet pipe is maintained at a first preset flow rate; wherein, each batch of regulating valves includes K regulating valves, K < N, M < S.

2. The water treatment system according to claim 1, characterized in that, The water treatment system can operate in the second mode. In the second mode, the control unit is used to control the operation of S water pumps and control N regulating valves to open in batches, and adjust the opening degree of each batch of regulating valves so that the water flow rate of the outlet pipe is maintained at a second preset flow rate, the second preset flow rate being greater than the first preset flow rate; wherein, each batch of regulating valves includes K regulating valves, K < N.

3. The water treatment system according to claim 2, characterized in that, The water treatment system can operate in a third mode. In this third mode, the control unit controls the operation of F water pumps and controls N regulating valves to open in batches, adjusting the opening degree of each batch of regulating valves to keep the water flow rate of the outlet pipe at a third preset flow rate, which is less than the first preset flow rate. Each batch of regulating valves includes K regulating valves, where K < N and F ≤ M. At least one of the F water pumps is connected to a frequency converter, and the frequency converter is electrically connected to the control unit.

4. The water treatment system according to claim 2, characterized in that, It also includes frequency converters, the number of which is (SM), the (SM) frequency converters are connected to the (SM) water pumps, and the (SM) frequency converters are electrically connected to the control unit.

5. The water treatment system according to claim 3, characterized in that, It also includes level gauges, Each of the membrane tanks is equipped with a level gauge for monitoring the liquid level in the membrane tank; the level gauge is electrically connected to the control unit. The control unit is used to control the operation of the water production pump group according to the liquid level and the first preset liquid level L1, the second preset liquid level L2 and the third preset liquid level L3. When the liquid level is less than L1, the control unit controls all the product water pumps to shut down. When L1 ≤ the liquid level < L2, the control unit controls F of the water pumps to operate, so that the water treatment system operates in the third mode; When L2 ≤ the liquid level < L3, the control unit controls M of the water pumps to operate, so that the water treatment system operates in the first mode; When the liquid level is ≥ L3, the control unit controls S of the water production pumps to operate, so that the water treatment system operates in the second mode.

6. The water treatment system according to claim 5, characterized in that, In the first mode, the control unit is also used to adjust the opening of the K regulating valves to set the liquid level monitored by the level gauge in the K membrane tanks corresponding to the K regulating valves to the fourth liquid level, so that the water flow rate of the outlet pipe is maintained at the first preset flow rate.

7. The water treatment system according to claim 1, characterized in that, It also includes a first flow meter, which is installed on each of the product water branch pipes. The first flow meter is used to monitor the flow rate of each of the product water branch pipes. The first flow meter is electrically connected to the control unit. In the first mode, the control unit is also used to adjust the opening of the K regulating valves so that the flow rate monitored by the K first flow meters corresponding to the K regulating valves is at the first flow rate, so that the water flow rate of the outlet pipe is maintained at the first preset flow rate.

8. The water treatment system according to any one of claims 1 to 7, characterized in that, The water production pump set also includes S connecting branch pipes, the S water production pumps are installed on the S connecting branch pipes, the main water production pipe is connected to the S connecting branch pipes, and the outlet pipe is connected to the S connecting branch pipes. A second flow meter is installed on the water outlet pipe, which is used to monitor the water flow rate of the water outlet pipe; the second flow meter is connected to the control unit.

9. The water treatment system according to any one of claims 1 to 7, characterized in that, It also includes a backwash assembly, which includes a backwash main pipe, a backwash branch pipe, and a control valve; the backwash main pipe is connected to the outlet pipe. The number of backwash branch pipes is equal to the number of membrane tanks, and the backwash branch pipes connect the corresponding membrane tanks to the backwash main pipe; each of the backwash branch pipes is equipped with a control valve. The control valve is electrically connected to the control unit; the control unit is also used to control the opening and closing of the control valve.

10. The water treatment system according to any one of claims 1 to 7, characterized in that, It also includes a backwash assembly, which includes a backwash main pipe, a backwash branch pipe, a control valve, and a backwash pump; The backwash main pipe is connected to the product water main pipe via the backwash pump; The number of backwash branch pipes is equal to the number of membrane tanks, and the backwash branch pipes connect the corresponding membrane tanks to the backwash main pipe; each of the backwash branch pipes is equipped with a control valve. Both the control valve and the backwash pump are electrically connected to the control unit; the control unit is also used to control the opening and closing of the backwash pump and the control valve.

11. The water treatment system according to any one of claims 1 to 7, characterized in that, It also includes a monitor, with each of the water pumps equipped with a monitor, which is electrically connected to the control unit; The monitor is used to monitor the vibration and temperature of the water production pump; the control unit is also used to control the start and stop of the water production pump according to the parameter information of the monitor.

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