CN101653701A - Method and device for chemically cleaning hollow fiber filtration membrane - Google Patents
Method and device for chemically cleaning hollow fiber filtration membrane Download PDFInfo
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- CN101653701A CN101653701A CN200810147164A CN200810147164A CN101653701A CN 101653701 A CN101653701 A CN 101653701A CN 200810147164 A CN200810147164 A CN 200810147164A CN 200810147164 A CN200810147164 A CN 200810147164A CN 101653701 A CN101653701 A CN 101653701A
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Abstract
The invention discloses a method and a device for chemically cleaning a hollow fiber filtration membrane. The method comprises that the surface of the filtration membrane of a membrane module is alternately cleaned in the positive direction and reverse direction by a cleaning liquid medicament in the device for chemically cleaning the hollow fiber filtration membrane; and the device comprises a positive cleaning medicinal tank connected with the membrane module to be cleaned through a pipe, a positive cleaning pump, a check valve and a self-control valve; an outlet pipe of the medicinal tank is connected with a water inlet of the positive cleaning pump; an water outlet pipe of the positive cleaning pump is connected with a water inlet of the membrane module to be cleaned through the checkvalve; a reflux water port of the membrane module is back to the medicinal tank through a pipe provided with the self-control valve; and a water permeating outlet is communicated with the medicinal tank through the pipe provided with the self-control valve; and the device also comprises a negative cleaning medicinal tank connected with the membrane module to be cleaned through a pipe, a negative cleaning power unit, a check valve and a self-control valve, wherein an outlet of the medicinal tank is connected with an inlet of the negative cleaning power unit through a pipe; an outlet of the negative cleaning power unit is connected with the water permeating outlet of the membrane module to be cleaned through a pipe provided with the check valve; and the water permeating outlet is communicated with the medicinal tank through the pipe provided with the self-control valve. The method and the device can effectively improve cleaning effect and prolong the service life of the membrane module.
Description
Technical field
The present invention relates to a kind of chemical cleaning method and device that can make the hollow fiber filter membrane that the Chemical cleaning soup back and forth cleans by the filter membrane membranous wall.
Background technology
In the last few years, the hollow fiber filter membrane widespread usage was in the fields such as pre-treatment of the purification of micro-polluted source water, middle water reuse, municipal sewage treatment and reuse, reverse osmosis deaslination technology.But the cost that how effectively controlling diaphragm pollutes, the reduction controlling diaphragm pollutes, the service life of membrane component and prolong have crucial meaning for the hollow fiber filter membrane large-scale promotion application.As everyone knows, hollow fiber filter membrane is when operation, filter membrane will be polluted inevitably, trapped substance in the filtrate can be deposited on the filter membrane surface, the dirt of holding back can stop up fenestra, macromolecular substances and colloid can be adsorbed onto the filter membrane surface gradually and form gel layer, particulate matters such as zoogloea class can deposit to the filter membrane surface and form cake layer, the deposition of these trapped substances all can increase the filtration resistance of filter membrane, remarkable decline of filter membrane flux or transmembrane pressure are significantly risen, thereby influence the stability of hollow fiber filter membrane system long-time running.By adopting cross-flow filtration, suitable working flux (subcritical flux) to filter, intermittently carrying out hydraulic reverse flushing, air water in the filter operation process and mix measures such as flushing and remove part and hold back dirt, filter membrane system can effectively be moved in the long time.But the film system pollutes and to make accumulation progressively in long-time running, organic dirt in the trapped substance and colloid pollution will progressively cause fenestra to stop up, some inorganic salts also can be on the film surface and the membranous wall internal incrustation, causes to filter required pressure and progressively rise the progressively decline of membrane flux.Have only the chemicals of use to clean, film properties is effectively restored.So adopting Chemical cleaning is thoroughly to remove the effective measures that filter membrane pollutes, recovers the membrane filtration ability, also is to keep the necessary work of filter membrane operation steady in a long-term in the membrane module, therefore, most of hollow fiber membrane device all comprise chemical cleaning system.
Chemical cleaning is to use the cleaning solution of the chemical agent preparation of certain density particular types that filter membrane is cleaned, and chemical agent can be the preparation of acid, alkali, oxidant, reducing agent, surfactant and mixed preparing thereof etc.
Consult shown in Figure 1, the chemically-cleaning device of existing hollow fiber filter membrane, comprise for explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 of placing the Chemical cleaning soup, this explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 with membrane module 13 to be cleaned between be connected by pipeline.The outlet of explosive barrel 11 connects the water inlet of forward scavenging pump 12 by pipeline, the water outlet of forward scavenging pump 12 connects membrane module to be cleaned 13 water inlets by pipeline through check-valves 14, membrane module 13 recycling effluent mouths are connected with explosive barrel 11 by pipeline and through Self controlling valve 16, the permeate water outlet of membrane module 13 is led to explosive barrel 11 by pipeline through Self controlling valve 15, thereby constitutes the work loop that forward cleans.
Consult shown in Figure 1, the chemically-cleaning device of existing hollow fiber filter membrane, when it cleans, earlier the Chemical cleaning soup for preparing is put into explosive barrel 11, start forward scavenging pump 12, open Self controlling valve 16, when closing Self controlling valve 15, the Chemical cleaning soup enters membrane module by check valve 14, gets back to explosive barrel 11 through internally piloted valve 16, realizes the flush clean to membrane module 13 filter membrane surfaces; Open Self controlling valve 15, when closing Self controlling valve 16, the Chemical cleaning soup enters membrane module by check valve 14, gets back to explosive barrel 11 through internally piloted valve 15, realize to see through filter membrane and to the cleaning of film; When Self controlling valve 15 and 16 is all opened, the Chemical cleaning soup enters membrane module by check valve 14, get back to explosive barrel 11 through internally piloted valve 15 and 16, realize the flush clean of part Chemical cleaning soup to membrane module 13 filter membrane surfaces, part Chemical cleaning soup sees through the cleaning of filter membrane to film.Closing forward scavenging pump 12 and each Self controlling valve 15 and at 16 o'clock, the Chemical cleaning soup is rested in the membrane module 13, filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing to the film surface.More than clean, the pollutant part on the film breaks away from from the film surface and stays in the cleaning fluid of explosive barrel 11, discharging at last with cleaning medicine reaction decomposes, part.
From the above, the chemically-cleaning device of existing hollow fiber filter membrane can be by the method for Chemical cleaning, with the trapped substance of filter membrane surface deposition from filter membrane surface wash-out, improve the filter membrane flux, reach and recover the filter membrane service behaviour, prolong the filter membrane effect in service life.Yet any cleaning all can not be removed pollutant fully, and the obstruction decay of filter membrane is inevitable.Seeking more effective cleaning method, prolong the service life of filter membrane as much as possible, is the important topic during film is used.
In the cleaning of hollow-fibre membrane, oppositely clean, both allowed cleaning fluid see through face from filtering reverse rightabout, effective especially.This is because pollutant and gel layer are in the filter process, under the pressure effect of pump, progressively form at the film surface deposition, general forward cleans, can only play a part to wash away, and oppositely clean, then be to pressurize from the side that sees through of film, allow the cleaning fluid direction pass through face, pollutant and gel layer are played the effect of peeling off, and the dirt that washes is discharged system with backwash water.This body structure of hollow-fibre membrane has the performance that can tolerate buffer brake, can use this effective cleaning means of reverse cleaning, and this also is one of hollow-fibre membrane main feature of being better than other form filter membranes.
Yet, in the hollow-fibre membrane use in the past, when Chemical cleaning, can not use reverse cleaning means, main cause is that the Chemical cleaning medicine liquid volume is limited, need the regular hour when cleaning again, therefore cleaning soup need use in circulation, will produce pollution and clean soup to filtration one side of filter membrane in recycling process.
Consult shown in Figure 1, utilize the chemically-cleaning device of existing hollow fiber filter membrane, if in the time of will controlling the Chemical cleaning soup and oppositely clean, then must increase a work loop and valve 17 and 18 (shown in the dotted line among Fig. 1), during use valve 18 is closed, valve 17 is opened, yet such work loop is impracticable, the work loop of (among Fig. 1 shown in the dotted line) because increase like this, oppositely clean, washing away the trapped substance that gets off in the time of will making cleaning enters in the explosive barrel 11, cause the pollution of Chemical cleaning soup, the Chemical cleaning soup that is polluted is recycled to the filtration side of filter membrane again through forward scavenging pump 12, to cause secondary pollution to the filtration side of filter membrane, and such pollution is unallowed.Therefore, the chemically-cleaning device of existing hollow fiber filter membrane can only be implemented unidirectional washing and cleaning operation.Trapped substance for the hollow fiber filter membrane surface deposition, unidirectional cleaning performance can not be fully with thorough, be difficult to guarantee that the filter membrane service behaviour is returned to original level, the pollutant long-term accumulation that a part is held back is blocked in the filter membrane surface, cause the filter membrane service behaviour progressively to decay, even lose use value.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming of existing cleaning technique and device existence, and provide a kind of chemical cleaning method and device of hollow fiber filter membrane, it increases by one by explosive barrel, oppositely clean the reverse cleaning loop that actuating unit and Self controlling valve constitute on the basis of original technology and apparatus structure, can avoid filter membrane being filtered the pollution of side from the trapped substance that the filter membrane surface clean is got off, make the Chemical cleaning soup back and forth realize back and forth washing away to filter membrane by filter membrane, effectively improve cleaning performance, the service life of membrane component and prolong.
The present invention is realized by following technical scheme.
The chemical cleaning method of hollow fiber filter membrane of the present invention is characterized in that, it is included in the chemically-cleaning device of hollow fiber filter membrane by cleaning soup forward cleaning process and reverse cleaning process are carried out in the filter membrane surface of membrane module.
The chemical cleaning method of aforesaid hollow fiber filter membrane, wherein clean forward cleaning process that soup carries out the filter membrane surface of membrane module and oppositely cleaning process for hocketing continuously.
The chemical cleaning method of aforesaid hollow fiber filter membrane wherein cleans soup and the forward cleaning process is carried out on the filter membrane surface of membrane module comprises step: (A) the Chemical cleaning soup for preparing put into explosive barrel 11; (B) start forward scavenging pump 12; (C) open Self controlling valve 16, close Self controlling valve 15, allow the Chemical cleaning soup enter membrane module 13, get back to explosive barrel 11 and realize flush clean membrane module 13 filter membrane surfaces through internally piloted valve 16 by check valve 14; (D) close Self controlling valve 16, open Self controlling valve 15, allow the Chemical cleaning soup enter in the membrane module 13, get back to explosive barrel 11, realize to see through filter membrane and the cleaning of film through internally piloted valve 15 by check valve 14; (E) open Self controlling valve 15 and 16, allow the Chemical cleaning soup enter membrane module 13 by check valve 14, get back to explosive barrel 11 through internally piloted valve 15 and 16, realize the flush clean of part Chemical cleaning soup to membrane module 13 filter membrane surfaces, part Chemical cleaning soup sees through filter membrane and to the cleaning of film; (F) close forward scavenging pump 12 and Self controlling valve 15 and 16, the Chemical cleaning soup is rested in the membrane module 13, filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing the film surface; Described cleaning soup carries out reverse cleaning process to the filter membrane surface of membrane module and comprises step: (G) close Self controlling valve 15 and 16, open Self controlling valve 24, under the effect of forward scavenging pump 12, the Chemical cleaning soup enters in the membrane module 13, seeing through filter membrane then enters in the explosive barrel 21, when the Chemical cleaning soup in the explosive barrel 21 rises to the height liquid level of regulation, liquid automatic control device 25 work in the explosive barrel 21, forward scavenging pump 12 and Self controlling valve 24 are closed in control, open Self controlling valve 16 and reverse scavenging pump 22, make the cleaning chemistry of filtration clean soup through check valve 24 and enter in the filtration mouth of a river of membrane module 13, filter membrane is washed through film from the rightabout of membrane filtration, allow the Chemical cleaning soup after washing get back to explosive barrel 11; (H) when the Chemical cleaning soup in the explosive barrel 21 drops to the low liquid level of regulation, 25 work of liquid automatic control device are controlled reverse scavenging pump 22 and are closed, and finish reverse cleaning; (I) when oppositely cleaning is finished, open Self controlling valve 24, close Self controlling valve 16, forward scavenging pump 12 starts, and repeated forward is cleaned action, carries out next reciprocation cycle, until the scavenging period of setting.
The chemical cleaning method of aforesaid hollow fiber filter membrane wherein oppositely cleans the clean soup that the cleaning soup that uses is the process membrane filtration.
The chemically-cleaning device of hollow fiber filter membrane of the present invention is used for polluted hollow fiber film assembly is carried out Chemical cleaning; Comprise for explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 of placing the Chemical cleaning soup, this explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 with membrane module 13 to be cleaned between be connected by pipeline; These explosive barrel 11 outlet conduits connect the water inlet of forward scavenging pump 12, and the outlet conduit of forward scavenging pump 12 connects membrane module 13 water inlets to be cleaned through check-valves 14; Explosive barrel 11 is got back to through the pipeline that is provided with Self controlling valve 16 in the membrane module 13 backflow mouths of a river; The pipeline of permeate water outlet through being provided with Self controlling valve 15 of membrane module 13 leads to explosive barrel 11; It is characterized in that: also comprise explosive barrel 21, oppositely clean actuating unit 22, check-valves 23 and Self controlling valve 24; This explosive barrel 21, oppositely clean between actuating unit 22, check-valves 23 and Self controlling valve 24 and the membrane module 13 to be cleaned and be connected by pipeline; The outlet of this explosive barrel 21 is connected with the import of oppositely cleaning actuating unit 22 by pipeline, oppositely cleans the pipeline of actuating unit 22 outlets through being provided with check-valves 23 and is connected with the permeate water outlet of membrane module 13 to be cleaned; The permeate water outlet of membrane module 13 to be cleaned is also led to explosive barrel 21 by one by the pipeline that is provided with Self controlling valve 24.
The chemically-cleaning device of aforesaid hollow fiber filter membrane wherein is provided with liquid automatic control device 25 in the explosive barrel 21.
The chemically-cleaning device of aforesaid hollow fiber filter membrane wherein oppositely cleans actuating unit 22 and is pump or air compressing mechanism.
The beneficial effect of hollow-fibre membrane chemical cleaning method of the present invention and device, the present invention has kept the forward cleaning method of prior art and the effect that cleaning device has, promptly, after starting forward scavenging pump 12, open Self controlling valve 16, when closing Self controlling valve 15, the Chemical cleaning soup is realized the flush clean on membrane module 13 filter membrane surfaces by check valve 14 and is opened Self controlling valve 16, when closing Self controlling valve 15, the Chemical cleaning soup enters in the membrane module 13 by check valve 14, realize to see through filter membrane and to the cleaning of film; When Self controlling valve 15 and 16 was all opened, the Chemical cleaning soup was realized the flush clean of part Chemical cleaning soup to membrane module 13 filter membrane surfaces by check valve 14, and part Chemical cleaning soup sees through filter membrane and to the cleaning of film; Close forward scavenging pump 12 and each Self controlling valve 15 and at 16 o'clock, the Chemical cleaning soup is rested in the membrane module 13, filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing the film surface.Increased the effect that the Chemical cleaning soup oppositely cleans by the filter membrane surface, when oppositely cleaning, close forward scavenging pump 12, open reverse cleaning actuating unit 22, close Self controlling valve 24, open Self controlling valve 16, make the Chemical cleaning soup enter seeing through in the mouth of a river of membrane module 13, see through face and get back to explosive barrel 11 through internally piloted valve 16, can not only be towards the trapped substance of demoulding surface alluvial, the trapped substance liquid that penetrates in the filter membrane wall internal pore is also had result of extraction preferably, improve cleaning performance greatly filter membrane.In addition, oppositely cleaning employed Chemical cleaning soup is to filter and enter in the explosive barrel 21 through membrane module 13, it is totally pollution-free all the time to guarantee that filter membrane filters side, avoided the dirt that gets off from the filter membrane surface clean that filter membrane is filtered the pollution of side, solved the problem that to use the backwash technology effectively because the misgivings membrane filtration crosses that side is polluted.
Description of drawings:
Fig. 1 is the chemically-cleaning device structural representation of existing hollow fiber filter membrane.
Fig. 2 is the chemical cleaning method and the apparatus structure schematic diagram of hollow fiber filter membrane of the present invention.
Major label description in figure: 11 explosive barrels, 12 forward scavenging pumps, 13 membrane module, 14 check valve, 15 Self controlling valves, 16 Self controlling valves, 21 explosive barrels, 22 backwashing pumps, 23 check valve, 24 Self controlling valves, 25 liquid automatic control devices to be cleaned.
The specific embodiment
Consult shown in Figure 2, the chemical cleaning method of hollow fiber filter membrane of the present invention, it is included in the chemically-cleaning device of hollow fiber filter membrane by cleaning soup forward cleaning process and reverse cleaning process is carried out in the filter membrane surface of membrane module.
The chemical cleaning method of hollow fiber filter membrane of the present invention, wherein, clean forward cleaning process that soup carries out the filter membrane surface of membrane module and oppositely cleaning process for hocketing continuously; The cleaning soup carries out the forward cleaning process to the filter membrane surface of membrane module and comprises step: (A) the Chemical cleaning soup for preparing is put into explosive barrel 11; (B) start forward scavenging pump 12; (C) open Self controlling valve 16, close Self controlling valve 15, allow the Chemical cleaning soup enter membrane module 13, get back to explosive barrel 11 and realize flush clean membrane module 13 filter membrane surfaces through internally piloted valve 16 by check valve 14; (D) close Self controlling valve 16, open Self controlling valve 15, allow the Chemical cleaning soup enter in the membrane module 13, get back to explosive barrel 11, realize to see through filter membrane and the cleaning of film through internally piloted valve 15 by check valve 14; (E) open Self controlling valve 15 and 16, allow the Chemical cleaning soup enter membrane module 13 by check valve 14, get back to explosive barrel 11 through internally piloted valve 15 and 16, realize the flush clean of part Chemical cleaning soup to membrane module 13 filter membrane surfaces, part Chemical cleaning soup sees through filter membrane and to the cleaning of film; (F) close forward scavenging pump 12 and Self controlling valve 15 and 16, the Chemical cleaning soup is rested in the membrane module 13, filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing the film surface; Described cleaning soup carries out reverse cleaning process to the filter membrane surface of membrane module and comprises step: (G) close Self controlling valve 15 and 16, open Self controlling valve 24, under the effect of forward scavenging pump 12, the Chemical cleaning soup enters in the membrane module 13, seeing through filter membrane then enters in the explosive barrel 21, when the Chemical cleaning soup in the explosive barrel 21 rises to the height liquid level of regulation, liquid automatic control device 25 work in the explosive barrel 21, forward scavenging pump 12 and Self controlling valve 24 are closed in control, open Self controlling valve 16 and reverse scavenging pump 22, make the cleaning chemistry of filtration clean soup through check valve 24 and enter in the filtration mouth of a river of membrane module 13, filter membrane is washed through film from the rightabout of membrane filtration, allow the Chemical cleaning soup after washing get back to explosive barrel 11; (H) when the Chemical cleaning soup in the explosive barrel 21 drops to the low liquid level of regulation, 25 work of liquid automatic control device are controlled reverse scavenging pump 22 and are closed, and finish reverse cleaning; (I) when oppositely cleaning is finished, open Self controlling valve 24, close Self controlling valve 16, forward scavenging pump 12 starts, and repeated forward is cleaned action, carries out next reciprocation cycle, until the scavenging period of setting; Oppositely clean the clean soup that the cleaning soup that uses is the process membrane filtration.
Consult shown in Figure 2ly, the chemically-cleaning device of hollow fiber filter membrane of the present invention is used for polluted hollow fiber film assembly is carried out Chemical cleaning; Comprise for explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 of placing the Chemical cleaning soup, this explosive barrel 11, forward scavenging pump 12, check-valves 14 and Self controlling valve 15 and 16 with membrane module 13 to be cleaned between be connected by pipeline; These explosive barrel 11 outlet conduits connect the water inlet of forward scavenging pump 12, and the outlet conduit of forward scavenging pump 12 connects membrane module 13 water inlets to be cleaned through check-valves 14; Explosive barrel 11 is got back to through the pipeline that is provided with Self controlling valve 16 in the membrane module 13 backflow mouths of a river; The pipeline of permeate water outlet through being provided with Self controlling valve 15 of membrane module 13 leads to explosive barrel 11; It is characterized in that: also comprise explosive barrel 21, oppositely clean actuating unit 22, check-valves 23 and Self controlling valve 24; This explosive barrel 21, oppositely clean between actuating unit 22, check-valves 23 and Self controlling valve 24 and the membrane module 13 to be cleaned and be connected by pipeline; The outlet of this explosive barrel 21 is connected with the import of oppositely cleaning actuating unit 22 by pipeline, oppositely cleans the pipeline of actuating unit 22 outlets through being provided with check-valves 23 and is connected with the permeate water outlet of membrane module 13 to be cleaned; The permeate water outlet of membrane module 13 to be cleaned is also led to explosive barrel 21 by one by the pipeline that is provided with Self controlling valve 24.
The chemically-cleaning device of hollow fiber filter membrane of the present invention wherein, is provided with liquid automatic control device 25 in the explosive barrel 21; Oppositely cleaning actuating unit 22 is pump or air compressing mechanism.
Consult shown in Figure 2, line among the figure between each parts is a fluid pipeline, membrane module 13 is a simplified structure, box indicating membrane module shell, lower end are water inlet, and the upper end is for seeing through the mouth of a river, the left side is the recirculation water outlet, oblique line in the square frame is represented filter membrane, and pleurodiaphragmatic in terspace water one side is represented in the lower left, and permeate water one side is represented in the upper right side.
The chemical cleaning method of hollow fiber filter membrane of the present invention and the enforcement of device during cleaning, are put into explosive barrel 11 with the Chemical cleaning soup for preparing earlier, start forward scavenging pump 12; Open Self controlling valve 16, when closing Self controlling valve 15 and Self controlling valve 24, the Chemical cleaning soup enters membrane module 13 water inlets by check valve 14, flows out from the membrane module refluxing opening, be circulated back to explosive barrel 11 through automatic valve 15, thereby realize flush clean the filter membrane surface; Open Self controlling valve 15, when closing Self controlling valve 16 and Self controlling valve 24, the Chemical cleaning soup enters membrane module 13 water inlets by check valve 14, sees through the film surface and gets back to explosive barrel 11 from seeing through the liquid mouth through Self controlling valve 15, realizes seeing through filter membrane and to the cleaning of film; When Self controlling valve 15 and 16 was all opened, when Self controlling valve 24 was closed, the Chemical cleaning soup was realized the flush clean of part Chemical cleaning soup to membrane module 13 filter membrane surfaces by check valve 14, and part Chemical cleaning soup sees through filter membrane and to the cleaning of film.Closing forward scavenging pump 12 and Self controlling valve 15,16 and at 24 o'clock, the Chemical cleaning soup is rested in the membrane module 13, filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing to the film surface.
The number needs that the medicine of the used Chemical cleaning of the present invention, concentration, liquid measure, scavenging period clean pollution situation, pollution level and the film of film according to desire will be determined.
More than membrane module is carried out the forward cleaning structure and the effect of Chemical cleaning for the prior art that keeps.Improvements of the present invention are to have increased reverse cleaning method and the equipment that membrane module is carried out Chemical cleaning, thereby has the effect that the Chemical cleaning soup is back and forth cleaned, it is on the basis of normal wash, can close Self controlling valve 15 and 16, open Self controlling valve 24, under the effect of forward scavenging pump 12, the Chemical cleaning soup of cleaning is entered in the membrane module 13, seeing through filter membrane then enters in the explosive barrel 21, when the Chemical cleaning soup in the explosive barrel 21 rises to the height liquid level of regulation, liquid automatic control device 25 work in the explosive barrel 21, control forward scavenging pump 12 and Self controlling valve 24 are closed, Self controlling valve 15 is opened, open reverse scavenging pump 22, the cleaning chemistry cleaning soup of filtration is entered in the membrane module 13 from membrane component filtered solution mouth through check valve 23, and filter membrane is washed from the rightabout of membrane filtration, allow Chemical cleaning soup after the flushing from the membrane module refluxing opening in Self controlling valve 16 is got back to explosive barrel 11, wash in the dirt inflow explosive barrel 11 on film surface; When the Chemical cleaning soup in the explosive barrel 21 drops to the low liquid level of regulation, 25 work of liquid automatic control device, controlling reverse scavenging pump 22 closes, finish a reciprocal clean cycle, open Self controlling valve 24 simultaneously, close Self controlling valve 15, forward scavenging pump 12 starts, action is back and forth cleaned in beginning next time, repeats back and forth until the reciprocal scavenging period of setting.Allow the Chemical cleaning soup carry out two-way flushing by filter membrane back and forth during this time, oppositely clean the cleaning soup that used soup all is the process membrane filtration, guaranteed that film sees through the cleaning of side, improves the Chemical cleaning effect of filter membrane, effectively the service life of membrane component and prolong greatly.
The chemical cleaning method of of the present invention hollow fiber filter membrane and device thereof are that continuous alternating carries out to the forward cleaning step and the reverse cleaning step of filter membrane.
The Self controlling valve, check valve, liquid automatic control device, pump and the Chemical cleaning soup that relate among the chemical cleaning method of of the present invention hollow fiber filter membrane and the device embodiment thereof are the commercially available prod, its operation principle and using method are prior art, other unaccounted contents are prior art also, so no longer give unnecessary details.
Hollow fiber filter membrane is when operation, and under the pressure effect of pump, the surface of film can progressively deposit and form pollutant and gel layer, and general forward cleans, and can only work to wash away the long and effect portion ideal of scavenging period to pollutant and gel layer; Oppositely clean, be from film see through side pressurization, allow and clean the soup direction by face, pollutant and gel layer are produced peel off effect, so effect is better than forward and cleans.The present invention introduces the Chemical cleaning process with backwash process, solved prior art to the Chemical cleaning of hollow-fibre membrane because can not to solve filter membrane filtered solution one side contaminated and can't realize the problem of backwash making Chemical cleaning more effective.Have, this body structure of hollow-fibre membrane has the performance that can tolerate buffer brake again, can use this effective cleaning means of reverse cleaning, and this also is one of hollow-fibre membrane main feature of being better than other form filter membranes.
Use the chemically-cleaning device of the utility model hollow fiber filter membrane that the old filter membrane through using the serious decline of flux to change was for many years carried out washing test, though this old film is through Chemical cleaning repeatedly, water flux is still less than 40% of initial flux, can not satisfy production requirement and change, use chemical cleaning method of the present invention and device to carry out cleaning experiment, the result shows, the cleaning of implementing the cleaning device of this cleaning method is highly effective, through Chemical cleaning repeatedly the old filter membrane of efficient recovery flux can not be arranged still, after using this chemically-cleaning device to clean, flux returns to 75 to 80% of initial flux, reaches the effect that can continue to use fully.Can effectively improve the service life of hollow-fibre membrane like this, reduce the operating cost of film system greatly, economize on resources, meet strategy of sustainable development needs.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any form restriction, every foundation technical spirit of the present invention is to any simple modification, equivalent variations and modification that above embodiment did, all still belongs in the scope of technical scheme of the chemical cleaning method of this hollow fiber filter membrane of the present invention and device.
Claims (7)
1, a kind of chemical cleaning method of hollow fiber filter membrane is characterized in that, it is included in the chemically-cleaning device of hollow fiber filter membrane by cleaning soup forward cleaning process and reverse cleaning process are carried out in the filter membrane surface of membrane module.
2, the chemical cleaning method of hollow fiber filter membrane according to claim 1 is characterized in that, the forward cleaning process that described cleaning soup carries out the filter membrane surface of membrane module and oppositely cleaning process for hocketing continuously.
3, the chemical cleaning method of hollow fiber filter membrane according to claim 1 is characterized in that, described cleaning soup carries out the forward cleaning process to the filter membrane surface of membrane module and comprises step: (A) the Chemical cleaning soup for preparing is put into explosive barrel (11); (B) start forward scavenging pump (12); (C) open Self controlling valve (16), close Self controlling valve (15), allow the Chemical cleaning soup enter membrane module (13), get back to explosive barrel (11) and realize flush clean membrane module (13) filter membrane surface through internally piloted valve (16) by check valve (14); (D) close Self controlling valve (16), open Self controlling valve (15), allow the Chemical cleaning soup enter in the membrane module (13), get back to explosive barrel (11), realize to see through filter membrane and the cleaning of film through internally piloted valve (15) by check valve (14); (E) open Self controlling valve (15) and (16), allow the Chemical cleaning soup enter membrane module (13) by check valve (14), get back to explosive barrel (11) through internally piloted valve (15) and (16), realize the flush clean of part Chemical cleaning soup to membrane module (13) filter membrane surface, part Chemical cleaning soup sees through filter membrane and to the cleaning of film; (F) close forward scavenging pump (12) and Self controlling valve (15) and (16), the Chemical cleaning soup is rested in the membrane module (13), filter membrane is soaked, allow Chemical cleaning soup and trapped substance have the sufficient time to react, realize soaking and washing the film surface; Described cleaning soup carries out reverse cleaning process to the filter membrane surface of membrane module and comprises step: (G) close Self controlling valve (15) and (16), open Self controlling valve (24), under the effect of forward scavenging pump (12), the Chemical cleaning soup enters in the membrane module (13), seeing through filter membrane then enters in the explosive barrel (21), when the Chemical cleaning soup in the explosive barrel (21) rises to the height liquid level of regulation, liquid automatic control device (25) work in the explosive barrel (21), forward scavenging pump (12) and Self controlling valve (24) are closed in control, open Self controlling valve (16) and reverse scavenging pump (22), make the cleaning chemistry of filtration clean soup through check valve (24) and enter in the filtration mouth of a river of membrane module (13), filter membrane is washed through film from the rightabout of membrane filtration, allow the Chemical cleaning soup after washing get back to explosive barrel (11); (H) when the Chemical cleaning soup in the explosive barrel (21) drops to the low liquid level of regulation, liquid automatic control device (25) work is controlled reverse scavenging pump (22) and is closed, and finishes reverse cleaning; (I) when oppositely cleaning is finished, open Self controlling valve (24), close Self controlling valve (16), forward scavenging pump (12) starts, and repeated forward is cleaned action, carries out next reciprocation cycle, until the scavenging period of setting.
According to the chemical cleaning method of claim 1,2 or 3 described hollow fiber filter membrane, it is characterized in that 4, the cleaning soup that described reverse cleaning is used is the clean soup through membrane filtration.
5, a kind of chemically-cleaning device of hollow fiber filter membrane, comprise for explosive barrel (11), forward scavenging pump (12), check-valves (14) and Self controlling valve (15) and (16) of placing the Chemical cleaning soup, be connected by pipeline between this explosive barrel (11), forward scavenging pump (12), check-valves (14) and Self controlling valve (15) and (16) and the membrane module (13) to be cleaned; This explosive barrel (11) outlet conduit connects the water inlet of forward scavenging pump (12), and the outlet conduit of forward scavenging pump (12) connects membrane module (13) water inlet to be cleaned through check-valves (14); Explosive barrel (11) is got back to through the pipeline that is provided with Self controlling valve (16) in membrane module (13) the backflow mouth of a river; The pipeline of permeate water outlet through being provided with Self controlling valve (15) of membrane module (13) leads to explosive barrel (11); It is characterized in that: also comprise explosive barrel (21), oppositely clean actuating unit (22), check-valves (23) and Self controlling valve (24); This explosive barrel (21), oppositely clean between actuating unit (22), check-valves (23) and Self controlling valve (24) and the membrane module (13) to be cleaned and be connected by pipeline; The outlet of this explosive barrel (21) is connected with the import of oppositely cleaning actuating unit (22) by pipeline, oppositely cleans the pipeline of actuating unit (22) outlet through being provided with check-valves (23) and is connected with the permeate water outlet of membrane module to be cleaned (13); The permeate water outlet of membrane module to be cleaned (13) is also led to explosive barrel (21) by one by the pipeline that is provided with Self controlling valve (24).
6, the chemically-cleaning device of hollow fiber filter membrane according to claim 5 is characterized in that, is provided with liquid automatic control device (25) in the described explosive barrel (21).
7, the chemically-cleaning device of hollow fiber filter membrane according to claim 5 is characterized in that, described reverse cleaning actuating unit (22) is pump or air compressing mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810147164A CN101653701A (en) | 2008-08-22 | 2008-08-22 | Method and device for chemically cleaning hollow fiber filtration membrane |
Applications Claiming Priority (1)
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102327740A (en) * | 2011-07-14 | 2012-01-25 | 太仓市金鹿电镀有限公司 | Method for cleaning organic matter on ultrafiltration membrane |
| CN102371123A (en) * | 2010-08-24 | 2012-03-14 | 苏州立升净水科技有限公司 | On-line cleaning method of immersed hollow fiber membrane module |
| CN102380317A (en) * | 2011-09-16 | 2012-03-21 | 天津市华宇膜技术有限公司 | Method for raising effect of chemically cleaning ultrafiltration membrane |
| CN102512966A (en) * | 2011-12-02 | 2012-06-27 | 杭州求是膜技术有限公司 | Reverse osmosis membrane pollution prevention and control method |
| CN103084070A (en) * | 2013-02-22 | 2013-05-08 | 浙江开创环保科技有限公司 | Method for preventing whole-house separate purifying device film from being polluted |
| CN103977710A (en) * | 2014-03-20 | 2014-08-13 | 河海大学 | Chemical cleaning method for inner-pressure-type membrane system |
| CN110132046A (en) * | 2018-02-09 | 2019-08-16 | 三菱日立电力系统株式会社 | Chemically-cleaning device and the chemical cleaning method for having used the chemically-cleaning device |
| CN110180396A (en) * | 2019-05-31 | 2019-08-30 | 中广核核电运营有限公司 | Cleaning equipment for membrane separation device |
| CN111847689A (en) * | 2020-07-23 | 2020-10-30 | 上海乔尼水处理设备工程有限公司 | Livestock drinking water system adopting ultrafiltration technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371123A (en) * | 2010-08-24 | 2012-03-14 | 苏州立升净水科技有限公司 | On-line cleaning method of immersed hollow fiber membrane module |
| CN102327740A (en) * | 2011-07-14 | 2012-01-25 | 太仓市金鹿电镀有限公司 | Method for cleaning organic matter on ultrafiltration membrane |
| CN102327740B (en) * | 2011-07-14 | 2013-07-10 | 太仓市金鹿电镀有限公司 | Method for cleaning organic matter on ultrafiltration membrane |
| CN102380317A (en) * | 2011-09-16 | 2012-03-21 | 天津市华宇膜技术有限公司 | Method for raising effect of chemically cleaning ultrafiltration membrane |
| CN102512966A (en) * | 2011-12-02 | 2012-06-27 | 杭州求是膜技术有限公司 | Reverse osmosis membrane pollution prevention and control method |
| CN103084070A (en) * | 2013-02-22 | 2013-05-08 | 浙江开创环保科技有限公司 | Method for preventing whole-house separate purifying device film from being polluted |
| CN103977710A (en) * | 2014-03-20 | 2014-08-13 | 河海大学 | Chemical cleaning method for inner-pressure-type membrane system |
| CN103977710B (en) * | 2014-03-20 | 2016-09-28 | 河海大学 | A kind of inner pressed membranous system chemical cleaning method |
| CN110132046A (en) * | 2018-02-09 | 2019-08-16 | 三菱日立电力系统株式会社 | Chemically-cleaning device and the chemical cleaning method for having used the chemically-cleaning device |
| CN110180396A (en) * | 2019-05-31 | 2019-08-30 | 中广核核电运营有限公司 | Cleaning equipment for membrane separation device |
| CN110180396B (en) * | 2019-05-31 | 2021-12-07 | 中广核核电运营有限公司 | Cleaning equipment for membrane separation device |
| CN111847689A (en) * | 2020-07-23 | 2020-10-30 | 上海乔尼水处理设备工程有限公司 | Livestock drinking water system adopting ultrafiltration technology |
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