CN110652882A - Flushing device and method for multi-section reverse osmosis membrane system - Google Patents
Flushing device and method for multi-section reverse osmosis membrane system Download PDFInfo
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- CN110652882A CN110652882A CN201910914162.9A CN201910914162A CN110652882A CN 110652882 A CN110652882 A CN 110652882A CN 201910914162 A CN201910914162 A CN 201910914162A CN 110652882 A CN110652882 A CN 110652882A
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 140
- 239000012528 membrane Substances 0.000 title claims abstract description 139
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 149
- 238000005406 washing Methods 0.000 claims abstract description 59
- 238000004140 cleaning Methods 0.000 claims abstract description 36
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 25
- 239000002351 wastewater Substances 0.000 claims description 24
- 239000012141 concentrate Substances 0.000 claims description 12
- 239000003344 environmental pollutant Substances 0.000 claims description 12
- 231100000719 pollutant Toxicity 0.000 claims description 12
- 239000013043 chemical agent Substances 0.000 claims description 10
- 239000003814 drug Substances 0.000 claims description 9
- 239000008213 purified water Substances 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000009285 membrane fouling Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/02—Forward flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
Abstract
The invention relates to a flushing device and a method for a multi-section reverse osmosis membrane system, wherein the flushing device comprises: a cleaning tank; the inlet of the flushing water pump is connected with the cleaning tank through a cleaning tank connecting pipeline; the two ends of the section of the front flushing pipeline are respectively connected with a washing water pump and a water inlet main pipe; the first end of the second-section intermediate pipeline is also connected with the outlet of the flushing water pump, and the second end of the second-section intermediate pipeline is respectively connected with the first-section water outlet pipeline and the second-section water inlet pipeline; the control valve group comprises a washing water pump valve arranged on a connecting pipeline of a washing water pump upstream washing pool, a two-section intermediate valve arranged on a two-section intermediate pipeline, a washing pipeline valve arranged on a section of front washing pipeline, a water inlet main pipe valve arranged on a water inlet main pipe, and a two-section washing valve arranged on a two-section water inlet pipeline. According to the invention, the problem that the first two membrane elements in the first section of membrane device of the multi-section reverse osmosis membrane system are seriously polluted is solved, the cleaning efficiency of the membrane elements is improved, and then the pollution problem of the whole multi-section reverse osmosis membrane system is relieved.
Description
Technical Field
The invention relates to a flushing device and a flushing method, in particular to a flushing device and a flushing method which are suitable for a multi-stage reverse osmosis membrane system polluted by organic matters, microorganisms, inorganic salts and the like.
Background
The reverse osmosis membrane has the characteristics of high desalination efficiency, small occupied area, environmental protection, wide application range, simple operation and the like, and is widely applied to tap water treatment, sewage deep treatment, seawater desalination, printing and dyeing, electroplating and other sewage purification. Because reverse osmosis is different from the traditional filtration mode, the traditional filtration mode can remove the intercepted pollutants from the filtration layer through backwashing of the filtration medium, and when the surface of the reverse osmosis membrane concentrates the pollutants such as salts, colloid, microorganism, organic matters and the like, concentrated substances are required to be taken away by virtue of concentrated water flowing in a direction parallel to the membrane. After the reverse osmosis membrane system is operated for a period of time, the problems of reduced desalination rate, reduced water yield, increased pressure difference and the like of the system can be caused by reverse osmosis membrane pollution.
Membrane fouling of reverse osmosis membrane systems is slow to develop and if measures are not taken early, the fouling will impair the performance of the membrane elements in a relatively short time. Generally, when the following phenomena occur in a reverse osmosis membrane system, indicating that the membrane element is contaminated, cleaning should be performed in time: firstly, under normal pressure, the water flow of a product is reduced by 10-15% of a normal value; secondly, in order to maintain normal product water flow, the water supply pressure is increased by 10-15%; and thirdly, the water and salt transmittance of the product is increased by 10-15%. These membrane fouling phenomena all reduce the water yield of the reverse osmosis membrane system, increase the water supply pressure, reduce the product water quality, and increase the cleaning frequency and water production cost of the reverse osmosis membrane system. Therefore, how to prevent or slow down the pollution of the reverse osmosis membrane, prolong the service life of the membrane and improve the cleaning effect of the membrane has become an important research direction in the current reverse osmosis technology.
In multistage reverse osmosis membrane system, when rivers were through two first membrane shells of first section membrane element, under the effect of water supply pressure, partly water when permeating reverse osmosis membrane, substance such as colloid, metallic oxide, bacterium, organic matter, incrustation scale can be accumulated to reverse osmosis membrane's dense water side, and two membrane shells are all serious than subsequent membrane shell in the front in membrane pollution, can cause single membrane element differential pressure to rise after the operation period, probably takes place telescope phenomenon even and cause the damage of membrane element physical structure. And traditional membrane washing mode sparge water gets into from one section membrane shell side of intaking, and the water flow direction is unanimous with the direction of intaking when moving, leads to washing effect not good, and anterior segment pollutant still can be washed back to the back end membrane element even, causes that follow-up component is dirty stifled, consequently needs a more effective washing mode.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a washing apparatus and method for a multi-stage reverse osmosis system, which can improve the efficiency of membrane element cleaning by solving the problem of serious pollution of the first two membrane elements in a one-stage membrane apparatus of the multi-stage reverse osmosis system, and then alleviate the pollution problem of the whole multi-stage reverse osmosis system.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a washing unit of multistage reverse osmosis membrane system, this multistage reverse osmosis membrane system include precision filter, high-pressure pump, one section membrane device and two sections membrane devices that connect gradually, and this washing unit includes: the cleaning tank is used for placing reverse osmosis product water; the inlet of the washing water pump is connected with the washing tank through a washing tank connecting pipeline; a first end of the section of the front flushing pipeline is connected with an outlet of the flushing water pump, and a second end of the section of the front flushing pipeline is connected with a main water inlet pipe positioned at the upstream of the precision filter; the first end of the second section of intermediate pipeline is also connected with the outlet of the flushing water pump, and the second end of the second section of intermediate pipeline is respectively connected with a first section of water outlet pipeline and a second section of water inlet pipeline through a tee joint; the control valve group comprises a washing water pump valve arranged on the washing pool connecting pipeline positioned at the upstream of the washing water pump, a two-section intermediate valve arranged on the two-section intermediate pipeline, a washing pipeline valve arranged on the front-arranged washing pipeline, a water inlet main pipe valve arranged on a water inlet main pipe positioned at the downstream of the high-pressure pump, and a two-section washing valve arranged on the two-section water inlet pipeline.
Preferably, the flushing device is characterized in that concentrated water side discharge ports of the first section of membrane device and the second section of membrane device are respectively connected with a first concentrated water side discharge pipeline and a second concentrated water side discharge pipeline, and the control valve group further comprises a first concentrated water side discharge valve and a second concentrated water side discharge valve which are respectively arranged on the first concentrated water side discharge pipeline and the second concentrated water side discharge pipeline.
The flushing device preferably further comprises a dosing device, the dosing device comprises a dosing tank, and the dosing tank is connected with the cleaning tank connecting pipeline through a dosing pump, a dosing pipeline and a dosing valve; and meanwhile, a front-mounted dosing flushing pipeline and a flushing valve are further arranged at the downstream of the two-section middle pipeline, the first end of the front-mounted dosing flushing pipeline is connected with an outlet of the flushing water pump, and the second end of the front-mounted dosing flushing pipeline is connected with a water inlet main pipe between the water inlet main pipe valve and one section of membrane device.
The flushing device is preferably provided with a static mixer on the cleaning pool connecting pipeline positioned at the downstream of the medicine feeding pipeline.
The flushing device is preferably provided with a sealing ring at two sides of each membrane element in the section of the membrane device.
A flushing method of a multi-stage reverse osmosis membrane system based on the flushing device comprises the following steps:
1) when the water is washed in the forward direction, the washing water pump valve, the washing pipeline valve, the water inlet main pipe valve and the second-section washing valve are opened, and the second-section intermediate valve is closed;
2) opening the flushing water pump, enabling flushing water to pass through the cleaning pool connecting pipeline and the flushing water pump from the cleaning pool, inputting the flushing water into a water inlet main pipe from the section of front flushing pipeline, enabling the flushing water to sequentially flush the section of membrane device and the section of membrane device after flowing through the precision filter and the high-pressure pump so as to flush pollutants adhered to the surfaces of membrane elements in the section of membrane device and the section of membrane device, replacing concentrated water in the section of membrane device and the section of membrane device into purified water, and enabling flushing wastewater to flow into a wastewater tank from a second concentrated water side discharge pipeline and a second concentrated water side discharge valve in the section of membrane device;
3) and carrying out reverse flushing after the forward flushing is finished, opening the two-section intermediate valve at the moment, closing the two-section cleaning valve, enabling the cleaning tank to pass through the cleaning tank connecting pipeline and the flushing water pump, enabling the cleaning water to sequentially flow into each membrane element of the one-section membrane device through the two-section intermediate pipeline, reversely flushing pollutants on the surface of each membrane element, bringing the pollutants out of a first membrane element of the one-section membrane device, and enabling the flushing wastewater to flow into a wastewater tank through the first concentrated water side discharge pipeline and the first concentrated water side discharge valve.
In the flushing method, preferably, when the operating pressure of the first-stage membrane device and/or the second-stage membrane device rises, the chemical feeding pump and the chemical feeding valve are opened, chemical agents with a certain concentration are fed into forward flushing water, the chemical agents are accurately metered by the chemical feeding box through the chemical feeding pump, then the chemical agents are input into the cleaning tank connecting pipeline through the chemical feeding pipeline, fully mixed through the static mixer, the flushing water pump is opened, flushing liquid medicine directly enters the first-stage membrane device through the preposed chemical feeding flushing pipeline and the flushing valve, and flushing wastewater flows into a wastewater tank through the first concentrated water side discharge pipeline and the first concentrated water side discharge valve in the first-stage membrane device.
In the flushing method, preferably, after the chemical flushing is completed, the chemical feeding valve is closed, the forward flushing in the step 2) is repeated, the flushing liquid medicine in the section of the membrane device is replaced into purified water, and the flushing wastewater flows into the wastewater tank through the first concentrated water side discharge pipeline and the first concentrated water side discharge valve.
The flushing method preferably comprises the steps of performing forward flushing and backward flushing once every 24H, wherein the flushing flow of a single membrane element is 9m3The flushing time is 15min, and the flushing pressure is lower than 0.05 MPa.
Preferably, the frequency of the chemical washing is set to be 7-15 days.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention provides a flushing device and a method of a multi-section reverse osmosis membrane system, aiming at the problems that in the fields of reverse osmosis treatment of surface water, advanced sewage treatment, industrial sewage recycling and the like, the first two membrane elements in a section of membrane device of the multi-section reverse osmosis membrane system generate serious pollution blockage phenomenon, and the pressure difference of a single membrane element is increased. 2. When the multi-stage reverse osmosis membrane system is used for reverse flushing, the first membrane element in the water inlet direction is positioned on the side closest to flushing and draining, so that dirt and blockage accumulated in the multi-stage reverse osmosis membrane system can be flushed out of the multi-stage reverse osmosis membrane system more easily by flushing water, the flushing effect is improved, and the stable operation period of the multi-stage reverse osmosis membrane system is prolonged.
Drawings
FIG. 1 is a schematic view of the structure of a flushing device according to the present invention;
FIG. 2 is a schematic structural view of the flushing device of the present invention with an additional drug-adding device.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1, the present invention provides a washing apparatus for a multi-stage reverse osmosis membrane system, which comprises a precision filter a, a high pressure pump b, a first stage membrane apparatus c, and a second stage membrane apparatus d, which are connected in sequence, the washing apparatus comprising: the cleaning tank 1 is used for placing reverse osmosis product water; the inlet of the washing water pump 3 is connected with the washing tank 1 through a washing tank connecting pipeline 2; a section of the front flushing pipeline 4, wherein the first end of the section of the front flushing pipeline 4 is connected with an outlet of the flushing water pump 3, and the second end of the section of the front flushing pipeline 4 is connected with a main water inlet pipe positioned at the upstream of the precision filter a; the first end of the first-second-section intermediate pipeline 5 is also connected with the outlet of the flushing water pump 3, and the second end of the first-second-section intermediate pipeline 5 is respectively connected with a first-section water outlet pipeline and a second-section water inlet pipeline through a tee; and the control valve group comprises a washing water pump valve 7 arranged on the connecting pipeline 2 of the upstream washing pool of the washing water pump 3, a second intermediate valve 8 arranged on the second intermediate pipeline 5, a washing pipeline valve 9 arranged on the front washing pipeline 4, a water inlet main pipe valve 10 arranged on a water inlet main pipe positioned at the downstream of the high-pressure pump b, and a second washing valve 11 arranged on the second water inlet pipeline.
In the above embodiment, it is preferable that the concentrate side discharge ports of the first-stage membrane device c and the second-stage membrane device d are connected with the concentrate side discharge pipes 6 and 22, respectively.
In the above embodiment, it is preferable that the control valve group further includes the rich water side drain valves 12 and 13 provided on the rich water side drain pipes 6 and 22, respectively.
In the above embodiment, preferably, as shown in fig. 2, the flushing device further comprises a dosing device, the dosing device comprises a dosing tank 15, the dosing tank 15 is connected with the cleaning tank connecting pipeline 2 through a dosing pump 16, a dosing pipeline 17 and a dosing valve 18; meanwhile, a preposed medicine-adding flushing pipeline 20 and a flushing valve 21 are further arranged at the downstream of the second-section middle pipeline 5, the first end of the preposed medicine-adding flushing pipeline 20 is connected with an outlet of the flushing water pump 3, the second end of the preposed medicine-adding flushing pipeline 20 is connected with a water inlet main pipe between the water inlet main pipe valve 10 and the first-section membrane device c, and therefore liquid medicine directly enters the first-section membrane device c through the preposed medicine-adding flushing pipeline 20 and the flushing valve 21.
In the above embodiment, it is preferable that a static mixer 19 for sufficiently mixing the reverse osmosis product water and the chemical is further provided on the cleaning tank connection pipe 2 located downstream of the chemical feeding pipe 17.
In the above embodiment, it is preferable that the membrane elements in one membrane device c are each provided with a sealing ring 14 on both sides, thereby ensuring that the inlet water on either side can only enter from the membrane leaf sections of the membrane elements, so that the forward flushing and the backward flushing can be performed alternately.
Based on the flushing device of the multi-stage reverse osmosis membrane system provided by the embodiment, the invention also provides a flushing method of the multi-stage reverse osmosis membrane system, which comprises the following steps:
1) when the water is washed in the forward direction, the washing water pump valve 7, the washing pipeline valve 9, the water inlet main pipe valve 10 and the second-stage washing valve 11 are opened, and the second-stage intermediate valve 8 is closed;
2) a flushing water pump 3 is started, flushing water passes through a cleaning tank connecting pipeline 2 and the flushing water pump 3 from a cleaning tank 1, is input into a water inlet main pipe from a section of preposed flushing pipeline 4, flows through a precision filter a and a high-pressure pump b and then sequentially flushes a section of membrane device c and a section of membrane device d so as to flush out pollutants such as organic matters, microorganisms and inorganic scaling substances adhered to the surfaces of membrane elements in the section of membrane device c and the section of membrane device d, concentrated water in the section of membrane device c and the section of membrane device d is replaced into purified water, and flushing wastewater flows into a wastewater tank from a concentrated water side discharge pipeline 22 and a concentrated water side discharge valve 13 in the section of membrane device d;
3) the back flush is carried out after the forward flush is finished, at the moment, the second section intermediate valve 8 is opened, the second section cleaning valve 11 is closed, the flushing water flows into each membrane element of the first section membrane device c in sequence through the cleaning pool connecting pipeline 2 and the flushing water pump 3 by the cleaning pool 1 and the second section intermediate pipeline 5, pollutants on the surface of each membrane element are back flushed, the pollutants are taken out of the first membrane element of the first section membrane device c, and the flushing wastewater flows into the wastewater pool through the concentrated water side discharge pipeline 6 and the concentrated water side discharge valve 12.
In the above embodiment, preferably, when the operating pressure of the first-stage membrane device c and/or the second-stage membrane device d rises, the chemical feeding pump 16 and the chemical feeding valve 18 are opened, chemical agents (non-oxidizing bactericides, hydrochloric acid, sodium hydroxide, or the like) with a certain concentration are fed into the forward flushing water, the chemical agents are accurately metered by the chemical feeding tank 15 through the chemical feeding pump 16, the chemical agents are fed into the cleaning tank connecting pipeline 2 through the chemical feeding pipeline 17, the chemical agents are fully mixed by the static mixer 19, the flushing water pump 3 is opened, the flushing chemical agents directly enter the first-stage membrane device c through the pre-feeding flushing pipeline 20 and the flushing valve 21, and the flushing wastewater flows into the wastewater tank through the concentrated water side discharge pipeline 6 and the concentrated water side discharge valve 12 in the first-stage membrane device c.
In the above embodiment, preferably, after the chemical flushing is completed, the chemical adding valve 18 is closed, the forward flushing mode of step 2 needs to be repeated, the flushing chemical in the first membrane device c is replaced into purified water, and the flushing wastewater flows into the wastewater tank through the concentrated water side discharge pipeline 6 and the concentrated water side discharge valve 12.
In the above embodiment, it is preferable that the forward flushing and the reverse flushing are performed each 24H, and the flushing flow rate of the single membrane element is 9m3The flushing time is 15min, and the flushing pressure is lower than 0.05 MPa.
In the above embodiment, preferably, the frequency of the chemical rinsing may be set to 7 to 15 days.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art should understand that the technical solutions of the present invention can still be modified or replaced with equivalents, but these modifications or equivalents do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The utility model provides a washing unit of multistage reverse osmosis membrane system, this multistage reverse osmosis membrane system is including precision filter (a), high-pressure pump (b), one section membrane device (c) and two sections membrane device (d) that connect gradually, and its characterized in that, this washing unit includes:
the cleaning pool (1) is used for placing reverse osmosis product water;
the inlet of the washing water pump (3) is connected with the washing pool (1) through a washing pool connecting pipeline (2);
a section of pre-flushing pipeline (4), wherein the first end of the section of pre-flushing pipeline (4) is connected with the outlet of the flushing water pump (3), and the second end of the section of pre-flushing pipeline (4) is connected with a main water inlet pipe positioned at the upstream of the precision filter (a);
the first end of the second section middle pipeline (5) is also connected with the outlet of the flushing water pump (3), and the second end of the second section middle pipeline (5) is respectively connected with a first section water outlet pipeline and a second section water inlet pipeline through a tee;
the control valve group comprises a washing water pump valve (7) arranged on the upstream of the washing water pump (3) on the washing pool connecting pipeline (2), a two-section intermediate valve (8) arranged on the two-section intermediate pipeline (5), a washing pipeline valve (9) arranged on the front-arranged washing pipeline (4), a water inlet main pipe valve (10) arranged on the water inlet main pipe on the downstream of the high-pressure pump (b), and a two-section washing valve (11) arranged on the two-section water inlet pipeline.
2. The flushing device according to claim 1, characterized in that a first concentrate side discharge conduit (6) and a second concentrate side discharge conduit (22) are connected to the concentrate side discharge ports of the first stage membrane device (c) and the second stage membrane device (d), respectively, and the control valve group further comprises a first concentrate side discharge valve (12) and a second concentrate side discharge valve (13) provided on the first concentrate side discharge conduit (6) and the second concentrate side discharge conduit (22), respectively.
3. The flushing device according to claim 2, characterized in that it further comprises a dosing device, said dosing device comprising a dosing tank (15), said dosing tank (15) being connected to said washing tank connection pipe (2) by means of a dosing pump (16), a dosing pipe (17) and a dosing valve (18); simultaneously, the low reaches of pipeline (5) still are provided with leading medicine washing pipeline (20) and flush valve (21) in the middle of a two-section, the first end of leading medicine washing pipeline (20) is connected the export of washing water pump (3), the second end of leading medicine washing pipeline (20) is connected the main pipe of intaking between water main pipe valve (10) and one section membrane device (c) of intaking is responsible for.
4. The flushing device according to claim 3, characterized in that a static mixer (19) is also provided on the cleaning tank connection pipe (2) downstream of the dosing pipe (17).
5. A flushing device according to claim 1, characterized in that a sealing ring (14) is mounted on both sides of each membrane element in the length of membrane device (c).
6. A method of flushing a multi-stage reverse osmosis membrane system based on the flushing device of claim 4, comprising the steps of:
1) when the water is washed in the forward direction, the washing water pump valve (7), the washing pipeline valve (9), the water inlet main pipe valve (10) and the second-stage washing valve (11) are opened, and the second-stage intermediate valve (8) is closed;
2) opening the flushing water pump (3), inputting flushing water from the cleaning pool (1) to a water inlet main pipe through the cleaning pool connecting pipeline (2) and the flushing water pump (3), flushing the first section of membrane device (c) and the second section of membrane device (d) in sequence after the flushing water flows through the precision filter (a) and the high-pressure pump (b) so as to flush away pollutants adhered to the surfaces of membrane elements in the first section of membrane device (c) and the second section of membrane device (d) and replace concentrated water in the first section of membrane device (c) and the second section of membrane device (d) into purified water, and enabling flushing wastewater to flow into a wastewater pool through the second concentrated water side discharge pipeline (22) and the second concentrated water side discharge valve (13) in the second section of membrane device (d);
3) and carrying out reverse flushing after the forward flushing is finished, opening the second-section intermediate valve (8), closing the second-section cleaning valve (11), enabling the cleaning tank (1) to pass through the cleaning tank connecting pipeline (2) and the cleaning water pump (3) and the second-section intermediate pipeline (5) to sequentially flow into each membrane element of the first-section membrane device (c), reversely flushing pollutants on the surface of each membrane element and bringing the pollutants out of the first membrane element of the first-section membrane device (c), and enabling the flushing wastewater to flow into a wastewater tank through the first concentrated water side discharge pipeline (6) and the first concentrated water side discharge valve (12).
7. The method of claim 6, wherein the dosing pump (16) and the dosing valve (18) are opened when the operating pressure of the one-stage membrane device (c) and/or the two-stage membrane device (d) rises, chemical agents with certain concentration are added into the forward flushing water, after the chemical agents are accurately metered by the dosing tank (15) through the dosing pump (16), is input into the cleaning pool connecting pipeline (2) through the medicine adding pipeline (17), and after fully mixing through the static mixer (19), the flushing water pump (3) is opened, flushing liquid medicine directly enters the section of membrane device (c) through the preposed medicine-adding flushing pipeline (20) and the flushing valve (21), and flushing wastewater flows into a wastewater tank through the first concentrated water side discharge pipeline (6) and the first concentrated water side discharge valve (12) in the section of membrane device (c).
8. A method of flushing according to claim 7 wherein after completion of the chemical flushing, the dosing valve (18) is closed and the forward flushing of step 2) is repeated to displace the flushing liquid in the length of membrane means (c) into purified water, the flushing waste water flowing into the waste water tank through the first concentrate side discharge conduit (6) and the first concentrate side discharge valve (12).
9. The method according to claim 6, wherein the forward flushing and the reverse flushing are performed every 24H, and the flushing flow rate of the single membrane element is 9m3The flushing time is 15min, and the flushing pressure is lower than 0.05 MPa.
10. The rinsing method according to claim 6, wherein the frequency of the chemical rinsing is set to 7 to 15 days once.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910914162.9A CN110652882A (en) | 2019-09-25 | 2019-09-25 | Flushing device and method for multi-section reverse osmosis membrane system |
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| CN201910914162.9A CN110652882A (en) | 2019-09-25 | 2019-09-25 | Flushing device and method for multi-section reverse osmosis membrane system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252852A (en) * | 2021-06-04 | 2021-08-13 | 金科环境股份有限公司 | Flocculant performance evaluation and inspection equipment and method |
| CN115228298A (en) * | 2022-07-19 | 2022-10-25 | 金科环境股份有限公司 | Rolled membrane system and gas-liquid two-phase cleaning method thereof |
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