CN109201644A - A kind of NF/RO film unit water inlet line inner wall breeds the cleaning method of bacteria sludge - Google Patents
A kind of NF/RO film unit water inlet line inner wall breeds the cleaning method of bacteria sludge Download PDFInfo
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- CN109201644A CN109201644A CN201810994548.0A CN201810994548A CN109201644A CN 109201644 A CN109201644 A CN 109201644A CN 201810994548 A CN201810994548 A CN 201810994548A CN 109201644 A CN109201644 A CN 109201644A
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- water inlet
- inlet line
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
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- Mechanical Engineering (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses the cleaning methods that a kind of NF/RO film unit water inlet line inner wall breeds bacteria sludge, comprising the following steps: remaining sewage in emptying water inlet line washes with water water inlet line inner wall, until the water quality coloration of eluate is less than 10 times；Wash cycles are carried out to water inlet line inner wall and NF/RO film unit using solution of sodium bisulfite, are immersed in NF/RO membrane component in solution of sodium bisulfite；Water inlet line inner wall is impregnated using cleaning agent；Wash with water water inlet line inner wall；Wash cycles are carried out to water inlet line inner wall using medicament is neutralized, complete the cleaning for breeding bacteria sludge to NF/RO film unit water inlet line inner wall.Cleaning method of the present invention, the bacteria sludge of water inlet line inner wall growth can effectively be removed, have many advantages, such as that simple process, easy to operate, processing cost is low, cleaning efficiency is high, cleaning effect is good, can satisfy actual treatment needs, there is good application value and application prospect.
Description
Technical field
The invention belongs to technical field of sewage, and it is dirty to be related to a kind of NF/RO film unit water inlet line inner wall growth bacterium
The cleaning method of mud.
Background technique
Currently, the processing method of loading embeading percolation liquid is frequently with MBR+NF/RO technique, wherein ultrafiltration membrane elements are important compositions
Part, general ultrafiltration membrane elements service life are 3~5 years.It is right when ultrafiltration membrane elements service life was near or above 3~5 years
The cutoff performance of microorganism declines.Particularly, in actual application, it is the utilization efficiency for improving equipment, reduces production fortune
Row cost, the generally only low ultrafiltration membrane elements of replacement small part flux, and major part has been more than the ultrafiltration membrane element of service life
Part still will continue to using, or even operation 6 years after continue to using as a result, cutoff performance of the ultrafiltration membrane elements to microorganism
It is remarkably decreased, and the microbes such as bacterium enter ultrafiltration clear liquid collecting tank through the ultrafiltration membrane elements of aging.When the micro- life of appearance
When object bacterium enters ultrafiltration clear liquid collecting tank through ultrafiltration membrane elements, bacterium is clear in ultrafiltration using the organic matter of ultrafiltration clear liquid dissolution
Inside liquid collecting tank, the place such as NF/RO film unit water inlet line inner wall, filter, NF/RO film surface breed breeding, growth generation
It thanks, a large amount of bacteria sludge is attached to the surface of these components, is easy blocking water inlet line, filter, NF/RO membrane component and height
Press pump etc., so as to cause the filter bag replacement in the filter of NF/RO membrane component front end, frequent, membrane component front and back end pressure difference goes up fast
A series of problems, such as rate is fast.When especially same day temperature is higher, as summer belongs to high temperature season, and high temperature is continuously on 32 DEG C
Under, this is the optimum temperature of bacterial reproduction, and through ultrafiltration membrane elements clear liquid in content of organics 400~800mg/L it
Between, energy, while the inner surface of ultrafiltration clear liquid collecting tank, NF/RO film unit water inlet line inner wall, mistake are provided for the growth of bacterium
The place such as surface of filter and NF/RO film provides carrier for the breeding of bacterium, so that bacterial reproduction speed is fast, as a result,
The cleaning and replacement of the components such as pipeline, filter bag and NF/RO membrane component are more frequent.By statistical analysis, water inlet line inner wall and
Filter inner wall adheres to a large amount of biological bacteriums and sticks mud (bacteria sludge), and the filter bag in the filter of NF/RO membrane component front end needs daily
It replaces 4 times or more, NF and RO membrane component front and back end pressure difference was gone up with 0.8~1.3bar/ days rates.The above problem is deposited
Directly resulting in operating cost increase, processing difficulty increases, treatment effect is difficult to improve and is difficult to reach design requirement.Therefore,
Effectively cleaning NF/RO film unit water inlet line inner wall breeds bacteria sludge and has a very important significance.
Currently, the method that cleaning NF/RO film unit water inlet line inner wall breeds bacteria sludge mainly has: (1) artificial mechanism
Sweep-out method, this method need to remove in pipeline, then carry out mechanical descaling using artificial beat, but there is problems in that
Long construction period, construction personnel is more, intensity is big, low efficiency, cleaning effect are poor, larger to Influence of production, seriously affects production effect
Rate.(2) chemical agent cleaning method, this method in pipeline by manually pouring into the chemistry with sludge reaction in pipeline highest point
Chemical reaction or dissolution sludge occur for the sludge of medicament, chemical agent and inner wall of the pipe, thus achieve the effect that remove sludge,
But the problems such as there are still cleaning effect is poor, scavenging period is long in existing medicament cleaning method.In addition, according to being artificially infused to
The mode of chemical agent is cleaned, and there is problems: because the gas that air in pipeline and reaction generate is not easy to be discharged, being led
The chemical agent of cleaning is caused to pour into unsmooth, the cleaning chemical agent poured into, which easily sputters, to be come, and there are larger personal safety hidden danger, clearly
Washing between chemical agent and pipeline cannot come into full contact with, and cleaning efficiency and cleaning effect are poor.Therefore, obtain a kind of simple process,
NF/RO film unit water inlet line inner wall easy to operate, processing cost is low, cleaning efficiency is high, cleaning effect is good breeds bacteria sludge
Cleaning method, for improve MBR+NF/RO technique treatment effect and expand MBR+NF/RO technique application range have
Highly important meaning.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, a kind of simple process, easy to operate, place are provided
Manage the cleaning side that the NF/RO film unit water inlet line inner wall that at low cost, cleaning efficiency is high, cleaning effect is good breeds bacteria sludge
Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of NF/RO film unit water inlet line inner wall breeds the cleaning method of bacteria sludge, comprising the following steps:
Remaining sewage in S1, emptying water inlet line, washes with water water inlet line inner wall, until the water quality coloration of eluate
Less than 10 times；
After S2, step S1, water inlet line inner wall and NF/RO film unit are recycled using solution of sodium bisulfite
Cleaning, is immersed in NF/RO membrane component in solution of sodium bisulfite；
After S3, step S2, water inlet line inner wall is impregnated using cleaning agent；
After S4, step S3, water inlet line inner wall is washed with water；
After S5, step S4, wash cycles are carried out to water inlet line inner wall using medicament is neutralized, are completed to NF/RO film
The cleaning of unit water inlet line inner wall growth bacteria sludge.
Above-mentioned cleaning method, further improved, in the step S2, the concentration of the solution of sodium bisulfite is
8000ppm~15000ppm.
Above-mentioned cleaning method, it is further improved, in the step S3, the cleaning agent be liquor natrii hypochloritis,
One of active carbon mixed liquor, EDTA solution, non oxidizing bactericide.
Above-mentioned cleaning method, it is further improved, in the liquor natrii hypochloritis effective chlorine density be 20g/kg~
40g/kg；The pH value of the liquor natrii hypochloritis is 10.5~12.5.
Above-mentioned cleaning method, further improved, the non oxidizing bactericide is formaldehyde or glutaraldehyde.
Above-mentioned cleaning method, further improved, in the step S5, the neutralization medicament is solution of sodium bisulfite
Or reproducibility acid solution.
Above-mentioned cleaning method, it is further improved, the concentration of the solution of sodium bisulfite be 8000ppm~
15000ppm。
Above-mentioned cleaning method, further improved, the reproducibility acid solution is H2S solution, phosphite solution,
One of hypophosphites solution.
Above-mentioned cleaning method, further improved, the H2The concentration of S solution is 0.4mol/L~0.8mol/L.
Above-mentioned cleaning method, it is further improved, in the step S2, time of the wash cycles be 10min~
20min。
Above-mentioned cleaning method, it is further improved, in the step S3, it is described impregnate for by cleaning agent in pipeline
20min~40min, static soak 5min~15min are circulated, is repeated aforesaid operations 3 times~6 times.
Above-mentioned cleaning method, further improved, in the step S1, the water is middle water.
Above-mentioned cleaning method, further improved, in the step S4, the water is middle water.
Above-mentioned cleaning method, it is further improved, in the step S5, time of the wash cycles be 10min~
20min。
Compared with the prior art, the advantages of the present invention are as follows:
It (1), can the present invention provides the cleaning method that a kind of NF/RO film unit water inlet line inner wall breeds bacteria sludge
The bacteria sludge that NF/RO film unit water inlet line inner wall is bred effectively is removed, inhibits the growth of bacterium, before reducing NF/RO film
The replacement frequency of filter sock is held, operating cost is reduced, while NF/RO membrane component can be prevented by the pollution of bacterium, is improved
The service life of film and water efficiency is produced, there is simple process, easy to operate, processing cost is low, cleaning efficiency is high, cleaning effect is good etc.
Advantage can satisfy actual treatment needs, there is good application value and application prospect.
(2) in cleaning method of the present invention, NF/RO membrane component is impregnated using sodium sulfite solution, central role is played, can prevent
Only cleaning agent (such as liquor natrii hypochloritis) aoxidizes NF/RO membrane component in subsequent soaking process, to avoid cleaning agent to NF/
The damage of RO membrane component, and can be realized the effective protection to NF/RO membrane component.Sodium sulfite solution is by industry used in the present invention
Grade sodium sulfite is prepared to obtain, and has many advantages, such as that price is low, easy acquisition.
(3) in cleaning method of the present invention, NF/RO film unit water inlet line inner wall is impregnated using liquor natrii hypochloritis, it can
Quickly and effectively dissolve into pipe inner wall attachment bacteria sludge, and by control liquor natrii hypochloritis effective chlorine density,
The parameters such as pH, soaking time achieve the purpose that sterilization cleaning dirt, and can be realized pair in the case where operation cost is minimum
Effective cleaning of NF/RO film unit water inlet line, cleaning effect is preferable, this is because: if effective chlorine is dense in liquor natrii hypochloritis
Height is spent, then is likely to result in liquor natrii hypochloritis's waste, is unfavorable for reducing processing cost, and excessively high effective chlorine density can increase
Add the security risk (security risk) of liquor natrii hypochloritis during processing, and effective chlorine density mistake in liquor natrii hypochloritis
Low, then liquor natrii hypochloritis is difficult to dissolve, kills bacterium in inner wall of the pipe, so that cleaning effect is bad；If liquor natrii hypochloritis
PH it is higher, then the dosage that will increase liquid alkaline in N-process increases, cause increased costs, and liquor natrii hypochloritis pH is relatively low,
Equally also cleaning effect can be made bad；If too long when the immersion of liquor natrii hypochloritis, production capacity will be greatly reduced, be unfavorable for industry
The problems such as metaplasia produces, and soaking time is too short, bad there is also cleaning effect.In addition, liquor natrii hypochloritis used in the present invention by
Technical grade sodium hypochlorite is prepared to obtain, and has many advantages, such as that price is low, easy acquisition.
Detailed description of the invention
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.
Fig. 1 is the cleaning process flow that NF/RO film unit water inlet line inner wall breeds bacteria sludge in the embodiment of the present invention 1
Figure.
Fig. 2 is the comparative diagram of cleaning front and back NF/RO film unit water inlet line inner wall in the embodiment of the present invention 1, wherein (a) is
Before cleaning, (b) after for cleaning.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
Material employed in following embodiment and instrument are commercially available.In the embodiment of the present invention, unless otherwise noted,
Used technique is common process, and used equipment is conventional equipment.
Embodiment 1:
A kind of NF/RO film unit water inlet line inner wall breeds the cleaning method of bacteria sludge, as shown in Figure 1, including following
Step:
S1, pre-treatment.Remaining sewage in water inlet line is emptied, water (reverse osmosis membrane system water outlet) rinses water inlet pipe in
Road inner wall cleans inner wall of the pipe, until the water quality coloration of eluate less than 10 times, stops rinsing.
S2, membrane component protective program.After step S1, the solution of sodium bisulfite that concentration is 10000ppm is placed in super
In cleaner liquid collecting tank, wash cycles program is opened, wash cycles 15min is carried out to water inlet line inner wall and NF/RO film unit,
It is immersed in NF/RO membrane component in solution of sodium bisulfite simultaneously, prevents subsequent liquor natrii hypochloritis from aoxidizing membrane component.
S3, soaking sterilization.After step S2, the sodium hypochlorite that effective chlorine density is 11.8 for 25g/kg, pH value is used
Solution carries out soak at room temperature to 11 inner wall of water inlet line, specifically: liquor natrii hypochloritis is transported in water inlet line using pump,
Make full of liquor natrii hypochloritis in pipeline, while making liquor natrii hypochloritis in pipeline internal circulation flow 30min, static leaching using pump
10min is steeped, is repeated aforesaid operations 5 times.In the process, it is pressurizeed due to pump to cleaning agent, increases the kinetic energy of cleaning agent,
Enter effective component in the cleaning agent after washing in pipeline at this time to increase in pipeline with bacteria sludge collision frequency, small molecule object
Matter operating rate is accelerated, and effective contact area increases, and cleaning agent becomes faster with bacteria sludge reaction rate, and bacterium can be promoted dirty
Mud occurs chemical reaction with chemical agent or is mutually dissolved, and finally reduces the time that chemical agent impregnates pipeline, improves cleaning
Efficiency and cleaning quality.In the step, related valve is controlled, prevents liquor natrii hypochloritis from leaking.
S4, water clean pipeline.After step S3, water (reverse osmosis membrane system water outlet) rinses water inlet line inner wall in
Inner wall of the pipe is cleaned, to achieve the purpose that the liquor natrii hypochloritis's (cleaning agent) cleaned in pipeline, until eluate
Middle chlorinty is less than 0.1ppm, stops rinsing.
S5, medicament cleaning pipe road is neutralized.After step S4, by concentration be 10000ppm (be not limited to the concentration, other
Concentration also can, as concentration be 8000ppm~15000ppm) solution of sodium bisulfite be placed in ultrafiltration clear liquid collecting tank,
Wash cycles program is opened, wash cycles 15min is carried out to water inlet line inner wall, rinses water inlet pipe using solution of sodium bisulfite
Remaining liquor natrii hypochloritis in road, to achieve the purpose that clean the remaining liquor natrii hypochloritis of inner wall of the pipe (cleaning agent),
Complete the cleaning that bacteria sludge is bred to NF/RO film unit water inlet line inner wall.
S6, booting.It after step S5, opens and produces water program, operate normally booting.
In the present embodiment, intend the corresponding NF/RO film unit of cleaning water inlet line, as shown in Tables 1 and 2, wherein NF/RO film machine
Group is nanofiltration/reverse osmosis integrated equipment, is connected to ultrafiltration clear liquid collecting tank by water inlet line.
Fig. 2 is the comparative diagram of cleaning front and back NF/RO film unit water inlet line inner wall in the embodiment of the present invention 1, wherein (a) is
Before cleaning, (b) after for cleaning.As shown in Figure 2, before cleaning, NF/RO film unit water inlet line inner wall, filter inner wall are attached with
A large amount of bacteria sludge, and after the method for the present invention is cleaned, NF/RO film unit water inlet line inner wall, filter inner wall adhere to
Most of bacteria sludge has been dissolved, and does not have particle-bound bacteria sludge substantially, and cleaning effect is preferable, this explanation uses present invention side
Method can clean up the bacteria sludge that NF/RO film unit water inlet line inner wall is bred.
In order to further verify beneficial effect brought by the method for the present invention, the filter sock forward and backward to pipeline cleaning
Replacing construction is counted, and the results are shown in Table 1.
1 difference NF/RO film unit water inlet line of table cleaning front and back filter bag replaces situation statistical form
Remarks: the time is during in June, 2018 on table
As shown in Table 1, it does not clean NF/RO film unit (A2 and A3), filter bag high frequency of replacement, wherein filter bag is more in A2
It changes frequency and is up to 4 times/day, the replacement frequency of filter bag is up to 4 times/day in A3.And filter in NF/RO film unit (A1 and A3) after cleaning
The replacement frequency of bag is down to 1 times/day.By comparing it is found that being filtered in NF/RO film unit after cleaning method of the present invention cleaning
Bag replacement frequency significantly reduces, this advantageously reduces operating cost and processing difficulty.
In order to further verify beneficial effect brought by the method for the present invention, pipeline cleaning is forward and backward to NF/RO film unit
(A1) film pressure at two ends is counted in, and the results are shown in Table 2.In table 2, film in NF/RO film unit (A1) before and after pipeline cleaning
Pressure at two ends data test obtain under the same test conditions.
Influence experimental data of the cleaning of table 2 front and back to NF, RO film operating pressure
Remarks: in table 2, experimental group is the NF/RO film unit after cleaning, and control group is unwashed NF/RO film unit.
As shown in Table 2, in unwashed NF/RO film unit (control group), NF1, RO2And 2RO2Accumulation days running point
Wei not be 4 days, 8 days and 5 days, and in the NF/RO film unit (experimental group) cleaned, NF1, RO2And 2RO2Accumulation days running difference
It is 6 days, 7 days and 7 days.By comparing it is found that being cleaned compared to the NF/RO film unit not cleaned through cleaning method of the present invention
The accumulation days running of NF/RO film unit afterwards is generally longer, and Cumulative Elapsed Time is relatively stable, this advantageously reduces operation
Cost and processing difficulty.In addition, as shown in Table 2, pressure at two ends rise value is up in 4.01bar or more, increase rate in control group
1.26bar/ days, wherein NF1, RO2And 2RO2Pressure at two ends rise value be respectively 4.28bar, 10.13bar, 4.01bar, on
The rate of rising is respectively 1.070bar/ days, 1.26bar/ days, 0.802bar/ days；And pressure at two ends rise value exists in experimental group
1.47bar hereinafter, increase rate down to 0.21bar/ days, wherein NF1, RO2And 2RO2Pressure at two ends rise value be respectively
1.19bar, 1.47bar, 0.85bar, increase rate are respectively 0.198bar/ days, 0.210bar/ days, 0.121bar/ days.As it can be seen that
Compared to the NF/RO film unit not cleaned, after cleaning method of the present invention cleaning, each film both ends (front and back in NF/RO film unit
End) pressure rise value lower and both ends (front and back end) pressure increase rate it is relatively low, this advantageously reduces processing difficulty and raising
Treatment effect, so as to more easily reach design requirement.
Result in complex chart 2, Tables 1 and 2 is it is found that cleaning method of the present invention can effectively remove NF/RO film unit
The bacteria sludge that water inlet line inner wall is bred inhibits the growth of bacterium, reduces the replacement frequency of NF/RO film front end filter sock
Rate reduces operating cost, while can prevent NF/RO membrane component by the pollution of bacterium, improves the service life of film and produces water effect
Rate has many advantages, such as that simple process, easy to operate, processing cost is low, cleaning efficiency is high, cleaning effect is good, can satisfy practical place
Reason needs, and has good application value and application prospect.
Above embodiments are only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned reality
Apply example.All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It is noted that being led for this technology
For the those of ordinary skill in domain, improvements and modifications without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. the cleaning method that a kind of NF/RO film unit water inlet line inner wall breeds bacteria sludge, which is characterized in that including following step
It is rapid:
Remaining sewage in S1, emptying water inlet line, washes with water water inlet line inner wall, until the water quality coloration of eluate is less than
10 times；
After S2, step S1, circulation cleaning is carried out to water inlet line inner wall and NF/RO film unit using solution of sodium bisulfite
It washes, is immersed in NF/RO membrane component in solution of sodium bisulfite；
After S3, step S2, water inlet line inner wall is impregnated using cleaning agent；
After S4, step S3, water inlet line inner wall is washed with water；
After S5, step S4, wash cycles are carried out to water inlet line inner wall using medicament is neutralized, are completed to NF/RO film unit
The cleaning of water inlet line inner wall growth bacteria sludge.
2. cleaning method according to claim 1, which is characterized in that in the step S2, the solution of sodium bisulfite
Concentration be 8000ppm~15000ppm.
3. cleaning method according to claim 1, which is characterized in that in the step S3, the cleaning agent is time chlorine
One of acid sodium solution, active carbon mixed liquor, EDTA solution, non oxidizing bactericide.
4. cleaning method according to claim 3, which is characterized in that effective chlorine density is in the liquor natrii hypochloritis
20g/kg~40g/kg；The pH value of the liquor natrii hypochloritis is 10.5~12.5；The non oxidizing bactericide be formaldehyde or
Glutaraldehyde.
5. cleaning method according to claim 1, which is characterized in that in the step S5, the neutralization medicament is sulfurous
Sour hydrogen sodium solution or reproducibility acid solution；The reproducibility acid solution is H2S solution, phosphite solution, hypophosphites
One of solution.
6. cleaning method according to claim 5, which is characterized in that the concentration of the solution of sodium bisulfite is
8000ppm~15000ppm；The H2The concentration of S solution is 0.4mol/L~0.8mol/L.
7. cleaning method described according to claim 1~any one of 6, which is characterized in that in the step S2, the circulation
The time of cleaning is 10min~20min.
8. cleaning method described according to claim 1~any one of 6, which is characterized in that in the step S3, the immersion
For cleaning agent in pipeline internal circulation flow 20min~40min, static soak 5min~15min, is repeated aforesaid operations 3 times
~6 times.
9. cleaning method described according to claim 1~any one of 6, which is characterized in that described in the step S1 and S4
Water is middle water.
10. cleaning method described according to claim 1~any one of 6, which is characterized in that described to follow in the step S5
The time of ring cleaning is 10min~20min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994548.0A CN109201644B (en) | 2018-08-29 | 2018-08-29 | Cleaning method for bacterial sludge breeding on inner wall of water inlet pipeline of NF/RO membrane unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810994548.0A CN109201644B (en) | 2018-08-29 | 2018-08-29 | Cleaning method for bacterial sludge breeding on inner wall of water inlet pipeline of NF/RO membrane unit |
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| CN109201644B CN109201644B (en) | 2021-11-12 |
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