Device applied to offline cleaning of nanofiltration and reverse osmosis membrane

Abstract

The utility model belongs to the technical field of membrane cleaning, and particularly relates to a device applied to offline cleaning of nanofiltration and reverse osmosis membranes, which comprises a cleaning component and a membrane shell component, and the membrane shell component comprises a plurality of membrane shells, a second forward washing water inlet valve and a second backwashing water inlet valve; a second forward washing water inlet valve is arranged at one end, close to the cleaning assembly, of each membrane shell, and a second backwashing water inlet valve is arranged at one end, away from the cleaning assembly, of each membrane shell; a first washing water inlet valve and a first backwashing water inlet valve are arranged between the cleaning assembly and the membrane shell assembly, the other end of the first backwashing water inlet valve is communicated with the cleaning assembly, and the other end of the first washing water inlet valve is respectively communicated with the second washing water inlet valve and the cleaning assembly; according to the utility model, the first washing water inlet valve and the first backwashing water inlet valve are arranged, so that the cleaning liquid medicine can enter the membrane shell from two reverse directions to clean pollutants, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane cleaning, and in particular relates to a device used for off-line cleaning of nanofiltration and reverse osmosis membranes. Background Art

[0002] Whether domestic waste is buried in a landfill or incinerated in a waste incineration power plant, the treatment of leachate is a difficult problem. Currently, the end of leachate treatment is mostly nanofiltration and reverse osmosis. Due to the complex composition of leachate, high COD, high salt, heavy metals, and high hardness, the membrane is polluted and blocked quickly. It is usually difficult to restore the performance of nanofiltration and reverse osmosis membranes through online cleaning, especially for membranes that are severely polluted. Cross-contamination will occur during online cleaning, causing the membrane with less pollution at the end to be polluted twice.

[0003] When nanofiltration and reverse osmosis are running online, the pollution at the water inlet is often more serious than that at the water outlet, and the pollution in the second stage is more serious than that in the first stage, depending on the direction of water flow. Therefore, offline cleaning often only requires cleaning a few or two membrane elements at the water inlet. During online cleaning, pollutants in the membrane element channel may be hooked or adsorbed in the membrane roll, and unidirectional flushing cannot remove the pollutants. Utility Model Content

[0004] The purpose of the utility model is to provide a device for offline cleaning of nanofiltration and reverse osmosis membranes, so as to solve the technical problem that online cleaning in one direction cannot effectively remove pollutants by flushing the membrane elements, and to achieve the purpose of online cleaning by flushing the membrane elements in both forward and backwash directions to better flush out pollutants.

[0005] In order to solve the above technical problems, the utility model provides a device for offline cleaning of nanofiltration and reverse osmosis membranes, comprising: a cleaning component and a membrane shell component, wherein the output end of the cleaning component is connected to the input end of the membrane shell component;

[0006] The membrane shell assembly is provided in plurality, and the plurality of membrane shell assemblies are arranged in parallel, and the plurality of membrane shell assemblies are connected to each other; the membrane shell assembly includes a plurality of membrane shells, a second forward wash water inlet valve and a second backwash water inlet valve, and the plurality of membrane shells are arranged in parallel; the second forward wash water inlet valve is provided at one end of each membrane shell close to the cleaning assembly, and the second backwash water inlet valve is provided at one end of each membrane shell away from the cleaning assembly;

[0007] A first forward wash inlet valve and a first backwash inlet valve are provided between the cleaning assembly and the membrane housing assembly, the other end of the first backwash inlet valve is communicated with the cleaning assembly, and the other end of the first forward wash inlet valve is communicated with the second forward wash inlet valve and the cleaning assembly respectively;

[0008] A first forward wash outlet valve is provided between the first backwash inlet valve and the cleaning assembly, and a first backwash outlet valve is provided between the first forward wash inlet valve and the cleaning assembly. The first forward wash outlet valve is provided on the side of the membrane shell assembly close to the cleaning assembly, and the first backwash outlet valve is provided on the side of the membrane shell assembly away from the cleaning assembly.

[0009] Furthermore, the cleaning component includes: a cleaning water tank, a cleaning pump and a filter, and the cleaning component is sequentially provided with the cleaning pump and the filter along the water flow direction;

[0010] An emptying valve is provided at the bottom end of the cleaning water tank, a bypass valve is provided between the cleaning water tank and the cleaning pump, and the first forward wash outlet valve and the first backwash outlet valve are both connected to the top end of the cleaning water tank.

[0011] Furthermore, the cleaning pump is provided with an inlet rotor flowmeter and a return valve in sequence along the water flow direction. The inlet rotor flowmeter and the return valve are both provided between the cleaning pump and the filter. The other end of the return valve is connected to the top of the cleaning water tank.

[0012] Furthermore, an inlet valve and a first pressure gauge are sequentially provided on the side of the filter close to the cleaning water tank, the inlet valve is provided between the filter and the reflux valve, and the first pressure gauge is provided between the reflux valve and the water inlet rotor flowmeter.

[0013] Furthermore, a second pressure gauge and an outlet valve are sequentially provided on a side of the filter away from the cleaning water tank, and the second pressure gauge and the outlet valve are provided between the filter and the first backwash water inlet valve.

[0014] Furthermore, a forward wash pressure gauge is provided between the membrane housing and the second forward wash water inlet valve, a backwash pressure gauge is provided between the membrane housing and the second backwash water inlet valve, and the plurality of membrane housings are connected.

[0015] Furthermore, a produced water sampling valve, a produced water rotor flowmeter and a produced water valve are sequentially provided on one end of the membrane shell away from the cleaning component.

[0016] The beneficial effects of the utility model are:

[0017] 1. By setting the first forward wash inlet valve, the first forward wash outlet valve, the first backwash inlet valve and the first backwash outlet valve, open the first forward wash inlet valve and the first forward wash outlet valve, close the first backwash inlet valve and the first backwash outlet valve, and the cleaning pump will let the cleaning liquid in the cleaning water tank pass through the filter from the first forward wash inlet valve and the second forward wash inlet valve into the membrane shell in the positive direction to flush the pollutants in the membrane shell, and the waste water enters the cleaning water tank from the first forward wash outlet valve and is discharged through the emptying valve; open the first backwash inlet valve and the first backwash outlet valve, close the first forward wash inlet valve and the first backwash outlet valve, and the cleaning pump will let the cleaning liquid in the cleaning water tank pass through the filter from the first backwash inlet valve and the second backwash inlet valve into the membrane shell in the reverse direction to flush the pollutants in the membrane shell, and the waste water enters the cleaning water tank from the first backwash outlet valve and is discharged through the emptying valve; by flushing the membrane shell in the positive and negative directions, the pollutants are better cleaned, thereby improving the filtration efficiency of the membrane element.

[0018] 2. By separately setting a second forward wash water inlet valve and a second backwash water inlet valve before and after each membrane shell, the corresponding water inlet valve can be closed during forward wash or backwash to isolate any membrane shell. By observing the pressure gauge and flow meter separately set for each membrane shell, the cleaning status of each membrane shell can be observed, making the membrane element cleaning more thorough.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a device for off-line cleaning of nanofiltration and reverse osmosis membranes according to the present invention;

[0022] Figure 2 This is a structural diagram of the membrane shell assembly of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the cleaning component of the present utility model.

[0024] In the picture:

[0025] 1. Cleaning assembly; 11. Cleaning water tank; 111. Drain valve; 112. Bypass valve; 12. Cleaning pump; 121. Water inlet rotor flowmeter; 122. Return valve; 13. Filter; 131. Inlet valve; 132. Outlet valve; 133. First pressure gauge; 134. Second pressure gauge; 2. First forward wash inlet valve; 21. First forward wash outlet valve; 3. First backwash inlet valve; 31. First backwash outlet valve; 4. Membrane housing assembly; 41. Membrane housing; 42. Second forward wash inlet valve; 43. Second backwash inlet valve; 44. Forward wash pressure gauge; 45. Backwash pressure gauge; 46. Water production sampling valve; 47. Water production rotor flowmeter; 48. Water production valve. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] Example:

[0028] like Figures 1 to 3 As shown, a device for offline cleaning of nanofiltration and reverse osmosis membranes includes: a cleaning component 1 and a membrane shell component 4, and the output end of the cleaning component 1 is connected to the input end of the membrane shell component 4.

[0029] like Figure 2As shown, the membrane shell assembly 4 is provided with multiple, multiple membrane shell assemblies 4 are arranged in parallel, and multiple membrane shell assemblies 4 are connected; the membrane shell assembly 4 includes multiple membrane shells 41, a second forward wash water inlet valve 42 and a second backwash water inlet valve 43, and multiple membrane shells 41 are arranged in parallel; each membrane shell 41 is provided with a second forward wash water inlet valve 42 at one end close to the cleaning assembly 1, and a second backwash water inlet valve 43 at one end of each membrane shell 41 away from the cleaning assembly 1; when the cleaning agent in the cleaning assembly 1 enters the membrane shell 41 from the second forward wash water inlet valve 42, the membrane shell 41 is cleaned and flushed from the forward direction, and when the cleaning agent enters the membrane shell 41 from the second backwash water inlet valve 43, the membrane is flushed from the reverse direction. The membrane shell 41 is cleaned and flushed, and the pollutants in the membrane shell 41 are better cleaned by flushing in two directions. A forward washing pressure gauge 44 is provided between the membrane shell 41 and the second forward washing water inlet valve 42, and a backwash pressure gauge 45 is provided between the membrane shell 41 and the second backwash water inlet valve 43. The multiple membrane shells 41 are connected; a water production sampling valve 46, a water production rotor flowmeter 47 and a water production valve 48 are also provided in sequence at the end of the membrane shell 41 away from the cleaning component 1; by observing and recording the forward washing pressure gauge 44, the backwash pressure gauge 45 and the water production rotor flowmeter 47 of each membrane shell 41, the pressure and water production flow rate at both ends of the membrane shell 41 are obtained, and the cleaning condition is judged according to the change in pressure difference and water production flow rate.

[0030] In this embodiment, a first forward wash inlet valve 2 and a first backwash inlet valve 3 are provided between the cleaning component 1 and the membrane shell component 4. The other end of the first backwash inlet valve 3 is connected to the cleaning component 1, and the other end of the first forward wash inlet valve 2 is connected to the second forward wash inlet valve 42 and the cleaning component 1 respectively; a first forward wash outlet valve 21 is provided between the first backwash inlet valve 3 and the cleaning component 1, and a first backwash outlet valve 31 is provided between the first forward wash inlet valve 2 and the cleaning component 1. The first forward wash outlet valve 21 is provided on the side of the membrane shell component 4 close to the cleaning component 1, and the first backwash outlet valve 31 is provided On the side of the membrane shell assembly 4 away from the cleaning assembly 1; open the first forward wash inlet valve 2 and the first forward wash outlet valve 21, close the first backwash inlet valve 3 and the first backwash outlet valve 31, and the cleaning liquid enters the membrane shell 41 in the positive direction from the first forward wash inlet valve 2 to clean pollutants, and the waste water is discharged from the first forward wash outlet valve 21; open the first backwash inlet valve 3 and the first backwash outlet valve 31, close the first forward wash inlet valve 2 and the first forward wash outlet valve 21, and the cleaning liquid enters the membrane shell 41 in the reverse direction from the first backwash inlet valve 3 to clean pollutants, and the waste water is discharged from the first backwash outlet valve 31.

[0031] like Figure 3As shown, the cleaning component 1 includes: a cleaning water tank 11, a cleaning pump 12 and a filter 13. The cleaning component 1 is sequentially provided with a cleaning pump 12 and a filter 13 along the water flow direction; an emptying valve 111 is provided at the bottom of the cleaning water tank 11, and a bypass valve 112 is provided between the cleaning water tank 11 and the cleaning pump 12. The first forward wash outlet valve 21 and the first backwash outlet valve 31 are both connected to the top of the cleaning water tank 11; the waste liquid after forward wash and backwash enters the cleaning water tank 11 and is discharged from the emptying valve 111; the cleaning pump 12 is sequentially provided with a water inlet rotor flowmeter 121 and a return valve 122 along the water flow direction, and the water inlet rotor flowmeter 121 and the return valve 122 are both provided between the cleaning pump 12 and the filter 13, and the other end of the return valve 122 is connected to the top of the cleaning water tank 11; the filter 13 is sequentially provided with an inlet valve on the side close to the cleaning water tank 11 131 and a first pressure gauge 133, the inlet valve 131 is arranged between the filter 13 and the return valve 122, and the first pressure gauge 133 is arranged between the return valve 122 and the water inlet rotor flowmeter 121; a second pressure gauge 134 and an outlet valve 132 are sequentially arranged on the side of the filter 13 away from the cleaning water tank 11, and the second pressure gauge 134 and the outlet valve 132 are arranged between the filter 13 and the first backwash inlet valve 3; during forward washing, the cleaning pump 12 will allow the cleaning liquid in the cleaning water tank 11 to pass through the filter 13 from the first forward wash inlet valve 2 and the second forward wash inlet valve 42 into the membrane shell 41 in the forward direction to flush the pollutants in the membrane shell 41; during backwashing, the cleaning pump 12 will allow the cleaning liquid in the cleaning water tank 11 to pass through the filter 13 from the first backwash inlet valve 3 and the second backwash inlet valve 43 into the membrane shell 41 in the reverse direction to flush the pollutants in the membrane shell 41.

[0032] In summary, during forward washing, the first forward washing inlet valve 2 and the first forward washing outlet valve 21 are opened, and the first backwash inlet valve 3 and the first backwash outlet valve 31 are closed. The cleaning pump 12 draws the cleaning liquid in the cleaning water tank 11 through the filter 13 from the first forward washing inlet valve 2 and the second forward washing inlet valve 42 into the membrane shell 41 in the positive direction to flush the pollutants in the membrane shell 41. The waste water enters the cleaning water tank 11 from the first forward washing outlet valve 21 and is discharged through the drain valve 111. During backwashing, the first backwash inlet valve 3 and the first backwash outlet valve 3 are opened. The backwash outlet valve 31 closes the first forward wash inlet valve 2 and the first forward wash outlet valve 21. The cleaning pump 12 allows the cleaning liquid in the cleaning water tank 11 to enter the membrane shell 41 through the filter 13 from the first backwash inlet valve 3 and the second backwash inlet valve 43 to flush the pollutants in the membrane shell 41 in the reverse direction. The wastewater enters the cleaning water tank 11 from the first backwash outlet valve 31 and is discharged through the drain valve 111. By flushing the membrane shell 41 in the forward and reverse directions, the pollutants are better cleaned, thereby improving the filtration efficiency of the membrane element.

[0033] The various devices selected in this application are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0034] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for offline cleaning of nanofiltration and reverse osmosis membranes, characterized in that: include: A cleaning component (1) and a membrane shell component (4), wherein the output end of the cleaning component (1) is connected to the input end of the membrane shell component (4); The membrane shell assembly (4) is provided in plurality, and the plurality of membrane shell assemblies (4) are arranged in parallel, and the plurality of membrane shell assemblies (4) are connected to each other; the membrane shell assembly (4) comprises a plurality of membrane shells (41), a second forward wash water inlet valve (42) and a second backwash water inlet valve (43), and the plurality of membrane shells (41) are arranged in parallel; the second forward wash water inlet valve (42) is provided at one end of each membrane shell (41) close to the cleaning assembly (1), and the second backwash water inlet valve (43) is provided at one end of each membrane shell (41) away from the cleaning assembly (1); A first forward wash water inlet valve (2) and a first backwash water inlet valve (3) are provided between the cleaning assembly (1) and the membrane shell assembly (4); the other end of the first backwash water inlet valve (3) is in communication with the cleaning assembly (1); and the other end of the first forward wash water inlet valve (2) is in communication with the second forward wash water inlet valve (42) and the cleaning assembly (1), respectively; A first forward wash outlet valve (21) is provided between the first backwash inlet valve (3) and the cleaning assembly (1), and a first backwash outlet valve (31) is provided between the first forward wash inlet valve (2) and the cleaning assembly (1). The first forward wash outlet valve (21) is provided on a side of the membrane shell assembly (4) close to the cleaning assembly (1), and the first backwash outlet valve (31) is provided on a side of the membrane shell assembly (4) away from the cleaning assembly (1).

2. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 1, characterized in that: The cleaning component (1) comprises: a cleaning water tank (11), a cleaning pump (12) and a filter (13); the cleaning component (1) is provided with the cleaning pump (12) and the filter (13) in sequence along the water flow direction; An emptying valve (111) is provided at the bottom end of the cleaning water tank (11), a bypass valve (112) is provided between the cleaning water tank (11) and the cleaning pump (12), and the first forward wash outlet valve (21) and the first backwash outlet valve (31) are both connected to the top end of the cleaning water tank (11).

3. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 2, characterized in that: The cleaning pump (12) is provided with a water inlet rotor flowmeter (121) and a return valve (122) in sequence along the water flow direction. The water inlet rotor flowmeter (121) and the return valve (122) are both provided between the cleaning pump (12) and the filter (13). The other end of the return valve (122) is communicated with the top end of the cleaning water tank (11).

4. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 3, characterized in that: An inlet valve (131) and a first pressure gauge (133) are sequentially provided on a side of the filter (13) close to the cleaning water tank (11); the inlet valve (131) is provided between the filter (13) and the return valve (122); and the first pressure gauge (133) is provided between the return valve (122) and the water inlet rotor flowmeter (121).

5. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 3, characterized in that: A second pressure gauge (134) and an outlet valve (132) are sequentially provided on a side of the filter (13) away from the cleaning water tank (11); the second pressure gauge (134) and the outlet valve (132) are provided between the filter (13) and the first backwash water inlet valve (3).

6. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 1, characterized in that: A forward wash pressure gauge (44) is provided between the membrane housing (41) and the second forward wash water inlet valve (42), a backwash pressure gauge (45) is provided between the membrane housing (41) and the second backwash water inlet valve (43), and the plurality of membrane housings (41) are connected to each other.

7. The device for offline cleaning of nanofiltration and reverse osmosis membranes according to claim 1, characterized in that: A produced water sampling valve (46), a produced water rotor flowmeter (47) and a produced water valve (48) are sequentially provided at one end of the membrane housing (41) away from the cleaning assembly (1).

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