CN219950598U - Reverse osmosis water treatment system - Google Patents

Abstract

The utility model discloses a reverse osmosis water treatment system, comprising: a first stage reverse osmosis unit; the water producing ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with a water purifying tank, and the concentrated water ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with a concentrated water tank; the cleaning device is used for cleaning the secondary reverse osmosis device; the first switch is arranged between the first-stage reverse osmosis device and the concentrated water tank, and the second switch is arranged between the first-stage reverse osmosis device and the second-stage reverse osmosis device. Compared with the prior art, the reverse osmosis water treatment system provided by the utility model can improve the water recycling rate and reduce the concentrated water discharge.

Description

Reverse osmosis water treatment system

Technical Field

The utility model relates to the technical field of water treatment, in particular to a reverse osmosis water treatment system.

Background

The mature desalted water treatment process in the industrial desalted water treatment industry at present comprises an ion exchange method, a reverse osmosis method, a continuous electric desalting method (EDI), an electrodialysis method and the like. The primary desalted water treatment process is mainly an ion exchange process and a reverse osmosis process, wherein a continuous Electrodeionization (EDI) process and an electrodialysis process are mainly used for the rear-stage deep desalting process, and compared with the ion exchange process, the reverse osmosis process has the advantages of no need of using a large amount of chemical agents and acid-base regeneration treatment, convenient operation, stable water quality of product water and the like, is popular in the market, and the reverse osmosis process is adopted in more than 90% of the primary desalting processes in the market at present.

Along with the shortage of domestic water resources, the water source of industrial water is gradually changed from original underground water into surface water or industrial reclaimed water, the water source is gradually complicated, the salt content in the water body is higher and higher, and the reverse osmosis recovery rate is affected. In particular, in the reverse osmosis process section of the reclaimed water recycling system, the recovery rate of water is only about 70%, so that reclaimed water cannot be fully utilized.

Therefore, there is a need for a reverse osmosis water treatment system that increases the water utilization rate of reverse osmosis desalinated water treatment and reduces the amount of concentrate water discharge.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a reverse osmosis water treatment system which can improve the recycling rate of water and reduce the discharge amount of concentrated water.

The technical scheme provided by the utility model is as follows:

a reverse osmosis water treatment system comprising:

a first stage reverse osmosis unit;

the water producing ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with a water purifying tank, and the concentrated water ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with a concentrated water tank;

the cleaning device is used for cleaning the secondary reverse osmosis device;

the first switch is arranged between the first-stage reverse osmosis device and the concentrated water tank, and the second switch is arranged between the first-stage reverse osmosis device and the second-stage reverse osmosis device.

Preferably, the method further comprises:

a water producing valve arranged between the water producing end of the secondary reverse osmosis device and the water purifying tank;

and the regulating valve is arranged between the concentrated water end of the secondary reverse osmosis device and the concentrated water tank.

Preferably, the cleaning device comprises:

the cleaning water pipe is connected with the water inlet end of the secondary reverse osmosis device through a third switch;

the RO cleaning water tank is connected with the concentrated water end of the second-stage reverse osmosis device through a fourth switch, and the RO cleaning water tank is communicated with the water producing end of the second-stage reverse osmosis device through a fifth switch.

Preferably, the method further comprises: a controller;

the controller is respectively connected with the first switch, the second switch, the third switch, the fourth switch and the fifth switch.

Preferably, the method further comprises:

a first pressure transmitter and a first flow transmitter disposed between the primary reverse osmosis unit and the secondary reverse osmosis unit;

a second pressure transmitter and a second flow transmitter disposed between the second stage reverse osmosis unit and the clean water tank;

the controller is respectively connected with the first pressure transmitter, the second pressure transformer, the first flow transmitter and the second flow transmitter.

Preferably, the method further comprises:

and the first pressure sensor and the first flow sensor are arranged between the second-stage reverse osmosis device and the concentrate tank.

Preferably, the secondary reverse osmosis device comprises:

the first STRO membrane group is connected with the concentrated water end of the first-stage reverse osmosis device, and the water producing end of the first STRO membrane group is connected with the water purifying tank;

the second STRO membrane group is connected with the concentrated water end of the first STRO membrane group, the water producing end of the second STRO membrane group is connected with the water purifying tank, and the concentrated water end of the second STRO membrane group is communicated with the concentrated water tank.

Preferably, the secondary reverse osmosis device further comprises:

a first booster pump disposed between the first stage reverse osmosis unit and the first STRO membrane group;

the first pressure gauge is arranged between the first booster pump and the first stage reverse osmosis device, and a pressure switch is arranged between the first pressure gauge and the first booster pump.

Preferably, the cleaning device further comprises:

a clear water flushing box;

a water supplementing pipeline which is respectively connected with the clean water flushing tank and the RO cleaning water tank,

the dosing pipeline is respectively connected with the clean water flushing tank and the RO cleaning water tank;

and the water outlets of the clean water flushing tank and the RO cleaning water tank are respectively connected with the cleaning water pipe.

Preferably, the cleaning device further comprises:

the liquid level meters are arranged on the clean water flushing tank and the RO cleaning water tank;

a water replenishing valve arranged between the water replenishing pipes;

the cleaning valve is arranged at the water outlet ends of the clean water flushing tank and the RO cleaning water tank;

a thermometer and a pH detector arranged on the RO cleaning water tank.

According to the reverse osmosis water treatment system, the first-stage reverse osmosis device and the second-stage reverse osmosis device are arranged, wherein the second-stage reverse osmosis device is connected with the concentrated water end of the first-stage reverse osmosis device, the water producing ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with the water purifying tank, the concentrated water end of the second-stage reverse osmosis device is connected with the concentrated water tank, and the concentrated water of the first-stage reverse osmosis device is subjected to reverse osmosis treatment through the second-stage reverse osmosis device, so that the recycling rate of water can be improved, and the discharge amount of the concentrated water is reduced. However, when the second-stage reverse osmosis device is used for treating the concentrated water treated by the first-stage reverse osmosis device, the salt content of the concentrated water is increased by several times compared with that of the raw water, organic and inorganic pollutants contained in the concentrated water are more, the second-stage reverse osmosis device is easy to block, a cleaning device, a first switch and a second switch are further arranged for cleaning the second-stage reverse osmosis device, the first switch is arranged between the first-stage reverse osmosis device and a concentrated water tank, the second switch is arranged between the first-stage reverse osmosis device and the second-stage reverse osmosis device, under the condition that the second-stage reverse osmosis device works, the first switch is closed, the second switch is opened, after the first-stage reverse osmosis device carries out reverse osmosis treatment, the purified water flows to a purified water tank, the concentrated water flows to the second-stage reverse osmosis device for carrying out secondary treatment, the water producing end of the second-stage reverse osmosis device is connected with the purified water tank, the concentrated water utilizing rate is improved, the water quantity in the concentrated water tank is reduced, when the second-stage reverse osmosis device is blocked, the second-stage reverse osmosis device needs to be cleaned by the cleaning device, the first switch is closed, the first switch is opened, the first-stage reverse osmosis device does not directly flow to the second-stage reverse osmosis device after the first-stage reverse osmosis device is used for cleaning, and the first-stage reverse osmosis device is not directly treated, and the first-stage reverse osmosis device is cleaned, and the first-stage reverse osmosis device is not directly cleaned, and the high-stage reverse osmosis device is filtered, and the water is filtered. Therefore, compared with the prior art, the reverse osmosis water treatment system provided by the embodiment of the utility model can improve the water recycling rate and reduce the concentrated water discharge.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a reverse osmosis water treatment system according to an embodiment of the present utility model;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a schematic structural diagram of a secondary reverse osmosis device according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a cleaning device according to an embodiment of the present utility model.

Reference numerals: 1. a first stage reverse osmosis unit; 2. a secondary reverse osmosis device; 3. a clean water tank; 4. a concentrate tank; 5. a cleaning device; 21. a first STRO membrane set; 22. a second STRO membrane set; 23. a first booster pump; 24. a first pressure gauge; 25. a pressure switch; 51. a third switch; 52. cleaning a water pipe; 53. a fourth switch; 54. RO cleans the water tank; 55. a fifth switch; 56. a clear water flushing box; 57. a water replenishing pipe; 58. a dosing pipeline; 591. a liquid level gauge; 592. a water supplementing valve; 593. cleaning a valve; 594. a second booster pump; 541. a water return pipe; 542. a water return valve; 61. a first switch; 62. a second switch; 63. a water producing valve; 64. a regulating valve; 71. a first pressure transmitter; 72. a first flow transmitter; 73. a second pressure transmitter; 74. a second flow transmitter; 75. a first pressure sensor; 76. a first flow sensor; 77. a second pressure sensor; 78. a second pressure gauge; 79. and a third pressure gauge.

Detailed Description

In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the technical solutions of the embodiments of the present utility model will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof.

The embodiment of the utility model is written in a progressive manner.

As shown in fig. 1 to 4, an embodiment of the present utility model provides a reverse osmosis water treatment system, comprising: a primary reverse osmosis device 1; the water producing ends of the first-stage reverse osmosis device 1 and the second-stage reverse osmosis device 2 are connected with the water purifying tank 3, and the water concentrating ends of the first-stage reverse osmosis device 1 and the second-stage reverse osmosis device 2 are connected with the water concentrating tank 4; a cleaning device 5 for cleaning the secondary reverse osmosis device 2; a first switch 61 provided between the primary reverse osmosis unit 1 and the concentrate tank 4, and a second switch 62 provided between the primary reverse osmosis unit 1 and the secondary reverse osmosis unit 2.

The reverse osmosis water treatment system in the prior art usually treats raw water through a primary reverse osmosis device, the water producing end of the primary reverse osmosis device is communicated with a water purifying tank, the concentrated water end of the primary reverse osmosis device is directly communicated with the concentrated water tank, but in the desalted water treatment system of raw water with higher salt content, the pure water recovery rate of the primary reverse osmosis device is lower and generally not more than 80%, so that water resources cannot be fully utilized, and in industrial wastewater recycling and zero emission engineering, the reverse osmosis recovery rate is low, the subsequent zero emission pretreatment water quantity is large, and the manufacturing cost of the zero emission system is directly influenced.

According to the reverse osmosis water treatment system provided by the utility model, firstly, the primary reverse osmosis device 1 and the secondary reverse osmosis device 2 are arranged, wherein the water inlet of the secondary reverse osmosis device 2 is connected with the concentrated water end of the primary reverse osmosis device 1, the water producing ends of the primary reverse osmosis device 1 and the secondary reverse osmosis device 2 are connected with the water purifying tank 3, the concentrated water end of the secondary reverse osmosis device 2 is connected with the concentrated water tank 4, and the concentrated water of the primary reverse osmosis device 1 is subjected to reverse osmosis treatment through the secondary reverse osmosis device 2, so that the water recycling rate can be improved, and the concentrated water discharge amount is reduced. In the operation process of the reverse osmosis membrane device, the reverse osmosis membrane can have different scaling problems, particulate matters, microorganism pollution problems and membrane oxidation problems, such as improper treatment, the service life of the reverse osmosis membrane can be seriously reduced, the reverse osmosis membrane device needs to be cleaned at regular time in order to maintain the performance of the reverse osmosis membrane device, the salt content of the concentrated water is increased by several times compared with that of the raw water when the concentrated water is treated by the second reverse osmosis device 2, and the concentrated water contains more organic and inorganic pollutants, so that the second reverse osmosis device 2 is easily blocked, a cleaning device 5, a first switch 61 and a second switch 62 are further arranged, wherein the cleaning device 5 is used for cleaning the second reverse osmosis device 2, the first switch 61 is arranged between the first reverse osmosis device 1 and the concentrated water tank 4, the second switch 62 is arranged between the first-stage reverse osmosis device 1 and the second-stage reverse osmosis device 2, under the condition that the second-stage reverse osmosis device works, the first switch 61 is closed, the second switch 62 is opened, after the first-stage reverse osmosis device 1 carries out reverse osmosis treatment on raw water, the pure water flows into the clean water tank 3, the concentrated water is treated again through the second-stage reverse osmosis device 2, the water producing end of the second-stage reverse osmosis device 2 is connected with the clean water tank 3, the concentrated water end is connected with the concentrated water tank 4, the water utilization rate can be improved, the amount of concentrated water entering the concentrated water tank can be reduced, when the second-stage reverse osmosis device 2 is blocked, the second-stage reverse osmosis device 2 needs to be cleaned through the cleaning device 5, the second switch 62 is closed, the first switch 61 is opened, the concentrated water treated by the first-stage reverse osmosis device 1 directly flows into the concentrated water tank 4, the operation of the first-stage reverse osmosis device 1 is not affected when the cleaning device 5 is cleaned, the water treatment efficiency is higher. Therefore, compared with the prior art, the reverse osmosis water treatment system provided by the embodiment of the utility model can improve the water recycling rate, reduce the concentrated water discharge amount and reduce the application cost of the zero discharge system.

In the above-described structure, as one of the embodiments, the reverse osmosis water treatment system according to the present utility model further includes a water producing valve 63 and a regulating valve 64, wherein the water producing valve 63 is disposed between the secondary reverse osmosis unit 2 and the clean water tank 3, the regulating valve 64 is disposed between the concentrate end of the secondary reverse osmosis unit 2 and the concentrate tank 4, when the secondary reverse osmosis unit 2 is cleaned, the water producing valve 63 is closed to prevent the water flow of the water producing end of the secondary reverse osmosis unit 2 from entering the clean water tank 3 during the cleaning process, to pollute the clean water, and the regulating valve 64 is closed to prevent the water flow of the concentrate end of the secondary reverse osmosis unit 2 from entering the concentrate tank 4.

In the above structure, as a specific implementation manner, the cleaning device 5 in the embodiment of the present utility model includes the cleaning water pipe 52 and the RO cleaning water tank 54, where the cleaning water pipe 52 is connected to the water inlet end of the secondary reverse osmosis device 2, the secondary reverse osmosis device 2 is cleaned by the cleaning water pipe 52, the cleaning water pipe 52 is provided with the third switch 51, the RO cleaning water tank 54 is connected to the water producing end and the concentrate end of the secondary reverse osmosis device 2, the fourth switch 53 is provided between the RO cleaning water tank 54 and the water producing end of the secondary reverse osmosis device 2, and the fifth switch 55 is provided between the RO cleaning water tank 54 and the concentrate end of the secondary reverse osmosis device 2, and the cleaning water of the secondary reverse osmosis device 2 is treated by the RO cleaning water tank 54. In the process of the cleaning device 5, the second switch 62, the water producing valve 63 and the regulating valve 64 are closed, the first switch 61, the third switch 51, the fourth switch 53 and the fifth switch 55 are opened, the raw water is treated by the primary reverse osmosis device 1, the concentrated water enters the concentrated water tank 4, the pure water enters the clean water tank 3, the cleaning water in the cleaning water pipe 52 enters from the water inlet end of the secondary reverse osmosis device 2 and cleans the inside of the secondary reverse osmosis device 2, and the cleaned cleaning water enters the RO cleaning water tank 54 for treatment.

Further, as one implementation manner, the reverse osmosis water treatment system in the embodiment of the present utility model further includes a controller, wherein the controller is connected to the first switch 61, the second switch 62, the third switch 51, the fourth switch 53 and the fifth switch 55, respectively. The controller controls the first switch 61, the second switch 62, the third switch 51, the fourth switch 53 and the fifth switch 55 to be opened and closed, so that the operation and shutdown cleaning processes of the secondary reverse osmosis device 2 are realized, and the operation and shutdown cleaning processes are more intelligent and convenient.

Because the salt content of the current industrial water source is higher and higher, the concentration of the pollutants of the concentrated water after being treated by the first-stage reverse osmosis device 1 is increased, so that the second-stage reverse osmosis device 2 is polluted first, chemical cleaning is required to be performed on the second-stage reverse osmosis device 2, and in order to more clearly judge whether the cleaning is required to be performed on the second-stage reverse osmosis device 2, as one implementation mode, the reverse osmosis water treatment system in the embodiment of the utility model further comprises a first pressure transmitter 71, a first flow transmitter 72, a second pressure transmitter 73 and a second flow transmitter 74, wherein the first pressure transmitter 71 and the first flow transmitter 72 are arranged between the first-stage reverse osmosis device 1 and the second-stage reverse osmosis device 2, the second pressure transmitter 73 and the second flow transmitter 74 are arranged between the water producing end of the second-stage reverse osmosis device 2 and the clean water tank 3, and the controller is respectively connected with the first pressure transmitter 71, the first flow transmitter 72, the second pressure transmitter 73 and the second flow transmitter 74, and calculates the sewage flow rate through the preset product flow rate of the second reverse osmosis device 2, and calculates whether the cleaning is required to be performed by the second-stage reverse osmosis device 2.

In the above-mentioned structure, as another embodiment, it may also be determined whether the second-stage reverse osmosis device 2 needs to be cleaned by the change of the pressure and the flow rate of the concentrate end, and the reverse osmosis water treatment system according to the embodiment of the present utility model further includes the first pressure sensor 75 and the first flow sensor 76 disposed between the second-stage reverse osmosis device 2 and the concentrate tank 4, the pressure of the concentrate end of the second-stage reverse osmosis device 2 is detected by the first pressure sensor 75, the flow rate of the concentrate end of the second-stage reverse osmosis device 2 is detected by the first flow sensor 76, and when the operator observes that the pressure of the concentrate end and the concentrate flow rate of the concentrate end increase to the preset index, the second-stage reverse osmosis device 2 may also be cleaned as required.

In the above-described structure, as one of the embodiments, the secondary reverse osmosis apparatus 2 according to the embodiment of the present utility model includes: the first STRO membrane group 21 is connected with the concentrated water end of the first-stage reverse osmosis device 1, and the water producing end of the first STRO membrane group 21 is connected with the water purifying tank 3; and the second STRO membrane group 22 is connected with the concentrated water end of the first STRO membrane group 21, the water producing end of the second STRO membrane group 22 is connected with the clean water tank 3, and the concentrated water end of the second STRO membrane group 22 is communicated with the concentrated water tank 4. Specifically, the concentrated water treated by the first-stage reverse osmosis device 1 enters the first STRO membrane group 21 for treatment, the pure water at the water producing end of the first STRO membrane group 21 enters the clean water tank 3 for storage, the concentrated water at the concentrated water end of the first STRO membrane group 21 enters the second STRO membrane group 22 for treatment, the pure water at the water producing end of the second STRO membrane group 22 is connected with the clean water tank 3 for storage, the concentrated water at the concentrated water end of the second STRO membrane group 22 is communicated with the concentrate tank 4, and the concentrated water amount entering the concentrate tank 4 is reduced due to the first STRO membrane group 21 and the second STRO membrane group 22.

Further, the membrane elements adopted by the first STRO membrane group 21 and the second STRO membrane group 22 are reverse osmosis membrane elements with wide flow channels, and the reverse osmosis membrane elements are characterized by wide flow channels, strong pollution resistance, and capability of adapting to the characteristic of high organic and inorganic pollutants of reverse osmosis concentrated water, and the frequency of cleaning the first STRO membrane group 21 and the second STRO membrane group 22 is reduced.

The concentrated water is treated by adopting the STRO membrane group in the second-stage reverse osmosis device 2, the water end pressure of the system of the first-stage reverse osmosis device 1 is used as the driving force of most osmotic pressure, and the operation energy consumption of the second-stage reverse osmosis device 2 is saved.

As one of the implementation manners, the second stage reverse osmosis device 2 in the embodiment of the present utility model further includes a first booster pump 23 disposed between the first stage reverse osmosis device 1 and the first STRO membrane group 21, the first booster pump 23 is capable of boosting the concentrated water output from the concentrated water end of the first stage reverse osmosis device 1, a first pressure gauge 24 is disposed between the first booster pump 23 and the first stage reverse osmosis device 1, a pressure switch 25 is disposed between the first pressure gauge 24 and the first booster pump 23, the first booster pump 23 is protected by the pressure switch 25, when the concentrated water pressure detected by the first pressure gauge 24 by the first stage reverse osmosis device 1 is less than a preset pressure, the pressure switch 25 controls the first booster pump 23 to operate, and increases the concentrated water pressure entering the first STRO membrane group 21, when the concentrated water pressure detected by the first pressure gauge 24 by the first stage reverse osmosis device 1 is not less than the preset pressure, the pressure switch 25 controls the first booster pump 23 to stop operating, and the concentrated water directly enters the first STRO membrane group 21, so as to prevent the first booster pump 23 from being damaged due to excessive water pressure.

In the above-described structure, as one of the embodiments, the first pressure transmitter 71 and the first flow transmitter 72 in the example of the utility model are specifically provided between the first booster pump 23 and the first STRO film group 21.

In the above structure, since the first STRO membrane set 21 and the second STRO membrane set 22 are disposed in the secondary reverse osmosis apparatus 2, in order to further determine whether the first STRO membrane set 21 or the second STRO membrane set 22 has a fault or a pollution, as one implementation manner, a second pressure sensor 77 is disposed between the first STRO membrane set 21 and the second STRO membrane set 22 in the embodiment of the present utility model, and the second pressure sensor 77 can detect the concentrated water pressure output through the first STRO membrane set 21.

In the above structure, as one implementation manner, a second pressure gauge 78 is further disposed between the water producing end of the second STRO membrane set 22 and the clean water tank in the embodiment of the present utility model; a third pressure gauge 79 is arranged between the concentrate end of the second STRO membrane set 22 and the concentrate tank, and the second pressure gauge 78 and the third pressure gauge 79 can display the operating pressure in real time, so that the operating condition of the secondary osmosis device 2 can be conveniently known.

In the above structure, as one of the embodiments, the first STRO film group 21 in the embodiment of the present utility model includes a plurality of first STRO film elements, and the plurality of first STRO film elements are connected in parallel, where the plurality herein refers to at least one.

In the above structure, as one of the embodiments, the second STRO film group 22 in the embodiment of the present utility model includes a plurality of second STRO film elements, and the plurality of second STRO film elements are connected in parallel, where the plurality herein refers to at least one.

In the above-described structure, as one of the embodiments, the cleaning device 5 according to the present utility model further includes the clean water flushing tank 56, the water replenishment pipe 57, and the chemical adding pipe 58, wherein the water replenishment pipe 57 is connected to the clean water flushing tank 56 and the RO cleaning tank 54, the chemical adding pipe 58 is connected to the clean water flushing tank 56 and the RO cleaning tank 54, the RO cleaning tank 54 is provided with the water return pipe 541 connected to the water producing end and the concentrated water end of the second STRO membrane group 22, the water return pipe 541 is provided with the water return valve 542, the water outlets of the clean water flushing tank 56 and the RO cleaning tank 54 are connected to the cleaning water pipe 52, the RO cleaning tank 54 is clean water to which the chemical is added, and the RO cleaning tank 54 is clean water to which the second reverse osmosis device 2 is recovered, and the second reverse osmosis device 2 can be reused by adding the chemical to the RO cleaning tank 54.

In the above-mentioned structure, since the water producing end and the concentrated water end of the secondary reverse osmosis apparatus 2 have different pollution levels, in order to facilitate the addition of the cleaning agent, as one embodiment, the RO cleaning water tanks 54 in the embodiment of the present utility model are provided with two, wherein the first RO cleaning water tank is communicated with the water producing end of the secondary reverse osmosis apparatus 2, and the second RO cleaning water tank is communicated with the concentrated water end of the secondary reverse osmosis apparatus 2.

In the above structure, as one of the embodiments, the cleaning device 5 according to the embodiment of the present utility model further includes a liquid level meter 591, a water replenishment valve 592, a cleaning valve 593, a thermometer, and a pH detector, wherein the liquid level meter 591 is disposed on the clean water flushing tank 56 and the RO cleaning tank 54, the water replenishment valve 592 is disposed on the water replenishment pipe 57, when the liquid level detected by the liquid level meter 591 is too low, the water replenishment valve 592 is opened, the clean water is replenished to a preset liquid level in the clean water flushing tank 56 and the RO cleaning tank 54, and the water replenishment valve 592 is closed. The cleaning valve 593 is disposed at the water outlet end of the clean water flushing tank 56 and the RO cleaning water tank 54, and the clean water flushing tank 56 and the RO cleaning water tank 54 can be opened or closed by the cleaning valve 593 to input cleaning water into the cleaning water pipe 52, and the thermometer and the pH detector are disposed on the RO cleaning water tank 54 for detecting the temperature and pH value of the cleaning water in the RO cleaning water tank 54.

In the above-described configuration, as one embodiment, the cleaning water pipe 52 in the embodiment of the present utility model is provided with the second booster pump.

In the above structure, as one implementation manner, the controller in the embodiment of the present utility model is respectively connected to the water replenishing valve 592 and the cleaning valve 593, and the automatic cleaning of the secondary reverse osmosis device 2 is realized by the controller, so that maintenance labor is saved.

Specifically, when the second-stage reverse osmosis device 2 is in water production, the controller turns off the first switch 61, the third switch 51, the fourth switch 53 and the fifth switch 55, turns on the second switch 62, the pressure switch 25 and the first booster pump 23, and the concentrated water output by the first-stage reverse osmosis device 1 enters the second-stage reverse osmosis device 2 to produce water, so that the water recycling rate is improved, and the concentrated water discharge amount is reduced; when the detected second-stage reverse osmosis device 2 needs to be cleaned, the controller closes the second switch 62, the pressure switch 25, the first booster pump 23, the water producing valve 63 and the regulating valve 64, stops the second-stage reverse osmosis device 2, the concentrated water at the concentrated water end of the first-stage reverse osmosis device 1 directly flows into the concentrated water tank 4, the controller opens the third switch 51, the fourth switch 53, the fifth switch 55, the water supplementing valve 592 and the cleaning valve 593, cleans the second-stage reverse osmosis device 2, the operation of the first-stage reverse osmosis device 1 is not affected in the cleaning process, after the cleaning time reaches the preset time, the first switch 61, the third switch 51, the fourth switch 53 and the fifth switch 55, the water supplementing valve 592 and the cleaning valve 593 are closed, and the second switch 62, the pressure switch 25, the first booster pump 23, the water producing valve 63 and the regulating valve 64 are opened, so that the second-stage reverse osmosis device 2 is started.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A reverse osmosis water treatment system comprising:

a first-stage reverse osmosis device (1);

the secondary reverse osmosis device (2) is connected with the concentrated water end of the primary reverse osmosis device (1), the water producing ends of the primary reverse osmosis device (1) and the secondary reverse osmosis device (2) are connected with the water purifying tank (3), and the concentrated water ends of the primary reverse osmosis device (1) and the secondary reverse osmosis device (2) are connected with the concentrated water tank (4);

a cleaning device (5) for cleaning the secondary reverse osmosis device (2);

a first switch (61) arranged between the primary reverse osmosis device (1) and the concentrate tank (4), and a second switch (62) arranged between the primary reverse osmosis device (1) and the secondary reverse osmosis device (2).

2. The reverse osmosis water treatment system of claim 1, wherein,

further comprises:

a water producing valve (63) arranged between the water producing end of the secondary reverse osmosis device (2) and the water purifying tank (3);

and the regulating valve (64) is arranged between the concentrated water end of the secondary reverse osmosis device (2) and the concentrated water tank (4).

3. The reverse osmosis water treatment system of claim 2, wherein,

the cleaning device (5) comprises:

a cleaning water pipe (52) connected with the water inlet end of the secondary reverse osmosis device (2) through a third switch (51);

and the RO cleaning water tank (54) is connected with the concentrated water end of the second-stage reverse osmosis device (2) through a fourth switch (53), and the RO cleaning water tank (54) is communicated with the water producing end of the second-stage reverse osmosis device (2) through a fifth switch (55).

4. The reverse osmosis water treatment system of claim 3, further comprising:

and the controller is respectively connected with the first switch (61), the second switch (62), the third switch (51), the fourth switch (53) and the fifth switch (55).

5. The reverse osmosis water treatment system of claim 4,

further comprises:

a first pressure transmitter (71) and a first flow transmitter (72) disposed between the primary reverse osmosis unit (1) and the secondary reverse osmosis unit (2);

a second pressure transmitter (73) and a second flow transmitter (74) arranged between the second-stage reverse osmosis unit (2) and the clean water tank (3);

wherein the controller is connected to the first pressure transmitter (71), the second pressure transmitter (73), the first flow transmitter (72) and the second flow transmitter (74), respectively.

6. The reverse osmosis water treatment system of claim 5,

further comprises:

a first pressure sensor (75) and a first flow sensor (76) arranged between the secondary reverse osmosis device (2) and the concentrate tank (4).

7. The reverse osmosis water treatment system according to any one of claims 1 to 6,

the secondary reverse osmosis device (2) comprises:

the first STRO membrane group (21) is connected with the concentrated water end of the first-stage reverse osmosis device (1), and the water producing end of the first STRO membrane group (21) is connected with the water purifying tank (3);

the second STRO membrane group (22) is connected with the concentrated water end of the first STRO membrane group (21), the water producing end of the second STRO membrane group (22) is connected with the water purifying tank (3), and the concentrated water end of the second STRO membrane group (22) is communicated with the concentrated water tank (4).

8. The reverse osmosis water treatment system of claim 7, wherein,

the secondary reverse osmosis device (2) further comprises:

a first booster pump (23) arranged between the first stage reverse osmosis device (1) and the first STRO membrane set (21);

the first pressure gauge (24) is arranged between the first booster pump (23) and the first reverse osmosis device (1), and a pressure switch (25) is arranged between the first pressure gauge (24) and the first booster pump (23).

9. The reverse osmosis water treatment system according to any one of claims 3 to 6,

the cleaning device (5) further comprises:

a clean water flushing tank (56);

a water supplementing pipe (57), wherein the water supplementing pipe (57) is respectively connected with the clean water flushing tank (56) and the RO cleaning water tank (54),

the dosing pipeline (58) is respectively connected with the clean water flushing tank (56) and the RO cleaning water tank (54);

the clean water flushing tank (56) and the water outlet of the RO cleaning water tank (54) are respectively connected with the cleaning water pipe (52).

10. The reverse osmosis water treatment system of claim 9, wherein,

the cleaning device (5) further comprises:

a level gauge (591) disposed on the clean water rinse tank (56) and the RO clean water tank (54);

a water replenishment valve (592) disposed between the water replenishment pipes (57);

a cleaning valve (593) arranged at the water outlet ends of the clean water flushing tank (56) and the RO cleaning water tank (54);

a thermometer and a pH detector disposed on the RO wash tank (54).