Reverse osmosis membrane device for wastewater treatment of finishing machine

Abstract

The utility model discloses a reverse osmosis membrane device for treating wastewater of a finishing machine. Comprising a membrane module unit, a water inlet tank, a cleaning water tank, a water producing tank and a concentrated water tank, an outlet of the water inlet tank is sequentially connected with a water inlet pump, a booster pump and a circulating pump, an outlet of the circulating pump is connected with a water inlet of the membrane module unit, a water producing port of the membrane module unit is connected with the water producing tank, and a concentrated water port of the membrane module unit is connected with the concentrated water tank. A cleaning water inlet of the membrane assembly unit is connected with a cleaning pump and a dissolved air tank, the dissolved air tank is connected with a gas-liquid mixing pump, an outlet of a cleaning water tank is connected with the cleaning pump and the gas-liquid mixing pump, a membrane assembly in the membrane assembly unit comprises a membrane shell, a first end cover and a second end cover, and quick connectors are arranged in the middle of the membrane shell and at the two ends of the membrane shell to facilitate installation and maintenance of the membrane assembly. And the first end cover and the second end cover are provided with interfaces for chemical cleaning, so that cleaning and maintenance of the single membrane component can be realized. The device has the advantages of being convenient to disassemble, assemble and maintain, high in anti-pollution capacity, good in cleaning and recovery effect and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection sewage treatment, in particular to a reverse osmosis membrane device for waste water treatment of a skin pass mill. Background Art

[0002] The existing hot-dip galvanized skin pass mill often adopts a wet skin pass process. The waste water generated by the wet skin pass generally contains pollutants such as residual skin pass liquid, zinc powder, iron powder, machine oil and other impurities. Under the current trend of zero discharge and energy conservation and emission reduction, the reuse treatment of the waste water of the skin pass mill is a treatment method with great potential and economic benefits. At present, the reuse treatment of the waste water of the skin pass mill usually adopts "pretreatment + membrane treatment". The membrane treatment generally adopts ultrafiltration membrane and reverse osmosis membrane. For the waste water containing skin pass liquid, the reverse osmosis membrane is needed to separate the skin pass liquid in the waste water. Since the skin pass liquid contains surfactants, it is easy to cause irreversible pollution to the reverse osmosis membrane, resulting in a decrease in membrane flux and shortening the service life of the membrane. At the same time, after the treatment by the ultrafiltration membrane, there will still be a small amount of oil substances remaining in the ultrafiltration product water, which will also cause pollution to the reverse osmosis membrane. The existing reverse osmosis membranes mainly include spiral wound reverse osmosis and disk tube reverse osmosis. The disk tube reverse osmosis membrane has a high operating pressure and a high equipment cost, while the conventional spiral wound reverse osmosis membrane has poor fouling resistance. During the process of treating the waste water of the skin pass mill by the reverse osmosis membrane, it is difficult to recover the fouled membrane by conventional cleaning methods, and the membrane needs to be shut down during chemical cleaning, which affects the continuous operation of the waste water treatment of the skin pass mill. The conventional cleaning method adopts alkali cleaning and is a shutdown maintenance, and all the membrane modules are cleaned at one time. The waste alkali liquid after cleaning needs to be discharged. Since there are many membrane modules cleaned at one time, the required dosage of the medicine is large, and precise cleaning cannot be adopted. The utility model cleans a single membrane element or a single group of membrane elements, and the used medicine is less, which is beneficial to the use of special medicines for cleaning. For example, special organic solvents are used for cleaning, and the medicine can be used multiple times, avoiding the waste of the medicine and realizing precise cleaning. Summary of the Invention

[0003] The purpose of the utility model is to solve the problems in the current technology and provide a reverse osmosis membrane device for waste water treatment of a skin pass mill. The membrane module adopts a quick connector, which is convenient for disassembly and maintenance. Multiple membrane modules form a group, and a single group of membrane modules is isolated by closing the valve, which is convenient for the cleaning, maintenance or replacement of a single group of membrane modules. At the same time, air washing is adopted to strengthen the cleaning effect, and a single membrane module can be isolated and cleaned by closing the valve, so as to achieve the purpose of chemical cleaning during operation.

[0004] To achieve the above purpose, the technical solution of the utility model is:

[0005] A reverse osmosis membrane device for temper mill wastewater treatment, comprising a feed water tank. The outlet of the feed water tank is sequentially connected to a feed water main pipe through a feed water pump, a booster pump and a circulation pump. The feed water main pipe is communicated with the water inlet of a membrane module unit.

[0006] The water production outlets of the membrane module unit are respectively communicated with the corresponding water production pipes and the cleaning water production return pipes of the membrane module unit. The outlet of the water production pipe is connected to a product water tank, and the outlet of the cleaning water production return pipe is connected to the water inlet of a cleaning water tank. Valves are installed on both the water production pipe and the cleaning water production return pipe.

[0007] The concentrated water outlets of the membrane module unit are respectively communicated with the corresponding concentrated water return pipes, concentrated water outlet pipes and flushing discharge pipes of the membrane module unit. The outlet of the concentrated water return pipe is connected to the water inlet of the circulation pump. The concentrated water outlet pipe is connected to a concentrated water tank. The flushing discharge pipe is connected to an external sewage treatment system. Valves are installed on both the concentrated water outlet pipe and the flushing discharge pipe.

[0008] The cleaning water inlets of the membrane module unit are respectively connected to the outlets of a cleaning pump and a dissolved air tank through a cleaning water inlet pipe. The inlet of the dissolved air tank is connected to the outlet of a gas-liquid mixing pump. The outlet of the cleaning water tank is respectively connected to the inlet of the cleaning pump and the inlet of the gas-liquid mixing pump. The air inlet of the gas-liquid mixing pump is connected to external air.

[0009] The cleaning concentrated water outlets of the membrane module unit are connected to the water inlets of the cleaning water tank through a cleaning concentrated water return pipe.

[0010] As described above, the membrane module unit includes membrane modules.

[0011] The membrane module includes a cylindrical membrane housing. The two ends of the membrane housing are respectively detachably connected to a first end cover and a second end cover. The first end cover is provided with a first water production interface and a module cleaning concentrated water outlet. The second end cover is provided with a second water production interface and a module cleaning water inlet. Component water inlets and component concentrated water outlets are respectively arranged on the side walls of the membrane housing near both ends.

[0012] The component water inlet serves as the water inlet of the membrane module unit. The first water production interface or the second water production interface is the component water production outlet of the membrane module. The component water production outlet serves as the water production outlet of the membrane module unit. The component concentrated water outlet serves as the concentrated water outlet of the membrane module unit. The component cleaning water inlet serves as the cleaning water inlet of the membrane module unit. The component cleaning concentrated water outlet serves as the cleaning concentrated water outlet of the membrane module unit.

[0013] As described above, the membrane module unit includes a plurality of membrane modules connected in series.

[0014] The membrane module includes a cylindrical membrane housing. The two ends of the membrane housing are respectively detachably connected to a first end cover and a second end cover. The first end cover is provided with a first water production interface and a module cleaning concentrated water outlet. The second end cover is provided with a second water production interface and a module cleaning water inlet. Component water inlets and component concentrated water outlets are respectively arranged on the side walls of the membrane housing near both ends.

[0015] The component water inlet of the first membrane module serves as the water inlet of the membrane module unit; among the membrane modules other than the first one, the component water inlet of the current membrane module is connected to the component concentrated water outlet of the previous membrane module; the component concentrated water outlet of the last membrane module in the membrane module unit serves as the concentrated water outlet of the membrane module unit;

[0016] The first water production interface or the second water production interface of the membrane module is the component water production outlet, and the component water production outlets of the membrane modules in the membrane module unit are connected to the unit water production branch pipes, and the outlet of the unit water production branch pipe serves as the water production outlet of the membrane module unit;

[0017] The component cleaning water inlets of all the membrane modules in the membrane module unit are connected to the unit cleaning water inlet branch pipe, and the water inlet of the unit cleaning water inlet branch pipe serves as the cleaning water inlet of the membrane module unit;

[0018] The component cleaning concentrated water outlets of all the membrane modules in the membrane module unit are connected to the unit cleaning concentrated water branch pipe, and the outlet of the unit cleaning concentrated water branch pipe serves as the cleaning concentrated water outlet of the membrane module unit.

[0019] Multiple membrane module units as described above are connected in parallel,

[0020] The water inlets of each membrane module unit are connected to the water inlet main pipe through the unit water inlet branch pipes, and valves are installed on the unit water inlet branch pipes;

[0021] The concentrated water outlets of each membrane module unit are respectively communicated with the corresponding concentrated water return pipe, concentrated water outlet pipe and flushing discharge pipe of the membrane module unit through the unit concentrated water branch pipes, and valves are installed on the unit concentrated water branch pipes;

[0022] Isolation valves are installed on the unit water production branch pipes, unit cleaning water inlet branch pipes and unit cleaning concentrated water branch pipes;

[0023] The water production pipes of all the membrane module units are connected to the water production tank through the water production main pipe, and the cleaning water production return pipes of all the membrane module units are connected to the water inlet of the cleaning water tank through the cleaning water production return main pipe;

[0024] The concentrated water return pipes of all the membrane module units are connected to the water inlet of the circulation pump through the concentrated water return main pipe, the concentrated water outlet pipes of all the membrane module units are connected to the concentrated water tank through the concentrated water outlet main pipe, and the flushing discharge pipes of all the membrane module units are connected to the external sewage treatment system through the flushing discharge main pipe.

[0025] As described above, a first thrust ring, a membrane element, and a second thrust ring are sequentially installed inside the membrane housing along the central axis direction of the membrane housing. One end of the first water production interface passes through the first end cap and is connected to one end of the first adapter. The other end of the first adapter passes through the first thrust ring and is connected to one end of the water production channel of the membrane element. One end of the second water production interface passes through the second end cap and is connected to one end of the second adapter. The other end of the second adapter passes through the second thrust ring and is connected to the other end of the water production channel of the membrane element.

[0026] Both the first thrust ring and the second thrust ring are cylindrical or frustum-shaped, and water channels are provided in both the first thrust ring and the second thrust ring, so that the concentrated water outlet of the module and the cleaning concentrated water outlet of the module are both communicated with the membrane element through the water channels of the first thrust ring, and the water inlet of the module and the cleaning water inlet of the module are both communicated with the membrane element through the water channels of the second thrust ring;

[0027] The membrane element is a spiral wound membrane element of a reverse osmosis membrane, and a water production channel is provided at the central axis of the membrane element.

[0028] As described above, in addition to being used as the water production outlet of the module, the other of the second water production interface and the first water production interface of the membrane module is used as a water production sampling port, and the water production sampling port is connected to a water production sampling valve.

[0029] As described above, the membrane housing is divided into two parts, and the two parts of the membrane housing are detachably connected through a membrane housing joint.

[0030] A valve is installed between the cleaning water inlet of each membrane module as described above and the corresponding unit cleaning water inlet branch pipe; a valve is installed between the cleaning concentrated water outlet of each membrane module and the corresponding unit cleaning concentrated water branch pipe.

[0031] As described above, the distance between the central axis of the cleaning concentrated water outlet and the central axis of the first end cap is 60-70% of the radius of the first end cap; the distance between the central axis of the cleaning water inlet and the central axis of the second end cap is 60-70% of the radius of the second end cap.

[0032] As described above, the flow rate of the cleaning pump is 20-30m 3 / h, the head of the cleaning pump is 30-40m, the flow rate of the gas-liquid mixing pump is 5-6m 3 / h, the head of the gas-liquid mixing pump is 40-60m, the flow rate of the circulation pump is 60-100m 3 / h, the water inlet flow rate of a single membrane module is 10-15m 3 / h, and the flow rates of the water inlet pump and the booster pump are the same.

[0033] The beneficial technical effects of the present utility model are:

[0034] The membrane module of the present utility model adopts quick connectors, which can facilitate the disassembly, assembly and replacement of the membrane module, and is convenient for the maintenance and installation of the membrane module; the membrane modules are grouped and provided with special cleaning interfaces and cleaning pipelines, so that offline cleaning of a single membrane module can be realized, thereby realizing the recovery of membrane cleaning under the condition of non-stop operation. Description of the Drawings

[0035] Figure 1 is a schematic diagram of the overall structure of the membrane module;

[0036] Figure 2 is a schematic diagram of the partial structure of the membrane module;

[0037] Figure 3 is a schematic diagram of the overall structure of the reverse osmosis membrane device;

[0038] Figure 4 is a top view of the membrane installation bracket of the reverse osmosis membrane device.

[0039] In the figure: 1 - membrane shell; 2 - first end cap; 3 - second end cap; 4 - component water inlet; 5 - component concentrated water outlet; 6 - second product water interface; 7 - first product water interface; 8 - component cleaning water inlet; 9 - component cleaning concentrated water outlet; 10 - membrane element; 11 - first end cap joint; 12 - second end cap joint; 13 - first thrust ring; 14 - second thrust ring; 15 - first adapter; 16 - second adapter; 17 - membrane shell joint; 18 - membrane shell bottom bracket; 21 - water inlet tank; 22 - water inlet pump; 23 - booster pump; 24 - circulation pump; 25 - cleaning pump; 26 - gas-liquid mixing pump; 27 - dissolved air tank; 28 - cleaning water tank; 29 - product water tank; 30 - concentrated water tank; 31 - concentrated water return pipe; 32 - concentrated water outlet pipe; 33 - product water pipe; 34 - cleaning product water return pipe; 35 - cleaning concentrated water return pipe; 36 - cleaning water inlet pipe; 37 - membrane installation bracket; 38 - membrane shell bundling band; 39 - flushing discharge pipe; 40 - water inlet main pipe. Detailed Embodiments

[0040] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] As Figures 1 to 4, A reverse osmosis membrane device for bright annealing wastewater treatment, comprising a membrane module unit, a feed water tank 21, a cleaning water tank 28, a product water tank 29, and a concentrate water tank 30. The outlet of the feed water tank 21 is sequentially connected to the inlet main pipe 40 through a feed water pump 22, a booster pump 23, and a circulation pump 24, and the inlet main pipe 40 is communicated with the water inlet of the membrane module unit;

[0042] The product water outlets of the membrane module unit are respectively communicated with the corresponding product water pipes 33 and the cleaning product water return pipe 34 of the membrane module unit; the outlet of the product water pipe 33 is connected to the product water tank 29, the outlet of the cleaning product water return pipe 34 is connected to the inlet of the cleaning water tank 28, and valves are installed on both the product water pipe 33 and the cleaning product water return pipe 34;

[0043] The concentrate water outlets of the membrane module unit are respectively communicated with the corresponding concentrate water return pipes 31, the concentrate water outlet pipes 32, and the flushing discharge pipe 39 of the membrane module unit; the outlet of the concentrate water return pipe 31 is connected to the inlet of the circulation pump 24; the concentrate water outlet pipe 32 is connected to the concentrate water tank 30; the flushing discharge pipe 39 is connected to an external sewage treatment system; valves are installed on both the concentrate water outlet pipe 32 and the flushing discharge pipe 39;

[0044] The cleaning water inlet of the membrane module unit is respectively connected to the outlet of a cleaning pump 25 and the outlet of a dissolved air tank 27 through a cleaning water inlet pipe 36. The inlet of the dissolved air tank 27 is connected to the outlet of a gas-liquid mixing pump 26. The outlet of the cleaning water tank 28 is respectively connected to the inlet of the cleaning pump 25 and the inlet of the gas-liquid mixing pump 26, and the air inlet of the gas-liquid mixing pump 26 is connected to external air;

[0045] The cleaning concentrate water outlet of the membrane module unit is connected to the inlet of the cleaning water tank 28 through a cleaning concentrate water return pipe 35.

[0046] The membrane module unit includes a membrane module. The membrane module includes a cylindrical membrane housing 1. The two ends of the membrane housing 1 are respectively detachably connected to a first end cover 2 and a second end cover 3. In this embodiment, the first end cover 2 is detachably connected to the membrane housing 1 through a first end cover joint 11, and the second end cover 3 is detachably connected to the membrane housing 1 through a second end cover joint 12. The first end cover 2 is provided with a first product water interface 7 and a component cleaning concentrate water outlet 9, and the second end cover 3 is provided with a second product water interface 6 and a component cleaning water inlet 8; component water inlets 4 and component concentrate water outlets 5 are respectively provided on the side walls of the membrane housing 1 near both ends; the component water inlet 4 serves as the water inlet of the membrane module unit, the first product water interface 7 or the second product water interface 6 is the component product water outlet of the membrane module, the component product water outlet serves as the product water outlet of the membrane module unit, the component concentrate water outlet 5 serves as the concentrate water outlet of the membrane module unit, the component cleaning water inlet 8 serves as the cleaning water inlet of the membrane module unit, and the component cleaning concentrate water outlet 9 serves as the cleaning concentrate water outlet of the membrane module unit.

[0047] Inside the membrane housing 1, a first thrust ring 13, a membrane element 10, and a second thrust ring 14 are sequentially installed along the central axis direction of the membrane housing 1. The first thrust ring 13 abuts against the first end cap 2 and the membrane element 10 respectively, and the second thrust ring 14 abuts against the second end cap 3 and the membrane element 10 respectively. One end of the first water production interface 7 passes through the first end cap 2 and is connected to one end of the first adapter 15. The other end of the first adapter 15 passes through the first thrust ring 13 and is connected to one end of the water production channel of the membrane element 10. One end of the second water production interface 6 passes through the second end cap 3 and is connected to one end of the second adapter 16. The other end of the second adapter 16 passes through the second thrust ring 14 and is connected to the other end of the water production channel of the membrane element 10. The optical finishing wastewater flowing in from the module water inlet 4, after being filtered by the membrane element 10, the produced water flows towards both ends of the membrane element 10 through the water production channel of the membrane element 10. After passing through the first thrust ring 13 and the second thrust ring 14, it flows towards the first water production interface 7 and the second water production interface 6. Among the second water production interface 6 and the first water production interface 7 of the membrane module, one serves as the module water production outlet, and the other serves as the water production sampling port. The water production sampling port is connected to a water production sampling valve. When treating the optical finishing wastewater, the water production sampling valve is closed, and the water production sampling valve of the membrane module is only opened when checking whether the water production flow rate has decreased, and then judging whether to perform chemical cleaning to perform individual water production sampling. In this embodiment, the second water production interface 6 serves as the water production sampling port and is connected to the water production sampling valve.

[0048] Both the first thrust ring 13 and the second thrust ring 14 are cylindrical or frustum-shaped, and water passing channels are provided in both the first thrust ring 13 and the second thrust ring 14, so that the module concentrated water outlet 5 and the module cleaning concentrated water outlet 9 are both communicated with the membrane element 10 through the water passing channel of the first thrust ring 13, and the module water inlet 4 and the module cleaning water inlet 8 are both communicated with the membrane element 10 through the water passing channel of the second thrust ring 14;

[0049] The membrane element 10 is a spiral wound membrane element of a reverse osmosis membrane, and the central axis of the membrane element 10 is a water production channel. In order to make the cleaning water flowing in from the module cleaning water inlet 8 fully contact with the membrane element 10 and the cleaning concentrated water quickly discharged from the module cleaning concentrated water outlet 9, the distance between the central axis of the module cleaning concentrated water outlet 9 and the central axis of the first end cap 2 is 60 - 70% of the radius of the first end cap 2; the distance between the central axis of the module cleaning water inlet 8 and the central axis of the second end cap 3 is 60 - 70% of the radius of the second end cap 3.

[0050] The membrane housing 1 is divided into two parts, and the two parts of the membrane housing 1 are detachably connected through a membrane housing joint 17. In this embodiment, the lengths of the two parts of the membrane housing 1 are the same. The two-piece type is adopted for convenient disassembly, and one part of the membrane housing 1 can be removed to take out the membrane element 10 inside the membrane housing 1. Further, the first end cap joint 11, the second end cap joint 12, and the membrane housing joint 17 all adopt quick connectors to facilitate the disassembly and assembly of the membrane module. In this embodiment, the quick connectors used for the first end cap joint 11, the second end cap joint 12, and the membrane housing joint 17 adopt copyrigh connectors. The module concentrated water inlet 5 and the module water inlet 4 both adopt copyrigh connectors to connect with the membrane housing 1. Quick-connect flanges are used between the first water production interface 7 and the first adapter 15, and between the second water production interface 6 and the second adapter 16. Copyrigh connectors are used to connect between the module cleaning water inlet 8 and the second end cap 3, and between the module cleaning concentrated water inlet 9 and the first end cap 2.

[0051] The second end cap 3 of the membrane module is connected to the membrane housing bottom bracket 18, and the membrane housing bottom bracket 18 is fixed to the bottom end face of the second end cap 3 by bolts.

[0052] In this embodiment, the position of the module water inlet 4 on the membrane housing 1 is symmetrical to the position of the module concentrated water inlet 5, that is, the distance between the module water inlet 4 and the membrane housing joint 17 is the same as the distance between the module concentrated water inlet 5 and the membrane housing joint 17, and the connection line between the module water inlet 4 and the module concentrated water inlet 5 is parallel to the central axis of the membrane housing 1.

[0053] In this embodiment, the center of the module concentrated water inlet 5 is 5 - 10 cm higher than the top of the membrane element 10;

[0054] The membrane housing 1 is made of stainless steel. The maximum working pressure of the membrane housing 1 is greater than 2.5 Mpa, the actual working pressure of the membrane housing 1 is 0.8 - 2.0 Mpa, and the length of the membrane housing 1 is 1.4 - 1.5 m.

[0055] In this embodiment, the membrane element 10 adopts a spiral wound membrane element of reverse osmosis membrane. The surface of the membrane element 10 is electrically neutral, and the membrane element 10 adopts a wide water inlet channel, and the water inlet channel is 65 - 85 mil.

[0056] Further, to improve the purification ability of the membrane module unit, the membrane module unit includes a plurality of serially connected membrane modules:

[0057] The module water inlet 4 of the first membrane module serves as the water inlet of the membrane module unit; among the membrane modules except the first membrane module, the module water inlet 4 of the current membrane module is connected to the module concentrated water inlet 5 of the previous membrane module; the module concentrated water inlet 5 of the last membrane module in the membrane module unit serves as the concentrated water outlet of the membrane module unit;

[0058] The first water production interface 7 or the second water production interface 6 of the membrane module is the component water outlet of the module. The component water outlets of the membrane modules in the membrane module unit are connected to the unit water production branch pipes, and the water outlet of the unit water production branch pipe serves as the water outlet of the membrane module unit;

[0059] The component cleaning water inlet 8 of all the membrane modules in the membrane module unit is connected to the unit cleaning water inlet branch pipe, and the water inlet of the unit cleaning water inlet branch pipe serves as the cleaning water inlet of the membrane module unit;

[0060] The component cleaning concentrated water outlet 9 of all the membrane modules in the membrane module unit is connected to the unit cleaning concentrated water branch pipe, and the water outlet of the unit cleaning concentrated water branch pipe serves as the cleaning concentrated water outlet of the membrane module unit.

[0061] Each membrane module is fixed on the membrane installation bracket 37. Specifically, the bottom of the membrane module is connected to the membrane installation bracket 37 through the membrane shell bottom bracket 18, and the middle of the membrane shell 1 of the membrane module is connected to the membrane installation bracket 37 through the membrane shell bundling belt 38.

[0062] Furthermore, to achieve offline cleaning of a single group of membrane modules (i.e., a membrane module unit containing multiple membrane modules), so as to realize membrane cleaning recovery under the condition of non-stop operation. Multiple membrane module units are connected in parallel. In this embodiment, each of the two membrane module units includes 4 membrane modules, and the membrane modules in each membrane module unit are arranged in a row, and the two membrane module units are symmetrically arranged on the membrane installation bracket 37.

[0063] The water inlets of each membrane module unit are connected to the water inlet main pipe 40 through the unit water inlet branch pipes, and valves are installed on the unit water inlet branch pipes;

[0064] The concentrated water outlets of each membrane module unit are respectively communicated with the corresponding concentrated water return pipe 31, concentrated water outlet pipe 32 and flushing discharge pipe 39 of the membrane module unit through the unit concentrated water branch pipes, and valves are installed on the unit concentrated water branch pipes;

[0065] Isolation valves are installed on the unit water production branch pipes, unit cleaning water inlet branch pipes and unit cleaning concentrated water branch pipes;

[0066] The water production pipes 33 of all the membrane module units are connected to the water production tank 29 through the water production main pipe, and the cleaning water production return pipes 34 of all the membrane module units are connected to the water inlet of the cleaning water tank 28 through the cleaning water production return main pipe;

[0067] The concentrated water return pipes 31 of all membrane module units are connected to the water inlet of the circulation pump 24 through the main concentrated water return pipe. The concentrated water outlet pipes 32 of all membrane module units are connected to the concentrated water tank 30 through the main concentrated water outlet pipe. The flushing discharge pipes 39 of all membrane module units are connected to the external sewage treatment system through the main flushing discharge pipe. The specified membrane module unit can be isolated by closing the valves of the unit inlet branch pipes, the valves of the unit concentrated water branch pipes, and the partition valves in the membrane module unit, without interrupting the waste water treatment process of the skin pass mill.

[0068] The flow rate of the cleaning pump 25 is 20 - 30 m 3 / h, the head of the cleaning pump 25 is 30 - 40 m, the flow rate of the gas-liquid mixing pump 26 is 5 - 6 m 3 / h, the head of the gas-liquid mixing pump 26 is 40 - 60 m, the flow rate of the circulation pump 24 is 60 - 100 m 3 / h, the inlet water flow rate of a single membrane module is 10 - 15 m 3 / h, the flow rates of the inlet water pump 22 and the booster pump 23 are the same.

[0069] Furthermore, a valve is installed between the component cleaning water inlet 8 of each membrane module and the corresponding unit cleaning water inlet branch pipe; a valve is installed between the component cleaning concentrated water outlet 9 of each membrane module and the corresponding unit cleaning concentrated water branch pipe, so as to isolate the specified membrane module and perform precise chemical cleaning separately.

[0070] During the stage of using the membrane module to filter the waste water of the skin pass mill: the inlet water pump 22, the booster pump 23, and the circulation pump 24 are all turned on and kept running; the cleaning pump 25 and the gas-liquid mixing pump 26 are both turned off, the valve on the concentrated water outlet pipe 32 is opened, the valve on the flushing discharge pipe 39 is closed, the partition valves on the cleaning water production return pipe 34 and each unit cleaning concentrated water branch pipe connected to the cleaning concentrated water return pipe 35 are closed, and the valve on the water production pipe 33 is opened; the concentrated water return pipe 31 remains connected.

[0071] Furthermore, as a preference of this embodiment, during the operation of the reverse osmosis membrane device, the membrane module is periodically flushed forward. A forward flush is performed once every 6 - 12 hours of continuous operation. The forward flush process is as follows: keep the inlet water pump 22, the booster pump 23, and the circulation pump 24 running, the cleaning pump 25 and the gas-liquid mixing pump 26 are both turned off, the valve on the cleaning water production return pipe 34 and the partition valves on each unit cleaning concentrated water branch pipe connected to the cleaning concentrated water return pipe 35 are closed. For the membrane module unit that needs to be cleaned: close the valve on the concentrated water outlet pipe 32, open the valve on the flushing discharge pipe 39, the valve on the flushing discharge pipe 39 is fully open, the concentrated water of the membrane module is discharged from the flushing discharge pipe 39 to the external sewage treatment system, and the water production pipe 33 is opened; the concentrated water return pipe 31 remains connected, and the forward flush time is 1 - 2 min.

[0072] Further, as a preference of this embodiment, during the operation of the reverse osmosis membrane device, the membrane module is periodically flushed forward. Each time during the forward flushing, only a part of the membrane module units are cleaned, and the other membrane module units remain in the operating state.

[0073] In the chemical cleaning stage: To ensure the continuous operation of the entire reverse osmosis membrane device, the present utility model can only chemically clean some groups of membrane modules. For the membrane module units that need to be cleaned: the valves of the unit inlet branch pipe, the valves of the unit concentrated water branch pipe, and the valve of the product water pipe 33 corresponding to the corresponding unit are closed; there is no concentrated water discharged from the corresponding concentrated water outlet pipe 32 and the flushing discharge pipe 39. The isolation valve on the unit cleaning inlet branch pipe, the isolation valve of the unit product water branch pipe, the valve on the cleaning product water return pipe 34, and the isolation valve on the unit cleaning concentrated water branch pipe connected to the cleaning concentrated water return pipe 35 are opened; the inlet water pump 22, the booster pump 23, the circulation pump 24, the cleaning pump 25, and the gas-liquid mixing pump 26 are all turned on, so that the other membrane module units that do not need chemical cleaning continue to operate normally.

[0074] Further, as a preference of this embodiment, during chemical cleaning, first turn off the cleaning pump 25 without adding medicine for dissolved air flushing, and then turn on the cleaning pump 25 to add medicine for dissolved air flushing.

[0075] In this embodiment, when disassembling and assembling the membrane module, first stop the operation, close the isolation valve of the unit product water branch pipe, the valve of the unit inlet branch pipe, and the valve of the unit concentrated water branch pipe of the membrane module unit to be disassembled and assembled. At the same time, close the corresponding valves of the component cleaning inlet 8 and the component cleaning concentrated water outlet 9 of each membrane module. After the valves are closed, the other membrane modules resume operation; when the product water flow rate drops to 20%, chemical cleaning is carried out. When chemically cleaning the membrane module in the operating state, first stop the machine and close the valve of the unit inlet branch pipe and the valve of the unit concentrated water branch pipe of the membrane module unit that needs chemical cleaning, then close the valve of the product water pipe 33 of this membrane module unit. After that, connect the unit product water branch pipe to the cleaning product water return pipe 34, open the isolation valve on the unit cleaning concentrated water branch pipe connected to the cleaning concentrated water return pipe 35, open the isolation valve on the unit cleaning inlet branch pipe, and then resume the operation of the other membrane modules.

[0076] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered by the scope of the claims of the present utility model.

Claims

1. A reverse osmosis membrane device for bright annealing wastewater treatment, comprising a water inlet tank (21), characterized in that: The outlet of the water inlet tank (21) is connected to the main water inlet pipe (40) through a water inlet pump (22), a booster pump (23) and a circulation pump (24) in sequence, and the main water inlet pipe (40) is communicated with the water inlet of the membrane module unit; The water production outlets of the membrane module unit are respectively communicated with the corresponding water production pipes (33) and the cleaning water production return pipe (34) of the membrane module unit; the outlet of the water production pipe (33) is connected to the water production tank (29), the outlet of the cleaning water production return pipe (34) is connected to the inlet of the cleaning water tank (28), and valves are installed on both the water production pipe (33) and the cleaning water production return pipe (34); The concentrated water outlets of the membrane module unit are respectively communicated with the corresponding concentrated water return pipes (31), concentrated water outlet pipes (32) and flushing discharge pipes (39) of the membrane module unit; the outlet of the concentrated water return pipe (31) is connected to the inlet of the circulation pump (24); the concentrated water outlet pipe (32) is connected to the concentrated water tank (30); the flushing discharge pipe (39) is connected to the external sewage treatment system; valves are installed on both the concentrated water outlet pipe (32) and the flushing discharge pipe (39); The cleaning water inlets of the membrane module unit are respectively connected to the outlets of a cleaning pump (25) and a dissolved air tank (27) through a cleaning water inlet pipe (36), the inlet of the dissolved air tank (27) is connected to the outlet of a gas-liquid mixing pump (26), the outlet of the cleaning water tank (28) is respectively connected to the inlet of the cleaning pump (25) and the inlet of the gas-liquid mixing pump (26), and the air inlet of the gas-liquid mixing pump (26) is connected to the external air; The cleaning concentrated water outlet of the membrane module unit is connected to the inlet of the cleaning water tank (28) through a cleaning concentrated water return pipe (35).

2. The reverse osmosis membrane device for bright annealing wastewater treatment according to claim 1, characterized in that: The membrane module unit includes membrane modules. The membrane module includes a cylindrical membrane shell (1), and both ends of the membrane shell (1) are detachably connected to a first end cover (2) and a second end cover (3) respectively. A first water production interface (7) and a module cleaning concentrated water outlet (9) are provided on the first end cover (2), and a second water production interface (6) and a module cleaning water inlet (8) are provided on the second end cover (3); component water inlets (4) and component concentrated water outlets (5) are respectively provided on the side walls of the membrane shell (1) near both ends; The component water inlet (4) serves as the water inlet of the membrane module unit, the first water production interface (7) or the second water production interface (6) is the component water production outlet of the membrane module, the component water production outlet serves as the water production outlet of the membrane module unit, the component concentrated water outlet (5) serves as the concentrated water outlet of the membrane module unit, the component cleaning water inlet (8) serves as the cleaning water inlet of the membrane module unit, and the component cleaning concentrated water outlet (9) serves as the cleaning concentrated water outlet of the membrane module unit.

3. The reverse osmosis membrane device for bright annealing wastewater treatment according to claim 1, wherein: The membrane module unit includes a plurality of serially connected membrane modules. The membrane module includes a cylindrical membrane shell (1), and both ends of the membrane shell (1) are detachably connected to a first end cover (2) and a second end cover (3) respectively. A first water production interface (7) and a module cleaning concentrated water outlet (9) are provided on the first end cover (2), and a second water production interface (6) and a module cleaning water inlet (8) are provided on the second end cover (3); component water inlets (4) and component concentrated water outlets (5) are respectively provided on the side walls of the membrane shell (1) near both ends; The component water inlet (4) of the first membrane module serves as the water inlet of the membrane module unit; among the membrane modules other than the first membrane module, the component water inlet (4) of the current membrane module is connected to the component concentrated water outlet (5) of the previous membrane module; the component concentrated water outlet (5) of the last membrane module in the membrane module unit serves as the concentrated water outlet of the membrane module unit. The first water production interface (7) or the second water production interface (6) of the membrane module is the component water production outlet, and the component water production outlets of the membrane modules in the membrane module unit are connected to the unit water production branch pipes, and the outlet of the unit water production branch pipe serves as the water production outlet of the membrane module unit. The component cleaning water inlets (8) of all the membrane modules in the membrane module unit are connected to the unit cleaning water inlet branch pipe, and the water inlet of the unit cleaning water inlet branch pipe serves as the cleaning water inlet of the membrane module unit. The component cleaning concentrated water outlets (9) of all the membrane modules in the membrane module unit are connected to the unit cleaning concentrated water branch pipe, and the outlet of the unit cleaning concentrated water branch pipe serves as the cleaning concentrated water outlet of the membrane module unit.

4. The reverse osmosis membrane device for skin pass mill wastewater treatment according to claim 3, wherein, A plurality of the membrane module units are connected in parallel. The water inlets of the membrane module units are connected to the water inlet main pipe (40) through the unit water inlet branch pipes, and valves are installed on the unit water inlet branch pipes. The concentrated water outlets of the membrane module units are respectively communicated with the corresponding concentrated water return pipes (31), concentrated water outlet pipes (32) and flushing discharge pipes (39) of the membrane module units after passing through the unit concentrated water branch pipes, and valves are installed on the unit concentrated water branch pipes. Isolation valves are installed on the unit water production branch pipes, unit cleaning water inlet branch pipes and unit cleaning concentrated water branch pipes. The water production pipes (33) of all the membrane module units are connected to the water production tank (29) through the water production main pipe, and the cleaning water production return pipes (34) of all the membrane module units are connected to the water inlet of the cleaning water tank (28) through the cleaning water production return main pipe. The concentrated water return pipes (31) of all the membrane module units are connected to the water inlet of the circulation pump (24) through the concentrated water return main pipe, the concentrated water outlet pipes (32) of all the membrane module units are connected to the concentrated water tank (30) through the concentrated water outlet main pipe, and the flushing discharge pipes (39) of all the membrane module units are connected to the external sewage treatment system through the flushing discharge main pipe.

5. The reverse osmosis membrane device for temper mill wastewater treatment according to any one of claims 2-4, characterized in that: Inside the membrane housing (1), a first thrust ring (13), a membrane element (10) and a second thrust ring (14) are sequentially installed along the central axis direction of the membrane housing (1). One end of the first water production interface (7) passes through the first end cap (2) and is connected to one end of the first adapter (15). The other end of the first adapter (15) passes through the first thrust ring (13) and is connected to one end of the water production channel of the membrane element (10). One end of the second water production interface (6) passes through the second end cap (3) and is connected to one end of the second adapter (16). The other end of the second adapter (16) passes through the second thrust ring (14) and is connected to the other end of the water production channel of the membrane element (10). The first thrust ring (13) and the second thrust ring (14) are both cylindrical or frustum-shaped, and water passing channels are provided in both the first thrust ring (13) and the second thrust ring (14), so that the concentrated water outlet (5) of the component and the concentrated water outlet (9) for component cleaning are both communicated with the membrane element (10) through the water passing channels of the first thrust ring (13), and the water inlet (4) of the component and the water inlet (8) for component cleaning are both communicated with the membrane element (10) through the water passing channels of the second thrust ring (14); The membrane element (10) is a spiral wound membrane element of a reverse osmosis membrane, and a water production channel is provided at the central axis of the membrane element (10).

6. The reverse osmosis membrane device for temper mill wastewater treatment according to any one of claims 2-4, characterized in that: In the second water production interface (6) and the first water production interface (7) of the membrane module, the other one except the water production outlet of the component serves as a water production sampling port, and the water production sampling port is connected to a water production sampling valve.

7. Any reverse osmosis membrane device for bright annealing wastewater treatment according to any one of claims 2-4, characterized in that: The membrane housing (1) is divided into two parts, and the two parts of the membrane housing (1) are detachably connected through a membrane housing joint (17).

8. The reverse osmosis membrane device for bright annealing wastewater treatment according to any one of claims 3-4, characterized in that: A valve is installed between the water inlet (8) for component cleaning of each membrane module and the corresponding unit cleaning water inlet branch pipe; a valve is installed between the concentrated water outlet (9) for component cleaning of each membrane module and the corresponding unit cleaning concentrated water branch pipe.

9. The reverse osmosis membrane device for bright annealing wastewater treatment according to any one of claims 2-4, characterized in that: The distance between the central axis of the concentrated water outlet (9) for component cleaning and the central axis of the first end cap (2) is 60-70% of the radius of the first end cap (2); the distance between the central axis of the water inlet (8) for component cleaning and the central axis of the second end cap (3) is 60-70% of the radius of the second end cap (3).

10. The reverse osmosis membrane device for bright annealing wastewater treatment according to any one of claims 2-4, characterized in that: The flow rate of the cleaning pump (25) is 20 to 30 m 3 / h, the head of the cleaning pump (25) is 30 to 40 m, the flow rate of the gas-liquid mixing pump (26) is 5 to 6 m 3 / h, the head of the gas-liquid mixing pump (26) is 40 to 60 m, the flow rate of the circulation pump (24) is 60 to 100 m 3 / h, the inlet water flow rate of a single membrane module is 10 to 15 m 3 / h, the flow rates of the feed water pump (22) and the booster pump (23) are the same.

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