CN104707484A - Reverse osmosis membrane assembly continuous cleaning device, and method utilizing device for reverse osmosis membrane assembly cleaning - Google Patents
Reverse osmosis membrane assembly continuous cleaning device, and method utilizing device for reverse osmosis membrane assembly cleaning Download PDFInfo
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- CN104707484A CN104707484A CN201510104686.3A CN201510104686A CN104707484A CN 104707484 A CN104707484 A CN 104707484A CN 201510104686 A CN201510104686 A CN 201510104686A CN 104707484 A CN104707484 A CN 104707484A
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Abstract
The invention relates to a reverse osmosis membrane assembly continuous offline cleaning device. The device comprises a plurality of cleaning tanks, and a driving and conveying device, wherein the cleaning tanks are used for soaking and cleaning reverse osmosis membrane assemblies, and are independent from one another; the driving and conveying device is used for driving the reverse osmosis membrane assemblies to be continuously cleaned in the cleaning tanks which are independent from one another. The offline cleaning method is adopted; the polluted membrane assemblies are soaked in the cleaning solution tanks, and parallel connection is adopted by the equipment for simultaneous and separate cleaning of the multiple membrane assemblies; a cleaning solution inlet end cover and one end of each membrane assembly are fixed on a double-chain through clamps, and the other end of each membrane assembly is fixed on the other side of the double-chain, so that the assemblies can be conveniently mounted, the complex assembly disassembly process is avoided, and labor conservation is achieved; an identical number of the membrane assemblies are mounted in each cleaning solution tank, the equipment automation level is improved through the chain transmission method, and the membrane assemblies in the different cleaning solution tanks are operated at the same time, so that the whole assembly line is continuous, the cleaning time is reduced, and the cleaning efficiency is improved.
Description
Technical field
The present invention relates to cleaning equipment technical field, particularly a kind of reverse osmosis membrane assembly continuous cleaning device and utilize this device to clean the method for reverse osmosis membrane assembly.
Background technology
Reverse osmosis technology is widely used in water treatment field, its operation principle be with pressure differential before and after film for motive force, utilize the selective penetrated property of film to reach being separated of solvent and solute.Due to the selective penetrated property of film, in water inlet, solute is concentrated on reverse osmosis membrane surface, forms precipitation and is attached to reverse osmosis membrane surface or is jammed in reverse osmosis membrane fenestra, cause reverse osmosis membrane to pollute, pass through hydraulic performance decline.Due to the difference of influent quality, polluting the material of reverse osmosis membrane, to comprise hydrated metal oxide, carbonate, Sulfates, silicic acid class, organic matter class, microbiology class etc. multiple.Eddy current can be formed by clear water on film surface for comparatively loose dirt and wash away removal, the method for Chemical cleaning then must be taked to carry out dissolving for more solid dirt and remove.For the pollutant of heterogeneity, the chemical cleaning solution taking different formulations is needed to clean: the cleaning of alkaline cleaning fluid to microorganism, organic matter and silica containing EDTA and NaOH is more effective; HCl solution then has good cleaning performance to metal oxide colloids, hardness (calcium ion and magnesium ion), carbonate pollutant; Solution of sodium bisulfite has good effect for the microorganism killed in reverse osmosis membrane; The alternately cleaning of NaOH solution and HCl solution is then needed for organic matter class, silicates pollutant, then adopts the cleaning fluid adding EDTA in NaOH solution to remove for Sulfates pollutant.
Existing reverse osmosis membrane cleaning technique scheme is mainly divided into on-line cleaning and off-line to clean two kinds:
Reverse osmosis membrane on-line cleaning, be that cleaning fluid pours into the putamina and pipe-line system that reverse osmosis membrane assembly is housed from water inlet by the pressure utilizing water pump to provide, cleaning fluid is full of reverse osmosis membrane separation system and circulates in cleaning fluid tank and system.The pipe blow-through that reverse osmosis membrane on-line cleaning system comprises pressure vessel for reverse osmosis, inlet channel, water production pipeline, dense waterpipe and is connected with counter-infiltration system inlet channel, pipe blow-through is provided with cartridge filter, scavenging pump, purge tank successively, counter-infiltration system water production pipeline is provided with cleaning return duct and is connected with purge tank, and pipe blow-through is provided with check-valves and flowmeter.Key step is divided into:
(1) wash online: utilize and general produce water conservancy project process flow, carry out large discharge, the washing away of high flow rate, the pollutant on film surface is rinsed out.
(2) chemical cleaning online: pump in reverse osmosis membrane pipe from water inlet by cleaning fluid, soaks a period of time, after pollutant dissolving comes off, then cleans with reverse osmosis membrane product water, can more up hill and dale by contaminant removal.
The off-line cleaning of reverse osmosis membrane has multiple method, describes respectively below.
Utility model patent (No.ZL200420033221.0) describes a kind of washing unit with reverse osmosis membrane, its structure is comparatively simple, only can monitor the water inlet conductance of reverse osmosis membrane and produce water conductivity, and the product water performance indications of reverse osmosis membrane can not be provided, therefore, cleaning performance cannot be judged when carrying out Chemical cleaning with this device; In addition, because this device only has a soda liquor container, carrying out acid, alkali is when alternately cleaning, then need waste discharge repeatedly and repeatedly configure different types of cleaning fluid, causes a large amount of waste of chemical reagent and contaminated environment; Without atmospheric valve bottom this device soda liquor container, cleaning fluid thoroughly discharges comparatively difficulty; Although this system many reverse osmosis modules are arranged in parallel, during cleaning, also can only carry out unimodule cleaning, can not simultaneously in parallelly clean, if cleaning in parallel simultaneously, then there is drawback during above-mentioned on-line cleaning.
Utility model patent (ZL200520025713.X, 200520025746.4) improve again on above-mentioned patent basis, relate generally to off-line cleaning and the on-line cleaning device of reverse osmosis membrane assembly, two kinds of devices achieve the fresh water reverse cleaning of reverse osmosis membrane.The back pressure of diaphragm very low (Tao Shi reverse osmosis membrane product requirement back pressure≤0.35bar) is required in reverse osmosis membrane use procedure, if utilize this system to carry out fresh water reverse cleaning to reverse osmosis membrane, backwashing pump institute's applied pressure and reverse osmosis membrane surface pressing difference can not be excessive, because this increasing the operation easier of reverse cleaning, and be easy to the functional membrane of reverse-osmosis membrane element to puncture, cause membrane component to be scrapped.In addition, this device can clean many reverse osmosis membrane original papers simultaneously, and its effect and reverse osmosis membrane on-line cleaning similar process, cleaning performance is not ideal enough.
A kind of multifunctional off-line cleaning device for reverse osmosis membrane (200510016025.1) also can realize the back flush of reverse osmosis membrane fresh water, partial properties parameter after reverse osmosis membrane also can be provided to clean, but because this device cleans branched reverse osmosis membrane assembly in parallel simultaneously, cause the reverse osmosis membrane of severe contamination can not obtain Chemical cleaning up hill and dale; Conductivity meter is arranged on the outlet of total pure water and total dense water out, and its desalination obtained, product water-based can react the parameter of whole purging system, but not the performance parameter of single reverse osmosis membrane, testing result cannot judge the quality of every reverse osmosis membrane cleaning performance; In addition, the fresh water that this system produces is not back to soda liquor container, and concentration of lotion is increased gradually.Eluted pollutant will cause pollutant levels in cleaning fluid to improve gradually, without filter during cleaning concentrate recirculation, cause the particulate matter washed down again to enter membrane module interlayer, may cause the damage of membrane surface.
A soda liquor container is provided with in the offline model washing unit with reverse osmosis membrane that utility model patent (ZL200620108379.9) describes, the quick-replaceable of different cleaning fluid can not be realized, the preparation of cleaning fluid is also comparatively difficult with discharge, waste chemical reagent, also cannot realize the back flush procedure of pure water.
Also have a kind of cleaning method (ZL200710036315.1) of film to be disintegrated by the coiled reverse osmosis membrane after polluting, every page of diaphragm is cleaned respectively, utilizes the film backrush that industrial process will be disintegrated afterwards, then fw frp shell.Although film surface smut can thoroughly clean by the method, owing to film body to be taken apart the compressive property reducing film, thus cause the more difficult cleaning of the dirt in fenestra, and the method complex process, complex operation, cost are higher, are unfavorable for promoting.
1-8 the membrane module that be installed in series often is propped up in putamina in reverse osmosis water treatment system, according to on-line cleaning method, cleaning fluid pours into the putamina and pipe-line system that reverse osmosis membrane assembly is housed from water inlet by the pressure utilizing water pump to provide, and cleaning fluid is full of reverse osmosis membrane separation system and circulates in cleaning fluid tank and system.Because the pollutant that membrane module strips down constantly circulates in systems in which, thus finally can pollute cleaning fluid, therefore on-line cleaning technology has cleaning performance difference, cleaner membrane module is caused to the technical problem of secondary pollution.On-line cleaning formulates cleaning program and cleaning parameters according to whole system operation conditions, but the membrane module pollution level of diverse location is different in same putamina, according to identical cleaning parameters, scavenging period, rinse liquid temperature, operating pressure, drug concentration are all identical, only partly can recover the running status of whole system, not reach best cleaning performance.Usually need strengthen chemical levels to reach optimal cleaning effect, or extend scavenging period, certain threat can be caused to membrane module.In addition, on-line cleaning is as a kind of reverse osmosis membrane system cleaning maintenance, impact sterilization and the regular means protected, and the effect of cleaning when facing reverse osmosis membrane assembly serious pollution is undesirable, and to some insoluble mechanicalness impurity without any effect.
Off-line cleaning utilizes special cleaning putamina to clean single reverse osmosis membrane assembly, first drawn off from system putamina by assembly and reinstall cleaning putamina during cleaning, cleans complete drawing off from cleaning putamina and put in back system putamina relaying reforwarding row.Cleaning process need be loaded and unloaded repeatedly to membrane module, and coordinates the work such as pipeline valve switching, and can only clean 1 ~ 3 putamina, procedure complexity at every turn, and waste time and energy, operating efficiency is lower, cannot carry out the quick continuous wash of large quantities of membrane module.Because space between diaphragm is very little, connect the impact of caliber by putamina, in putamina, cleaning fluid flow velocity is low, washes away dynamics not to pollutant, and be difficult in the short time, dirt dirt be removed to internal incrustation, dirty stifled serious assembly, cleaning performance is poor.Existing off-line cleaning method cleaning performance is certainly not ideal enough.
Common chemical cleaning solution generally adopts 2% hydrochloric acid or 2% sodium hydroxide solution, and because it belongs to strong acid and strong base solution, long-time cleaning can cause damage to membrane module.For avoiding acid-base neutralization reaction between liquid, needing first to rinse with clear water before replacing liquid, the cleaning fluid in pipeline and putamina system is rinsed well, then coordinating pipeline valve to switch the cleaning process of carrying out another kind of cleaning fluid.Due to pipeline putamina system complex, inner space is comparatively large, and the clear water amount of rinsing needs is more, increases cleaning liquid and rinse dosage widely, and cause cleaning agent and clear water waste to increase and clean cost, after dilution, the discharge of cleaning liquid causes problem of environmental pollution.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of reverse osmosis membrane assembly continuous cleaning device and utilize this device to clean the method for reverse osmosis membrane assembly.
Technical scheme of the present invention is:
The continuous off-line cleaning device of a kind of reverse osmosis membrane assembly, comprising: for soaking and clean the rinse bath of reverse osmosis membrane assembly, and described rinse bath has several and separate; Also comprise the drive transmission unit for driving reverse osmosis membrane assembly continuous wash in separate rinse bath.
On the basis of such scheme, described drive transmission unit comprises motor, turning cylinder and chain, and described motor drives chain to rotate by driving turning cylinder, and reverse osmosis membrane assembly is connected on chain.
On the basis of such scheme, described chain is chain, and comprise the first chain and the second chain, reverse osmosis membrane assembly detachable connection is between chain.
On the basis of such scheme, the scavenging pump for driving the cleaning fluid in rinse bath to circulate is set in described rinse bath.
On the basis of such scheme, described reverse osmosis membrane assembly passes through clip detachable connection between chain; Described clip is fixed on inside chain.
On the basis of such scheme, described scavenging pump is connected with the washing hose for cleaning reverse osmosis membrane assembly, the other end of washing hose is connected with cleaning end cap, and described cleaning end cap is for connecting one end of reverse osmosis membrane assembly.
On the basis of such scheme, described reverse osmosis membrane assembly is connected between chain inclined, and in cleaning running, the difference in height at reverse osmosis membrane assembly two ends is 5-10cm.
On the basis of such scheme, described washing hose is arranged the cartridge filter for filtering rinse bath cleaning liquid inside.
On the basis of such scheme, described chain extends respectively to two ends at the two ends of rinse bath, form installing zone and dismounting district, described installing zone is for being arranged on chain by reverse osmosis membrane assembly before washing, and described dismounting district is for pulling down reverse osmosis membrane assembly from chain after the washing.
On the basis of such scheme, also comprise the spray tank for injecting cleaning fluid in rinse bath.
On the basis of such scheme, also comprise the waste liquid pool for collecting rinse bath cleaning liquid inside.
On the basis of such scheme, also comprise heater, described heater is used for the cleaning fluid in heated wash groove.
On the basis of such scheme, described bottom of rinse bath is rectangular pyramid shape.
On the basis of such scheme, described rinse bath preferably uses 3.
Clean a method for reverse osmosis membrane assembly, employ the continuous off-line cleaning device of above-mentioned reverse osmosis membrane assembly.
Beneficial effect of the present invention:
Adopt off-line cleaning method, the membrane module polluted is immersed in cleaning liquid bath, equipment adopts parallel way to clean separately branched membrane module simultaneously, one of filter washing water inlet end cap and membrane module is fixed on chain with clip, assembly other end clip is fixed on opposite side chain, assembly is easy for installation, eliminates the disassembly process of assembly complexity, saves labor.Install the membrane module of equal number in each cleaning liquid bath, the kind of drive of chain makes the automaticity of this equipment improve, and the membrane module in different cleaning liquid baths runs simultaneously, and whole piece streamline has continuity, saves scavenging period, improves cleaning efficiency.
The chain cleaning liquid bath both sides in this device has the difference in height of 5-10 centimetre, membrane module has certain inclination angle after installing, when membrane module cleans complete in a kind of medicament, under chain drive, membrane module promotes gradually, filter washing water inlet end cap is opened when an assembly high position exposes liquid level, when assembly low level leave liquid level enter next cleaning liquid bath time, medicament flows in corresponding cleaning liquid bath automatically, front a kind of wash liquid stream is avoided to enter in rear one cleaning liquid bath, medicament acid-base neutralization can be avoided, save dosing, a kind of cleaning fluid after front a kind of contaminated cleaning solution can be avoided again.
The cleaning fluid trench bottom of this equipment is rectangular pyramid shape, when equipment is out of service, in cleaning fluid, sediment automatically sinks to bottom and forms bed mud, can by bottom pollutant emission to waste liquid pool when equipment is opened again, add the new cleaning fluid of corresponding equivalent, reduce the dosage of new cleaning fluid and reduce the discharge capacity of used wiping solution, both cost-saving, environmental protection again.
This reverse osmosis membrane assembly Automatic continuous off-line cleaning equipment, structure is simple, operation is convenient, be convenient to adjustment, cleaning performance is remarkable, is specially adapted to the cleaning of the field large reverse osmosis system membranes assemblies such as Drinking Water desalination, high purity water process, Seawater Desalination Project.This automation degree of equipment is high, and operating process is simplified, and save complicated loading and unloading, this equipment greatly shortens scavenging period, saves manpower to a great extent, increases work efficiency.
Performance after this cleaning method can ensure Membrane cleaning reaches or puts down close to new film water, and greatly reduce the film replacement cost of enterprise, the use of chemical agent is with strong points, descaling rate is high, has stopped the damage of on-line cleaning to film.
This equipment is widely used, adaptable, can be used for the Chemical cleaning of the reverse-osmosis membrane element of different brands different model by changing clip model.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation (not comprising waste liquid pool);
Fig. 2 is apparatus of the present invention structural representations;
Fig. 3 is scavenging pump of the present invention, washing hose and cleaning end cover structure schematic diagram;
Fig. 4 is rinse bath of the present invention and chain structure schematic diagram;
Fig. 5 is clip of the present invention fixing cleaning end cap and reverse osmosis membrane assembly schematic diagram.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the continuous off-line cleaning device of a kind of reverse osmosis membrane assembly, comprising: for soaking and clean the rinse bath 2 of reverse osmosis membrane assembly 6, and described rinse bath 2 has several and separate; In separate rinse bath 2, different cleaning fluids is housed; Also comprise the drive transmission unit for driving reverse osmosis membrane assembly continuous wash in separate rinse bath.Described drive transmission unit comprises motor 10, turning cylinder 15 and chain 13, and described motor 10 drives chain to rotate by driving turning cylinder 15, and reverse osmosis membrane assembly 6 is connected on chain.Described chain 13 is chain, and comprise the first chain 13-1 and the second chain 13-2, reverse osmosis membrane assembly 6 detachable connection is between chain.In order to realize better cleaning, improve cleaning efficiency, on the basis of embodiment 1 equipment, the scavenging pump 7 circulated for the cleaning fluid driven in rinse bath 1 is set in rinse bath 1.Described reverse osmosis membrane assembly 6 passes through clip 8 detachable connection between chain; Described clip 8 is fixed on inside chain.Described scavenging pump 7 is connected with the washing hose 4 for cleaning reverse osmosis membrane assembly 6, the other end of washing hose 4 is connected with cleaning end cap 12, and described cleaning end cap 12 is for connecting one end of reverse osmosis membrane assembly 6.Described reverse osmosis membrane assembly 6 is connected between chain inclined, and in cleaning running, the difference in height at reverse osmosis membrane assembly two ends is 5-10cm.Described washing hose 4 is arranged the cartridge filter 3 for filtering rinse bath 2 cleaning liquid inside, object maximizes to keep the pure of cleaning fluid.In order to improve cleaning efficiency, described chain extends respectively to two ends at the two ends of rinse bath, form installing zone 1 and dismounting district 5, described installing zone 1 is for being arranged on chain by reverse osmosis membrane assembly 6 before washing, and described dismounting district 5 is for pulling down reverse osmosis membrane assembly 6 from chain after the washing.Also comprise the spray tank 11 for injecting cleaning fluid in rinse bath 2.Equipment also comprises the waste liquid pool 9 for collecting rinse bath cleaning liquid inside; Rinse bath 2 bottom design is rectangular pyramid shape, when equipment is out of service, in cleaning fluid, sediment automatically sinks to bottom and forms bed mud, can by bottom pollutant emission to waste liquid pool 9 when equipment is opened again, add the new cleaning fluid of corresponding equivalent, reduce the dosage of new cleaning fluid and reduce the discharge capacity of used wiping solution, both cost-saving, environmental protection again.In order to increase cleaning efficiency, improving cleaning performance, heater 14 is set in rinse bath 2, for the cleaning fluid in heated wash groove.
Embodiment 2
Composition graphs 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, to use 3 rinse baths, be described in detail the method utilizing the equipment of embodiment 1 to clean reverse osmosis membrane assembly, specific as follows:
1) at installing zone 1 first reverse osmosis membrane assembly 6 is fixed on the inner side on chain 13 with clip 8, open motor 10, motor 10 drives the first chain 13-1 and the second chain 13-2 to be synchronized with the movement by turning cylinder 15, first reverse osmosis membrane assembly 6 also moves together simultaneously, when first reverse osmosis membrane assembly 6 moves to the centre position of the first rinse bath 2-1, stop motor 10, open the clip 8 of reverse osmosis membrane assembly 6 side, cleaning end cap 12 and reverse osmosis membrane assembly 6 are tightly connected, with clip 8, cleaning end cap 12 and reverse osmosis membrane assembly 6 are fixed again afterwards, make wash liquid stream in reverse osmosis membrane assembly 6 identical to current direction when running with reverse osmosis membrane assembly 6
2) valve between the first spray tank 11-1 and the first rinse bath 2-1 is opened, cleaning liquid injects the first rinse bath 2-1 from the first spray tank 11-1 mesolow, low speed, liquid level is made just not have reverse osmosis membrane assembly 6, the heater 14 opened afterwards in the first rinse bath 2-1 starts heating, after reaching predetermined temperature, membrane module starts to soak, soak the valve terminated between rear unlatching first scavenging pump 7-1 and cleaning end cap 12, open the first scavenging pump 7-1, make cleaning fluid wash cycles in reverse osmosis membrane assembly 6;
3) at installing zone 1 second batch reverse osmosis membrane assembly 6 clip 8 is fixed on the inner side on chain 13, after first membrane module cleans and terminates in the first rinse bath 2-1, close the first scavenging pump 7-1, open motor 10, first membrane module is made to advance in the inclined plane of the first rinse bath 2-1, first membrane module all exposes the liquid level in the first rinse bath 2-1, close the valve between the first scavenging pump 7-1 and cleaning end cap 12, open the valve between the first spray tank 11-1 and cleaning end cap 12, the valve between the first spray tank 11-1 and cleaning end cap 12 is closed after 1 minute again with the new liquid flushing membrane assembly in the first spray tank 11-1, pull down the cleaning end cap 12 of first membrane module,
4) open motor 10, make first membrane module 6 enter the centre position of the second rinse bath 2-2, and second batch membrane module under the liquid level that submerges, connects the cleaning end cap 12 of two batches of membrane modules in the first rinse bath 2-1 centre position;
5) valve between the second spray tank 11-2 and the second rinse bath 2-2 is opened, make cleaning liquid low pressure, low speed injects the second rinse bath 2-2, and liquid level did not have first reverse osmosis membrane assembly just, the heater 14 opened in the second rinse bath 2-2 starts heating, after reaching predetermined temperature, start to soak, soak the valve terminated between rear unlatching first scavenging pump 7-1 and cleaning end cap 12, and open the first scavenging pump 7-1; Open the valve between the second scavenging pump 7-2 and cleaning end cap 12 simultaneously, and open the second scavenging pump 7-2; Make cleaning fluid wash cycles in reverse osmosis membrane assembly 6;
6) at installing zone 1, the 3rd batch of reverse osmosis membrane assembly 6 clip 8 is installed and is fixed on inner side on chain 13, when first, after two batches of membrane module cleanings terminate, close two scavenging pumps, open motor 10, make first, two batches of membrane modules advance in the inclined plane of rinse bath 2, first, after two batches of membrane modules all expose liquid level, close the valve between scavenging pump 7 and cleaning end cap 12, open the valve between the first spray tank 11-1 and corresponding cleaning end cap 12 and the valve between the second spray tank 11-2 and corresponding cleaning end cap 12 respectively, the valve between the valve of between the first spray tank 11-1 and corresponding cleaning end cap 12 and the second spray tank 11-2 and corresponding cleaning end cap 12 is closed after 1 minute again with new liquid flushing membrane assembly, pull down first, the cleaning end cap 12 of two batches of membrane modules,
7) motor 10 is opened, the 3rd batch of membrane module is made to enter the first rinse bath 2-1 centre position and under the liquid level that submerges, second batch membrane module is in the second rinse bath 2-2 centre position and under the liquid level that submerges, first membrane module enters the 3rd rinse bath 2-3 centre position, connects the cleaning end cap 12 of three batches of membrane modules;
8) valve between the 3rd spray tank 11-3 and the 3rd rinse bath 2-3 is opened, cleaning liquid low pressure, low speed is made to inject the 3rd rinse bath 2-3, and liquid level did not have first reverse osmosis membrane assembly just, the heater 14 opened in the 3rd rinse bath 2-3 starts heating, after reaching predetermined temperature, start to soak, soak the valve terminated between rear unlatching first scavenging pump 7-1 and cleaning end cap 12, and open the first scavenging pump 7-1; Open the valve between the second scavenging pump 7-2 and cleaning end cap 12 simultaneously, and open the second scavenging pump 7-2; Open the valve between the 3rd scavenging pump 7-3 and cleaning end cap 12 simultaneously, and open the 3rd scavenging pump 7-3; Make cleaning fluid wash cycles in reverse osmosis membrane assembly 6;
9) at installing zone 1, the 4th batch of reverse osmosis membrane assembly 6 clip 8 is installed and is fixed on inner side on chain 13, when first, two, after three batches of membrane module cleanings terminate, close three scavenging pumps, open motor 10, make first, two, three batches of membrane modules advance in the inclined plane of rinse bath 2, first, two, after three batches of membrane modules all expose liquid level, close the valve between all scavenging pumps 7 and cleaning end cap 12, open the valve between the first spray tank 11-1 and corresponding cleaning end cap 12 respectively, valve between second spray tank 11-2 and corresponding cleaning end cap 12 and the valve between the 3rd spray tank 11-3 and corresponding cleaning end cap 12, the valve between the first spray tank 11-1 and corresponding cleaning end cap 12 is closed after 1 minute again with new liquid flushing membrane assembly, valve between second spray tank 11-2 and corresponding cleaning end cap 12 and the valve between the 3rd spray tank 11-3 and corresponding cleaning end cap 12, pull down first, two, the cleaning end cap 12 of three batches of membrane modules,
10) motor 10 is opened, the 4th batch of membrane module is made to enter the first rinse bath 2-1 centre position and under the liquid level that submerges, the 3rd batch of membrane module is in the second rinse bath 2-2 centre position and under the liquid level that submerges, second batch membrane module enters the 3rd rinse bath 2-3 centre position, connect second and third, the cleaning end cap 12 of four batches of membrane modules;
11) first membrane module is pulled down from chain 13 clip 8, terminates to the cleaning of this first reverse osmosis membrane assembly 6, second and third, the multiple above step of four batch weight, realize the cleaning of continuous off-line.
Embodiment 3
Certain factory adopts counter-infiltration system as pro desalting technique, with homemade well well water for process water source, enter reverse osmosis unit after pretreatment, this system is one-level two-period form totally 5 cover reverse osmosis units, water-yielding capacity is 500t/h, and membrane module is U.S. DOW Tao Shi RO reverse osmosis membrane; In operation, this system has occurred after 2 years that aquifer yield decline, system pressure and pressure reduction raise phenomenon, in order to meet enterprise's production requirement, after the reverse osmosis membrane assembly polluted is dismantled, continuous off-line cleaning technique of the present invention and equipment is adopted to clean to improve the operational effect of counter-infiltration system to this membrane module, use 3 rinse baths, method is identical with embodiment 2.First, according to practical operation situation, the dirt polluting reverse osmosis membrane assembly is analyzed, sample is retained by what gather waste and old reverse osmosis membrane surface, carry out respectively visually observing, the qualification trapped substance sample such as chemical analysis, ESEM (SEM), analysis result is in Table 1-2, and the main pollution condition of native system is:
1) there is serious Homonemeae and biological sludge in industrial pollution in reverse osmosis membrane assembly, and water flux reduces, and intake pressure raises; Getting soil analysis COD content is 13.8mg/L;
2) the insoluble pollutant such as silt, suspension, measures acid non-soluble substance and accounts for 62.04% of gross contamination thing;
Table 1 pollutant analysis data (one) *
* 0.4g dirt sample is dissolved in 1000mL water.
Table 2 pollutant analysis data (two) *
* 0.5g dirt sample is dissolved in the HCI of 100mL 1+1.
According to the film dirt composition analysis result polluting reverse osmosis membrane, utilize the cleaning equipment for reverse osmosis membrane shown in Figure of description, use the cleaning agent of the present invention for different film dirt to clean.
Preparation cleaning solution: use pure water allotment cleaning solution: mix 0.1% NaOH+0.25% dodecyl sodium sulfate with the ratio of 1:1, put into spray tank 11-1, cleaning temperature 25 DEG C, pH value is 10.
0.1% NaOH+1.0%Na is mixed with the ratio of 1:1
4eDTA, puts into spray tank 11-2, cleaning temperature 25 DEG C.
Spray tank 11-3 puts into pure water, and temperature is adjusted to 25 DEG C.
In three rinse baths, soak time is 2h, and scavenging period is 55min.Final reverse osmosis membrane wash result is shown in Table 3.
Performance comparison before and after the cleaning of table 3 reverse osmosis membrane
Embodiment 4
Certain steam power plant, the treatment system of boiler water-filling adopts the treatment process that counter-infiltration is main desalination, the multiple bed of one-level is smart desalination, and effluent quality remains on 5 μ Scm
-1below.Reverse osmosis deaslination technology has consequence in this boiler of power plant supplementing water process, the flux running reverse osmosis membrane after 2 years declines, system working pressure improves, in order to recover the normal ability to work of film device, extend the service life of membrane component, utilize reverse osmosis membrane assembly of the present invention continuous off-line cleaning technique and equipment automatically to be cleaned by the pollutant on reverse osmosis membrane surface, use the technique cleaning of embodiment 2.
Employing visually observes the method combined with sample examination and judges that the soil types of reverse osmosis membrane assembly is: one section of reverse osmosis membrane assembly pollutes and is mainly iron colloid, bacterium, microorganism and organic adsorption fouling; Calcium in two sections of reverse osmosis membrane assemblies, magnesium ion content are higher.
Configuration cleaning fluid:
Use pure water allotment cleaning solution: mix 0.1% NaOH+0.25% sodium dodecyl sulfate aqueous solution with the ratio of 1:1, put into spray tank 11-1, cleaning temperature 25 DEG C, pH value is 10.
1.0% sodium hydrogensulfite puts into spray tank 11-2, and temperature is adjusted to 35 DEG C.
Spray tank 11-3 puts pure water, and temperature is adjusted to 25 DEG C.
Soaking in three rinse baths is all 4h, and cleaning is all 1h.Final wash result is in table 4.
Table 4 system reverse osmosis membrane assembly cleaning performance
As can be seen from Table 4, under same intake pressure condition, produce discharge and improve 24.6%, run total pressure head and reduce 0.13MPa, reduce by 26%, cleaning performance is obvious, reaches the set goal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the continuous off-line cleaning device of reverse osmosis membrane assembly, is characterized in that: comprising: for soaking and clean the rinse bath of reverse osmosis membrane assembly, and described rinse bath has several and separate; Also comprise the drive transmission unit for driving reverse osmosis membrane assembly continuous wash in separate rinse bath.
2. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 1, it is characterized in that: described drive transmission unit comprises motor, turning cylinder and chain, described motor drives chain to rotate by driving turning cylinder, and reverse osmosis membrane assembly is connected on chain.
3. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 2, is characterized in that: described chain is chain, comprise the first chain and the second chain, reverse osmosis membrane assembly detachable connection is between chain.
4. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 1,2 or 3, is characterized in that: arrange the scavenging pump for driving the cleaning fluid in rinse bath to circulate in described rinse bath.
5. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 3, is characterized in that: described reverse osmosis membrane assembly passes through clip detachable connection between chain; Described clip is fixed on inside chain.
6. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 4, it is characterized in that: described scavenging pump is connected with the washing hose for cleaning reverse osmosis membrane assembly, the other end of washing hose is connected with cleaning end cap, and described cleaning end cap is for connecting one end of reverse osmosis membrane assembly.
7. the continuous off-line cleaning device of the reverse osmosis membrane assembly according to any one of claim 3-6, it is characterized in that: described reverse osmosis membrane assembly is connected between chain inclined, in cleaning running, the difference in height at reverse osmosis membrane assembly two ends is 5-10cm.
8. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 7, it is characterized in that: described chain extends respectively to two ends at the two ends of rinse bath, form installing zone and dismounting district, described installing zone is for being arranged on chain by reverse osmosis membrane assembly before washing, and described dismounting district is for pulling down reverse osmosis membrane assembly from chain after the washing.
9. the continuous off-line cleaning device of reverse osmosis membrane assembly according to claim 8, is characterized in that: also comprise the spray tank for injecting cleaning fluid in rinse bath, for collecting the waste liquid pool of rinse bath cleaning liquid inside and the heater for the cleaning fluid in heated wash groove; Described bottom of rinse bath is rectangular pyramid shape; Described washing hose is arranged the cartridge filter for filtering rinse bath cleaning liquid inside.
10. clean a method for reverse osmosis membrane assembly, it is characterized in that, employ the continuous off-line cleaning device of reverse osmosis membrane assembly described in any one of claim 1-9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921027A (en) * | 2016-06-30 | 2016-09-07 | 邢志会 | Membrane assembly cleaning device |
| CN109046031A (en) * | 2018-09-04 | 2018-12-21 | 许昌学院 | The cleaning method and cleaning system of reverse osmosis membrane assembly |
| CN112915798A (en) * | 2021-02-08 | 2021-06-08 | 华盛龙环保科技(宁夏)有限公司 | Portable membrane column belt cleaning device that facilitates use |
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|---|---|---|---|---|
| CN1840227A (en) * | 2005-11-11 | 2006-10-04 | 天津化工研究设计院 | Multifunctional off-line cleaning device for reverse osmosis membrane |
| CN200984496Y (en) * | 2006-09-28 | 2007-12-05 | 浙江四通环境工程有限公司 | Off-line type reverse osmosis membrane cleaner |
| CN204638013U (en) * | 2015-03-10 | 2015-09-16 | 青岛农业大学 | A kind of reverse osmosis membrane assembly continuous cleaning device |
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2015
- 2015-03-10 CN CN201510104686.3A patent/CN104707484B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840227A (en) * | 2005-11-11 | 2006-10-04 | 天津化工研究设计院 | Multifunctional off-line cleaning device for reverse osmosis membrane |
| CN200984496Y (en) * | 2006-09-28 | 2007-12-05 | 浙江四通环境工程有限公司 | Off-line type reverse osmosis membrane cleaner |
| CN204638013U (en) * | 2015-03-10 | 2015-09-16 | 青岛农业大学 | A kind of reverse osmosis membrane assembly continuous cleaning device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105921027A (en) * | 2016-06-30 | 2016-09-07 | 邢志会 | Membrane assembly cleaning device |
| CN109046031A (en) * | 2018-09-04 | 2018-12-21 | 许昌学院 | The cleaning method and cleaning system of reverse osmosis membrane assembly |
| CN109046031B (en) * | 2018-09-04 | 2021-07-23 | 许昌学院 | Cleaning method and cleaning system of reverse osmosis membrane module |
| CN112915798A (en) * | 2021-02-08 | 2021-06-08 | 华盛龙环保科技(宁夏)有限公司 | Portable membrane column belt cleaning device that facilitates use |
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