CN210786917U - Reverse osmosis device with reverse flow flushing function - Google Patents

Reverse osmosis device with reverse flow flushing function Download PDF

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Publication number
CN210786917U
CN210786917U CN201920846968.4U CN201920846968U CN210786917U CN 210786917 U CN210786917 U CN 210786917U CN 201920846968 U CN201920846968 U CN 201920846968U CN 210786917 U CN210786917 U CN 210786917U
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valve
reverse flow
membrane
pipeline
reverse osmosis
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CN201920846968.4U
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鲁杏君
叶建荣
陈普庆
吴政鑫
毛伟
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HANGZHOU SMART WATER TREATMENT ENGINEERING CO LTD
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HANGZHOU SMART WATER TREATMENT ENGINEERING CO LTD
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Abstract

The utility model provides a take reverse osmosis unit of backwash, this novel reverse osmosis unit is except that original water intaking valve, production row valve, the three program control valve of dense valve in the conventional reverse osmosis unit still have the automatic flush valve of segmentation backwash (including one section backwash valve, one section backwash discharge valve, one section backwash isolating valve, two-section backwash discharge valve, two-section backwash isolating valve) to constitute. Through shutting down the interconversion of these several valves of washing in-process to reverse osmosis unit and with the cooperation of reverse osmosis flush pump, not only can wash away the dense water of the higher salinity of reverse osmosis membrane dense water side, can also utilize the backwash principle, will block the pollutant in membrane terminal surface and membrane water inlet channel and wash totally, prevent that membrane water inlet channel is dirty stifled, the product yield descends. Thereby extending the useful life of the membrane. Is a practical and efficient new device for recycling and treating reclaimed water.

Description

Reverse osmosis device with reverse flow flushing function
Technical Field
The invention relates to a reverse osmosis device, and belongs to the technical field of sewage treatment.
Background
With the increasing environmental protection situation, industrial enterprises are all reducing the discharge of waste water as much as possible, and more water needs to be recycled. The reverse osmosis system is more and more favored by industrial enterprises as a core link in the water reuse treatment process. However, because of the limitation of the quality of the inlet water, the reverse osmosis system on the reclaimed water reuse is greatly influenced by the pretreatment, the cleaning period of the reverse osmosis membrane component is greatly shortened, and the service life is also shortened. In the past experience of membrane replacement, the first and second branch membrane modules in the first section of membrane of most of sewage recycling projects have the irreversible pollution and blockage phenomenon of a water inlet channel after being used for half a year to 1 year. The irreversible water inlet channel fouling phenomenon also appears after the subsequent membrane component is used for one and a half years to 2 years, so that the service life of the reverse osmosis membrane component is greatly influenced.
The traditional reverse osmosis device is stopped and washed, and only the concentrated water staying at the concentrated water side of the reverse osmosis membrane assembly can be replaced along the water flow direction of the system, so that pollutants deposited on the end face of the membrane and a membrane water inlet flow channel cannot be washed clean. But the pollutant in the membrane end surface and the water inlet flow channel is attached more compactly.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for tracking the current running situation of a reverse osmosis device in a reclaimed water recycling system in multiple industries, analyzing the pollution and blockage situation of a component after a membrane component is disassembled, and then innovating and optimizing the traditional reverse osmosis device, so that the current situations that the pollution and blockage of the reverse osmosis device in the reclaimed water recycling system are too fast and the service life of the membrane is too short can be effectively solved, and the service life of the reverse osmosis membrane is prolonged. The invention specifically comprises the following steps: the reverse osmosis device comprises a membrane component and a cleaning device, wherein the membrane component consists of a first membrane component and a second membrane component, the front end of the first membrane component is provided with the cleaning device with a water inlet valve, the rear end of the first membrane component is respectively connected with a water tank and the second membrane component through pipelines, the pipeline connected with the water tank is a production and discharge pipeline and is provided with a production and discharge valve, the rear end of the second membrane component is provided with the cleaning device, and the first membrane component and the second membrane component are respectively provided with two reverse washing devices.
Preferably, the method comprises the following steps: the backwashing device is composed of a backwashing pipeline with a backwashing discharge valve and a backwashing water inlet pipe with a backwashing valve, the front end of the first membrane component is provided with a backwashing pipeline, the pipeline of the first membrane component is provided with a section of backwashing discharge valve, the rear end of the first membrane component is provided with a section of backwashing water inlet pipeline, the pipeline of the first membrane component is provided with a section of backwashing valve, a section of backwashing isolating valve is arranged between the first membrane component and the second membrane component, the front end of the second membrane component is provided with a two-section backwashing pipeline, the pipeline of the second membrane component is provided with a two-section backwashing discharge valve, the rear end of the second membrane component is provided with a two-section backwashing pipeline, and the pipeline of.
Preferably, the method comprises the following steps: the two-section backwashing pipeline is also connected with a sewage pipeline, a sewage valve is arranged on the sewage pipeline, and a two-section backwashing isolating valve for isolation is also arranged between the two-section backwashing pipeline and the sewage pipeline.
A flushing pipeline is added to a section of concentrated water pipe of the reverse osmosis device, an automatic isolating valve is added to a section of concentrated water pipe to a section of pipeline, and an automatic discharging valve is added to a section of water inlet pipeline. A washing pipeline is added on the two sections of last concentrated water pipes, an automatic isolating valve is added on the concentrated water pipeline, and a discharge pipeline is added on the two sections of water inlet pipelines. The membrane is required to be washed in a reverse flow mode after the reverse osmosis system is shut down or operates for a period of time, at the moment, the one-section reverse-washing isolating valve can be closed, the one-section reverse-washing valve and the one-section reverse-washing discharge valve are opened, and the washing water pump is started. After washing for 3 minutes, the two-stage backwashing isolating valve is closed, and the two-stage backwashing valve and the two-stage backwashing discharge valve are opened. Closing the first-stage backwashing valve and the first-stage backwashing discharge valve. Rinsing for 2 minutes. Therefore, pollutants blocked in the end face of the membrane component and the membrane water inlet channel can be washed clean by washing, and the pollutants are prevented from staying on the end face of the membrane component and the water inlet channel for a long time to form irreversible pollution blocking.
Description of the drawings:
FIG. 1 is a programmed step table of the operation of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings: FIGS. 1-2 show: a reverse osmosis device 1 with counter-current washing comprises a membrane component 2 and a first cleaning device 3, wherein the membrane component consists of a first membrane component 4 and a second membrane component 5, the front end of the first membrane component 4 is provided with a second cleaning device 7 with a water inlet valve 6, the rear end of the first membrane component 4 is respectively connected with a water tank 8 and the second membrane component 5 through pipelines, the pipeline connected with the water tank 8 is a production and discharge pipeline 9 and is provided with a production and discharge valve 10, the rear end of the second membrane component 5 is provided with a third cleaning device 11, the first membrane component 4 and the second membrane component 5 are respectively provided with two counter-current washing devices 12, the counter-current washing devices 12 consist of a counter-current washing pipeline 14 with a counter-current washing discharge valve 13 and a counter-current washing water inlet pipe 16 with a counter-current washing valve 15, the front end of the first membrane component 4 is provided with a counter-current washing pipeline 17, the pipeline is provided with a section of a counter-current washing discharge valve 18, the pipeline is provided with a section of backwashing valve 20, a section of backwashing isolation valve 21 is arranged between the first membrane component 4 and the second membrane component 5, the front end of the second membrane component is provided with a second section of backwashing pipeline 22, the pipeline is provided with a second section of backwashing discharge valve 23, the rear end is provided with a second section of backwashing pipeline 24, the pipeline is provided with a second section of backwashing valve 25, the second section of backwashing pipeline 24 is also connected with a sewage pipeline 26, the sewage pipeline is provided with a sewage discharge valve 27, and a second section of backwashing isolation valve 28 for isolation is also arranged between the second section of backwashing pipeline and the sewage discharge pipeline.
The specific implementation mode is as follows: the method is influenced by the characteristics of the inlet water quality of a reclaimed water recycling system, the inlet water of the reclaimed water recycling system is generally pretreated industrial wastewater, the water contains colloidal substances which can not degrade organic matters and can not be thoroughly removed in pretreatment, residual biological cement, impurities penetrating through the pretreatment and the like. The water is pressurized by a high-pressure pump and then sequentially passes through the concentration of the first section 6 membrane components of the reverse osmosis device, when the water contacts the water inlet end surface of the first membrane, the water inlet flow channel is narrowed, most of undegraded organic matters, colloid, biological cement and impurities are deposited on the water inlet end surface and the water inlet flow channel due to the reduction of the flow speed, and after the water is operated for a long time, the water inlet end surface and the water inlet flow channel of the first membrane component are polluted and blocked by the substances, so that the water inlet flow channel is smaller and smaller, the water yield of the device is reduced, and the water inlet pressure is increased. If the treatment is not carried out, the dirt blocking substance is subjected to pressure to sequentially remove dirt and block the subsequent membrane module and the second-stage membrane module, and after the reverse osmosis device is stopped (a pump valve stop signal is in place), the first-stage backwashing valve, the first-stage backwashing discharge valve, the first-stage backwashing isolation valve and the reverse osmosis flushing pump are sequentially opened. First, a section of 6 membrane modules are washed in a countercurrent way for 3 minutes. And (3) cleaning pollutants and concentrated water with high salt content deposited on the end face of the first section of the membrane and in the water inlet flow channel in operation, opening a second-section backwashing valve, a second-section backwashing discharge valve and a second-section backwashing isolation valve in sequence after the first-section backwashing timing is finished, and starting timing for about 2 minutes after three valves of the first-section backwashing are closed. And (4) washing the pollutants and the concentrated water with high salt content deposited on the end surface of the two-section film and in the water inlet flow channel in operation.
As shown in the figure, a flushing pipeline is additionally arranged on a section of concentrated water pipe of the reverse osmosis device, an automatic isolating valve is additionally arranged on a section of concentrated water pipe from the first section to the second section, and an automatic discharging valve is additionally arranged on a section of water inlet pipeline. A washing pipeline is added on the two sections of last concentrated water pipes, an automatic isolating valve is added on the concentrated water pipeline, and a discharge pipeline is added on the two sections of water inlet pipelines. The membrane is required to be washed in a reverse flow mode after the reverse osmosis system is shut down or operates for a period of time, at the moment, the one-section reverse-washing isolating valve can be closed, the one-section reverse-washing valve and the one-section reverse-washing discharge valve are opened, and the washing water pump is started. After washing for 3 minutes, the two-stage backwashing isolating valve is closed, and the two-stage backwashing valve and the two-stage backwashing discharge valve are opened. Closing the first-stage backwashing valve and the first-stage backwashing discharge valve. Rinsing for 2 minutes. Therefore, pollutants blocked in the end face of the membrane component and the membrane water inlet channel can be washed clean by washing, and the pollutants are prevented from staying on the end face of the membrane component and the water inlet channel for a long time to form irreversible pollution blocking.

Claims (3)

1. The reverse osmosis device with the counter-current flushing function comprises a membrane component and a cleaning device, and is characterized in that the membrane component consists of a first membrane component and a second membrane component, the front end of the first membrane component is provided with the cleaning device with a water inlet valve, the rear end of the first membrane component is respectively connected with a water tank and the second membrane component through pipelines, the pipeline connected with the water tank is a production and discharge pipeline and is provided with a production and discharge valve, the rear end of the second membrane component is provided with the cleaning device, and the first membrane component and the second membrane component are respectively provided with two counter-current cleaning devices.
2. A reverse osmosis apparatus having a reverse flow washing function according to claim 1, wherein the reverse flow washing apparatus comprises a reverse flow washing pipeline having a reverse flow washing discharge valve and a reverse flow washing water inlet pipe having a reverse flow washing valve, the first membrane module has a reverse flow washing pipeline having a first reverse flow washing discharge valve provided thereon at a front end thereof and a first reverse flow washing water inlet pipeline provided thereon at a rear end thereof, the first reverse flow washing pipeline having a first reverse flow washing valve provided thereon, the first membrane module and the second membrane module have a first reverse flow washing isolation valve provided therebetween, the second membrane module has a second reverse flow washing pipeline having a second reverse flow washing discharge valve provided thereon at a front end thereof and a second reverse flow washing pipeline provided thereon at a rear end thereof, the second reverse flow washing pipeline having a second reverse flow washing valve provided thereon.
3. A reverse osmosis apparatus according to claim 2 wherein the second reverse flow wash down conduit is further connected to a blowdown conduit, the blowdown conduit being provided with a blowdown valve, and a second reverse flow wash down isolation valve for isolation being provided between the second reverse flow wash down conduit and the blowdown conduit.
CN201920846968.4U 2019-06-06 2019-06-06 Reverse osmosis device with reverse flow flushing function Active CN210786917U (en)

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CN201920846968.4U CN210786917U (en) 2019-06-06 2019-06-06 Reverse osmosis device with reverse flow flushing function

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Application Number Priority Date Filing Date Title
CN201920846968.4U CN210786917U (en) 2019-06-06 2019-06-06 Reverse osmosis device with reverse flow flushing function

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CN210786917U true CN210786917U (en) 2020-06-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112473374A (en) * 2020-11-06 2021-03-12 张梅 Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112473374A (en) * 2020-11-06 2021-03-12 张梅 Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function

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