CN100342956C - Membrane filter - Google Patents
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- CN100342956C CN100342956C CNB2005101336400A CN200510133640A CN100342956C CN 100342956 C CN100342956 C CN 100342956C CN B2005101336400 A CNB2005101336400 A CN B2005101336400A CN 200510133640 A CN200510133640 A CN 200510133640A CN 100342956 C CN100342956 C CN 100342956C
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Abstract
The present invention relates to a membrane filter which comprises a water inlet system, a membrane filtering system, a water producing system, an aerating system and a control system, wherein the membrane filtering system comprises a membrane filtering tank and an immersed module arranged in the membrane filtering tank, the air inlets of the module are in pipe connection with the aerating system and then are connected with the control systems, the water outlets of the module are orderly connected with the water producing valve of the water producing system through a water outlet valve and a pressure gauge which are in pipe connection, a membrane component composed of 2 to 10 curtain membranes is arranged in the module, and the aerating system is simultaneously in pipe connection between the membranes and at the lower part of the membrane component; the aerating system orderly comprises a blower, an air flow meter and an aeration regulating valve which are in pipe connection and are connected with the control system, and an aerating pipe arranged between the membranes and an aerating pipe at the lower part of the membrane component; the control system is a PLC controller and corresponding software. The membrane filter of the present invention is an immersed curtain type membrane filter for seawater pretreatment, and the unique aerating mode can enhance anti-pollution extent of the membranes, extends service life and stabilize water outlet quality and quantity.
Description
Technical field
The present invention relates to the film filter in the membrane separation technique field, be specially a kind of water that is mainly used in and purify and the pretreated immersion curtain type membrane of reverse osmosis seawater desalting filter, international monopoly Main classification number plan is Int.Cl
7B01D63/02.
Background technology
Core desalination element in the seepage-resisting sea-water desalting process is a reverse osmosis membrane.The seawater that this reverse osmosis membrane requirement enters must reach certain water quality index and just can enter, therefore seawater is before reverse-osmosis membrane element, must carry out preliminary treatment to it, just will be with Impurity removals such as the solid particle in the seawater, bacterium, algae, in order to avoid cause the pollution of reverse osmosis membrane.In the described water quality index, topmost index is pollution index (SDI), requires it less than 3.Present desalinization preliminary treatment is divided into conventional preliminary treatment and degree of depth preliminary treatment situation according to the seawater quality situation.Conventional preprocess method has modes such as sand filtration, multi-medium filtering or flocculation+multi-medium filtering; Modes such as flocculation+membrane filtration or sand filtration+membrane filtration are adopted in the pretreated filtration of the degree of depth usually.It is bigger that conventional pretreated filter type is influenced by former seawater quality, and that the pretreated membrane filtration mode of the degree of depth is influenced by former seawater quality is less, and the reliability of water outlet will be much higher than the conventional pretreatment mode.Its key factor just is that degree of depth preprocess method has adopted membrane filtration technique.
Membrane filtration can be divided into the pillar membrane filtration and the immersion curtain type membrane filters dual mode.Immersion curtain type membrane filtering technique is used for membrane bioreactor the earliest, but the effectively catching bacterium, the activated sludge concentration height can make that water outlet COD is few, turbidity is low, and water quality is good, and can make sewage be able to reuse.At present, people such as the yellow rosy clouds of domestic Tsing-Hua University, University Of Tianjin turn round and look at and put down, Chinese Academy of Sciences's environmental ecology center Fan Yao ripple carried out research to the immersion curtain type membrane, and some patents have been applied for, for example, membrane module (the patent No.: 02145966.5) that adopts machinery to clean, integral type film biological reactor (patent No.: 01120691.8), the membrane bioreactor of disposing of sewage (patent No.: 01212672), the doughnut film reaction apparatus for treating sewage (patent No.: 97228032) etc.These documents mainly are to study at the treatment process of some industry or sanitary sewage.In the world can (ZENON) company to the Canadian pool of mainly containing of studying of immersion curtain type membrane, MIT and company of Asahi Chemical Industry also have the product of immersion hollow-fibre membrane to sell, but the research that their great majority carry out at sewage (MBR) technology has only ZENON company that the preliminary treatment that curtain type membrane is used for desalinization is arranged.The used film of different companies is different with membrane module structure, and aeration mode is also different, and majority is that aeration tube is put in the membrane module bottom, plays the effect to microorganism oxygen supply and shake film silk.For the membrane module of being made up of two diaphragms, its major defect is the pollution problem that can not solve curtain type membrane well.In use, because this membrane module is only at the bottom of film aeration, make between two diaphragms of same membrane module and have show slurry, cause the effective filtration area of film to reduce, flux reduces, and when mud is serious, also can cause the root fracture of film, cause the film afunction, the effluent quality severe exacerbation.
Summary of the invention
At the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is, propose a kind of pretreated film filter of desalinization that is mainly used in, this film filter adopts immersion curtain formula hollow-fibre membrane, between diaphragm and the aeration simultaneously of membrane module bottom, has good filtration effect, contamination resistance is strong, and the film long service life is simple in structure, with low cost, implement advantages such as easy.
The technical scheme that the present invention solves described film filter technical problem is: design a kind of film filter, comprise water inlet system, membrane filtration system, water production system, aerating system and control system; Described water inlet system comprises middle water tank, the intake pump that pipe successively connects, and inserts the membrane filtration groove of membrane filtration system; Described membrane filtration system comprises the membrane filtration groove and places its interior immersion module, the inlet tube of module is joined with described control system after connecing aerating system, the flowing water Valve that the delivery port of module connects through pipe successively and the product penstock of Pressure gauge and described water production system join, the membrane module that is made of 2-10 curtain type membrane sheet is housed in the module, between diaphragm and the membrane module bottom simultaneously pipe connect aerating system; Described aerating system comprise the air blast that links to each other with control system, gas flowmeter, the aerating regulation valve that pipe connects successively and be arranged between the diaphragm aeration tube and at the aeration tube of membrane module bottom; Described water production system comprises product penstock, fluid flowmeter, product water pump, electromagnetic flowmeter and the online transmissometer that pipe successively connects, and inserts and produces water pot; Be separately installed with liquid level control meter in the middle of described in water tank, membrane filtration groove and the product water pot; Described membrane filtration trench bottom is provided with mud valve; Described control system is PLC controller and corresponding software, and described intake pump, air blast, product water pump and liquid level control meter, online transmissometer, electromagnetic flowmeter are electrically connected with the PLC controller respectively.
Compare with the MBR of prior art, film filter of the present invention is a kind of continuously-submerged curtain type membrane filter that uses at sea water preprocessing.It need not consider the biofacies problem, and equipment takes up an area of few, and simple in structure, industrializing implementation is easy.Film silk in the film filter particularly of the present invention is in suitable loose condition (of surface), adds between upper diaphragm and membrane module bottom unique aeration mode of aeration simultaneously, and the antipollution degree of film is improved greatly, and greatly prolong service life, and the effluent quality and the water yield are more stable.Than the pillar film of prior art the impact of better anti-change of water quality is arranged, poly-iron flocculate tolerance concentration is improved, be particularly useful for the sea water preprocessing of heavy contamination.
Description of drawings
Fig. 1 is the integrally-built a kind of embodiment schematic diagram of film filter of the present invention;
Fig. 2 is structure (the comprising the aeration mode structural design) schematic diagram of the described module of a kind of embodiment of film filter of the present invention;
Fig. 3 installs the distributed architecture schematic diagram for the described module of a kind of embodiment of film filter of the present invention in the membrane filtration groove;
Fig. 4 is the PLC control program block diagram of the control system of a kind of embodiment of film filter of the present invention.
The specific embodiment
Film device of the present invention is mainly used in the preliminary treatment of seawater.Its simple process flow is as follows:
The seawater of former seawater → flocculating setting → middle water tank → immersion curtain type membrane filter → product water pot → purification.
Film filter of the present invention (hereinafter to be referred as film device, referring to Fig. 1) comprises water inlet system, membrane filtration system, water production system, aerating system and control system.
The described water inlet system of film device of the present invention comprises middle water tank 1, the intake pump 3 that pipe successively connects, and inserts the membrane filtration groove 9 of membrane filtration system.When film device used, seawater at first passed through the sedimentation of flocculating setting technology.Seawater behind flocculating setting, water tank 1 in the middle of entering.The volume of middle water tank 1 designs according to film device Seawater Treatment ability.The volume of the middle water tank 1 of embodiment is 3m
3Be provided with protective device liquid level control meter 2 in the middle water tank 1, i.e. the work of intake pump or supply-water pump 3 is controlled by the protection of liquid level control meter 2 and 6: when the seawater that stores was lower than the design liquid level, middle water tank 1 stopped to supply water automatically.Supply-water pump 3 can be squeezed into the water in the middle water tank 1 in the membrane filtration groove 9, utilizes described immersion module 8 to carry out membrane filtration.Design has three liquid level control points, upper, middle and lower in the membrane filtration groove 9, with the work of protection module 8 and control supply-water pump 3.When the seawater liquid level was higher than liquid level in the membrane filtration groove 9, supply-water pump 3 stopped to supply water; When seawater is lower than the centre liquid level, supply-water pump 3 normal water supplies; And when seawater was lower than liquid level, film device stopped to produce water, so that the seawater liquid level is not less than the height of module 8, guarantees that diaphragm 82 is not exposed among the air.
The described membrane filtration system of film device of the present invention comprises membrane filtration groove 9 and places immersion module 8 and the control of membrane filtration tank liquor position in it to count 6.After the air inlet of module 8 and described aerating system pipe connect, join with described control system; The delivery port of module 8 connects with the water production system pipe through flowing water Valve 10 and the Pressure gauge 11 that pipe connects successively.Be equipped with in the module 8 by 2-10 membrane module (referring to Fig. 2), collector pipe 84 constituted under each membrane module was reached by two curtain type membranes 82 and last collector pipe 81.The diaphragm 82 of membrane module is the external-compression type hollow-fibre membrane, and film silk loosely is immersed in the water, and the two ends of hollow-fibre membrane silk are watered to cast from epoxy sealing and constituted a membrane module on the described collector pipe.Each membrane module two ends water outlet, two delivery ports of each assembly in the module 8 are connected on the upper and lower collector pipe 81,84, and upper and lower collector pipe 81,84 comes together on the exit branch, and connects with flowing water Valve 10 pipes.Pipe connects aerating system simultaneously in 82 on diaphragm and membrane module bottom.The last aeration tube 83 of aerating system places between two diaphragms 82 of membrane module, and following aeration tube 85 is installed on the bottom of membrane module.These assemblies all are integrated on the film frame 86, constitute module 8 integral body.Immersion curtain type membrane sheet 82 in the membrane module is installed the production engineering specifications that how much depends on of quantity.Constitute by 7 doughnut immersion curtain type film assemblies in the module 8 of embodiment.The delivery port of each module 8 all divides no matter is connected to valve 10, so that control separately and adjust.Thermo detector (not drawing among the figure) also can be installed in the membrane filtration groove 9 of the embodiment of the invention, and it is linked to each other with described PLC controller, with the temperature of liquid in the automatic monitoring membrane filtration groove 9.Certainly, also described thermo detector can be installed, can use the thermometer periodic monitoring by the operator the monitoring of water temperature in the membrane filtration groove 9.The bottom of described membrane filtration groove 9 is provided with mud valve 15, can regularly remove the mud in the membrane filtration groove 9.
Film device of the present invention is installed module 8 in membrane filtration groove 9 quantity depends on the design of aquifer yield and membrane filtration groove size.Can design n module 8 in parallel in the membrane filtration groove 9, each module 8 all is furnished with air intake valve 7
1-7n and flowing water Valve 10
1-10n, and they are divided into two groups, being evenly distributed on the both sides of membrane filtration groove 9, the arm of the same side is connected to (referring to Fig. 3) on the main.For controlling conveniently, the module 8 of each side parallel connection as producing water pump 14, also is that package unit constitutes water production system by two product water pumps 14 and respective line by a centrifugal pump in the membrane filtration groove 9.The product mouth of a river of each module 8 is connected with outlet pipeline.The caliber of described collector pipe can be selected according to aquifer yield and water flow velocity.Though design only has 1 module 8 in the membrane filtration groove 9 of embodiment of the invention accompanying drawing 1, can design more module 8 fully.As a same reason, the membrane filtration groove 9 of the embodiment of the invention also only is designed to 1, but film device of the present invention as required can design membrane filtration groove 9 in parallel more than 2 or 2.The power and the quantity of described supporting product water pump 14 also can adjust accordingly.
The described aerating system of film device of the present invention comprise the air blast that links to each other with control system 4, gas flowmeter 5, the aerating regulation valve 7 that pipe connects successively and be arranged between the diaphragm aeration tube and at aeration tube of membrane module bottom etc.Its key structure design is to accompany aeration tube between two diaphragms of each membrane module, in the membrane module bottom aeration tube is installed also simultaneously.Described aeration tube adopts boring aeration pipe, promptly has the solarization air cap of diameter 2-4mm on the aeration tube.The spacing of solarization air cap and quantity calculate according to aeration rate and air velocity, and the spacing design of embodiment is between 3-6cm, to guarantee certain aeration intensity.Solarization air cap between two diaphragms is upwards installed, and the solarization air cap of membrane module 4 below aeration tubes divides two rows, and for example miter angle is placed to oblique below at a certain angle, in case the sludge blockage solarization air cap.For curtain type membrane, it is important that empty aeration mode causes the pass to decelerating membrane pollution.The effect of empty aeration has two: one, microorganism oxygen supply (when being used for MBR) in the feedwater; The 2nd, impel the shake of film silk, utilize the friction on bubble and film surface to remove the film surface contaminant, improve the cleaning effect on film surface.Discover, can stop the pollution in the curtain type membrane outside at membrane module bottom aeration, and inboard mud easily, the fracture of film silk when causing membrane flux reduction and off-line to clean; Iff at two middle aerations of membrane module, can slow down the pollution of film inboard, but the outside that is to say that owing to being cleaned by bubble and can not removing pollution the empty aeration mode of between the single diaphragm and membrane module bottom all has limitation.The present invention adopts between two of the bottom of membrane module and films and adds aeration tube, makes the inside and outside scrubbing action that all can be subjected to the aeration bubble of every film, facts have proved it is the most effective aeration mode.This ingenious design by change aeration mode and position of the present invention can make film device in running, and the inside and outside of each sheet diaphragm can both produce the bubble scrub effect, can very effective decelerating membrane pollution.This means for decelerating membrane pollution, the present invention has designed between the diaphragm of same membrane module and the membrane module bottom frame mode of aeration simultaneously, can make the inside and outside equal scrubbing action that can be subjected to bubble of every film, prevented show slurry between diaphragm, slowed down the film pollution effectively, prolong the cleaning frequency of film and the service life of film, improved the film device operating efficiency.
The described water production system of film device of the present invention comprises product penstock 12, fluid flowmeter 13 that pipe successively connects, produces water pump 14, electromagnetic flowmeter 16, online transmissometer 17 and produces water pot 19 and is installed in the liquid levels control meter 18 that produces in the water pot 19 etc.Producing penstock 12 connects with described Pressure gauge 11 pipes.Water producing pipe route main pipe and arm constitute water production system.Each arm links to each other with a module 8.Arm converges on the main pipe.Main pipe is connected with product water pump 14, and inserts and produce water pot 19.Under the swabbing action of product water pump 14 centrifugal force, fibrous inside produces negative pressure, and the micropore that hydrone and inorganic molecules see through on the film silk enters the inside of hollow-fibre membrane, and comes together in the collector pipe, and then is drawn in the product water pot 19 by product water pump 14.Described electromagnetic flowmeter 16 is electrically connected with the PLC controller, at any time reading system produce the water cumulative amount and moment aquifer yield.Online transmissometer 17 also is electrically connected with the PLC controller, can monitor the water quality of producing water at any time.When the turbidity that produces water was higher than normal value, illustrating had the breakage of film silk in the film device, should test, and met the water inlet requirement of counter-infiltration system with the water quality of guaranteeing to produce water.
The described control system of film device of the present invention is mainly the PLC controller, comprises corresponding software and touch-screen.Described intake pump 3, air blast 4, product water pump 14 and water tank liquid level control meter 2, membrane filtration tank liquor position control meter 6, product water pot liquid level control meter 18, thermo detector, electromagnetic flowmeter 16, online transmissometer 17 etc. are electrically connected with the PLC controller respectively.These are prior art.The corresponding software flow chart that the PLC controller uses as shown in Figure 4.According to this flow chart and described equipment configuration and technological requirement, those skilled in the art are not difficult to write out specific procedure.The operation of control system divides manually and automatic two kinds.The major control of PLC controller be attached thereto into and out of work such as water pump, air blast, frequency converter, electromagnetic flowmeter, liquid level gauges.The control parameter mainly comprises system temperature, delivery turbidity, product discharge, blower frequency etc., and relevant information can be transported on the touch-screen and show, also can change operational factor, compare etc., realize effective human-computer dialogue as the start-stop that produces water pump by the PLC controller.
Film device of the present invention is further characterized in that on the pipeline between described product penstock 12 and the water flow meter 13 and is connected to sample cock 23.So just on each water producing pipe, designed sample tap.Though the design of the sample tap of embodiment is between the pipeline that produces water regulating valve 12 and water flow meter 13, this is not limited, and it also can design in other suitable positions.Opening sample cock 23 can take a sample from sample tap easily at any time, detects effluent quality.The modular design of film device of the present invention also makes each module 8 can sample separately, keep in repair and change, and both can make things convenient at any time to detect.Can guarantee the continuous operation of total system again.
Clearly, the film pollution in use will take place in film inevitably.Film pollutes and directly causes membrane flux to descend, and function reduces, and therefore need clean film.The cleaning of film can be divided into cleans at random and regularly cleans.Film device of the present invention has cleaning function at random.It mainly is to finish by the operational mode of the described product water pump 14 of design.The start-stop ratio that produces water pump 14 can be set to: 7-12: 1-3.The start/stop time ratio that the embodiment film device produces water pump 14 is designed to 8: 2 (open 8 and stop 2), and promptly every product water 8 minutes was shut down the water outlet of aeration at interval in 2 minutes or produced the water running pattern.Understand easily, the available machine time is long, and aquifer yield can improve, but film pollutes aggravation; And downtime is long, help aeration and eliminate the film pollution, but aquifer yield decline, device efficiency reduces, and therefore will take all factors into consideration balance or optimization startup-shutdown time.This design can make film device in the product water intermittent time of aeration, and the film surface contaminant is got rid of effectively.During the whole service, it is stable that membrane flux can keep, and transmembrane pressure rises slowly.The experiment of embodiment shows that the membrane flux of film device can be stabilized in 10-12L/m
2.h., gas-water ratio can be controlled in 15: 1-25: in 1 scope.
Each module 8 of film device of the present invention all can be carried out online and off-line cleans.The regular cleaning of film device of the present invention, can be in the following ways: (1) regularly blowdown, 30-60 minute spoil disposal time is arranged every day, around here can empty aeration, make shake of film silk and bubble friction remove the pollution on film surface; (2) backwash regularly, the pipeline of film device of the present invention between described Pressure gauge 11 and product penstock 12 can insert the backwash system, opens backwash valve 22 and closes product penstock 12, produces water regularly to module 8 anti-cleanings with film; (3) Chemical cleaning for saving chemical agent and system's continuous operation, can be carried out the off-line Chemical cleaning with serious pollution module 8.The hydrochloric acid or the clorox (1000-2000mg/L) that clean with finite concentration (1000-2000mg/L) soak 4-10h., and membrane flux can return to initial level substantially.Chemical cleaning can every 2-3 month be carried out once, when transmembrane pressure TMP＞0.5MPa, need carry out Chemical cleaning.
The further feature of film device of the present invention is also to have access to the backwash system, it comprises and the backwash valve 22 and the discharging valve 21 that produce centrifugal pump 20 that water pot 19 pipes connect and connect with centrifugal pump 20 pipes respectively that backwash valve 22 accesses are on the pipeline between described product penstock 12 and the Pressure gauge 11.The design of backwash system means that film device of the present invention enters the output water that produces water pot 19, both can supply with reverse osmosis membrane system by discharging valve 21, carries out next step desalinization, can be used for the backwash of the module 8 of film device own again.Described centrifugal pump 20 can be used for supplying with the supply-water pump of RO with producing water, also can be used as the backwashing pump of film device itself.
The present invention is the prior art of addressing that is applicable to.
For the desalinization pretreating process, best prior art is continuous microfiltration technology (CMF).But, because what its continuous microfiltration technology adopted is column-type film components, in water inlet, contain algae and not sedimentation completely during flocculant, can make the film of CMF system seriously polluted, produce the water number amount and seriously descend, work can not be carried out smoothly, must carry out Chemical cleaning, and Chemical cleaning frequency height can cause damage to the film silk, shortens the service life of film.Film device of the present invention is owing to adopted the immersion curtain type film assembly, its film silk is in loose condition (of surface) in handling seawater, design has simultaneously been adopted between continuous aeration and special diaphragm and the following pair aeration mode of diaphragm, thereby decelerating membrane pollution greatly, membrane flux is descended slowly, the product water quality is stable, can work long hours and normally carry out continuously.Experiment shows, for identical water inlet seawater quality, the CMF system will carry out primary chemical cleaning in 2-4 days, and film device of the present invention continuously operate as normal just needed primary chemical cleaning in 2 months, cleaning frequency significantly reduces, life cycle and membrane lifetime prolong at double, and effluent characteristics and operating efficiency greatly improve.
Embodiment film device of the present invention has passed through experimental check:
1. design the module 8 that 6 parallel connections are arranged in the membrane filtration groove 9 of experiment usefulness, also be N=6, but in six modules 8 in experiment, one group is adopted of the present invention pair of aeration mode, and other five employing membrane module bottom aeration modes found that, in 3 months of operation, have only the module 8 of aeration mode of the present invention that the flux decay does not take place substantially, flux has in various degree all taken place and has descended in other several pack modules, and the flux attenuation amplitude does not wait from 30-70%.
2. in the Tianjin of 100 tons/day of scales desalinization preliminary treatment project, use film device equipment of the present invention (N=6) successful operation more than four months, prove feasible and reliable, effective decelerating membrane pollution, prolong the cleaning frequency of film, setting up membrane module below aeration mode with routine compares, under the identical water quality environment and under the service condition, the film surface contamination is slight, the flux fall is little, and generally speaking, reverse osmosis seawater desalting RO water inlet requires SDI＜5, turbidity＜1NTU, total iron content＜0.3mg/L.Film device of the present invention produces SDI＜2.5 of water, turbidity 0.06-0.1NTU, and average 0.077NTU, total iron content 52-8 μ g/L, average 24 μ g/L reach and are better than the water inlet requirement of reverse osmosis membrane fully, effectively realize the catharsis of seawater.
Film filter of the present invention is simple in structure, and technology is easy, and is with low cost, has the favorable industrial practicality, if combine with conventional flocculation process, will be a kind of very effective reverse osmosis seawater desalting preconditioning technique, be particularly useful for the sea water preprocessing of heavy contamination.
Claims (8)
1. a film filter comprises water inlet system, membrane filtration system, water production system, aerating system and control system; Described water inlet system comprises middle water tank, the intake pump that pipe successively connects, and inserts the membrane filtration groove of membrane filtration system; Described membrane filtration system comprises the membrane filtration groove and places its interior immersion module, after the inlet tube of module connects aerating system, join with described control system, the flowing water Valve that the delivery port of module connects through pipe successively and the product penstock of Pressure gauge and described water production system join, the membrane module that is made of 2-10 curtain type membrane sheet is housed in the module, between diaphragm and the membrane module bottom simultaneously pipe connect aerating system; Described aerating system comprises the air blast that links to each other with control system, gas flowmeter, the aerating regulation valve that pipe connects successively and is arranged on aeration tube between the diaphragm and the aeration tube of membrane module bottom; Described water production system comprises product penstock, fluid flowmeter, product water pump, electromagnetic flowmeter and the online transmissometer that pipe successively connects, and inserts and produces water pot; Be separately installed with liquid level control meter in the middle of described in water tank, membrane filtration groove and the product water pot; Described membrane filtration trench bottom is provided with mud valve; Described control system is PLC controller and corresponding software, and described intake pump, air blast, product water pump and liquid level control meter, online transmissometer, electromagnetic flowmeter are electrically connected with the PLC controller respectively.
2. film filter according to claim 1, it is characterized in that having on the described aeration tube solarization air cap of diameter 2-4mm, the spacing 3-6cm of solarization air cap, and the solarization air cap of aeration tube is upwards installed between two films, and the solarization air cap of membrane module below aeration tube divides two rows, places to oblique below with miter angle.
3. film filter according to claim 1 and 2, it is characterized in that also inserting in the film filter backwash system, comprise the centrifugal pump that connects with described product water pot pipe and the backwash valve and the discharging valve that connect with centrifugal pump line respectively, backwash valve is connected between described product penstock and the manometric pipeline.
4. film filter according to claim 1 and 2 is characterized in that being connected to sample cock on the pipeline between described product penstock and the fluid flowmeter.
5. film filter according to claim 3 is characterized in that being connected to sample cock on the pipeline between described product penstock and the fluid flowmeter.
6. according to claim 1,2 or 5 described film filters, it is characterized in that the product water pump operation start-stop ratio that described control system is set is 7-12: 1-3.
7. film filter according to claim 3 is characterized in that the product water pump operation start-stop ratio that described control system is set is 7-12: 1-3.
8. film filter according to claim 4 is characterized in that the product water pump operation start-stop ratio that described control system is set is 7-12: 1-3.
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| CN103585888A (en) * | 2012-08-17 | 2014-02-19 | 上海市政工程设计研究总院（集团）有限公司 | Immersed-type ultrafiltration membrane pool and on-line chemical cleaning method thereof |
| CN107010799A (en) * | 2017-06-15 | 2017-08-04 | 中国农业科学院农田灌溉研究所 | It is a kind of that the soil improvement system used in salt leaching is filled in Winter-Spring |
| CN107902754A (en) * | 2017-12-25 | 2018-04-13 | 湖州富优得膜分离科技有限公司 | Diaphragm is aerated MBR devices |
| CN108144448A (en) * | 2018-02-09 | 2018-06-12 | 苏州膜海分离技术有限公司 | A kind of collecting system for rotary film device |
| CN110683638B (en) * | 2019-10-17 | 2022-04-26 | 江苏大学 | Membrane bioreactor based on needle-shaped membrane and coral sand |
| CN113562811B (en) * | 2021-08-30 | 2024-04-12 | 海南立昇净水科技实业有限公司 | Membrane filtration system and method of operating the same |
| CN115159670A (en) * | 2022-05-25 | 2022-10-11 | 宁波建嵘科技有限公司 | Cylindrical membrane assembly, membrane unit provided with cylindrical membrane assembly and operation process |
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