CN114314878A - Water treatment system by reverse osmosis membrane method - Google Patents
Water treatment system by reverse osmosis membrane method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 272
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 153
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- B01D61/026—Reverse osmosis; Hyperfiltration comprising multiple reverse osmosis steps
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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
- B01D61/04—Feed pretreatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/2649—Filtration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model relates to a reverse osmosis membrane method water treatment technical field especially relates to a reverse osmosis membrane method water treatment system, including the water treatment module, the water treatment module includes a plurality of reverse osmosis membrane components, and follows concentrated water flow is to, a plurality of in the water treatment module the influent stream of reverse osmosis membrane component becomes little, effective membrane area grow, the membrane page becomes many, the water yield becomes high, the permeability becomes high, the antipollution weakens. So set up, rationalize the overall arrangement through reverse osmosis membrane element for system's rate of recovery improves, and system pollution rate reduces, improves membrane system stability and continuity, has prolonged the life of membrane element, has reduced the fortune dimension cost of membrane system.
Description
Technical Field
The application relates to the technical field of water treatment by a reverse osmosis membrane method, in particular to a water treatment system by the reverse osmosis membrane method.
Background
In recent 20 years, the application of domestic separation membrane water treatment technology represented by reverse osmosis is rapidly popularized; the phenomenon is beneficial to the improvement of national economic strength, the requirement of higher industrial level and the improvement of the self level of the membrane technology, and is promoted by factors such as environmental water pollution, gradual water source exhaustion and the like, at present, the technology becomes a mainstream process for water depth processing or sewage and wastewater recycling treatment in a plurality of industrial industries such as chemical industry, electric power, metallurgy, electronics, pharmacy, food, beverage, direct drinking water and the like, and starts to enter the fields of municipal water supply and municipal sewage treatment. The membrane process technology represented by reverse osmosis is widely applied to various fields such as pure water and ultrapure water preparation, reclaimed water and sewage and wastewater reuse, seawater and brackish water desalination and the like, and simultaneously, a novel membrane method water treatment industry which takes the reverse osmosis membrane technology as a core and keeps high-speed development is gradually formed.
The water resource shortage and water pollution situation in China are becoming more severe day by day, the reverse osmosis technology is widely popularized and applied in the fields of deep water supply processing treatment, reclaimed water and sewage resource treatment, concentrated water reprocessing and the like, and is well known, so the research and development of a new reverse osmosis membrane method treatment technology becomes an important development direction, and for various reasons, the reverse osmosis membrane separation technology has the following limitations in practical application, particularly high-concentration wastewater treatment:
(1) the system recovery rate is low, the waste of water resources is serious, and zero discharge and deep reprocessing of concentrated water are difficult to realize;
(2) the system is easy to block and scale, the running performance cannot be ensured to be continuous, and the chemical cleaning is frequent, so that the operating and environmental cost is increased rapidly;
(3) the service life of the membrane element is 50 percent shorter or even shorter than that of the water purification field, and the membrane replacement cost is increased;
(4) the operation cost is high, and the operation cost comprises items such as depreciation of equipment and parts, water, electricity, medicine, steam, warm, manpower, environment and the like.
It can be seen that, in the fields of deep water supply processing, reclaimed water and sewage resource processing, concentrated water reprocessing and the like, the pollution and low recovery rate of a system in the reverse osmosis membrane treatment technology are two biggest problems in the application of a reverse osmosis system.
At present, in the fields of feed water deep processing treatment, reclaimed water and sewage resource treatment, concentrated water reprocessing and the like, the system pollution resistance and the recovery rate are improved by selecting an anti-pollution membrane element.
The method for improving the anti-pollution performance of the membrane element is mainly carried out by enhancing the hydrophilicity of a material, reducing the surface roughness of the membrane, adjusting the charge neutralization of the surface of the membrane, changing the thickness of a water supply flow channel, changing the shape of a water supply separation net, an included angle, increasing the number of the membrane, shortening the water production stroke and the like.
However, even if the anti-pollution membrane element is used, the phenomena of low system recovery rate and membrane fouling are inevitably generated, the problems of low recovery rate and membrane fouling are determining factors influencing the technical stability, and the fouling and low recovery rate are one of the reasons for causing high running cost of some systems.
Therefore, how to solve the problems of low recovery rate and serious membrane fouling in the existing water treatment system is a key technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the present application aims to provide a reverse osmosis membrane water treatment system, which can solve the problems of low recovery rate and serious membrane fouling in the existing water treatment system. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.
The application provides a reverse osmosis membrane method water treatment system, including the water treatment module, the water treatment module includes a plurality of reverse osmosis membrane components, and follows concentrated water flow is to, a plurality of in the water treatment module the inhalant canal of reverse osmosis membrane component diminishes, effective membrane area grow, the membrane page becomes many, the water yield becomes high, the permeability becomes high, the pollution resistance weakens.
Preferably, the water treatment module comprises a reverse osmosis membrane shell with N sections, and the plurality of reverse osmosis membrane elements comprise a first membrane element, a second membrane element and a third membrane element which are arranged in the reverse osmosis membrane shell, wherein N is a positive integer greater than zero;
when N is equal to 1, arranging the first membrane element at the position, close to the water inlet end, of one section of the reverse osmosis membrane shell, arranging the second membrane element in the middle of the reverse osmosis membrane shell, and arranging the third membrane element at the position, close to the water outlet end, of one section of the reverse osmosis membrane shell;
when N is 2, the first membrane element is arranged at the position, close to the water inlet end, of one section of reverse osmosis membrane shell, the second membrane element is arranged at the position, close to the water outlet end, of one section of reverse osmosis membrane shell, and the third membrane element is arranged at the position, close to the water outlet end, of the second section of reverse osmosis membrane shell;
and when N is 3, the first membrane element is arranged on one section of reverse osmosis membrane shell, the second membrane element is arranged on the second section of reverse osmosis membrane shell, and the third membrane element is arranged on the third section of reverse osmosis membrane shell.
Preferably, the models of the first membrane element, the second membrane element and the third membrane element are SNBW-8040-FR280/56, SNBW-8040-FR365/36 and SNBW-XFR400/34 respectively.
Preferably, six reverse osmosis membrane elements are arranged in the reverse osmosis membrane shell.
Preferably, the water treatment module includes one section reverse osmosis membrane shell and two-stage section reverse osmosis membrane shell, the end of intaking of one section reverse osmosis membrane shell with the system intake intercommunication, the dense water end with the end intercommunication of intaking of two-stage section reverse osmosis membrane shell, produce water end and system and produce water and go out water intercommunication, the product water end intercommunication of two-stage section reverse osmosis membrane shell the system is produced water and is gone out water, dense water end intercommunication the end of intaking and the system dense water of one section reverse osmosis membrane shell are gone out water.
Preferably, the water inlet end of the first section of reverse osmosis membrane shell and the system concentrated water outlet are communicated with the concentrated water end of the first section of reverse osmosis membrane shell, and the system water inlet is communicated with the water inlet end of the second section of reverse osmosis membrane shell.
Preferably, the end of intaking of one section reverse osmosis membrane shell is provided with the online conductivity meter that is used for the concentrated multiple of control salinity, the concentrate end of one section reverse osmosis membrane shell with set up the booster pump between the end of intaking of two-stage segment reverse osmosis membrane shell, the concentrate end of one section reverse osmosis membrane shell the concentrate end of two-stage segment reverse osmosis membrane shell the end of intaking of one section reverse osmosis membrane shell with set up the circulating pump between the system concentrate goes out the water.
Preferably, the water inlet end of the first section of reverse osmosis membrane shell is communicated with the water production tank.
Preferably, the water inlet end, the water production end and the concentrated water end of the first section of reverse osmosis membrane shell and the second section of reverse osmosis membrane shell are communicated with a cleaning water tank.
Preferably, a water inlet pump, a cartridge filter and a high-pressure pump are sequentially communicated between the system water inlet and the section of the reverse osmosis membrane shell.
The technical scheme provided by the application can comprise the following beneficial effects:
because the wider the water inlet flow channel, the stronger the anti-pollution performance of the membrane element and the lower the pressure drop of the membrane element, but the membrane element with the same size has a larger concentrated water flow channel, the membrane area of the membrane element can be reduced, if the concentrated water flow channel is simply increased without limitation, the whole water yield of the membrane element can be reduced, so in the installation design of the membrane element, the whole membrane area and the water yield need to be considered, so aiming at the problem that the former membrane elements of the system are easy to be polluted and blocked, the water inlet flow channels with different widths and the gradual change type installation arrangement are adopted, the membrane element with the extremely wide flow channel, the small membrane area, the small membrane pages and the low water yield and the low permeability and the strong anti-pollution performance is adopted at the water inlet end, the membrane element with the wide flow channel, the large membrane area, the multiple membrane pages and the high water yield is adopted at the tail end, so that the water yield flux distribution of the whole system is even, the hydraulic balance is better realized, and the membrane element starts from the water inlet end, the water production of the membrane element is increased in sequence, the width of the water inlet flow channel is reduced in a gradual shrinkage mode, the water production of the system is improved to the maximum degree while the pollution blockage and the energy consumption are effectively reduced, and meanwhile the early-stage investment cost can be reduced.
So set up, rationalize the overall arrangement through reverse osmosis membrane element for system's rate of recovery improves, and system pollution rate reduces, improves membrane system stability and continuity, has prolonged the life of membrane element, has reduced the fortune dimension cost of membrane system.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of the present reverse osmosis membrane process water treatment system, according to some exemplary embodiments;
FIG. 2 is a first schematic diagram illustrating a high recovery and high yield mode, according to some exemplary embodiments;
FIG. 3 is a second schematic diagram illustrating a high recovery and high yield mode, according to some exemplary embodiments;
FIG. 4 is a first schematic illustration of a first intermittent low recovery low water production mode, shown in accordance with some exemplary embodiments;
FIG. 5 is a second schematic diagram illustrating a first intermittent low recovery and low water production mode, according to some exemplary embodiments;
FIG. 6 is a schematic diagram illustrating a second intermittent low recovery and low water production mode according to some exemplary embodiments;
FIG. 7 is a first schematic diagram illustrating an intermittent start-stop flush mode according to some exemplary embodiments;
FIG. 8 is a second schematic diagram illustrating an intermittent start-stop flush mode according to some exemplary embodiments;
FIG. 9 is a first schematic diagram illustrating a batch non-stop single-segment online cyclical maintenance purge mode in accordance with certain exemplary embodiments;
FIG. 10 is a second schematic illustration of a batch non-stop single-segment online cyclical maintenance purge mode shown in accordance with some exemplary embodiments;
FIG. 11 is a schematic diagram illustrating an intermittent shutdown online cycle recovery purge mode according to some exemplary embodiments.
In the figure: 1. a water inlet pump; 2. a cartridge filter; 3. a high pressure pump; 4. a circulation pump; 5. a booster pump.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus or methods consistent with aspects of the present application.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
Referring to fig. 1 to 11, the present embodiment provides a water treatment system using reverse osmosis membrane, which includes a water treatment module having a plurality of reverse osmosis membrane elements disposed therein for reverse osmosis filtration of water to be treated. Specifically, the water treatment module may be designed in a first-stage design, a first-stage second-stage design or a first-stage third-stage design, i.e., the water treatment module may have a first-stage reverse osmosis membrane shell.
Wherein, along the concentrated water flow direction in the water treatment module, the water inlet flow channels of the plurality of reverse osmosis membrane elements become small, the effective membrane area becomes large, the membrane pages become large, the water yield becomes high, the permeability becomes high, and the pollution resistance becomes weak.
It should be noted that, in the fields of deep water supply processing, reclaimed water sewage resource processing, concentrated water reprocessing and the like, the problem that the concentrated water flow channel blockage speed of the first membrane elements at the water inlet end in one section of reverse osmosis membrane shell is too high generally exists, the concentrated water flow channel blockage of the first membrane elements can cause most of the inlet water to fail to effectively enter the tail end and subsequent sections of the reverse osmosis membrane shell, the tail end concentrated flow rate is lower than the designed minimum value, the turbulent flow self-purification effect of the membrane elements is weakened, the pollution rate is accelerated, the latter membrane elements in the membrane shell can not normally work, and the performance of the whole system is attenuated.
Most of conventional methods for solving the problems are 'pumping up water and stopping boiling', the frequency of a high-pressure pump 3 is reduced by reducing the water inlet pressure, although the pressure difference can be reduced for a moment, the reduction of the flow rate of concentrated water accelerates the system fouling, the pressure difference can be increased in a short time, the system performance is deteriorated, and finally the problems can be solved only by online or offline cleaning, but most of membrane elements with serious pollution cannot or are difficult to effectively recover the performance by cleaning, particularly the fouling of permanent hardness and the pollution of metal oxides and hydroxides, in order to ensure the production and operation, the problems can be solved only by replacing reverse osmosis membrane elements, the maintenance and use cost is increased while the normal production is influenced, unnecessary waste is caused, and the problems are not fundamentally solved.
Because the wider the water inlet flow channel, the stronger the anti-pollution performance of the membrane element and the lower the pressure drop of the membrane element, but the membrane element with the same size has a larger concentrated water flow channel, the membrane area of the membrane element can be reduced, if the concentrated water flow channel is simply increased without limitation, the whole water yield of the membrane element can be reduced, so in the installation design of the membrane element, the whole membrane area and the water yield need to be considered, so aiming at the problem that the former membrane elements of the system are easy to be polluted and blocked, the water inlet flow channels with different widths and the gradual change type installation arrangement are adopted, the membrane element with the extremely wide flow channel, the small membrane area, the small membrane pages and the low water yield and the low permeability and the strong anti-pollution performance is adopted at the water inlet end, the membrane element with the wide flow channel, the large membrane area, the multiple membrane pages and the high water yield is adopted at the tail end, so that the water yield flux distribution of the whole system is even, the hydraulic balance is better realized, and the membrane element starts from the water inlet end, the water production of the membrane element is increased in sequence, the width of the water inlet flow channel is reduced in a gradual shrinkage mode, the water production of the system is improved to the maximum degree while the pollution blockage and the energy consumption are effectively reduced, and meanwhile the early-stage investment cost can be reduced.
So set up, rationalize the overall arrangement through reverse osmosis membrane element for system's rate of recovery improves, and system pollution rate reduces, improves membrane system stability and continuity, has prolonged the life of membrane element, has reduced the fortune dimension cost of membrane system.
The water treatment module comprises N sections of reverse osmosis membrane shells, wherein N is a positive integer greater than zero, and the plurality of reverse osmosis membrane elements comprise a first membrane element, a second membrane element and a third membrane element.
When N is equal to 1, arranging a first membrane element at the position, close to the water inlet end, of one section of the reverse osmosis membrane shell, arranging a second membrane element in the middle of the reverse osmosis membrane shell, and arranging a third membrane element at the position, close to the water outlet end, of one section of the reverse osmosis membrane shell;
when N is 2, a first membrane element is arranged at one section of the reverse osmosis membrane shell close to the water inlet end, a second membrane element is arranged at one section of the reverse osmosis membrane shell close to the water outlet end, and a third membrane element is arranged at the second section of the reverse osmosis membrane shell;
when N is 3, one section reverse osmosis membrane shell sets up first membrane element, and two sections reverse osmosis membrane shells set up the second membrane element, and three-section reverse osmosis membrane shell sets up the third membrane element.
Therefore, according to water treatment modules in different forms, membrane element arrangement structures in different forms are adapted, so that the recovery rate is improved, and the pollution rate is reduced. Moreover, the three membrane elements with different models are installed in a gradual change mode, so that the installation cost is saved.
Specifically, the models of the first membrane element, the second membrane element and the third membrane element are SNBW-8040-FR280/56, SNBW-8040-FR365/36 and SNBW-XFR400/34 respectively.
Correspondingly, if the water treatment module adopts a first-stage and first-stage design, the first branch of the water inlet end of the first-stage reverse osmosis membrane shell is provided with an SNBW-8040-FR280/56 type membrane element, the second 2 branches are provided with SNBW-8040-FR365/36 type membrane elements, and the rest are provided with SNBW-XFR400/34 type membrane elements;
if the water treatment module adopts a first-stage two-stage design, the front 2 branches of the water inlet end of the first-stage reverse osmosis membrane shell are provided with SNBW-8040-FR280/56 type membrane elements, the rest membrane elements with the models of SNBW-8040-FR365/36 are arranged, and the membrane elements with the models of SNBW-XFR400/34 are arranged on the second-stage reverse osmosis membrane shell;
if the water treatment module adopts a three-section design, the membrane element with the model of SNBW-8040-FR280/56 is arranged in a first section of reverse osmosis membrane shell, the membrane element with the model of SNBW-8040-FR365/36 is arranged in a second section of reverse osmosis membrane shell, and the membrane element with the model of SNBW-XFR400/34 is arranged in a third section of reverse osmosis membrane shell.
Preferably, six reverse osmosis membrane elements are arranged in the reverse osmosis membrane shell, so that the reverse osmosis membrane shell adopts the conventional 6-membrane core design, is the same as the design of most of the existing water purification systems, and has stronger replaceability.
In this embodiment, the water treatment module includes one section reverse osmosis membrane shell and two-stage section reverse osmosis membrane shell, adopts the design of one-level two-stage promptly, and the end of intaking of one section reverse osmosis membrane shell is with the system intercommunication of intaking, the concentrated water end and the end intercommunication of intaking of two-stage section reverse osmosis membrane shell, produce water end and system and produce water and go out the water intercommunication, and the end intercommunication system of producing water of two-stage section reverse osmosis membrane shell is produced water and is gone out water, the concentrated water end and the end of intaking and the concentrated water play water of system of one section reverse osmosis membrane shell.
Wherein, the end of intaking of one section reverse osmosis membrane shell and the dense water of system go out the dense water end intercommunication with one section reverse osmosis membrane shell, and the system is intake and the end intercommunication of intaking of two-stage process reverse osmosis membrane shell.
Like this, can make one section reverse osmosis membrane shell and two-stage section reverse osmosis membrane shell can form the return circuit alone, make things convenient for one to produce water, the other washes or washs, has following advantage promptly:
1. each section all can independently become the system operation, and it is serious to block up when the dirty several membrane elements in the front of one section reverse osmosis membrane shell, leads to terminal dense water velocity to reduce, nevertheless because of the process water requirement, when can not shut down, can switch into the operation of two-stage reverse osmosis membrane shell, and one section reverse osmosis membrane shell in time carries out online chemical cleaning, when two-stage reverse osmosis membrane shell scale deposit is serious, also can switch into one section reverse osmosis membrane shell and move alone, and the online chemical cleaning of two-stage reverse osmosis membrane shell can guarantee to produce the water supply incessantly like this by the at utmost.
2. When the concentration polarization of one section of reverse osmosis membrane shell is not serious and the concentration polarization of the second section of reverse osmosis membrane shell is serious, the conventional design needs to be stopped to simultaneously wash the first section of reverse osmosis membrane shell and the second section of reverse osmosis membrane shell, so that unnecessary waste of water production of some systems is inevitably caused, the system is frequently started and stopped, and the continuity of water production cannot be realized. And this application can greatly reduced wash the replacement water yield, practices thrift and produces water and then improves the whole rate of recovery of system. For example, the two sections of reverse osmosis membrane shells are washed and replaced independently without stopping the machine, so that the pollution imbalance of each section of the system is prevented.
3. When the quality of the incoming water is greatly fluctuated compared with the designed quality of the incoming water, the quality of the incoming water of the second-section reverse osmosis membrane shell is worse, the incoming water of the first-section reverse osmosis membrane shell and the concentrated water of the first-section reverse osmosis membrane shell are mixed together and enter the second section, the concentrated water diluting effect is achieved, and rapid fouling and blocking of the second-section reverse osmosis membrane shell are prevented.
Furthermore, the water inlet end of one section of the reverse osmosis membrane shell is provided with an online conductivity meter for monitoring the concentration multiple of the salt content, the online conductivity meter is used for monitoring the concentration multiple of the salt content of the system, and further triggering the concentrated water discharge opportunity, so that the system can adjust the self-adaptive process at any time, and is more favorable for adapting to water quality fluctuation.
A booster pump 5 is arranged between the concentrated water end of the first section of the reverse osmosis membrane shell and the water inlet end of the second section of the reverse osmosis membrane shell and is used for balancing the hydraulic power of the system, ensuring that the average flux of each section is close, the distribution of produced water is even, and ensuring the flow velocity of the concentrated water at the tail end, thereby being beneficial to the realization of the pollution resistance and low energy consumption of the system.
The concentrate end of one section reverse osmosis membrane shell, the concentrate end of two-stage segment reverse osmosis membrane shell, set up circulating pump 4 between the end of intaking of one section reverse osmosis membrane shell and the concentrated water play water of system, thus, can circulate 77% concentrate back to the system and intake, the concentrated water velocity of system is wholly improved, guarantee the torrent effect in the membrane element, reinforcing system self-purification ability, can improve the whole rate of recovery of system again to a great extent, and can also reduce the energy consumption, come the constant current effect of balanced membrane element through increasing and reducing the circulation volume simultaneously, thereby reduce membrane pollution concentration, further reduce the pollution tendency.
In some preferred schemes, the water tank is produced to the end intercommunication of intaking of one section reverse osmosis membrane shell and two-stage segment reverse osmosis membrane shell, like this, when each section concentration polarization phenomenon is unbalanced, when production system water task is heavier unable shut down, can let single section normal operating, another section is produced the water tank and is carried out the low pressure and wash.
One section reverse osmosis membrane shell all communicates the washing water tank with the end of intaking of two-stage process reverse osmosis membrane shell, product water end and dense water end to in wash one section reverse osmosis membrane shell and two-stage process reverse osmosis membrane shell through wasing the water tank. Specifically, the concentrated water ends of the first section of reverse osmosis membrane shell and the second section of reverse osmosis membrane shell are communicated with a cleaning water tank through a circulating pump 4.
Certainly, the water inlet pump 1, the cartridge filter 2 and the high-pressure pump 3 are sequentially communicated between the water inlet of the system and one section of the reverse osmosis membrane shell, so that the water pressure of the water inlet of the system is increased, and the impurities of the water inlet are removed.
The following table compares the present system to a conventional system:
the operation mode of the water treatment system by the reverse osmosis membrane method is specifically described with reference to the above examples.
The operation mode of the reverse osmosis membrane water treatment system comprises the following steps:
high recovery and high yield mode
As shown in fig. 2-3, the system normally operates, water is produced in the whole section of the system, the water inlet pump 1 operates, the high-pressure pump 3 operates, the booster pump 5 operates, the circulating pump 4 operates, the system inlet water is completely input into the water inlet end of the first section of reverse osmosis membrane shell, or the system inlet water is shunted to the water inlet ends of the first section of reverse osmosis membrane shell and the second section of reverse osmosis membrane shell, and 77% -79% of concentrated water is recycled. The water yield is the maximum water yield of the system, the recovery rate is the maximum recovery rate of the system, the mode time is different according to different water qualities, the mode time is generally controlled to be 0.5-4 hours, and the recovery rate is generally controlled to be 85-90%. Compared with the traditional reverse osmosis system for reclaimed water and sewage with 50-60% recovery rate, the recovery rate can be improved by about 35%, and the larger the system scale is, the greater the economic benefit is brought.
First intermittent low-recovery low-water-yield mode
As shown in fig. 4-5, when the concentration polarization phenomenon of each section is unbalanced, and the production water making task is heavy and cannot be stopped, the mode is adopted, so that the single section can normally operate, the other section is flushed with inlet water or produced water at low pressure, the inlet pump 1 operates, the high-pressure pump 3 operates, the booster pump 5 stops operating, and the circulating pump 4 operates.
Compared with the traditional shut-down full-section flushing, about 20-35% of flushing water can be saved, the equipment can be guaranteed not to be shut down, the mode time is different due to different water qualities, and the mode time is generally controlled to be 1.5-5 min.
Second intermittent low recovery and low water yield mode
As shown in fig. 6, when the water inlet conductance of the system reaches a set value, which indicates that the concentration rate of the system reaches a designed value, i.e. the pollutants begin to form precipitation and adsorption on the membrane surface, in order to destroy the pollution tendency, it is necessary to increase the discharge amount of the concentrated water, reduce the recycling amount of the concentrated water, and reduce the recovery rate of the system, and use a large amount of fresh raw water as make-up water to dilute the concentrated water in the system, in this mode, the booster pump 5 and the circulating pump 4 are temporarily stopped, and the system is briefly flushed only by the high-pressure pump 3, and the mode time is generally controlled to be 1.5-3min because of different water qualities.
Intermittent start-stop flushing mode
As shown in fig. 7-8, this mode is the normal operation mode of the system, when the equipment is started and stopped, the system is flushed with the inflow water or the produced water of the system at low pressure, so as to displace the air, the concentrated water and the chemical agent in the system from the equipment, thereby preventing the system from being polluted, prolonging the cleaning period of the system, and generally controlling the flushing time at 3-5 min.
Intermittent non-stop single-section online circulating maintenance cleaning mode
As shown in fig. 9-10, when the surface of the reverse osmosis membrane element is fouled with inorganic salt scale, metal oxides, microorganisms, colloidal particles, and insoluble organic matter, the normalized water production and salt rejection rate are respectively decreased, the pressure difference between stages is increased, or both are deteriorated. When one of the following conditions occurs and is judged to be caused by chemical pollution, the mode is adopted and is generally judged according to the changes of pressure, pressure difference, water yield and desalination rate indexes, and the judgment standard is as follows:
after the operation data is standardized, the water yield of the system is reduced by more than 10% compared with the initial value;
after the operation data is standardized, the salt rejection rate is reduced by more than 5% compared with the initial value;
after the operation data is normalized, the pressure difference between the sections is increased by more than 10 percent compared with the initial value.
Compared with the traditional shutdown cleaning mode, the mode can save about 20 percent of cleaning water and 40 percent of cleaning agent, and can ensure that the equipment is not shut down, and the mode time is different due to different water qualities and is generally controlled to be 15-45 min.
Intermittent shutdown on-line circulation recovery cleaning mode
As shown in FIG. 11, when the system determines that there is pollution, and the pollution is serious, and the system performance is not obviously changed or even continuously deteriorated by adopting the above operation mode, the mode is adopted, which needs to be stopped, the first section of reverse osmosis membrane shell and the second section of reverse osmosis membrane shell are cleaned by the cleaning water tank, the time is different due to different water quality and pollution degree, and is generally controlled within 2-16 hours.
It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like as used herein, are intended to indicate an orientation or positional relationship relative to that shown in the drawings, but are merely used to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description herein, it is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the application comprise basic schemes of the schemes, are independent of each other and are not restricted to each other, but can be combined with each other under the condition of no conflict, so that multiple effects are achieved together.
While embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A reverse osmosis membrane water treatment system is characterized by comprising a water treatment module, wherein the water treatment module comprises a plurality of reverse osmosis membrane elements, and the water inlet flow channels of the plurality of reverse osmosis membrane elements become small, the effective membrane area becomes large, the membrane pages become large, the water yield becomes high, the permeability becomes high, and the pollution resistance becomes weak along the direction of concentrated water in the water treatment module.
2. The RO membrane method water treatment system according to claim 1, wherein the water treatment module includes an RO membrane housing having N stages, and the plurality of RO membrane elements includes a first membrane element, a second membrane element, and a third membrane element provided in the RO membrane housing, where N is a positive integer greater than zero;
when N is equal to 1, arranging the first membrane element at the position, close to the water inlet end, of one section of the reverse osmosis membrane shell, arranging the second membrane element in the middle of the reverse osmosis membrane shell, and arranging the third membrane element at the position, close to the water outlet end, of one section of the reverse osmosis membrane shell;
when N is 2, the first membrane element is arranged at the position, close to the water inlet end, of one section of reverse osmosis membrane shell, the second membrane element is arranged at the position, close to the water outlet end, of one section of reverse osmosis membrane shell, and the third membrane element is arranged at the position, close to the water outlet end, of the second section of reverse osmosis membrane shell;
and when N is 3, the first membrane element is arranged on one section of reverse osmosis membrane shell, the second membrane element is arranged on the second section of reverse osmosis membrane shell, and the third membrane element is arranged on the third section of reverse osmosis membrane shell.
3. The reverse osmosis membrane method water treatment system according to claim 2, wherein the first membrane element, the second membrane element and the third membrane element are of the types SNBW-8040-FR280/56, SNBW-8040-FR365/36 and SNBW-XFR400/34, respectively.
4. The reverse osmosis membrane water treatment system as claimed in claim 2, wherein six reverse osmosis membrane elements are provided in the reverse osmosis membrane housing.
5. The RO membrane method water treatment system as claimed in claim 2, wherein the water treatment module comprises a first section RO membrane shell and a second section RO membrane shell, the water inlet end of the first section RO membrane shell is communicated with the system water inlet, the water concentrate end is communicated with the water inlet end of the second section RO membrane shell, and the water producing end is communicated with the system water outlet, the water producing end of the second section RO membrane shell is communicated with the system water outlet, and the water concentrate end is communicated with the water inlet end of the first section RO membrane shell and the system water concentrate outlet.
6. The RO membrane method water treatment system as claimed in claim 5, wherein both the inlet end of the first RO membrane housing and the system concentrate outlet are communicated with the concentrate end of the first RO membrane housing, and the system inlet is communicated with the inlet end of the second RO membrane housing.
7. The RO membrane method water treatment system as claimed in claim 6, wherein the water inlet end of the first RO membrane casing is provided with an on-line conductivity meter for monitoring concentration multiple of salt content, a booster pump (5) is provided between the concentrate end of the first RO membrane casing and the water inlet end of the second RO membrane casing, and a circulation pump (4) is provided between the concentrate end of the first RO membrane casing, the concentrate end of the second RO membrane casing, the water inlet end of the first RO membrane casing and the system concentrate outlet water.
8. The RO membrane method water treatment system as claimed in claim 7, wherein the first-stage RO membrane housing is communicated with a water tank at a water inlet end of the second-stage RO membrane housing.
9. The RO membrane method water treatment system as claimed in claim 7, wherein the water inlet, water outlet and concentrate ends of the first and second RO membrane housings are communicated with a cleaning water tank.
10. A water treatment system according to the reverse osmosis membrane method, as defined in claim 7, wherein a water inlet pump (1), a cartridge filter (2) and a high pressure pump (3) are communicated between the system water inlet and the section of the reverse osmosis membrane shell in sequence.
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| CN202310900689.2A CN116768325A (en) | 2021-12-13 | 2021-12-13 | Reverse osmosis membrane method water treatment system |
| CN202111517784.1A CN114314878A (en) | 2021-12-13 | 2021-12-13 | Water treatment system by reverse osmosis membrane method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114988597A (en) * | 2022-07-15 | 2022-09-02 | 金科环境股份有限公司 | Anti-pollution reverse osmosis membrane filtering system |
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| JP2000000437A (en) * | 1998-06-18 | 2000-01-07 | Toray Ind Inc | Spiral reverse-osmosis membrane element and separator using the element |
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| CN113697978A (en) * | 2021-08-20 | 2021-11-26 | 西安聚方环境科技有限公司 | Three-stage reverse osmosis membrane system and process for high-power concentration |
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2021
- 2021-12-13 CN CN202310900689.2A patent/CN116768325A/en active Pending
- 2021-12-13 CN CN202111517784.1A patent/CN114314878A/en active Pending
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| JP2000000437A (en) * | 1998-06-18 | 2000-01-07 | Toray Ind Inc | Spiral reverse-osmosis membrane element and separator using the element |
| CN203256008U (en) * | 2013-04-23 | 2013-10-30 | 北京中联动力技术有限责任公司 | Automatic-control reverse osmosis membrane wastewater treatment system |
| CN205076936U (en) * | 2015-10-14 | 2016-03-09 | 东莞市四通环境治理有限公司 | Reverse osmosis seawater desalination equipment |
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| CN114988597A (en) * | 2022-07-15 | 2022-09-02 | 金科环境股份有限公司 | Anti-pollution reverse osmosis membrane filtering system |
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