Reverse osmosis membrane device flushing recovery system

Abstract

The utility model discloses a reverse osmosis membrane device flushing recovery system which comprises a reverse osmosis membrane device, a flushing water inlet of the reverse osmosis membrane device is connected with a pipeline mixer through a pipeline, the pipeline mixer is connected with a flushing water pump through a pipeline, an acid dosing device and an alkali dosing device are arranged between the flushing water pump and the pipeline mixer, and the flushing water pump is connected with a recycling water tank through a pipeline. The flushing recovery system for the reverse osmosis membrane device is reasonable in structural design, simple in system structure and easy to control and operate; the element performance restorability is good, and the service life is doubled; the chemical cleaning period is prolonged by more than two times; the discharge amount of the waste cleaning fluid is reduced by more than 50%; the shutdown frequency of the reverse osmosis device is reduced, and the chemical cleaning cost, the operation cost and the personnel cost of the system are saved.

Description

Technical Field

[0001] This utility model relates to a flushing and recovery system for a reverse osmosis membrane device. Background Technology

[0002] With the continuous development of industry and the improvement of people's living standards, the wastewater generated has far exceeded the environment's carrying capacity. Wastewater can be classified according to its source as: municipal sewage, industrial wastewater, treated effluent meeting discharge standards, and general wastewater. Currently, one of the main wastewater recycling units in my country is the reverse osmosis membrane unit and the nanofiltration membrane unit. During their application, these units inevitably encounter problems such as microbial fouling, organic fouling, colloidal fouling, and scaling fouling. Existing technologies prevent fouling by adding scale inhibitors and non-oxidizing bactericides to delay scaling and microbial fouling; simultaneously, during the shutdown / startup of the reverse osmosis and nanofiltration units, the units are simply flushed with reverse osmosis permeate. Fouling is treated by online or offline chemical cleaning. Under current operating conditions, the cleaning cycle for reverse osmosis and nanofiltration units in desalination systems is approximately 3 months; in reclaimed water systems, it is 1-2 months; and in zero-discharge systems, it is approximately 10 days. It severely affects the normal operation time of reverse osmosis and nanofiltration devices and enterprise water systems, and has poor cleaning effect and poor component performance recovery. Utility Model Content

[0003] This invention overcomes the shortcomings of existing technologies and provides a reverse osmosis membrane device flushing and recovery system.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a reverse osmosis membrane device flushing and recovery system, comprising:

[0005] Reverse osmosis membrane unit;

[0006] The feature is that a pipeline mixer is connected to the flushing inlet of the reverse osmosis membrane device via a pipeline, the pipeline mixer is connected to a flushing water pump via a pipeline, an acid dosing device and an alkali dosing device are provided between the flushing water pump and the pipeline mixer, and the flushing water pump is connected to a recycled water tank via a pipeline.

[0007] In the above structure, the acid dosing device is connected to a first dosing pump via a pipeline, and the first dosing pump is connected to the pipeline mixer via a pipeline.

[0008] In the above structure, the alkali dosing device is connected to a second dosing pump via a pipeline, and the second dosing pump is connected to the pipeline mixer via a pipeline.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: the reverse osmosis membrane device flushing and recovery system of this utility model has a reasonable structural design, a simple system structure, and is easy to control and operate; the component performance has good recovery and the service life is extended by 1 time; the chemical cleaning cycle is extended by more than 2 times; the waste cleaning liquid discharge is reduced by more than 50%; the downtime frequency of the reverse osmosis device is reduced, and the system chemical cleaning cost, operating cost and personnel cost are saved. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a reverse osmosis membrane device flushing and recovery system according to an embodiment of the present invention.

[0011] In the picture:

[0012] 1. Reverse osmosis membrane unit; 2. Pipeline mixer; 3. Flushing water pump; 4. Acid dosing device; 5. Alkali dosing device; 6. Reclaimed water tank; 7. First dosing pump; 8. Second dosing pump. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0014] like Figure 1 As shown, a reverse osmosis membrane device flushing and recovery system includes:

[0015] Reverse osmosis membrane unit 1;

[0016] The feature is that: a pipeline mixer 2 is connected to the flushing inlet of the reverse osmosis membrane device 1 via a pipeline, the pipeline mixer 2 is connected to a flushing water pump 3 via a pipeline, an acid dosing device 4 and an alkali dosing device 5 are provided between the flushing water pump 3 and the pipeline mixer 2, and the flushing water pump 3 is connected to a recycled water tank 6 via a pipeline.

[0017] In the above structure, the acid dosing device 4 is connected to a first dosing pump 7 via a pipeline, and the first dosing pump 7 is connected to the pipeline mixer 2 via a pipeline.

[0018] In the above structure, the alkali dosing device 5 is connected to a second dosing pump 8 via a pipeline, and the second dosing pump 8 is connected to the pipeline mixer 2 via a pipeline.

[0019] In practical operation, the reverse osmosis membrane device flushing and recovery system of this utility model allows the outlet of the pipeline mixer to be connected to either the flushing inlet or outlet of the reverse osmosis membrane device, and it can also be applied to nanofiltration membrane devices. The qualified flushing water in the recycled water tank is pumped by the flushing water pump and enters the pipeline mixer. The acid dosing device (or alkali dosing device) uses a first dosing pump (or a second dosing pump) to pump the reagent to the pipeline mixer, where it is thoroughly mixed with the qualified flushing water before entering the reverse osmosis membrane device for flushing and soaking. The control sequence for the reverse osmosis membrane device is: flushing → operation → acid dosing flushing → soaking → flushing → operation → alkali dosing flushing → soaking → flushing → operation, in a cycle. The system has a simple structure and is easy to control and operate; the components have good performance recovery and their service life is doubled; the chemical cleaning cycle is extended by more than double; the waste cleaning liquid discharge is reduced by more than 50%; the frequency of reverse osmosis membrane device downtime is reduced, saving system chemical cleaning costs, operating costs, and personnel costs.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A reverse osmosis membrane device flushing recovery system, comprising: a reverse osmosis membrane device (1); characterized in that a pipeline mixer (2) is connected through a pipeline at the flushing water inlet of the reverse osmosis membrane device (1), the flushing water pump (3) is connected through a pipeline with the pipeline mixer (2), an acid dosing device (4) and an alkali dosing device (5) are arranged between the flushing water pump (3) and the pipeline mixer (2), and the flushing water pump (3) is connected through a pipeline with the recycled water tank (6).

2. The reverse osmosis membrane device flush recovery system of claim 1, wherein: The acid dosing device (4) is connected through a pipeline with the first dosing pump (7), and the first dosing pump (7) is connected through a pipeline with the pipeline mixer (2).

3. The reverse osmosis membrane device flush recovery system of claim 1, wherein: The alkali dosing device (5) is connected through a pipeline with the second dosing pump (8), and the second dosing pump (8) is connected through a pipeline with the pipeline mixer (2).

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