CN104941454A - Ultrafiltration (UF) membrane operation method - Google Patents
Ultrafiltration (UF) membrane operation method Download PDFInfo
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- CN104941454A CN104941454A CN201410115060.8A CN201410115060A CN104941454A CN 104941454 A CN104941454 A CN 104941454A CN 201410115060 A CN201410115060 A CN 201410115060A CN 104941454 A CN104941454 A CN 104941454A
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Abstract
The invention belongs to the technical field of membranes and relates to an ultrafiltration (UF) membrane operation method. The specific method comprises the following steps of: filtering raw water by an interruption UF membrane; carrying out physical washing on the UF membrane; and after the physical washing is finished, filtering the raw water, wherein the physical washing comprises an air brushing step, and the flow Qi of air brushing is adjusted according to an UF membrane osmotic coefficient, filtering pressure difference or filtering resistance before air brushing. According to the UF membrane operation method, a mode of fixing the flow of air brushing, which is adopted in an existing UF membrane operation process, is changed, and the risk of breaking a hollow wire membrane, caused by the fact that the flow of air brushing is too great, is avoided; and the operation cost of the UF membrane is reduced. The flow of air brushing is adjusted according to an operation manner provided by the invention, and pollution substances on the surface of the membrane are relatively easy to wash off, so that the UF membrane can be stably operated and the chemical washing period is prolonged.
Description
Technical field
The invention belongs to technical field of membrane, be specifically related to a kind of operation method of milipore filter.
Background technology
Membrane technology is widely used as a kind of novel isolation technics and shows vast potential for future development in water treatment.The technology such as ultrafiltration (UF), micro-filtration (MF) are the technology often used in water treatment, it is simple to operate, automaticity is high, and be widely used in waste water recycling process and water treatment, one of its topmost application form is hollow-fibre membrane.Membrane pollution problem is the bottleneck problem of restriction film application all the time.Pollution of Ultrafiltration Membrane refers to the absorption in film surface or fenestra of the materials such as particulate in treat liquid, colloidal particle, organic matter and microorganism, precipitation, causes the phenomenon that the permeable amount of film declines.Milipore filter generally recovers the strainability of film by regular physical cleaning and Chemical cleaning.
The running of ultrafiltration/micro-filtration, generally comprise filtration, the step such as backwash, air wash away, just rinsing, wherein air washes away is physical cleaning means the most frequently used during ultrafiltration/micro-filtration runs, bubble is imported in UF/MF membrane module, film silk is vibrated, thus wipes the attachment material on film surface.The air mass flow that air washes away is generally by film producer limited range, be in operation and use fixing air to wash away flow, if it is bigger than normal that air washes away flow set, at the initial operating stage of milipore filter, when film silk surface is very clean, the risk of easy generation hollow fiber film thread fracture, the large flow that washes away also means higher operating cost simultaneously.If it is less than normal that air washes away flow set, the polluter on film surface is not easy to be rinsed, and film is easy to pollute, and the strainability of film declines, need frequently Chemical cleaning to recover the strainability of film.Therefore, in UF/MF runs, use fixing air to wash away flow to there is a lot of drawbacks, the advantage of UF/MF can not be given full play to.Patent (CN102397752B) refer to the cleaning method of milipore filter, comprise physical cleaning method and chemical cleaning method, wherein physical cleaning method comprises and carries out gas to hyperfiltration membrane assembly and clean process and hyperfiltration membrane assembly backwash process, gas process of cleaning is that hyperfiltration membrane assembly passes into compressed air while the dense water of discharge, the gas scouring air pressure that its gas cleans process is preferably 1.5bar, air inlet stops 15 seconds in 8 seconds, air inlet stops 15 seconds in 8 seconds again, circulate 10 times, so fixing gas cleans air pressure can not obtain good scouring effect when Pollution of Ultrafiltration Membrane is more serious.
Develop a kind of new UF operation method, the fracture of wire phenomenon of hollow-fibre membrane can either be avoided, can ensure that again the long-term stability of film is run, extend the Chemical cleaning cycle, easy to operate, with low cost, the popularization adopting embrane method to carry out water treatment technology is had great importance.
Summary of the invention
The present inventor studies and finds that adopting fixing air to wash away flow during milipore filter runs carries out physical cleaning, when the changeless larger air of employing washes away the risk that flow exists fracture of wire, also need higher operating cost simultaneously.And under changeless less air washes away flow condition, milipore filter is easy to pollute, need to carry out Chemical cleaning frequently, Chemical cleaning not only can reduce the product water efficiency of milipore filter frequently, and the frequent use of chemical agent simultaneously too increases the operating cost of milipore filter.
The technical problem to be solved in the present invention is:
Problems existing in running for current milipore filter, develops a kind of new milipore filter operation method, can either avoid the fracture of wire phenomenon of hollow-fibre membrane, can ensure that again the long-term stability of film is run.
Object of the present invention can be reached by following measures:
A kind of milipore filter operation method, includes and interrupts milipore filter to the filtration step of former water, implement physical cleaning step to milipore filter, and physical cleaning terminate after again filtration step is carried out to former water; Wherein physical cleaning comprises air and washes away step, and the described air air washed away in step washes away flow Q
imilipore filter infiltration coefficient, filtration pressure difference or filtration resistance before washing away according to air adjust.
Air washes away flow Q
imilipore filter infiltration coefficient, filtration pressure difference or filtration resistance before washing away according to air adjust, change during existing milipore filter runs the pattern of fixedly washing away flow, can avoid because of air that to wash away flow set bigger than normal, at the initial operating stage of milipore filter, when film silk surface is very clean, there is the risk of hollow fiber film thread fracture.Reduce simultaneously larger air wash away flow condition under operating cost.Wash away flow adjustment according to mode of operation of the present invention to air, the polluter on film surface is more easily rinsed, and ensures the normal operation of UF film, extends the cycle of Chemical cleaning.
When the air in physical cleaning wash away flow wash away according to air before milipore filter infiltration coefficient adjust time, its air washes away flow Q
iscope be shown below:
b[(Q
max-Q
0)*(a
0-a
i)/(a
0-a
min)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(a
0-a
i)/(a
0-a
min)+Q
0]，
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; a
ifor the infiltration coefficient in running; a
0for the infiltration coefficient of milipore filter initial operating stage; a
minfor the infiltration coefficient of end-of-run, b and c is that air washes away flow regulation coefficient, and b is preferably 0.8-0.9, and c is preferably 1.1-1.2.Work as Q
ibe less than 0.8* [(Q
max-Q
0) * (a
0-a
i)/(a
0-a
min)+Q
0] time, air washes away flow may be not enough, and the polluter of ultrafiltration membrane surface can not effectively be rinsed.And work as Q
ibe greater than 1.2* [(Q
max-Q
0) * (a
0-a
i)/(a
0-a
min)+Q
0] time, air washes away flow may exist excessive risk, can cause the appearance of hollow-fibre membrane fracture of wire phenomenon.
Infiltration coefficient is the Common Parameters of characterization of membrane strainability in milipore filter running, and when milipore filter occurs to pollute, infiltration coefficient declines.Within a Chemical cleaning cycle of UF, infiltration coefficient reduces gradually, air in physical cleaning is washed away flow to adjust according to the infiltration coefficient before air washes away, air can be washed away flow-control a more rational level, enable air wash away flow to supply as required, the polluter of ultrafiltration membrane surface is more easily rinsed, ensure that the stable operation of milipore filter, turn avoid simultaneously and the risk that excessive air washes away the hollow-fibre membrane fracture of wire that flow causes is set, reduce operating cost.
When the air in physical cleaning wash away flow according to implement air wash away before ultrafiltration membrance filter pressure reduction adjust time, its air washes away flow Q
iscope be shown below:
b[(Q
max-Q
0)*(p
i-p
0)/(p
max-p
0)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(p
i-p
0)/(p
max-p
0)+Q
0],
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; p
ifor the filtration pressure difference in running; p
0for the filtration pressure difference of milipore filter initial operating stage; p
maxfor the filtration pressure difference of end-of-run, b and c is that air washes away flow regulation coefficient, and b is preferably 0.8-0.9, and c is preferably 1.1-1.2.Work as Q
ibe less than 0.8* [(Q
max-Q
0) * (p
i-p
0)/(p
max-p
0)+Q
0] time, air washes away flow may be not enough, and the polluter of ultrafiltration membrane surface can not effectively be rinsed.And work as Q
ibe greater than 1.2* [(Q
max-Q
0) * (p
i-p
0)/(p
max-p
0)+Q
0] time, air washes away flow may exist excessive risk, can cause the appearance of hollow-fibre membrane fracture of wire phenomenon.
Filtration pressure difference is the Common Parameters of characterization of membrane strainability in milipore filter running, and when milipore filter occurs to pollute, filtration pressure difference rises.Within a Chemical cleaning cycle of UF, filtration pressure difference rises gradually, air in physical cleaning is washed away flow to adjust according to the filtration pressure difference before air washes away, air can be washed away flow-control a more rational level, enable air wash away flow to supply as required, the polluter of ultrafiltration membrane surface is more easily rinsed, ensure that the stable operation of milipore filter, turn avoid simultaneously and the risk that excessive air washes away the hollow-fibre membrane fracture of wire that flow causes is set, reduce operating cost.
When the air in physical cleaning wash away flow according to implement air wash away before ultrafiltration membrance filter resistance adjust time, its air washes away flow Q
iscope be shown below:
b[(Q
max-Q
0)*(r
i-r
0)/(r
max-r
0)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(r
i-r
0)/(r
max-r
0)+Q
0]，
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; r
ifor the filtration resistance in running; r
0for the filtration resistance of milipore filter initial operating stage; r
maxfor the filtration resistance of end-of-run, b and c is that air washes away flow regulation coefficient, and b is preferably 0.8-0.9, and c is preferably 1.1-1.2.Work as Q
ibe less than 0.8* [(Q
max-Q
0) * (r
i-r
0)/(r
max-r
0)+Q
0] time, air washes away flow may be not enough, and the polluter of ultrafiltration membrane surface can not effectively be rinsed.And work as Q
ibe greater than 1.2* [(Q
max-Q
0) * (r
i-r
0)/(r
max-r
0)+Q
0] time, air washes away flow may exist excessive risk, can cause the appearance of hollow fiber membrane fracture of wire phenomenon.
Filtration resistance is the Common Parameters of characterization of membrane strainability in milipore filter running, and when milipore filter occurs to pollute, filtration resistance rises.Within a Chemical cleaning cycle of UF, filtration resistance rises gradually, the flow washed away by air in physical cleaning adjusts according to the filtration resistance before air washes away, air can be washed away flow-control a more rational level, enable air wash away flow to supply as required, the polluter of ultrafiltration membrane surface is more easily rinsed, ensure that the stable operation of milipore filter, turn avoid simultaneously and the risk that excessive air washes away the hollow-fibre membrane fracture of wire that flow causes is set, reduce operating cost.
To the former water of ultrafiltration membrane treatment, there is no particular limitation in the present invention, and when former water is the after-treatment water of municipal sewage plant, turbidity is 2-30NTU, and the advantage of this operation method is more obvious.The after-treatment water variation water quality of municipal sewage plant is larger, compared to surface water such as rivers, more easily pollute during the after-treatment water of ultrafiltration membrane treatment sewage treatment plant, under the condition of the physical cleaning of routine, the polluter of ultrafiltration membrane surface is more difficult to be washed down, and under variable air of the present invention washes away flow condition, during the after-treatment water of UF film Treating Municipal Sewage treatment plant, the operation of milipore filter can be made more stable, extend the time of Chemical cleaning.
The steps such as the physical cleaning of milipore filter generally comprises backwash, air washes away and/or just rinsing, can carry out backwash and air flush clean simultaneously; Or separately backwash is carried out to milipore filter, backwash terminates rear to milipore filter enforcement air flush clean, or milipore filter is just being rinsed and air flush clean simultaneously, or separately milipore filter is just being rinsed, just rinsing and terminating to implement air flush clean to milipore filter afterwards.Air flush clean and backwash are operating procedures the most frequently used in hollow fiber ultrafiltration membrane running, and this step is simple to operate, the polluter on film surface can be washed away.Wherein physical cleaning preferably carries out air to milipore filter simultaneously and washes away and backwash, and the time is 30-120s.Carry out air to milipore filter to wash away and backwash 30-120s, the polluter on film surface may more easily be washed down simultaneously, slow down the pollution speed of milipore filter, makes the operation of ultrafiltration more stable.
The present invention changes in existing milipore filter running and adopts fixed air to wash away the pattern of flow, and milipore filter infiltration coefficient, filtration pressure difference or filtration resistance before washing away according to air wash away flow adjustment to air.Avoid the risk that air washes away the excessive hollow-fibre membrane fracture of wire caused of flow, reduce the operating cost of milipore filter.Wash away flow adjustment according to mode of operation of the present invention to air, the polluter on film surface is more easily rinsed, and ensures the stable operation of UF film, extends the cycle of Chemical cleaning.
Detailed description of the invention
In embodiment, the mensuration of turbidity adopts the turbidimetry (model 2100AN) of Hash company of the U.S..Water quality data is wherein the mean value (test in every two weeks 1 time, bimestrial mean value) obtained in test.Air washes away flow and automatically controls adjustment by PLC control system.
Embodiment 1
This test ultrafiltration membrane treatment water yield 50m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 2-10NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implement physical cleaning to milipore filter, filter after physical cleaning terminates to former water again, the step of its physical cleaning is implement backwash and air flush clean to milipore filter simultaneously, the backwash time is 90s, and its air washes away flow Q
imilipore filter infiltration coefficient before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.6m
3/ h, minimum air washes away flow Q
0for 2.1m
3/ h, the infiltration coefficient a of milipore filter initial operating stage
0for 3.75*10
-2m/dKPa, the infiltration coefficient a of end-of-run
minfor 8.33*10
-3m/dKPa, a certain infiltration coefficient a in running
ifor 1.88*10
-2m/dKPa, the air of its correspondence washes away flow Q
ifor:
0.85 [(3.75*10
-2-1.88*10
-2) * (3.6-2.1)/(3.75*10
-2-8.33*10
-3)+2.1]≤Q
i≤ 1.1 [(3.75*10-2-1.88*10-2) * (3.6-2.1)/(3.75*10-2-8.33*10-3)+2.1], i.e. 2.60m
3/ h≤Q
i≤ 3.37m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 3 months.
Embodiment 2
This test ultrafiltration membrane treatment water yield 100m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implements physical cleaning, filter after physical cleaning terminates to former water again milipore filter, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the backwash time is 60s, the flow Q that its air washes away
iultrafiltration membrance filter pressure reduction before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 7.2m
3/ h, minimum air washes away flow Q
0for 4.2m
3/ h, the filtration pressure difference p of milipore filter initial operating stage
0for 40KPa, the filtration pressure difference p of end-of-run
maxfor 180KPa, a certain filtration pressure difference p in running
ifor 100KPa, the air of its correspondence washes away flow Q
ifor:
0.8[(100-40)*(7.2-4.2)/(180-40)+4.2]≤Q
i
≤ 1.2 [(100-40) * (7.2-4.2)/(180-40)+4.2], i.e. 4.38m
3/ h≤Q
i≤ 6.58m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 2.5 months.
Embodiment 3
This test ultrafiltration membrane treatment water yield 48m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implements physical cleaning, filter after physical cleaning terminates to former water again milipore filter, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the backwash time is 60s, the flow Q that its air washes away
iultrafiltration membrance filter resistance before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.5m
3/ h, minimum air washes away flow Q
0for 2.0m
3/ h, the filtration resistance r of milipore filter initial operating stage
0for 1.72*10
12m
-1, a certain filtration resistance r of end-of-run
maxfor 7.78*10
12m
-1, the filtration resistance r in running
ifor 5.60*10
12m
-1, the air of its correspondence washes away flow Q
ifor:
0.9 [(5.60*10
12-1.72*10
12) * (3.5-2.0)/(7.78*10
12-1.72*10
12)+2.0]≤Q
i≤ 1.05 [(5.60*10
12-1.72*10
12) * (3.5-2.0)/(7.78*10
12-1.72*10
12)+2.0], i.e. 2.66m
3/ h≤Q
i≤ 3.11m
3/ h
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 2.5 months.
Embodiment 4
This test ultrafiltration membrane treatment water yield 50m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 2-10NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, physical cleaning is implemented to milipore filter, filter former water after physical cleaning terminates, the step of its physical cleaning is implement backwash and air flush clean to milipore filter, the flow Q that its air washes away simultaneously again
imilipore filter infiltration coefficient before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.6m
3/ h, minimum air washes away flow Q
0for 2.1m
3/ h, the infiltration coefficient a of milipore filter initial operating stage
0for 3.75*10
-2m/dKPa, the infiltration coefficient a of end-of-run
minfor 8.33*10
-3m/dKPa, a certain infiltration coefficient ai in running is 1.88*10
-2m/dKPa, the air of its correspondence washes away flow Q
ifor: 0.8*2.1<Qi<0.8 [(3.75*10
-2-1.88*10
-2) * (3.6-2.1)/(3.75*10
-2-8.33*10
-3)+2.1], i.e. 1.68m
3/ h<Qi<2.45m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 1.5 months.
Embodiment 5
This test ultrafiltration membrane treatment water yield 50m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 2-10NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, physical cleaning is implemented to milipore filter, filter former water after physical cleaning terminates, the step of its physical cleaning is implement backwash and air flush clean to milipore filter, the flow Q that its air washes away simultaneously again
imilipore filter infiltration coefficient before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.6m
3/ h, minimum air washes away flow Q
0for 2.1m
3/ h, the infiltration coefficient a of milipore filter initial operating stage
0for 3.75*10
-2m/dKPa, the infiltration coefficient a of end-of-run
minfor 8.33*10
-3m/dKPa, a certain infiltration coefficient a in running
ifor 1.88*10
-2m/dKPa, the air of its correspondence washes away flow Q
ifor: 1.2*3.6>Qi>1.3 [(3.75*10
-2-1.88*10
-2) * (3.6-2.1)/(3.75*10
-2-8.33*10
-3)+2.1], i.e. 4.32m
3/ h>Qi>3.98m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 3 months, but has found that fracture of wire phenomenon appears in UF film by delivery turbidity change, and UF delivery turbidity uprises, and rises to 0.19NTU by the 0.05NTU at initial stage.
Embodiment 6
This test ultrafiltration membrane treatment water yield 100m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implement physical cleaning to milipore filter, filter after physical cleaning terminates to former water again, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the flow Q that its air washes away
iultrafiltration membrance filter pressure reduction before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 7.2m
3/ h, minimum air washes away flow Q
0for 4.2m
3/ h, the filtration pressure difference p of milipore filter initial operating stage
0for 40KPa, the filtration pressure difference p of end-of-run
maxfor 180KPa, a certain filtration pressure difference p in running
ifor 100KPa, the air of its correspondence washes away flow Q
ifor:
0.8*4.2<Qi<0.75 [(100-40) * (7.2-4.2)/(180-40)+4.2], namely
3.36m
3/h<Qi<4.11m
3/h。
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 1.5 months.
Embodiment 7
This test ultrafiltration membrane treatment water yield 100m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implement physical cleaning to milipore filter, filter after physical cleaning terminates to former water again, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the flow Q that its air washes away
iultrafiltration membrance filter pressure reduction before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 7.2m
3/ h, minimum air washes away flow Q
0for 4.2m
3/ h, the filtration pressure difference p of milipore filter initial operating stage
0for 40KPa, the filtration pressure difference p of end-of-run
maxfor 180KPa, a certain filtration pressure difference p in running
ifor 100KPa, the air of its correspondence washes away flow Q
ifor:
1.2*7.2>Qi>1.4 [(100-40) * (7.2-4.2)/(180-40)+4.2], namely
8.64m
3/h>Qi>7.67m
3/h。
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 2.5 months, but has found that fracture of wire phenomenon appears in UF film by delivery turbidity change, and UF delivery turbidity uprises, and is increased to 0.21NTU by the 0.06NTU at initial stage.
Embodiment 8
This test ultrafiltration membrane treatment water yield 48m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implements physical cleaning, filter after physical cleaning terminates to former water again milipore filter, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the backwash time is 60s, the flow Q that its air washes away
iultrafiltration membrance filter resistance before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.5m
3/ h, minimum air washes away flow Q
0for 2.0m
3/ h, the filtration resistance r of milipore filter initial operating stage
0for 1.72*10
12m
-1, a certain filtration resistance r of end-of-run
maxfor 7.78*10
12m
-1, the filtration resistance r in running
ifor 5.60*10
12m
-1, the air of its correspondence washes away flow Q
ifor:
0.8*2.0<Q
i<0.7 [(5.60*10
12-1.72*10
12) * (3.5-2.0)/(7.78*10
12-1.72*10
12)+2.0], i.e. 1.6m
3/ h<Q
i<2.07m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 1.5 months.
Embodiment 9
This test ultrafiltration membrane treatment water yield 48m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 30-40NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implements physical cleaning, filter after physical cleaning terminates to former water again milipore filter, the step of its physical cleaning is first implement backwash to milipore filter, backwash terminate rear to milipore filter implement air wash away, the backwash time is 60s, the flow Q that its air washes away
iultrafiltration membrance filter resistance before washing away according to air adjusts, and wherein maximum air washes away flow Q
maxfor 3.5m
3/ h, minimum air washes away flow Q
0for 2.0m
3/ h, the filtration resistance r of milipore filter initial operating stage
0for 1.72*10
12m
-1, a certain filtration resistance r of end-of-run
maxfor 7.78*10
12m
-1, the filtration resistance r in running
ifor 5.60*10
12m
-1, the air of its correspondence washes away flow Q
ifor:
1.2*3.5>Q
i>1.3 [(5.60*10
12-1.72*10
12) * (3.5-2.0)/(7.78*10
12-1.72*10
12)+2.0], i.e. 4.2m
3/ h>Q
i>3.85m
3/ h.
This UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 2.5 months, but has found that fracture of wire phenomenon appears in UF film by delivery turbidity change, and UF delivery turbidity uprises, and rises to 0.18NTU by the 0.05NTU at initial stage.
Comparative example 1
Contrast test ultrafiltration membrane treatment water yield 50m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 2-10NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implement physical cleaning to milipore filter, filter after physical cleaning terminates to former water again, the step of its physical cleaning is implement backwash and air flush clean to milipore filter simultaneously, the backwash time is 90s, and the flow that its air washes away is fixed as 2.2m
3/ h, this UF film operating flux is 1.2m/d, and the Chemical cleaning cycle is 1 month.
Comparative example 2
Contrast test ultrafiltration membrane treatment water yield 50m
3/ d, process the after-treatment water that former water is certain municipal sewage plant, turbidity is 2-10NTU, the operation method of its milipore filter is interrupt milipore filter to the filtration of former water, implement physical cleaning to milipore filter, filter after physical cleaning terminates to former water again, the step of its physical cleaning is implement backwash and air flush clean to milipore filter simultaneously, the backwash time is 90s, and the flow that its air washes away is fixed as 3.6m
3/ h, this UF film operating flux is 1.5m/d, and the Chemical cleaning cycle is 2.5 months, but has found that fracture of wire phenomenon appears in UF film by delivery turbidity change, and UF delivery turbidity uprises, and rises to 0.20NTU by the 0.06NTU at initial stage.
Embodiment and comparative example are compared and can find out, the air in milipore filter running wash away flow wash away according to air before milipore filter infiltration coefficient, filtration pressure difference or filtration resistance adjust.Ensure that the stable operation of UF film, reduce the risk of hollow-fibre membrane fracture of wire, extend the cycle of Chemical cleaning.
Claims (6)
1. a milipore filter operation method, includes and interrupts milipore filter to the filtration step of former water, again to former water carries out filtration step after terminating to milipore filter enforcement physical cleaning step and physical cleaning; It is characterized in that: wherein physical cleaning comprises air and washes away step, and the described air air washed away in step washes away flow Q
imilipore filter infiltration coefficient, filtration pressure difference or filtration resistance before washing away according to air adjust.
2. milipore filter operation method according to claim 1, is characterized in that: the air in described physical cleaning wash away flow wash away according to air before milipore filter infiltration coefficient when adjusting, its air washes away flow Q
iscope be shown below:
b[(Q
max-Q
0)*(a
0-a
i)/(a
0-a
min)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(a
0-a
i)/(a
0-a
min)+Q
0]，
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; a
ifor the infiltration coefficient in running; a
0for the infiltration coefficient of milipore filter initial operating stage; a
minfor the infiltration coefficient of end-of-run, b and c is that air washes away flow regulation coefficient, and b is 0.8-0.9, c is 1.1-1.2.
3. milipore filter operation method according to claim 1, is characterized in that: the air in described physical cleaning wash away flow according to implement air wash away before ultrafiltration membrance filter pressure reduction adjust time, the flow Q that its air washes away
iscope be shown below:
b[(Q
max-Q
0)*(p
i-p
0)/(p
max-p
0)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(p
i-p
0)/(p
max-p
0)+Q
0],
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; p
ifor the filtration pressure difference in running; p
0for the filtration pressure difference of milipore filter initial operating stage; p
maxfor the filtration pressure difference of end-of-run, b and c is that air washes away flow regulation coefficient, and b is 0.8-0.9, c is 1.1-1.2.
4. milipore filter operation method according to claim 1, is characterized in that: the air in described physical cleaning wash away flow according to implement air wash away before ultrafiltration membrance filter resistance adjust time, its air washes away flow Q
iscope be shown below:
b[(Q
max-Q
0)*(r
i-r
0)/(r
max-r
0)+Q
0]≤Q
i≤c[(Q
max-Q
0)*(r
i-r
0)/(r
max-r
0)+Q
0]，
Wherein, Q
maxfor the maximum air of milipore filter washes away flow; Q
0for the minimum air of milipore filter washes away flow; r
ifor the filtration resistance in running; r
0for the filtration resistance of milipore filter initial operating stage; r
maxfor the filtration resistance of end-of-run, b and c is that air washes away flow regulation coefficient, and b is 0.8-0.9, c is 1.1-1.2.
5. the milipore filter operation method according to any one of claim 1-4, is characterized in that: described former water is the after-treatment water of municipal sewage plant, and turbidity is 2-30NTU.
6. the milipore filter operation method according to any one of claim 1-4, is characterized in that: described physical cleaning washes away and backwash for carrying out air to milipore filter simultaneously, and the time is 30-120s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115060.8A CN104941454A (en) | 2014-03-26 | 2014-03-26 | Ultrafiltration (UF) membrane operation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115060.8A CN104941454A (en) | 2014-03-26 | 2014-03-26 | Ultrafiltration (UF) membrane operation method |
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| Publication Number | Publication Date |
|---|---|
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ID=54156840
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823820A (en) * | 2017-03-03 | 2017-06-13 | 同济大学 | A kind of integrated apparatus for obtaining metal film operation and cleaning duty parameter |
| JP2019025437A (en) * | 2017-07-31 | 2019-02-21 | 東芝インフラシステムズ株式会社 | Cleaning air volume control device and cleaning air volume control method |
-
2014
- 2014-03-26 CN CN201410115060.8A patent/CN104941454A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823820A (en) * | 2017-03-03 | 2017-06-13 | 同济大学 | A kind of integrated apparatus for obtaining metal film operation and cleaning duty parameter |
| JP2019025437A (en) * | 2017-07-31 | 2019-02-21 | 東芝インフラシステムズ株式会社 | Cleaning air volume control device and cleaning air volume control method |
| JP7000063B2 (en) | 2017-07-31 | 2022-01-19 | 東芝インフラシステムズ株式会社 | Cleaning air volume control device and cleaning air volume control method |
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